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Invalid email. This is required. Login to Your Account. Remember Me? Register Forgot password? What's New? Results 1 to 11 of Thread Tools Show Printable Version. Since I am looking for information on a mechanical component, it may be of interest to some. I recently bought a new to me Simplicity broadmood lawn mower in beautiful condition.

The wife has given me much heat about it cause it will not climb a hill. I changed the oil in the hydro unit and it is more quiet, but still is slipping internally. It is a hydro gear unit. There is no drain so I sucked the fluid out and refilled.

I can dis assemble anything and if I spot a problem, I can secure parts and repair. I can not afford to get a rebuilt unit. I have searched the net for days and have not found anything other than a parts list.

Does anyone here have advice on saving face with my family? Thanks for any advice you may have. Join Date Sep Location S. What type drive, belt or shaft. Does the unit get hot? When you reverse back down the hill is it controlled or uncontrolled?

Stupid Questions How is the motor connected to the hydro? If belt drive is the belt tight? How do you control the action I have old Dines with 2 levers and Skag with 3 lever, adjustment of the controls change the amount of drive while a slipping belt would reduce the power and possibly not make a sound, it seems lawn mowers have dried out belts turning on smooth pulies at slower surface speed allowing for a slipping belt to not make any noiseHusqvarna riding lawn mowers have a sealed transaxle or transmission and do not require fluid monitoring.

When you purchase a new Husqvarna riding lawn mower or have a new transmission installed, however, purge the transmission to release air within the system. Air enters the system during shipping and when the transmission is replaced. Air in the system affects the supply of power to the lawn mower's wheels for forward and reverse movement.

Raise the Husqvarna lawn mower's attachment lift lever on the left side of the operator's seat to the highest position. Walk to the rear of the lawn mower, and pull the freewheel control outward and down, locking the transmission in the disengaged position. Push the lawn mower to a flat, open area of your lawn. Sit in the operator's seat. Press the brake pedal forward with your left foot to engage the brake, and hold the brake pedal in that position.

Push in the attachment clutch switch on the right side of the dash to disengage the cutting blades. Push the throttle control on the left side of the dash upward to the fast setting, and pull out the choke below it to engage it.

Insert and turn the ignition key to the right, and immediately release it when the engine starts. Push the throttle control down to the slow position. Place the motion control lever on the right side of the seat in the center, neutral position.

Move the motion control lever upward to "Forward" for five seconds. Move the motion control lever down to "Reverse," and hold it there for five seconds. Repeat this procedure an additional three times. Move the motion control lever to the middle, neutral position, and turn off the engine by turning the ignition key. Walk to the rear of the lawn mower. Lift the freewheel control, and push it inward to engage the transmission.

Start the engine, and move the throttle to about one-half speed. Move the motion control lever to "Forward," and drive about 5 feet. Move the motion control lever to "Reverse," and drive about 5 feet. Move the control lever to the center, neutral position.

Repeat the forward-reverse-neutral process three additional times. Mary Lougee has been writing for over 10 years.

Understanding and Troubleshooting Hydrostatic Systems

She holds a Bachelor's Degree with a major in Management and a double minor in accounting and computer science. She loves writing about careers for busy families as well as family oriented planning, meals and activities for all ages. By Mary Lougee.Buying Advice. Pro Talk. Photos New media New comments Search media. Log in Register. Search titles only. Search Advanced search…. Today's Posts. Unread Posts. Search forums.

hydrostatic transmission slipping when hot

Log in. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Thread starter xray man Start date Jun 3, Joined Sep 2, Threads 3 Messages 8.

Transmission would slip after it got hot, no reverse. Worked after cooling off. I had heard that trans wasn't serviceable. Found a YouTube video that said otherwise. Removed transmission, drained it ,seperated case- all gears looked good, no metal shavings, just very fine metal stuck to magnet. I might have just been lucky that fixed it but I ain't proud. It would have been a pisser to junk the mower because it needed a transmission.

I imagine there's been a lot of them junked because the transmission took a dump and folks thought they couldn't be fixed. Anyhow, thought I'd throw that out there in case somebody runs into the same problem.

But I got out of that ditch and slid in another one. See my next post please.Hydrostatic drives are used in a variety of applications throughout all types of industries. They are sometimes referred to as hydrostatic transmissions. Common applications include conveyors, log cranes, mobile equipment, centrifuges, chemi-washers and planers.

What Makes a Hydrostatic Lawnmower Not Move?

