yale forklift hydraulic pump free sample

Since their invention,hydraulic forkliftshave helped people get difficult, heavy work done. If you are a heavy equipment operator, it’s important to understand how these forces work and the different parts that go into them.

Understandinghow a forklift hydraulic system worksis simpler than you might expect. It all depends on specialpressurized fluidusedto power the engine of a car or machine. Hydraulic presses put pressure on a small amount of liquid to create a large amount of power.

Confined liquid has pressure on it from one side. That pressure forces the liquid against a piston on the other side of the container. That transfers energy into the piston, forcing it upward. The piston cannot move in the opposite direction unless the pressure is released. In terms of theforklift hydraulicsystem, the pistons raise the forks and keep them lifted until the hydraulic pressure is released by the operator.

Produces a constant flow of hydraulic fluid to supply the control valve. Most forklifts use a gear-type pump. The pump consists of a pair of rotating gears that push the fluid in the opposite direction of the rotation.

Starts and stops the direction of fluid and controls where the fluid moves using spools. Without a control valve, forklift hydraulic pressure would be useless.

The types of fluids used inhydraulic forkliftsinclude water-based fluids, petroleum-based fluids, and synthetic fluids. Water-based fluids are fire-resistant but do not provide as much lubrication as the other types. Petroleum-based fluids are customized to the hydraulic system with additives and are the most popular. Synthetic fluids are useful for high temperature and high-pressure systems.

If you’ve ever put your finger over a hose while it’s running at full blast, you’ve experienced the power of hydraulic pressure. The same principle is at work inforklift hydraulics. While air can be compressed, liquids cannot, so when you exert pressure in a confined space, you create hydraulic pressure.

Giant pistons on the front of forklifts are responsible for hydraulic pressure. They’re fed by fluid hoses with a high pressure pump at the end. They supply the pressure necessary to move hydraulic fluid through the system and move pistons up and down.

What happens when there is a very heavy load for the forklift to lift? That’s when the Flow Divider comes into play. It can split one line of fluid into two, three, or more.  By splitting or recombining the hydraulic line, the force can be increased or decreased. The hydraulic pump exerts a finite amount of pressure, but each load requires a different amount of pressure, so the flow divider can reduce the pressure by diverting fluid back into the reservoir, or increase it by sending all the fluid through to the cylinders.

Another crucial part of the system is the Return Filter, which is exactly what it sounds like.  It cleans theforklift hydraulic fluidof any contaminants before it goes back into the reservoir.

Forklift hydraulics raise the load-bearing prongs off the ground. Ahydraulic forkliftlifts and holds the load in the air while the forklift moves. A forklift hydraulic system is the heart of the machine because it is responsible for moving pallets. And the heart of your company’s safety program is proper hydraulic forklift training and certification! The levers control the hydraulic system in a forklift. The operator needs to be very careful with them. It’s important that only trained and certified operators use forklifts. They need to properly calculate the load and how much lift power is needed to move it. The hydraulics of a forklift have a lot of power, and only a small amount of effort can create enough force to move a large, heavy load.

The proper usage andmaintenance of a forkliftwill keep the forklift hydraulic pressure system in good working condition, without needing constant repair work.

French scientist Blaise Pascal discovered the principle behind the hydraulic system over 300 years ago. Pascal learned that liquid cannot be compressed. When pressure is put on a confined liquid, the liquid transmits pressure in all directions. Those are the basic principles behind the forklift hydraulic pressure system. For example, if a container holding liquid has an opening, the liquid will try to escape at a pressure that’s equal to the pressure put into the container.

In the late 1700s, British mechanic and engineer, Joseph Bramah, used Pascal’s principles to experiment on practical applications. In 1795, Bramah patented the first hydraulic press which became the basis for the modern-day hydraulic system.

To determine which grade of hydraulic fluid a forklift uses, consult the lift’s operations manual. Here, you can find full details about the proper type of hydraulic fluid for a forklift, how often the fluid should be changed, and other pertinent information. If you cannot find the lift’s operations manual, use a general purpose fluid like ISO 32 hydraulic oil.

