Combines hydrastatic transmission 2166

[Deadduck]

If the hydro isn't making any whining noise I would say the problem is somewhere else. The first thing I would check are the drive axles between the gear transmission and the final drives. The splined coupling will often strip out, and will allow movement such as you described. If that's not the problem, then you're probably looking at a problem in the final drive or gear transmission.

 

[buck]

I have checked the components you suggested and they fall within tolerances.Could it be in the hydraulic pump or motor.

 

[Deadduck]

In my experience, when the hydro pump or motor starts to go, you lose speed, especially going uphill, and you get a lot of whine and a general sluggish feeling. This gets worse as the oil gets hotter. If you aren't experiencing those symptoms, I would bet you have a problem in your gear transmission. But it could possibly be in the hydrostat. It might be time to get a mechanic out to check the hydrostat out.

 

[Deadduck]

I just re-read your original post. It could be that the hydro pump is not supplying enough oil pressure to operate both the front and rear wheels. This could mean the pump is starting to fail, or it might require a seal or something if it is leaking. Also, if one of the hubs is going out in the rear, it could cause a stalling situation where all of the oil flow diverts to the path of least resistance. Had that happen on a 1460 one time. This is an interesting situation, and it would probably be a good idea to call a mechanic who could check the pressures in the hydrostat system.