For those in the rock crushing industry, you know that not one size fits all: each state has different��regulations,��each quarry has different challenges, each site has��different set��ups.  ��

It can be overwhelming to talk to��dozens��of��different sales representatives��before you can get an idea of how the equipment would fit in with your environment.��That’s��why��it’s��important to work with a company that is experienced with developing rock crushing equipment configured��specifically for you��to achieve your end goals.  ��

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Creating Your Ideal Setup  ��

91������ specializes in ensuring your crushing and screening equipment is designed exactly for your specific needs.��

While Eagle offers an array of standard and off-the-shelf crushing and screening equipment,��nearly everything��can be reconfigured to ensure��you’re��crushing most efficiently.����

From small customizations, like ensuring your Eagle crushing equipment matches your current crushing and screening��spread color scheme, or just matching your favorite sports team colors, to more complex reconfigurations like altering a portable plant’s return conveyor to a different side when small sites necessitate a certain material flow.����

91������’s Stationary MaxRAP® System in a custom color scheme.

91������ has��that experience��and��expertise��at your disposal. Choosing the right manufacturer, with team members who care and listen to your needs, can make or break a custom rock crushing setup. ��

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Creating Custom Rock Crushing Equipment with 91������ ��

Together with 91������’s on-site engineering team, you can create the setup that fits your specific specifications, such as the type and size of input materials. With the specifications, the engineering team will look at the catalog of 91������’s current standard, customized, and special build items to come up with an efficient way to get the end results you are wanting to achieve whether through a new system or by incorporating the equipment into your existing process. ��

The 1600X-OC was a custom build, due to a customer’s need for a larger feed opening than what at the time was the largest 91������ impactor, the Ultramax® 69. Now, it is offered and a standard plant that many producers choose when building a high-output crushing system.��

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Start Your Custom Rock Crushing Equipment Journey Today ��

Reach out to either your local, authorized dealer or reach out directly to 91������ to start your��unique crushing��journey. Whether you are starting out in the rock crushing industry or��just in need of something specific, 91������ is ready to be hands-on and find the perfect fit for you.  ��

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When it comes to preventative maintenance and routine maintenance on your rock crushing equipment, the thought process immediately goes to the fluids, the belts, the wear plates, and more. One area that is often missed after the initial set up is the leveling of your equipment. While it may not seem like an important factor, an unlevel plant can be the catalyst of a list of issues such as belts not tracking properly, oil levels in the screen and feeder being uneven, improper flow of material into the impactor, and more. In this “Service Questions”, 91������ Service Technician Louis will go over the when’s and the how’s of leveling portable rock crushing equipment.

When to Check the Level of Your Portable Rock Crushing Equipment

Ideally you will want to place your plant on level ground, such as a concrete pad, to prevent any equipment from sinking. Placing your rock crushing equipment on level ground removes the need to check the leveling or your rock crushing equipment on a frequent basis. While having your equipment on level ground is a great start to minimizing your equipment becoming unlevel, it is still imperative to keep checking the level even if it’s just monthly.

If you are unable to put your portable rock crushing equipment on level ground, it’s important to check the leveling of your rock crushing equipment on a bi-weekly basis. If you are using cribbing, wood planks or concrete blocks, to level your plant, you should still check the leveling of your equipment on a bi-weekly basis. While it is still better than being on direct and uneven ground, cribbing still has the potential to sink and make the equipment unlevel. Checking the leveling of your portable rock crushing equipment will ensure that you are able to correct any leveling issues that may cause larger issues if unattended.

How to Level Your Rock Crushing Equipment

Using a level, check the level both laterally (side-to-side) and longitudinally (front-to-back). DO NOT make adjustments to the lifting legs at this time.

Lateral Leveling: When checking the front, check the level at the top of the screen, and when checking the back, check the level on the bottom of the feeder drive oil reservoir.

Longitudinal Leveling: Check the level in various places along the main frame on both sides of the plant.

Keeping Your Preventative Maintenance on Level

Knowing you are not alone in your rock crushing journey is the biggest challenge you can overcome. Not only does 91������ offer 24/7 emergency service calls, but they have a network of authorized dealers that are available to you. Keeping your preventative maintenance on level will keep you up and crushing it and can help mitigate unnecessary downtime.

