Hello everyone. Been a while! The 328 vintage bobcat year 2000ish is giving me trouble with the right side travel motor. When cold seems to be working fine. As it gets hot (few hrs of work) the left slows right down. At brief moments its like it stops completely. It always travels in reverse but the forward is where the trouble is.it tarvels perfectly straight in reverse but slightly slower on right when cold and going forward...almost not noticeable but i have been paying attention. There is no case drain on the machine that i know of or can find. My question is...if all gears same for forward or reverse what could be going on. I imagine the valve is also the same. Any help at all would be awesome.....its been plaguing me for some time now.
Take some pics of your pump and drive motors if you can and post them. It sounds like a possible relief valve problem
Good day Try switching the relief valves see if the issue moves to the opposite direction. Kind regards Uffex
I will try to take some pics. And thanks Uffex for the diagram. I was thinking of chasing the problem around by switching lines and valves. The problem might reveal itself. Wasnt sure if there is only one relief per motor. Which would eliminate the relief because it always travels in reverse. Was wondering if hotter hydraulic oil is swelling a line or something. If there is separate valves it would make more sense to me. I will keep you guys posted.
Looking closer at the diagram...are there reliefs right inside the travel motors itself? I have never opened one up before and thought it was just a valve block attached to motor.
And i forgot to mention that during these episodes of slowdown when i then attempt to travel in fast mode eveything seems fine. Not sure if it is because the other track is doing most of the work and i can only move in fast mode if traveling straight and using both motors in same direction.
Good day Opps it appears the crawler motors are without relief valves see attached. Kind regards Uffex