2155 hydraulics

[Fieldman12]

I noticed on my 3 point hitch when first starting that my 3 point hitch shakes on the way up when engine is at idle. Steering pto and everything seems to work as it should and picksup a heavy load fine. I am guessing it is the rockshaft seals??? If so, how hard are these to replace on a 2155 and I assume top cover below seat has to come off to remove???
 

[Tx Jim]

Look inside hyd oil filler hole for spraying oil with engine running,3pt raised. I would also suggest checking stand-by pressure . It should be 2250-2350 psi. It's possible that the pressure control valve on RH side of trans case by the hyd filter is blocking off stand-by psi.
 

[Hogleg]

check your fluid level?

John

PS - my 2550 was doing that, checked the level, was low, filled and all is ok. Just sayin'
 

[Fieldman12]

The tractor has independent pto and the eight speed transmission. I looked in the hydraulic filler hole and see no oil spraying. I do notice some oil dripping in there but does not appear bad at all. Also hydraulic oil was replaced with new Hygard from JD and transmission screen was checked to make sure clean. One thing I would like to rule out is the lines for pto that require splitting of the tractor. If one of those lines are damaged wouldnt you have loss of pto hydraulic power when operating pto?? I assume my lines are fine because when bushhogging I have no pto slip and hear the motor working as mowing gets tougher in tall grass. i have noticed sometimes when I start the tractor I hear a hydraulic noise. I notice if I tap the diesel fuel pedal it stops or I can just move the pto lever back on and then off real quick and the noise stops. Could there be an issue with the pto valve that could cause the 3 point hitch to shutter when raising? I would think that if it was a bad rock shaft seal that the 3 point all the time when idleing would shudder when raising. Mine just does it sometimes which leades to think a faulty valve such as the pto. I have not tested hydraulic pressue yet because I have no gauge and not reall positive where to tap into hydraulic system. Tractor has no remotes on back. As mentioned it could be valve by screen.
 

[Tx Jim]

You can test stand-by pressure on frt pump or on pressure control valve plug(parts key #15). A gauge will cost less than $20. I agree I think the pto supply tubes aren't the problem

 

[buickanddeere]

An occasional whine or moan from the hydraulics seems to be normal on those.
Main thing is to test the low pressure trans pump and the high pressure front pump. With various loads and pto positions.
 

[Fieldman12]

Any idea what size and threads I need on end of hydraulic gauge to test at both of these locations??
 

[Tx Jim]

Part Number: R39112
Description: PLUG
Specification
Weight 0.18 LBS 0.08 Kg
Thread Size 0.750 IN
TPI (Threads Per Inch) 16
Thread Length 0.438 IN
Length 0.750 IN