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The flow of material like aggregate and demolition waste through portable crusher plants can be controlled by several components on the machine. Some of these parts are mechanical in nature, like the conveyors, while others, like impactor safety curtains, are comparatively simple—but still effective in their purpose.

Despite appearing less important than their more mechanical counterparts, regularly assessing and maintaining the safety curtains of a portable crusher plant is just as valuable as servicing more intricate components. After all, operating an efficient and safe crusher requires tending to the smaller details that protect both equipment and personnel.

What Are Impactor Safety Curtains?

Impactor safety curtains are usually located within the feed opening between the hopper and the impact crusher. They can exist in a variety of forms and configurations and most regularly consist of loosely hanging rubber flaps or rows of stainless-steel chains.

These seemingly simple components play a critical role in impact crusher safety, protecting both your equipment and your crew from preventable hazards.

Generally, these curtains are installed to serve a dual purpose that addresses both operational efficiency and worker safety:

Purpose 1: Control Material Flow

The first purpose is to physically slow the rate of material being fed into the impact crusher, ensuring that the machine does not become oversaturated with aggregate. This controlled flow:

• Prevents overloading the crusher chamber
• Reduces unnecessary wear on blow bars and rotor components
• Maintains optimal crushing efficiency
• Extends the lifespan of critical wear parts

By regulating material entry, safety curtains help maintain consistent production rates while protecting expensive crusher components from premature wear.

Purpose 2: Prevent Material Ejection

The other purpose for safety curtains is to serve as a safeguard against material being ejected back out of the impactor into the job site. Because the impactor’s rotor spins at extremely high speeds—often 600-1200 RPM—when it contacts the material being processed, it can create dangerous projectiles.

Without proper curtains in place, rocks and debris can be thrown back through the feed opening at high velocity, creating serious injury risks for:

• Equipment operators
• Ground personnel
• Anyone working near the crusher

This projectile protection is a fundamental aspect of crusher safety that cannot be overlooked.

Recognizing Worn or Damaged Impactor Safety Curtains

Over time, material flowing past the impactor safety curtains can wear them down, leading to damaged or broken curtains that create gaps and reduce their effectiveness. Common signs of curtain wear include:

Physical Damage:

• Torn or ripped rubber flaps
• Broken or missing chain links
• Holes or gaps in the curtain barrier
• Frayed edges or thinning material

Performance Issues:

• Material flowing into the impactor more quickly than normal
• Visible gaps allowing light through the feed opening
• Increased dust escaping from the feed area
• Material or debris ejecting from the crusher

Damaged or worn safety curtains create increased equipment wear, which can lead to reduced crushing efficiency, lower production rates, and more frequent maintenance (not to mention higher operating costs).

Increased wear can also create damaged curtains and gaps, which create opportunities for dangerous projectiles to escape the crusher, putting team members at risk of serious injury. These avoidable risks make regular curtain inspection and maintenance essential.

Maintaining Safety Curtains for Your Impactor

Due to these preventable risks, it’s crucial to regularly assess and maintain the condition of your impactor safety curtains by:

• Checking curtain condition daily during pre-operation inspections for tears, gaps, broken chains, or worn areas
• Verifying curtains hang properly and cover the full feed opening
• Inspecting mounting hardware for security
• Replacing damaged curtains immediately—don’t wait for complete failure
• Keeping spare curtains on hand to minimize downtime
• Ordering genuine replacement parts designed for your specific crusher model
• Ensuring curtains are installed according to manufacturer specifications
• Verifying proper overlap and coverage with secure mounting to prevent shifting
• Testing curtain movement to ensure they function as intended
• Documenting replacement dates to track curtain lifespan

Protecting Equipment and Personnel Through Proper Maintenance

Questions about the safety curtains on your portable crusher plant? Need to replace your safety curtains? Contact our service or parts departments to speak with a Team Eagle representative. Our experts can help you identify the correct replacement curtains, assess your curtain condition, provide installation guidance, and source the proper parts.

Important Disclaimer: This article does not serve as an official safety recommendation by 91������ and should not be viewed as such. All relevant staff should consult their owner’s manual before operating 91������ equipment, or any other manufacturer’s equipment, and comply with the safety guidelines therein.