When it comes to hydraulic fluid for a forklift, stick to the recommendation included in the lift’s operations manual. Using the proper hydraulic fluid limits the risk of wear and tear on your lift.

Forklift hydraulic fluidmust be regularly topped up for maximum effectiveness. Locate the hydraulic reservoir on your lift. It should have a vented fill cap with a fill gauge or sight glass on the side to indicate fluid level. Remove the cap and then pour in the oil and begin pumping the liquid into the reservoir. Keep an eye on the levels; once the oil reaches the maximum fill line, you can stop pumping. Remove the fill nozzle and replace the cap.

To fully comprehend the power ofhydraulic forklifts, it helps to understand Pascal’s Law. It explains how force changes pressure. To calculate the hydraulic advantage of your particular lift, understand that the force exerted is equal to the pump pressure multiplied by the surface area of thehydraulic fluid cylinder. For instance, a system with 1000psi pushing against a cylinder with a surface area of 10 inches provides forces of up to 10,000 pounds.

Hydraulic system hoses are used to transfer fluid pressure. But, a hose deteriorates over time, and it can crack and leak. Other factors that can cause a hose to crack or leak include the use of an improperly fitted hose fitting or use of an incompatible type of hydraulic fluid.

A suction filter can become clogged if it goes unchanged for an extended period of time. In this instance, the filter can no longer catch and remove contaminants from the hydraulic fluid. It can also stop the flow of hydraulic fluid.

At the first sign of anyhydraulic forkliftproblems, it is beneficial to diagnose and address these issues. This ensures that a forklift can be fixed or replaced before it can potentially put the health and wellbeing of lift operators in danger.

You don’t have to be an expert onhydraulic forkliftsto know thatwell-trained driversare essential for workplace safety. Whether your warehouse runs electric lifts or hydraulic forklifts,CertifyMe.netis your #1 source for OSHA compliant training and certification.

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Operator training will keep all workers safe in the vicinity of the forklift, and ensure that operators have the proper understanding of how the hydraulic system works and how it is used most effectively.

Check out the online forklift training fromCertifyMe.netfor the most convenient and comprehensive forklift training available. Operators learn how to run a forklift, perform equipment inspections and operate the forklift hydraulic pressure system correctly. Sign up today for same-day certifications!Have questions about our certification opportunities or want to speak with our team?Reach out online

This is the actual mechanical structure that allows the forklift to lift specified loads to specified heights. The upright shares common items, with attachments and other applications making certain uprights function differently for specific jobs. Uprights are also commonly known as masts.

Uprights are designed to allow a vehicle to pass through doorways or trailers with the upright in the collapsed position while still being able to reach loads in warehouse racking. This is accomplished through a series of nested rails and hydraulic lift cylinders and chains to raise the upright in “stages”.

where the main line from the hyd pump connects to the hyd control valve check that fitting, it should be a largish 90deg elbow where the main line/hose connects to the control valve. If there is an 1/8in pipe plug in it that is where you connect your gauge to to check hydraulic pressure from the pump. It may also have a oring plug or a cap in the main inlet valve section where you can connect a gauge, there will be the same for checking the secondary pressure as well in the opposite side of the control valve in the auxiliary sections. There are also a main and secondary relive valve with an adjuster nut on top where you can remove the top and check the spring inside it and see if it is broken if need be.

If you do not find any plugs to connect a gauge to then you may have to do it the old fashion way by installing a Tee fitting inline where you can connect a gauge that way. (yes you may have to visit a hydraulic shop to get those, if so make sure you know the size of the fitting or remove it and take it with you so they can get you the correct one). Yale was pretty good about providing a test port in the inlet section and the auxiliary section so you probably won"t have to go through all that.

Low pump pressure can cause steering problems because the steering gets it"s pressure from the control valve that goes through a priority valve located down on the transmission area. The pressure from the pump should be around 2200 secondary to 3100psi at primary relief pressure. I"m not specifically sure the exact pressure because i do not have the service data for that truck, but the trucks in that series generally had close to the same pressure ratings, they haven"t changed that much over the years.