Hydrostatic drives are some of the least understood systems because many of the components are located on or inside the hydrostatic pump assembly. A schematic of a typical hydrostatic drive is shown in Figure 1. The bi-directional, variable displacement pump controls the direction and speed of the hydraulic motor. This type of drive is commonly called a closed-loop system. Figure 1. A typical hydrostatic drive.

A piston-type pump is always used in a hydrostatic system. The pump volume can range from zero to the maximum amount. In Figure 2, the pump swashplate is in the vertical position, which means the pump output is zero gallons per minute GPM. The swashplate is moved by two internal cylinders, which are controlled by a separate valve or manual lever. Oil flow is then directed to the motor for rotating the shaft.

Hydrostatic Drive Loader Doesn't Drive When Warm

This port will act as the suction port in this direction. To drive the motor in reverse, the top cylinder will extend, allowing the swashplate to angle in the opposite direction Figure 4. The amount the swashplate angles in each direction will determine the flow from the pump. A charge pump is mounted on the back end of the main pump. This is sometimes referred to as a replenishing pump. In some cases, the charge pump is located inside the main pump assembly. The charge pump volume is normally percent of the main pump volume.

The pressure will continue to build in both ports until the relief valve setting is reached. The charge pump relief is usually set between pounds per square inch PSI. The oil then returns to the tank through the case drain line. The purpose of the charge pump is to provide makeup fluid to the system during operation. There are tight tolerances between the pistons and the barrel in the pump and motor.

This means that some of the oil inside the pump and motor will bypass the pistons and flow back to the tank through the case drain lines. Because of this bypassing, less oil flows out of the motor than what the main pump actually requires. The charge pump will supply makeup oil through the check valve, preventing pump cavitation. The charge pump is also used to supply oil to the spring-loaded cylinders for stroking the main pump.

The charge pump relief valve provides a flow path for the excess pump volume to return to the tank in idle mode. The relief valve is normally mounted on or near the charge pump. In the system shown in Figure 2, the relief valve setting determines the pressure in the system when in idle mode.Purchasing a lawn tractor with a hydrostatic transmission represents a significant financial investment for most homeowners, so it can be particularly frustrating when you experience trouble shifting the machine.

Hydrostatic transmissions, unlike those that contain traditional manual or automatic transmissions, use an oil-filled hydraulic pump to control the mower's speed and direction. When shifting problems occur, it's crucial to repair them quickly so you're able to use the tractor in the most effective manner.

When it comes to shifting and directing the lawn tractor, hydrostatic transmissions rise head and shoulders above other types of transmissions. On a hydrostatic model, you'll never encounter grinding or stuck gears because there are no gears to grind. You also do not need to stop the mower to shift it into another gear to slow or speed up the machine. Simply use the hydrostatic controls to make the change while you're still in motion. Although mechanical problems with hydrostatic transmissions are rare, they do occur occasionally.

A leak of the oil that powers the hydraulic pump will reduce the internal pressure and can cause difficulty in shifting. You may notice the lawn tractor simply doesn't have the power it had previously or doesn't respond to your shifting. It's also is possible the transmission control arm may be out of adjustment, affecting its performance when you shift the machine.

If the tractor's wheels continue to move when the machine is in neutral, it's time to access and adjust the adjustment bolt. When there is no response to your movement of the shift control arm, you may have activated the manual bypass lever. Useful for towing or pushing the lawn tractor, the manual bypass lever will stop the tractor from responding when you push the control arm until you disengage the lever.

If you're new to using a hydrostatic tractor, simple operator errors may fool you into thinking you have a shifting problem. Before you jump to conclusions, ensure you've released the parking brake before shifting the machine or the tractor will not respond to your adjustment of the control lever to move forward or backward. Trying to shift while using the cruise control feature may also make it appear there's a shifting problem.

hydrostatic transmission slipping when hot

As long as the machine is in cruise control mode, you will be unable to shift to a higher or lower speed; disengage the cruise control before attempting to shift. Since most hydrostatic transmissions are completely sealed within a steel or metal casing, they aren't accessible to the user when it comes to repairs. Rather than risk voiding the warranty that came with the lawn tractor by attempting to work on the hydrostatic transmission yourself, seek out an authorized service representative to perform diagnostics or make repairs.

Troubleshooting and repairing a hydrostatic transmission is beyond the scope of the average homeowner, who likely doesn't have the appropriate tools, training or knowledge for the job. Amie Taylor has been a writer since Book reviews, gardening and outdoor lawn equipment repair articles and short fiction account for a handful of her published works. Taylor gained her gardening and outdoor equipment repair experience from working in the landscaping and lawn-care business she and her husband own and operate.