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While 91������’s Service Team has been sharing advice and tackling frequently asked questions regarding rock crushing equipment, there is a lot more to what they can do to keep you up and crushing. When you purchase or rent heavy equipment, you want to be certain that the team behind the equipment will be there to help you throughout your journey. From setup to unexpected down times, it’s important to know who you can trust with your invaluable time. Not only does 91������ have a large network of authorized dealers, but a team of knowledgeable and proactive Service Technicians. Other than sharing their knowledge in monthly blogs, what does the 91������ Service Team do?

Setting Up & Starting Up

As soon as your equipment is delivered, 91������’s Service Technicians are there ready to help set up. From supervising installation, to turning the wrenches themselves, the Service Technicians are there to assist in setting up your site. While preparations, such as concrete pads and cribbing, should be done prior to set up, the service team is also there to help with site recommendations to ensure your crusher won’t have unexpected downtimes due to site issues.

While on site, you can tap into their vast knowledge of the equipment so that when you are ready to go, you will be even more familiar with your crusher. The Service Team is there to assist in every aspect of setting up to make sure that the startup goes smoothly.

After startup, the 91������ Service Team helps you readjust the necessary items, such as belts, so that the equipment is ready to start crushing it.

Portable Crusher Service Trainings

Not only does 91������’s Service Team provide monthly training in their Service Questions, but they also provide in-person training. Whether you want to do the training at 91������’s headquarters and manufacturing facility, or on your own site with your own equipment, 91������’s Service Team is available to provide personalized training that covers topics from preventative maintenance to plant-specific needs.

If you’re interested in training your team, reach out to Service@EagleCrusher.com for more information.

Immediate Portable Crusher Service Response

When it comes to portable crusher service, sometimes you have questions that come up that you need answers to right away. Although the owner’s manuals are always available to you, there might not be the time to step away and find the answer. That’s where 91������’s Service Team comes into play. If you need in-person assistance, the network of authorized dealers are there to answer questions and visit on site if necessary. If a question comes up that requires immediate answers to prevent unnecessary downtime, you always have 91������’s Service Team an email, or a phone call away.

Trusting the Portable Crushing Service if There for You

We know that portable crushing equipment is a big investment, so we want you to feel comfortable in your journey by providing various Eagle teams, but especially 91������’s Service Team. While 91������ has a fantastic Parts Team, Shipping Team, Transportation Team, and more, the team that will support you in all aspects of your portable crushing task is the Service Team and they are ready to be there for you.

Once you buy 91������ equipment, you become part of the family and family has your back, no matter what.

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When running into issues with your crusher, you primarily look towards conveyors, belts, wear plates, and other larger components in your machine. But what about the electrical side of the machinery? As a Service Technician, you hear a lot of questions regarding machinery, so 91������ Service Technician Dakota will cover various portable crusher electrical troubleshooting options. As always, if you’re looking for more information regarding the electrical components in your machine, please refer to your owner’s manual. Always apply safety practices such as lock out / tag out and referring to licensed electricians when local/state/provincial/federal law requires.

When I energize the panel, nothing happens. Why?

We often get phone calls regarding this question, and the conversation usually starts the same every time, “Hi, I went to turn the panel on and when I did there was no lights or horns going off.”

This scenario’s answer is often as simple as a loose wire or a stuck relay contact on the back of an E-stop button or the back of an all-motor stop button. The control voltage must make it through the E-stops and all motor stops before any lights are illuminated or horns will sound. Sometimes debris such as dust builds up holding a normally closed (NC) contact open and creating an open circuit condition. All you need to do is clean the circuit and ensure the circuit is closed.

Why is my VFD faulting with an overcurrent fault on startup?

Most of the time, the answer is that the acceleration time is not long enough to get up to speed under load. The acceleration time should be set at 6 seconds to give it enough time to get up to speed without drawing excessive current causing the fault.

Why does the Controls Inc. panel on the diesel drive read “ECU Comms Lost”?

The code “ECU Comms Lost” is an E-stop condition. Check the E-stop buttons to make sure one is not pressed in or that the contact on the back of the e-stop button is not stuck in an open condition. The relay in the Controls Inc. panel can also trigger this code if it has failed.

Why is my return conveyor shutting off and everything after it?

