HD11ep No forward?

I have an HD11ep that sat for over 10 years at the farm. Got it running again with a set of new batteries. After clearing about 15 acres over a course of time it became more and more difficult to get the dozer to lock into gear even after warming up. It would make the initial shift but be very weak and unable to move. Revving and shifting in and out of gear would eventually get both forward and reverse working properly. Eventually one day i was unable to get forward one or two. I did a complete fluid and filter change hoping to correct the problem. The dozer now functions perfectly in reverse with no fighting it however i am still unable to get forward other than the initial small surge when placed in gear.

Any help would be greatly appreciated. Thank You

Edited by JMDupre - 11 Jan 2013 at 2:05pm

Did you check your transmission streaner he could be plug and transmission is missing oil

The hoses going from the shift lever to transmission are the transmission clutch pressure lines.  If you are looking at the transmission from the front, the forward clutches are on the left, and the reverse clutches are on the right.  (Catch here- later models only, early models are the opposite, around 11500 serial number if I recall- this has been brought up on earlier threads.)

I use John Deere Hy-Gard transmission oil in our Allis.  Regular grade- the viscosity is 10W30.  Book calls for 10W oil, or ATF in cold weather.  I know some won't agree with me, but I shy away from ATF- too light in my opinion for these old worn out transmissions. Or, look for an engine oil approved for operation in Allison transmissions (not all are), 10W30 grade.  Shell has a neat website called LubeMatch, where they recommend oils for all kinds of machines.  Under 11-B they recommend their T1 30W engine oil for powershift transmission.

Thanks for the information everyone. I will start checking today. I am running 303 Hydraulic fluid in the transmission and final, SAE 30 in the motor, and whatever was in it 30 years ago in the rest. I asked around and assured by CAT it would work fine. If I need to drain out the 303 let me know and tank every one for the advice so far. I will keep posting till its fixed.

The seal rings are most likely the same style as the clutch release seal rings in my 7G, a nylon quad ring.  Mine had worn from sliding friction and had degraded to where they would not hold air pressure, I could hear it blow thru into the clutch housings when checking for leakby when my tractor quit steering.  These are also a hydraulic supply style of ring so a hydraulics shop may be able to come close for a replacement if no one else has in stock.  The biggest failure to locate for me is the shift shaft seals for the clutch packs in the external support housings, no longer made and harden over time.  I am fairly certain these are self-destructing in my little tractor but I am afraid to tear into those should I not be able to obtain a suitable replacment.  My hydraulics supplier said he 'might' be able to come up with something to replace them, might not.

Like I said I changed all the filters and fluids on the tractor and have 303 in everything but the cooling system and motor oil. I did not drop the belly pan so the trans screen could easily be stopped up just dont wanna run around in circles.

I did find a leak at the main filter I gotta tighten up so ill tighten it up and get another set of gauges and hook it and the TC up this evening and see what everything says then post it. If I have the time ill go ahead and drop the belly pan too.  

Ok dropped a skid plate and the trans pan, pulled and cleaned the trans screen. It was about 80% stopped up. Ill post when its back in (Most likely tomorrow). Gonna look for the the other screens too. Thanks for all the help so far.

Well, Getting tired of working on it for sure but I gotta get it up and running or replace it soon. Screen is back in and still low forward clutch pressure. Guessing I need to: B) Pull the relief valve

Forward pressure reading are 110psi Trans Clutch Apply and 40psi Trans Clutch Lube. Readings are the same but switch with both forward gears. I believe this tells me that there is leakage in the pack or shaft. Which Im assuming is my problem...

for what its worth guys. The powershift clutch pack componetry was made for AC by the rockford clutch company. Which is part of borg warner. Whether any parts are obtainable through them i don,t know. But is another avenue to look at. Clutch pack componetry is same for IH too, also rockford clutch. As was told by a very knowlegeable source 11ep/B and TD15B/C clutchs are the same