Ross drive motors

[liflod]

I just pulled my drive motor from my 632 because I have weak drive on one side. I disassembled the motor and everything looks good. The shuttle valve was stuck and wouldn't move. Would this be the cause of my very weak drive? Can the shaft seals cause the motor to have weak drive? They are very expensive.

 

[Tazza]

A stuck shuttle could indeed cause this issue.
Bad shaft seals wouldn't cause much loss of power, just a mess.

 

[liflod]

A stuck shuttle could indeed cause this issue.
Bad shaft seals wouldn't cause much loss of power, just a mess.

That's good to hear. I will clean and reassemble. Can you explain the operation of the shuttle valve?

 

[Tazza]

That's good to hear. I will clean and reassemble. Can you explain the operation of the shuttle valve?

I don't fully understand why they are required on drive motors with 3 hoses, but with two, it is needed to divert the internal leakage of the motor back to the tank. You can't send low pressure fluid back into the high pressure line, it needs to go to the low pressure one. The shuttle valve does this diversion, it knows what is high and what is low.
At least that is my understanding of how they work.