This condition is often caused by a voltage drop, more specifically when the belts slip on the generator. When the belts slip, the RPMs decrease at the generator, causing a decrease in voltage output from the generator.

This could also occur if the return conveyor has a VFD and the VFD faults, stopping the conveyor and everything behind it. This is because the control panels are designed with an electromechanical interlock to ensure a correct operational sequence. If it is faulting, be sure to correct what is causing the fault, whether it be excessive build-up, something stuck in the tail pulley, or failing components putting strain on the motor.

Why am I not getting 480 VAC to the control panel?

This question is geared towards whether you have a generator on the plant rather than line power. If your control panel is connected to line power and you don’t have 480 VAC there is an issue with your line power.

For generator issues, the first thing you need to do is make sure the engine RPM is at least 1800. Some generators don’t have automatic voltage regulators (AVR’s), so the generator relies on that engine RPM to be at 1800. The generators with AVRs can be adjusted via the voltage dial to get it right at 480 VAC.

Another thing that could prevent you from having the correct voltage at the panel if your belts are loose and are slipping. If that is the cause, please refer to the previous question.

Knowing Where to Get the Information You Need for Portable Crusher Electrical Troubleshooting

The most important thing to know when it comes to rock crusher maintenance is where to find the information you need for your portable crusher electrical troubleshooting needs, and more. Not only do you have an owner’s manual with plant specific information, but as an 91������ user, you are part of a wide network of authorized dealers that are local and available to help you along your journey. Additionally, 91������’s team of Service Technicians are available to answer any questions you may have that haven’t already been answered in previous Service Questions.

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This “Service Questions” is about a specific part of your crusher system and while it may seem like a small part, it can have large issues if it’s not taken care of properly. A sheave is a grooved pulley or wheel that is used to guide conveyor belts that handle heavy loads such as aggregate, concrete, and asphalt. Maintaining your sheaves and belts, by checking them daily, can help with daily production by eliminating unnecessary downtime. 91������ Service Technician, Mark, will go over some tips and tricks to maintaining your sheaves and belts.

Sheave Preventative Maintenance Routine

If a belt can’t grip the sheave properly, you will have a loss of RPMs that are required to do a specific function.�� In the case of a generator bult, it may not produce your full voltage that is required to operate your crusher. It’s important that you check your sheaves using the appropriate tools.

You’ll want to check that your sheaves are flush with the appropriate gauge. If the gauge is not flush with the sheave’s ridges, it is worn down and will cause belt slippage.

Of note, the crushing of asphalt can create significant amounts of dust which can lead to premature wear on your sheaves.

If you’re looking for sheave gauges, new sheaves, or new belts, reach out to 91������’s parts team or your authorized local dealer.

Belt slippage from worn sheaves or improper tension can result in sheaves not rotating at the expected speed.�� Depending on the diameters of the sheaves they may rotate at different RPMs in the system.���� The way to check this is by applying reflective tape on all your sheaves and watching them run. Check your sheave RPMs with a Photo Tach. For example, if the engine is running 1800 RPMs your sheave on the motor should also be spinning 1800 RPMs and the driven sheave will spin at an RPM determined by the diameter ratio. While the crusher is running, assure that all sheaves are spinning without unexpected differences in speeds.

If the sheaves are not spinning at the expected speed as the engine, you need to check the belt tension.�� See owner’s manual for tensioning process.

Belts Preventative Maintenance Routine

Belts and sheaves can also be worn and not have proper contact surfaces for power transmission. The drive belts and sheave gauges that can determine the amount of wear.

The belts and sheaves are labeled with the size designation.�� When you put in a belt gauge you can determine if the belt and sheave is worn beyond its wear limit. For an example using the image below, note that the belt shown is marked with a “B” so the belt should land on gauge line B. If your belt does not match up with the gauge, then you’ll need to replace the belt.

Getting the Right Parts

If you need to replace any parts that are worn, such as sheaves and belts, you can reach out to 91������’s Parts Team or any authorized dealer for assistance. Always refer to your owner’s manual for information that’s specific to your machine and practice maintenance safety by using the lock out / tag out method. 91������ is with you every step of the way, from start up to preventative maintenance and beyond.

