Hi Everyone,
We have a hydrostatic transmission in our combine that which has problem. Left turning is suddenly impossible. It can be driven front or reverse or right turning but left turning is a big trouble.
This system has a pump and a motor (JEIL a japanese manufacturer) built in together with gearbox and power transmission by axle shaft to the drives.
Any advice is appreciated.

This Combine is not familiar to me but it seems that the machine has two
systems, Propulsion and Steering. If so, and if you have a double acting
cylinder for steering, probably internal seals were damaged. Check Cylinder.

Hi,
This transmission fully dedicated only for the propulsion within gearbox has clutches too.

quote:

Hi Everyone,
We have a hydrostatic transmission in our combine that which has problem. Left turning is suddenly impossible. It can be driven front or reverse or right turning but left turning is a big trouble.
This system has a pump and a motor (JEIL a japanese manufacturer) built in together with gearbox and power transmission by axle shaft to the drives.
Any advice is appreciated.

I don't quite follow your drive arrangement. Is it mechanical drive to an axle that has hydraulic diff steer motor in the axle (like a D8 diff-steer cat?

Or is there one hydrostatic transmission for each drive wheel?

Sorry, need more info.

First, what do you mean by "big trouble"?

The hydrostatically driven combines I have been around use a single drive motor into a 2 or 3 speed transmission with an integral differential. Driveshafts transmit the power to outboard gear reduction units, which also support the vehicle weight. The brakes can be on either end of the driveshafts or internal to the gear reduction units.

With this type of propulsion I don't see how the hydrostatic part could cause the problems you have observed, it doesn't care if you are turning left or right. Like Nahum said could it be the steering cylinder or steering linkage? Could also be a differential problem.

ISZ

quote:

Originally posted by Doug Hanson:

quote:

Hi Everyone,
We have a hydrostatic transmission in our combine that which has problem. Left turning is suddenly impossible. It can be driven front or reverse or right turning but left turning is a big trouble.
This system has a pump and a motor (JEIL a japanese manufacturer) built in together with gearbox and power transmission by axle shaft to the drives.
Any advice is appreciated.

I don't quite follow your drive arrangement. Is it mechanical drive to an axle that has hydraulic diff steer motor in the axle (like a D8 diff-steer cat?

Or is there one hydrostatic transmission for each drive wheel?

Sorry, need more info.

Hi,
This has only one gear box with axles connecting the track sprocket as below.

Pump->motor->gearbox->axles->sprocket.
Thanks

Hi,
I think your hydrastatic transmission have might be pilot operated DCV, the particulat left side turn DCv is not getting proper pilot pressure, if there is a manual ride ,go and test it.
Regards,
Moorthy