Bobcat T300 stalls under load and hyd. fluid seems to heat up fast.

ronniebrugh · Aug 29, 2017

2005 T300 new hydrostatic and gear pump, drive motors, hoses, case drain and hyd. filters, flushed oil cooler, new brake valve assy., new main relief valve, charge pressure good...
if you move either stick or both forward it stalls out.... and fluid seems really hot... thinking flow restriction somewhere?

Jabonee · Aug 30, 2017

Sounds like the brakes are not releasing. Do you have a porta-power to test?:confused3:

ronniebrugh · Aug 30, 2017

yes I have portapower, and brakes are releasing. if the machine is on jack stands you can give it full stick with out stalling. this machine has been in salt too. I am considering maybe the track rollers are binding...

Jabonee · Aug 30, 2017

ronniebrugh said:
yes I have portapower, and brakes are releasing. if the machine is on jack stands you can give it full stick with out stalling. this machine has been in salt too. I am considering maybe the track rollers are binding...

With that being said I still think the brakes are not releasing or better yet being overwhelmed by the track motors. Is this a 2 speed unit and does it have a lot of hours? If you have a high enough pressure gauge and can tee into the track motor case drain line that will tell the story. Basically what I'm saying is the track motors can leak by so bad that the 400psi or so pilot pressure is not enough to release the brakes.Sounds like the problem when you said it works OK off the ground(no load)

ronniebrugh · Aug 30, 2017

I can manually apply brake and it will hold(enough to stall engine while on jackstands). Drive motor is new not saying a new one isn't bad though

Jabonee · Aug 31, 2017

ronniebrugh said:
I can manually apply brake and it will hold(enough to stall engine while on jackstands). Drive motor is new not saying a new one isn't bad though

Interesting. If you can stall the motor with the park brake on your pumps and motors should be ok. Your having this issue in both forward and reverse? Is this unit manual control or SJC? Can you post the sn#?