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As we saw in 91������ Service Manager John’s recent Service Questions, a common area on rock crushing equipment that leads to constant questions is the conveyors. From conveyor belts not staying aligned to head pulley slippage, there are various items on the conveyors that require preventative maintenance and routine checks. Service Technician, Dakota, will run through the various questions that come from conveyor maintenance.

Conveyor Maintenance at a Glance

Common issues with conveyors involve the belt. For this Service Question, we will focus on the conveyor belt itself and not the motors or bearings involved in the pulleys. A common issue is the conveyor belt not staying centered. This can be caused by:

• Uneven Loading
  • To fix this, you should adjust the loading to be more even by dumping from a chute to the center of the conveyor belt.
• Worn or Misaligned Components (Pulleys, Idlers)
  • Check for worn or misaligned components by inspecting all pulleys and idlers to ensure they are free of any built-up material and ensure that the pulleys and idlers are properly aligned.
• Incorrect Tension or a Crooked Belt Splice

��How often should conveyor belts be inspected or spliced?

Conveyor belts should be inspected daily to ensure the health and performance of the conveyor. You should be looking for various types of conveyor belt damage, such as cuts, frays, cracks, and wear. Make sure to clean off any debris buildup on the belt, pulleys, and rollers. Also, do a visual inspection to see if the conveyor belt is tracking straight and the splice is in good condition. Listen for unusual noises while in operation, such as grinding or squeaking, which could be misaligned or failing components.

How do I set proper belt tension?

Put marks on the nontensioned belt at exactly 1000 mm from the splice. The marking must be done on the left and right side of the conveyor belt. Tension the belt and let it turn a few times to equally divide the tension. Then, measure the elongation and adjust the belt tension if necessary. See your owner’s manual for the recommended elongation of the conveyor belts.

What is causing slippage at the head pulley?

To drive a conveyor belt without slippage, and to track it in a proper way, a certain tension of the conveyor belt is necessary. See your owner’s manual for the recommended tension.

Built up materials such as fines material will increase the friction between the conveyor belt and the head pulley, so it is very important to clean your conveyor properly. If slippage continues the belt could damage the lagging of the head pulley by rubbing it smooth, causing it to struggle to grip the conveyor belt.

An example of a head pulley that is missing half the lagging.

How can I reduce material buildup under the conveyor belt?

You can reduce the buildup under a conveyor belt by ensuring the belt flashing or skirting is in good condition and making good contact with the conveyor belt. The skirting is adjustable by clamp plates. To adjust the skirting to avoid gaps in the flashing, simply loosen the clamp plates and pull the skirting down. If you can no longer pull the skirting down, you need to order new belt skirting.

After you have made sure your belt skirting is adjusted properly, inspect your belt scrapers and ensure they are making good. If the belt scrapers are not making good contact, adjust the scraper toward the belt by loosening the tensioner retainer screw and put tension on the scraper. You can do that by using a wrench to build tension, then tightening the retainer screw back down.

Don’t Let the Tension Get to You – Reach Out!

As you already know, a simple-looking part in rock crushing equipment doesn’t always mean it’s immune to preventative maintenance. What is simple is knowing the resources available to you. Not only do you have your owner’s manual, but you have a network of authorized dealers, a team of 91������ parts experts, and 91������ Service Technicians ready to help keep your tension to a minimum.

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Now that Spring is officially here, that means warmer temperatures to help with the startup of the plants that were��hibernating��over the winter.��Let’s��get you��up and��crushing��it by looking over some of the following��recommendations for your��plant prior to starting up.����

The following recommendations assume that you followed the��appropriate procedures��to shut down the equipment. If you are unaware of the��shutdown��procedures, please check out��this blog.��

Your service manuals and vendor books have more detailed information and some of the following information may not apply to your equipment. If you have more questions regarding your specific equipment, reach out to our service team.��

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Starting Up Feeder Drives and Screens��

Different types��of feeder drives, such as Simplicity and Diester, may have different specific instructions. If you are not sure of the��appropriate start-up��procedures, refer to your service manuals, vendor books, or reach out for specific information on your plant.��

Prior to placing the Deister vibrating feeder drive and screen back into operation, drain oil from the mechanism tube and refill with the correct type and amount of oil.��

To place��a simplicity vibrating��feeder��drive��and screen��back in operation, remove plugs, re-install the vents, run for��40 hours,��then change the oil.��

