hd4 dozer no reverse

Hello everyone. New to the board and just picked up a late 60's hd4 with a 6-way and ripper. Over all its in good shape but reverse went out semi suddenly. Forward works fine but not reverse. It started out that reverse was working, then it started to not engage on steep inclines so i thought ut-oh the clutches. But i did a little research and tore into the shuttle shift valve body and found a glob of silicone in the bottom of the assembly and a busted retaining washer on the rod that goes into the spool assembly. I replaced the retaining washer with a c-clip and cleaned oit the silicone and reverse worked like brand new! Well that lasted for the day and then all of the sudden no reverse. Does anyone have any idea what dirrection i should be looking now? I am thinking of trying to drain and flush the system to see if there is more of the mystery silicome plugging a line. Not sure if anyone else has run into a similar situation. Thanks for any help or ideas. I am really hoping i am not looking at splitting this sucker.

Tracy here is the ripper set up. Tore the side cover off the converter resevior and only had 1 out of 3 o-rings on the lines there and a glob of blue silicone. Thought i might have found my problem. Put it back together and it worked for a second the no more reverse again. guess i will be back at it when it stops snowing.

sweetlogs wrote: Tracy here is the ripper set up. Tore the side cover off the converter resevior and only had 1 out of 3 o-rings on the lines there and a glob of blue silicone. Thought i might have found my problem. Put it back together and it worked for a second the no more reverse again. guess i will be back at it when it stops snowing.

 Check the fluid level in all the compartments. If reverse worked for a second, did the hydraulic fail or did it come out of gear? Could be reverser pack isn't holding. With the missing Orings and blue stuff, someone has had the problem before. How strong did it move in reverse when you fixed the oring issue? Do you hear a gear grind of any sort? Tracy Martin

Fluids are all full. reverse worked enough to power through holding both brakes. It feels like its not fully engaging in reverse though. When i put it in fwd it slams in. not a painful slam but you can feel it connect. in rev it doesnt do that. the fluid also isnt burnt smelling and is red not fouled like i would expect with say a burnt plate. but i am only saying what i would expect to see with an auto from a truck or car not a piece of heavy equip. i am open to all ideas at this point. i am 10mi up in the mountains and have very limited internet for research so any ideas a very much appriciated.

Could be a leak internally. I would check the HYD pressure. Does your dozer have a decellarator pedal? A previous owner could have changed directions without lowering engine RPM. If it is strong in reverse, when it does reverse.I suspect your clutch pack is loosing pressure. Due to the actuator not holding it over center. HTH Tracy Martin

Edited by Tracy Martin TN - 22 Mar 2013 at 11:00am

no there is only the 2 pedals and the 2 steering levers.

Well i took the converter resivior off and had a looksee at the shuttle. Found a busted ring in the bottom of the case. So here goes the fun of splitting this sucker in half. Found the master pins welded so this is already starting out fun. Thanks for the help guys. I will post what else i find once i get it apart.

Ok got the parts in and its back together but now it wont move at all. Is there a step i may have missed putting the shuttle in?