By Amie Taylor. Benefits of Hydrostatic Transmissions When it comes to shifting and directing the lawn tractor, hydrostatic transmissions rise head and shoulders above other types of transmissions. Potential Problems Although mechanical problems with hydrostatic transmissions are rare, they do occur occasionally. Operator Error If you're new to using a hydrostatic tractor, simple operator errors may fool you into thinking you have a shifting problem.

Hydrostatic Transmission Repairs Since most hydrostatic transmissions are completely sealed within a steel or metal casing, they aren't accessible to the user when it comes to repairs. Photo Credits. About the Author. How Do Hydrostatic Lawnmowers Work?Test your tractor for creeping at least once a year or as needed if hydrostatic transmission symptoms appear sooner.

How to Troubleshoot the Hydrostatic Transmission in a Cub Cadet

Take care to practice safety measures to avoid serious injury when the tractor is jacked up off of the ground. Many hydrostatic transmission problems on a Cub Cadet tractor are due to a transmission control rod misalignment.

The transmission control rod causes the tractor to rock slightly forward or backward when the engine is powered high idle speed while it is in neutral. If your tractor has been in use for a few years, this form of 'creeping' may occur. Troubleshoot the hydrostatic transmission control rod first to avoid unnecessary and costly transmission repairs.

Set the front of the tractor against a stable post or wall that is in a fixed position. The object the tractor is leaning on must not move. Put the drive control levers in neutral, disengage the parking brake, start the tractor and idle it high. Inspect the rear wheels and verify that both are rotating. If one or both wheels do not move, turn off the tractor, take the flange lock nut off of its designated transmission control rod and then use the hex screwdriver to remove the hex screw.

Start the tractor and then inspect the rear wheels and verify that the affected wheel is not rotating.

Fix Your Hydrostatic Transmission Problems Fast

If it continues to rotate, stop here and contact Cub Cadet for further support; otherwise, continue to the next step. Turn off the tractor and then move the control rod either up or down to the free hole in the control arm. Nina Nixon has more than 30 years of professional writing experience. She enjoys writing about business and technology.

Hunker may earn compensation through affiliate links in this story. Things You'll Need Jack Hex screwdriver. Tip Test your tractor for creeping at least once a year or as needed if hydrostatic transmission symptoms appear sooner.

Warning Take care to practice safety measures to avoid serious injury when the tractor is jacked up off of the ground. Step 1. Step 2. Jack up the tractor's rear. Both rear wheels must be one inch off the ground. Step 3. Step 4. Step 5. Step 6. Step 7. Reattach the hex screw and flange lock nut. Step 8. Use the jack to lower the tractor to the ground and then move it out from under the tractor.Friction creates heat. Fluid under pressure, being forced through restrictions, is subject to friction losses and pressure losses, generating heat as a by-product.

All the moving parts also are subject to friction losses, which also generate heat. The heat you feel is directly related to the efficiency losses in the transaxle. Check any filters that may be restricting oil flow to the transaxle.

Are any heat exchangers installed in the system? The heat can also be created from the transaxle being overworked by other components in the system that are not operating properly.

Ditto to what RVZ said. I would also add that the units should be kept clean. Dirt and debris stuck to the casing and cooling fins prevent heat from being transferred away. The design of the machine the hydros were put into can also be a factor. In other words, is the machine around the hydros designed to provide sufficient air movement and cooling or does it hinder the fan's performance.

Keep in mind that if this has a lot of hours on it, say more thanthe parts may simply be getting worn. Depending on the application, those units can have design lives of anywhere from to hours. Even though the parts look good, they may be worn past their optimal tolerances. There may be some seals that are worn as well. Between the hydraulic components and the mechanical components, the efficiency losses are enough to noticably affect the performance.

The greater the inefficiencies, the greater the heat buildup.

hydrostatic transmission slipping when hot

On the plus side, the unit is probably rebuildable. Hydrostatic transmissions tend to be very inefficient. Back in the 's I tested a variety of hydrostatic transmissions for lawn tractors as GM was looking to put a hydrostatic transmission in a Cadilac. That means a lot of heat is produced when operating a hydrostatic transmission, especially when operating at a high reduction ratio. Since you mainly use the mower in hot weather, if it was my unit, I would fill the transmission with 10W40 or 20W50 Multi Viscosithy Engine oil when you put it back together.