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Torque-Arm Speed Reducers��

If you��drained��the oil due to your equipment being inactive for a period of 3 months or more, replace the oil with a vapor��phase��corrosion inhibiting oil.��

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Starting Up Gasoline-Powered Hydraulic Unit��

When you start up your��equipment��the valves will open and close normally as the engine is starting.��It’s��recommended that you change the oil if you did not do it prior to shutting off.����

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Starting Up Diesel Engines��

Each engine manufacturer (e.g.��John Deere, CAT, etc.) has different procedures for their engine. See the engine manual shipped with the original purchase of the equipment for the proper procedure.��

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Spring to your machine’s start up procedure.��

Following the above recommendations, and any recommendations found in your owner’s manual, you should be up and crushing it in no time. Don’t forget to order any spare parts you might need throughout your crushing journey. While it might not seem like an important step in your start up procedure, it could help you save downtime. Reach out to an 91������ Parts Expert to see what parts are recommended that you have on hand.��

If you have questions about other parts of your machine, reach out today. Our��authorized��dealers��and��service representatives��are ready to��assist��you to get you up and running appropriately.����

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Different material processing jobs present unique challenges, and with the current world market, buying the right crushing equipment is critical to keeping your company up and crushing. One of the first questions people often ask about crushing equipment is whether they should buy a portable rock crusher or a mobile one.

Although these styles of rock crusher plants may appear similar, their distinctions could impact the profitability of your business and deserve a closer look. Here, we explore the key differences between mobile and portable rock crushers, helping you determine which type best suits your specific crushing needs.

Comparing Mobile vs. Portable Rock Crushers: At a Glance

Mobile Rock Crushers

Mobile rock crushers are specialized equipment used in mining and construction industries to break down large rocks into smaller pieces. Here’s an overview of mobile rock crusher advantages and disadvantages:

Pros:

• Self-propelled design significantly reduces time and labor required to move machines between job sites
• Track-based mobility allows navigation of difficult terrain that wheeled units struggle with

Cons:

• Complex mobile plants (especially those with screens on discharge conveyors) often require partial disassembly before relocation
• Compact design results in minimal clearance, making maintenance and servicing difficult
• Compromised distance between crusher discharge and plant belt
• Limited space and smaller feed hoppers compared to portable plants lead to reduced production capacity
• Transportation challenges may require specialized trailers or multiple loads for larger units

—

Portable Rock Crushers

Portable rock crushers offer an alternative to mobile units with their own set of advantages and limitations. Here’s what you should know about portable rock crusher benefits and drawbacks:

Pros:

• Superior production capacity generates higher volume of end products than comparable mobile plants
• Maximized space design allows steel and large-volume materials to pass efficiently onto the plant discharge belt
• Open design facilitates easier maintenance, reducing downtime
• Versatile screening capabilities–can feature two or three-deck screens to produce multiple products simultaneously

Cons:

• Generally require tractors for movement around job sites
• Larger portable plants typically need partial disassembly for transport (hopper feeder, magnet, etc., may need separate trailers)
• Some specialized models like RapiDeploy® plants are available as single-pull units

Frequently Asked Questions About Mobile vs. Portable Rock Crushers

What are the main differences between mobile and portable rock crushers?

Mobile crushers are self-propelled and can move around the job site, while portable crushers require towing for transportation.

Which type is better for frequently changing job sites?

Mobile rock crushers are generally better suited for projects that require frequent relocation due to their self-propelled nature and quick setup time.

Are portable crushers less efficient than mobile crushers?

Not necessarily. Portable crushers can be just as efficient and sometimes offer larger capacities, making them ideal for longer-term projects.

Can both types of crushers handle the same materials?

Yes, both mobile and portable crushers can process a wide range of materials, including rock, concrete, and asphalt, depending on the specific model and configuration.

How do I choose between a mobile and a portable rock crusher?

Consider factors such as the frequency of relocation, project duration, site conditions, and required capacity. Consult with a crushing equipment expert to determine the best option for your specific needs.

Find the Right Rock Crusher with 91������

When it comes to mobile vs. portable rock crushers, it’s crucial to consider your business needs and applications to select the right one. Ready to find the perfect mobile or portable rock crusher for your project? Contact 91������ today, or an authorized dealer, for expert advice and a free consultation. We’re here to answer your questions and help you find the best equipment for your site!

