T750 drive issue on one side

[naharra]

Hi, have a 2013 T750 and the drive on the left track doesn't have forward very often but reverse seems to work okay.
Did a pressure test at the pump at the left drive motor fittings …… capped both forward and reverse off and hooked in a pressure guage and it reached about 5400 psi for the left side drive motor at both the forward and reverse ports every time I moved the travel lever.
Replaced the left side drive motor and still don't have drive in forward very often , but in reverse it seems fine.
I have not put a pressure guage Tee'd in with the drive motor hoses yet , is there anything else on the pump that could cause the travel issue in the forward direction only ?



Thanks.

 

[Fred Zhang]

Did you replaced an original drive motor?

 

[naharra]

Did you replaced an original drive motor?

Yes

 

[River Fluid Power]

Hi, have a 2013 T750 and the drive on the left track doesn't have forward very often but reverse seems to work okay.
Did a pressure test at the pump at the left drive motor fittings …… capped both forward and reverse off and hooked in a pressure guage and it reached about 5400 psi for the left side drive motor at both the forward and reverse ports every time I moved the travel lever.
Replaced the left side drive motor and still don't have drive in forward very often , but in reverse it seems fine.
I have not put a pressure guage Tee'd in with the drive motor hoses yet , is there anything else on the pump that could cause the travel issue in the forward direction only ?



Thanks.

Manual controls or SJC?

 

[naharra]

Manual controls or SJC?

SJC

 

[River Fluid Power]

It could be the solenoid or coil for that direction on the motor. You can switch the items marked number 2 in the attachment to verify. If the problem moves when you switch them you have found the problem. Take off the plastic caps, slide off the coil, and then unscrew the solenoid stem. Installation is the reverse. You can try just the coils first and then the solenoids. Or just switch it all the first time so you only have to do it once. They are sold as a set anyway.

 

[naharra]

It could be the solenoid or coil for that direction on the motor. You can switch the items marked number 2 in the attachment to verify. If the problem moves when you switch them you have found the problem. Take off the plastic caps, slide off the coil, and then unscrew the solenoid stem. Installation is the reverse. You can try just the coils first and then the solenoids. Or just switch it all the first time so you only have to do it once. They are sold as a set anyway.

Thanks, I'll give that a try

 

[naharra]

It could be the solenoid or coil for that direction on the motor. You can switch the items marked number 2 in the attachment to verify. If the problem moves when you switch them you have found the problem. Take off the plastic caps, slide off the coil, and then unscrew the solenoid stem. Installation is the reverse. You can try just the coils first and then the solenoids. Or just switch it all the first time so you only have to do it once. They are sold as a set anyway.

Changed the coils and solenoids on the left side …. no difference.
Left drive motor still doesn't drive in forward very long and stops .

 

[River Fluid Power]

Changed the coils and solenoids on the left side …. no difference.
Left drive motor still doesn't drive in forward very long and stops .

Pump tests good. Motor replaced. Swapping solenoids and coils makes no difference. Only thing left in my mind is the electrical input to the pump controls. Time to test with a meter.