2018 Toolcat 5600 drive motor pressure from hydrostatic pump question

[RichardV-Quebec]

Hello everyone, I have a front drive motor issue and wrote about it in another post and I have yet to resolve the problem. I found small debris in the drive motor relief valve, took it out and reconnected the drive hoses, yet the motor gear is still not turning but the rear wheels are. The drive motor is not mounted on the transaxle so the brakes are not the problem. Does anyone know what pressure is supposed to be on the drive hose ? So far, when in neutral, at low idle (1300rpm), pressure is 110 psi arm rest up and 140-150 psi with arm rest down. At 2,000rpm, 320 psi still in neutral. I read somewhere, the replenish valve may not be seating correctly in the hydrostatic pump. To get there, I need to remove the CAB. So I am looking for a way to test this without removing the cab. the transaxle is on the floor and I have one of brake line capped with a pressure meter.

 

[RichardV-Quebec]

Hello everyone, I have a front drive motor issue and wrote about it in another post and I have yet to resolve the problem. I found small debris in the drive motor relief valve, took it out and reconnected the drive hoses, yet the motor gear is still not turning but the rear wheels are. The drive motor is not mounted on the transaxle so the brakes are not the problem. Does anyone know what pressure is supposed to be on the drive hose ? So far, when in neutral, at low idle (1300rpm), pressure is 110 psi arm rest up and 140-150 psi with arm rest down. At 2,000rpm, 320 psi still in neutral. I read somewhere, the replenish valve may not be seating correctly in the hydrostatic pump. To get there, I need to remove the CAB. So I am looking for a way to test this without removing the cab. the transaxle is on the floor and I have one of brake line capped with a pressure meter.

I forgot to mention, at one point I got 950 psi when in forward drive with drive pedal down.

 

[oldnslo]

What you are seeing sounds like charge pressure when hydrostatic drive is in neutral. Asking to move forward or reverse will increase pressure in one of the lines. Pressure will only rise to point of what it takes to turn the motor.