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It’s been a year since John stepped into the role of Service Manager. Throughout this time, he has established relationships with various authorized dealers and customers by answering their burning crusher questions. While answering these questions, he noticed several questions were recurring. To celebrate his first year as Service Manager, join John as he answers the top five frequently asked questions he’s received.

1. Why is my clutch fusible plug leaking fluid?
   • Your impactor may be getting overloaded and therefore overheating the clutch. The plug has a solder compound in it so that if the fluid in the clutch gets too hot, the fluid will leak out. This is done to prevent overheating and the possibly of causing permanent damage to the clutch.
   • Another solution would be to learn the proper flow of material for your machine to avoid overloading your impactor. Overloading your impactor causes a variety of issues, so it’s important to start with good practice to avoid any unnecessary downtime.

An example of good material flow.

2. Why isn’t my machine running evenly? Why are my conveyor belts wearing unevenly?
   • One of smallest differences that can cause significant issues in your machine is your machine not being level. If your machine is not level, it will cause material to shift and not run evenly through the plant. This can lead to belts leaking materials, flashings being worn out, wear plates and blow bars wearing unevenly and will affect the performance of the feeder and screen.

3. Why is there a gap in the flashing?
   • Flashing is adjusted to the belts when the unit is built and tested in the factory. Once material is on the belts, they have weight added onto them, causing the belt to sag. That is why you see gaps between the belts and flashing. After your first couple of runs, the skirtboard clamps will need to be loosened, and the flashing adjusted accordingly.

4. Why did my feeder shut off, and my code says low voltage? Is it because there’s too much material on my screen?
   • When it comes to the feeder shutting off, most of the time the drive belt just needs to be tightened or replaced. If the drive belt looks to be good, a worn-out drive sheave could also cause a low voltage code.
   • When it comes to the level of material on your screen and feed issues, it’s important to adjust the feeder belt speed to accommodate the screen. Once the machine is up and crushing, watch the material flow on the belts and screen. If there seems to be a small amount of material on the belts and the screen isn’t loaded, you can turn the feeder up to feed more material to the impactor. On the other hand, if the belts look overloaded and screen is backing up or getting material over the sides turn the feeder down to decrease the flow.

5. Why does one blow bar have more material above the locking rod pocket when I pull them to flip?
   • If there is extra material in the pocket, it might have been from the wedge being loose. When replacing the blow bars, you need to tighten the wedge screws in each wedge. When flipping or replacing the blow bars, do not torque and insert set screw and glue at first. Once everything is properly set, and the lid is properly closed, turn on the crusher and let it get up to speed. Doing this allows the blow bars to “seat” or pull out as far as they can against the locking rod. If the bar moves when the impactor is started, you may hear a loud bang. That is the bar moving into place as the rotor gets up to speed. After it has been run at full speed for a little bit, follow the proper lock out / tag out procedures prior to opening the lid again. At this point, retighten the wedge bots and torque to the recommended setting.
   • As a side note, when you insert the set screws, you can insert a small amount of paper towel to help keep the hex in the cap screw from filling with glue.
   • For more information about flipping blow bars, check out this previous Service Question with James.

Knowing Who to Call

The last year of being in the service manager position has been an interesting year. John spent the previous 12 years as 91������’s Assembly Supervisor, spent time as the assembly team leader, and helped build impactors and jaws for several years. Going from the various positions, he has had the opportunity to learn even more about the equipment 91������ builds. Throughout this past year, John has been able to go to jobsites with the service technicians to get some hands on in the field experience to accentuate this experience in the shop.

“In the areas I don’t excel in, on the service side, I have listened and have learned a lot in the last year and know that I still have a lot to learn. Working with our service technicians, I am also learning from them, and I am happy to join you in your journey to learning more about rock crusher maintenance.”

Looking back at the past year, it has been a year of learning not only for John as the new service manager, but for everyone following along on this “Service Questions” journey. It’s important to always stay curious and ask questions before servicing your machine instead of causing unnecessary downtime.

When you have questions or concerns about the operation of your machine, it’s important to know the resources available to you to find that answer. If you cannot find the answer you’re looking for in your owner’s manual, you can reach out to your local, authorized dealer or reach out to 91������’s Service Team.

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