2755 Trans pump

fordfx413

Member
I just got my 2755 back together. I was having weak hydraulics and cleaned the screen, changed the filter and installed a new spring and sliding valve in the relief valve. I flow tested the tranny pump and was getting O-5 GPM. I removed the shift cover and installed a jumper hose between the 2 larger steel lines and was still getting 0-5GPM. I disassembled my old tranny pump, the gears were scored badly. I installed a new tranny pump, suction line and all new o-rings. I looked over pressure tubes and looked to be in good shape. I flow tested today and still have 0-5 GPM low-high idle. Im lost on what to do now. Any help will be greatly appreciated!
 
Using a flow rater. Removed line to front pump from clutch housing and plumbed in my flow rater between the clutch housing and front pump.
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I think JDSeller said when you have the shift cover off you can blow air into the tubes and listen for air leaks. Dont start tractor with cover off unless you like cleaning oil off the ceiling. Look him up in the search bar on 2555 or 2755 hydraulic problems. TimS knows a lot also.
 

fordfx413
By stating you replaced spring & sliding valve were you referring to hyd filter relief valve? Have you checked operation of hyd pto & hyd hi-lo at operating temp since rebuild of these clutches?
 
Jim, Yes the filter relief valve. I have the shift cover off right now with a loop hose between the 2 larger tubes. So i have not checked the
pto, mfwd or hi low yet. I just wanted to flow test my tranny pump first to be sure it was working correctly.
 

Well if you're checking trans GPM with shift cover off you have eliminated the hyd pto & hyd hi-lo so they're not causing GPM lose. I can't remember the function of this valve & have no access to utility tractor TM but have you checked to be sure it's seating correctly? Did you try checking GPM with frt hyd pump destroked?

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Yes I did check with pump de stroked and no change. I did
check that the ball is seated correctly also. Could something in
the brake valve be causing this?
 
Your testing it correctly. Did you replace the orings between the housings when you put it back together??? They can leak internally. Not common but they can.
 
The brake valve makes it's own pressure through the pedal, a port lets lube oil keep the valve full,,"But" I have removed the brake valve and found the cavity behind it full of oil filter parts,,blocking the flow to the front pump,,you may want to check that.. I feel your pain trying to sort these out, there are several things that can kill the system.. I have seen and dealt with just about every thing that can go wrong with this style system,,,and that is why I have developed a strong dislike for them,,and why Tannerite is my favorite tool to repair them ;^),, I also get more good out of the "flow into a bucket" flow test...
 
To echo some of Tim's comments, I have seen the rubber gasket come away from the trans filter and get lodged in the tubes blocking the flow to the front pump. Had a chunk caught all the way up at the fitting going into the front pump at one time, but with your test it will have to be closer to the back.
 

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