3155 hydraulic issue

ozarks · May 2, 2016

tim s-tex jim-tech 7 and whomever can help
Tim, I sent you info months ago on this one, but am just now getting to it--3155-6100 hrs--jd265 sl loader-sg cab--little to no loader function--3 point extremely slow--600# standby press at rear scv-- sump screen had minimal debris at last service--"bucket test" on main pump look good---just now tested flow at return side-past reserve tank and cooler, just to check flow--looked good-- there was a piece of rubber gasket, Tim, in the fitting in the top of the pump at first test--kind of wrapped around inside, I thought I had found the problem, but not---I have a picture of it, if I can figure out how to send--may not be important--
--at low engine rpm,hi-lo acts like brake is on--in low side--tractor rolls easy if flipped to high-----if rpm increases low side frees up---if any of that helps
---don't know where to look for getting standby pressure up--trying to keep this short--shoot me an e-mail someone, if needed

Tech 7 · May 2, 2016

I have seen that piece of rubber issue before. If you look at the ends of a new hydraulic filter there is rubber on each end. I have seen this rubber come loose from the filter and get washed downstream to the main pump. Keep looking there is probably more. It wouldn't hurt to look at the filter that is in there now to see if the rubber is intact, but thats not to say the rubber came from this filter.
I will have to do some thinking on the hi/lo issue. Have not seen the "floating rubber gasket" issue bother that system but anything is possible especially on a Mannhiem built.

tim s · May 2, 2016

Yes, I have seen this too,, it is usually caused by the cone in the filter bowl coming up missing and nothing to hold the filter tight, so it starts spinning from flow till it shreds the rubber seal off the end of the filter, I had one in here last year that had about a fist full of the seal in the gallery in the front of the main pump plugging the flow to near nothing,, I had one end up in the opening behind the brake valve flapped over the pipe feeding the front pump. When this happens it is on the clean oil side of the filter, gets shoved up through the top cover on the transmission, the shift cover, then back down and on to the front pump. It is hard to believe it can make this journey,, and pieces of it will catch and clog here and there along the way. These are "unique" systems..

Tx Jim · May 3, 2016

Hi-lo is possibly dragging from warped discs. Have you attempted to raise stand-by pressure? Have you checked operation of flow control valve down by hyd filter? How is loader hyd's attached to tractor?

ozarks · May 3, 2016

(quoted from post at 03:57:57 05/03/16)
Hi-lo is possibly dragging from warped discs. Have you attempted to raise stand-by pressure? Have you checked operation of flow control valve down by hyd filter? How is loader hyd's attached to tractor?

Loader is the mid-mount/passenger side John Deere setup--facory deal--ported filter cover and all------I need to know how to bring up standby pressure--steering, brakes,etc all work--steers better on hi/lo low if that helps----I Have had to flow control valve off--it all looked good--re-installed it with no change--Tim---the filter "plate" was missing on this tractor when I got it--ran it 3-4 years before I Knew that it needed it and put it in--thing that makes me wonder is--worked ok for first couple of years--I thought- then couple seasons ago was baling with it and all of a sudden all the hydraulics started working really well--as in faster in all positions--worked that way for a year and a half--then lost it last summer baling--hope this helps--sure do thank all of you for all your help--this is my baler-hay moving rig.

Tx Jim · May 4, 2016

(quoted from post at 18:24:17 05/03/16)

Loader is the mid-mount/passenger side John Deere setup--facory deal--ported filter cover and all------I need to know how to bring up standby pressure--steering, brakes,etc all work--steers better on hi/lo low if that helps----/quote]

To increase stand-by pressure on frt hyd pump unlock nut & turn screw(parts key 22) in while monitoring gauge.

Please clarify are you stating tractor steers better in "low speed" on hyd hi-lo??? If so hi-lo high clutch seals are leaking.

ozarks · May 4, 2016

uote="Tx Jim"](reply to post at 03:31:31 05/04/16) [/quote]

"Tx Jim"---steering functions better in lo side of hi-lo currently--jerks or catches a bit in high side of hi-low---did not do this before the current problem of low standby pressure--back screw out on front of pump, or turn in??

Tx Jim · May 4, 2016

Turn screw in(CW) to raise stand-by pressure.

ozarks · May 4, 2016

will be back at it tomorrow--do I need to remove a line at the flow control valve and see what happens also??

Tx Jim · May 4, 2016

I wouldn't remove line at valve unless 3 pt & scv's were inoperable.

ozarks · May 4, 2016

(quoted from post at 12:09:13 05/04/16)
I wouldn't remove line at valve unless 3 pt & scv's were inoperable.

ok--will get you an update Friday when I get back here--thanks very much

grwrench · May 4, 2016

hello, you need to check the charge pressure to the front pump. 5 psi. at idle, HOT will work ok,, this pressure
should go up big time when you rev up,, 20 psi. plus. while your gauge is hooked up shift the hi,lo & the pto to
see if there is more than 3 psi. change,,if so NOTE the function with lower pressure, this function has an
internal leak.. also destroke the main pump and look for more than 3 psi. change,, if so you have a HIGH press.
leak internal.. if the engine load changes when u destroke, you have a high press. leak to sump,, if no load
change the leak is internal to return circuit. these tests can be run at low RPM's as long as you hold 10 psi. on
your gauge. use a 60 psi. gauge.

grwrench · May 4, 2016

hello again,, i got to thinking about my post and made a mistake,, been awhile since i've been in this problem..
when you destroke the main pump to check for a hi press. leak [internal],, the pump will load or unload the engine
RPMs IF YOU HAVE A LEAK,,the difference will be IF the charge press. drops more than 3 psi..WHEN YOU DESTROKE the
PUMP,,theleak is to sump,,if no change in charge press. just change in rpm,s when you destroke,, then the leak is
into the return circuit,,SORRY

ozarks · May 6, 2016

(quoted from post at 20:20:59 05/04/16) hello again,, i got to thinking about my post and made a mistake,, been awhile since i've been in this problem..
when you destroke the main pump to check for a hi press. leak [internal],, the pump will load or unload the engine
RPMs IF YOU HAVE A LEAK,,the difference will be IF the charge press. drops more than 3 psi..WHEN YOU DESTROKE the
PUMP,,theleak is to sump,,if no change in charge press. just change in rpm,s when you destroke,, then the leak is
into the return circuit,,SORRY

THANKS to all--raised to standby pressure to 2250 yesterday afternoon-- have not run tractor too long yet, but all systems are functioning---maybe not as well as it could, but may improve with use-- gwrench, I will check out your tests when I can get back to it in a few days--thanks again

3155 hydraulic issue

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