AC HD20 TORQUE CONVERTER ISSUE?

HELLO, I AM NEW TO THE FORUM. I AM NEEDING SOME POINTERS ON A ALLIS HD20 DOZER WITH THE 6-110 DETROIT. THE DOZER WAS FOUND IN A BARN THAT HASN'T BEEN OPEN IN SOME YEARS. I AM IN THE PROCESS OF TRYING TO GET THIS OLE GIRL OUT AND ON A TRAILER TO TAKE HER HOME WITH ME. IT HAS SAT FOR AT LEAST 14 YEARS. AFTER GOING THROUGH FUEL SYSTEM I MANAGED TO GET IT RUNNING OFF A AUXILIARY FUEL TANK MOUNTED ABOVE ENGINE. STEERING CLUTCH RESIVORE WAS DRY OF COURSE SO AFTER ADDING LOTS OF FLUID I CAN FEEL SPOOL VALVES OPERATING AND SUCH. EVERYTHING CHECKED OUT OK SO I ATTEMPTED TO SEE IF THE TRACKS START TO SQUEAK, THREW HER IN 1ST ENGAGED CLUTCH ENGINE IDLED DOWN AND DRIVE SHAFT MOVE SLIGHTLY. I THEN UPPED RPM AND DRIVE SHAFT MOVED A BIT MORE AS IF ITS TRYING TO TRANSFER POWER BUT NOT EVEN THE SLIGHTEST BUDGE ON SPROCKETS OR TRACKS I TRIED 2ND AND REVERSE GEARS AS WELL WITH NO LUCK. 

I am thinking the HD 20 torque converter used diesel fuel for a fluid. I am not sure just how it was plumbed but it may not want to go, working from a small tank just hung on it. Not saying for sure it does, but I think some did use diesel.

As I remember the restricted fittings in the Jimmies they were in the head where the fuel exits to return to the tank and externally look like a common brass fitting. They provided the regulation to control the fuel pressure. Different engines and different tuning used different fittings with different orifice sizes. Still got a couple different ones in that special, must save, drawer in my tool box. What does the restrictor you took off look like? Possibly a little housing with a bunch of wafer plates inside it? I took a quick look on Minnpar's site and didn't see a parts manual for the HD 20 with a 6-110, will have to look more later.

Ok..also concur with Jim's comments..not sure how you have plumbed the temporary tank? But the fuel needs to get through the converter to work.

YES IT USES DIESEL FOR COOLING. THE RESTRICTOR ON THIS ENGINE IS A SMALL CAN THAT SEPARATES AND HAS I METAL SCREEN AND THEN A .060 SIZE JET THAT SCREWS INTO THE BODY.

Diesel not for cooling for actual driving/operating fluid, that was the part I was trying to remember how worked.

I'm wondering if the drive shaft really has any torque in it.  Maybe wrap a belt or rope around it and tie it to something and gently engage the clutch.  If it tightens up the rope, you have other problems, if it does't turn, the probably the problem is in the  torque onverter

Out here working on the Dozer today. Here's where I'm at..... verified I have no air end primary fuel filter and fresh fuel supply fired up engine with secondary filter cracked and a few air bubbles come out then closed it off. Now keep in mind I just reinstalled my return filter restrictor that was completely clogged originally take a look at fuel pressure gauge and was reading 0 waited a few minutes and needle started bumping up and came up to about 40-50 psi. Left Transmission in neutral and engaged clutch to let drive shaft free Spin and fuel pressure dropped back down to 0 then slowly came up to around 40. Put transmission in first and re-engaged clutch engine idled down and I gave it some throttle drive shaft moved slowly about 90° like it might have been trying to pull let it run varying throttle for around 30 seconds or so returned back to idle still in first gear and clutch engaged and fuel PSI went down to 20 lb then i shut it down. Just curious do I need to let converter spin drive shaft in neutral for sometime to get fuel flow and build up pressure? I doubt 20 lb is enough.

Well I fired it back up and let converter spin in neutral for a few minutes I then put it in gear and Davidson throttle for 30 seconds or so I pulled down on both steering clutches a few times and let him go and all of a sudden pop she starts walking right out. I drove it out approximately 20 ft to see if it will steer and it didn't really want to but did not try the band brakes while operating steering lever either I backed it back in and shut it down couldn't believe it. Everything seemed really smooth when going forward and backward. This thing Hall's but in first gear if you wanted it to can imagine 2nd gear. Once I get main tank hooked backup I will test steering clutches more and see if Band Breaks will help steer it I have about 1/2 Mile Drive through the woods and a few turns through the trail to get it to the pasture.

CAL(KS) wrote: thats great.  they wont steer well without a load you will need to use the brakes.

Thanks I just figured that out by pulling back on the steering clutch and tapping brake.

Sorry about the double pics above. Just wanted to show you guys taking a peek of daylight

Edited by calvin long - 26 Apr 2019 at 6:02pm

Judging from the gouge you got it moving!! Now would be time to get that winch functional to drag that nose Up!

It'll sure take you a long time to build a pond with that monster of a blade.    Hope you get her going good. Everything I see looks good.. Good luck with her

Congratulations on your new find. It’s fun working on a unknown tractor and making her move again.

interesting it uses a slave cylinder to operate the winch.  even into the 60's the front hydraulic units and M100 front cable controls used long mechanical rods