Hydraulic Pumpsare highly utilized parts in a forklift. For example, hydraulic pumps can be found in the power steering system, braking system, suspension system, and gear and motor system. The focus of the following article refers to the hydraulic pumps in gear and motor systems.

Forklift Hydraulic Pumps found in the gear and motor systems provide the flow required to transmit power to a hydraulic actuator from a prime mover. There are two types of hydraulic pumps; centrifugal and positive displacement. Centrifugal involves the flow of the fluid transfer, which depends on the outlet pressure. Whereas, the positive displacement depends independently on pressure. The hydraulic flow is created when the prime mover drives the pump rotating group, which forces fluids out of the pump outlet. When the fluid is forced out, a vacuum force is made at the pump inlet and its natural pressure pushes the fluids from the reservoir into the pump.

Positive displacement pumps come in two forms: fixed displacement and variable displacement. Fixed displacement (hydrostatic) pumps have the flow varying only on the shaft speed. Its benefit is that it performs well, creating a constant flow and pressure. Variable displacement (hydrodynamic) pumps can have flow varying on any shaft speeds provided. Though variable displacement is the more expensive alternative of the two, it is more energy efficient. Also, it performs well for variable flow or pressure applications.

A common hydraulic pump problem is one with bad gears. The bad gear problem may occur for various reasons such as wear, high temperature of the hydraulic fluid, fluid leaks and contamination, and aeration which occurs due to air pockets. Checking the hydraulic pump gears is as follows:

Hydraulic pumps can be found inside or outside of the engine. To dissemble the pump, the bolts has to be unscrewed. They are found on the side for the outside pumps or the bottom for the inside pumps.

The clearance should be measured between the gears and the pump’s housing cover with a straightedge. Generally the clearance is between .001 to .004 inches. When the measurement exceeds .005 inches, the gears should be replaced immediately. Also, ensure that the gears are absolutely installed into the pump and that their measurements are consistent.

The gear teeth clearance to the pump body should be checked and ensured that the teeth length is consistent. Generally the clearance is between .001 to .005 inches. Check the specifications.

All components should be cleaned prior to reassembling the pump. The gears and the pump housing should be cleaned and blow dried. Petroleum jelly can be applied to all inner components.

If the findings from the above steps concludes that the components are damaged are worn out, they have to be replaced. Solid Lift Parts Inc. provide hydraulic pump components for all makes and models for inexpensive prices. The hydraulic pump and its components should be replaced by a professional mechanic with expertise in hydraulic pump replacement.

Are you in need of affordable hydraulic filters suitable for Yale forklifts? Whether you manage a few Yale forklifts or an entire fleet of Yale forklifts, our aftermarket hydraulic filters allow you to keep costs low and keep your Yale forklifts operating at peak productivity.

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Yale forklifts are designed to last, but hydraulic filters are susceptible to wear and tear. High-quality forklift parts are essential to keep your Yale forklift running and your employees safe. Looking for a reliable partner?TVH can supply quality hydraulic filters suitable for any Yale forklift model.

Each month, 24500 new part numbers are added. You will never have to search for "Yale forklift parts near me" ever again. In addition to hydraulic filters, you will find a wide variety of other replacement parts suitable for Yale forklifts, including:

Our quality control department makes sure we only include quality parts and accessories suitable for Yale forklifts in our product range. We have strict standards:

Yes. Our electronics department in Belgium is Europe’s largest, best equipped and most diverse service centre (surface of 3500 m²) for the repair of electronic parts for Yale forklifts. There, our engineers work in an ESD-safe zone or EPA (electrostatic protected area). Each of our engineers is specialized in a specific brand so that we can guarantee optimal quality, as a result of optimal knowledge. Learn more about the

When your Yale forklift breaks down, the last thing you need are complicated processes and delayed shipments. That’s why we’ve made getting new hydraulic filters from TVH easier than ever for you.

Save research time and reduce search errors by registering your Yale forklifts in our online shop. You can personalise your equipment by adding your own reference, images, documents and notes.

