Okay, so I've posted before about this machine as I've been working through some of the aging components and the bonehead things the previous guy did.
Here is a rundown of what I have done so far minus the engine stuff because that is working fine:
Here is a rundown of what I have done so far minus the engine stuff because that is working fine:
- new seals on drive motors
- new shuttle pistons on drive motors, mine were very worn
- new seals for tilt and lift cylinders
- new hydro filter, changed hydro fluid
- drained and cleaned chain case and filled with new oil
- removed and cleaned port block, changed all o-rings
- removed and cleaned/polished relief valves from hydro pump
- replaced all steering linkage bushings
- flattened the steering blocks that the pintle cams press against
- replaced the pintle cams
- fixed the transmission warning light and related sensors
- I think that is about it as it relates to hydro systems.
My problem is this, when moving the sticks slowly forward or backward, the pump sounds as if it surges up and down and this causes the drive to be erratic and jerky. If I have the machine with a decent straight area I can push the stick and get past the surging zone and the drive smooths out and is fine. As soon as I go to turn and back one of the sticks off into the "surging zone" the drive gets jerky and bucks.
This happens at any engine RPM.
My question is, is this a problem with the hydrostatic pump? Do I need to get wafer plates, rotating piston groups and seals for the TA1919v10?
I feel like there isn't much else that it could be but I have pretty much no experience on these machines so I'm sure you guys know better than me. Also, the other hydraulic functions work fine except the aux detent but I keep the aux locked out anyway. It may be sucking air through a gland nut on one lift cylinder but it is very slight if that is possible anyway, still not sure about that one.
Thanks for any info.