For that reason, we"ll stick to Toyota propane forklift troubleshooting in this article,focusing on the Toyota 8-Series fork trucks with 4Y engines built prior to 2020.

When a liquid propane tank is properly installed on a forklift, the fuel intake tube (in red) is pointed downward, allowing it to suck up the liquid fuel.

Additionally, cold temperatures can cause the regulator itself to freeze, which further prevents the fuel from flowing and ultimately the forklift from starting.

An example of an improperly-connected propane fuel coupler. The large space between the red tank-side coupler and the golden forklift-side coupler indicates that the quad ring has popped out of place

If you suspect that your fuel filter needs to be replaced, it’s best to call a qualified forklift technician. Because a forklift’s fuel line may contain pressurized liquid propane, changing the fuel filter can result in a release of that fuel. And if that happens, serious injury can result.

As we noted in the How Does a Propane Forklift Fuel System Work? section, the fuel solenoid acts as a “gatekeeper,” preventing or allowing fuel to flow from the fuel line into the regulator and beyond.

Fuel solenoid troubleshooting can get very complicated very quickly. So in these cases, it’s best to contact a qualified forklift technician to troubleshoot the root cause(s).

If you’re experiencing a no-start situation with your forklift, and you’ve traced it to the regulator, you should first check the various hoses and tubes going to and from the regulator.

REMINDER: Regulator maintenance should only be performed by a qualified forklift technician. Propane is extremely cold and can quickly cause serious injury if proper precautions aren’t taken.

Are all hoses to and from the regulator connected, snug, and free of any damage? (Only check when the forklift is off and the engine is cool. And make sure to follow all safety warnings and decals!)

Single Gear Pump Assembly Repair ........................................................................................................................ 4

Tandem Gear Pump Assembly ...............................................................................................................................20

Gear Pump Specifications ...................................................................................................................................... 26

Variable Displacement Pump Repair ......................................................................................................................31

Variable Displacement Pump Specifications .......................................................................................................... 54

Hydraulic Gear Pump ......................................................................................................................................... 55

Variable Displacement Pump ............................................................................................................................. 56

Internal combustion-powered forklifts need service every 250-300 hours. Filters need to be replaced, parts need to be greased and you can find small problems before they become expensive repairs.

Below is a sample annual maintenance schedule for IC (Internal Combustion) and electric forklifts — a general list of what to service (and when) to avoid expensive repairs. This example schedule is for illustrative purposes only. Always follow manufacturer-specific guidelines for your forklift.

As mentioned above, internal combustion forklifts need service every 250-300 hours. Hours are measured using key hours (the amount of time the forklift is switched on), or pedal hours.

An average single-shift operation that uses their forklift(s) 2,000 hours a year should have their forklifts serviced about every 60 days. A forklift may need service more frequently if:

Below is an example one-year maintenance schedule for an IC forklift used by a single-shift operation. As mentioned above, some forklifts need service more often, and you should always follow manufacturer recommendations.

One of many reasons electric forklifts are so popular is their low cost of ownership. There are comparatively few parts to replace and they require minimal maintenance compared to internal combustion forklifts.

Generally speaking, electric forklifts should be inspected and serviced about every 500 hours. On an electric lift truck, “hours” are measured using drive motor/hydraulic running hours. An electric forklift service call should include:

But there’s no getting around the fact that skipped maintenance is an expensive repair waiting to happen. It’s like buying cheap work boots or low-quality tools. You might save a few hundred dollars in the short term, but you’ll lose money eventually when that forklift breaks down.

A maintenance plan is an inexpensive way to protect your business against expensive downtime. You pay a flat rate every month, and an experienced technician ensures your forklift is taken care of. When you sign-up for maintenance from The Lilly Company, you can relax knowing:

The Lilly Company is proud to serve customers throughout Alabama, Mississippi, Tennessee and eastern Arkansas. Contact one of our forklift maintenance experts online or by phone (800-238-3006). Or, come say hello at one of our 13 locations across the Mid-South.