stright 450 dozer with HLR

Rustyslater · Post by **Rustyslater** » Sat Nov 10, 2012 3:50 pm

Well I got the steering clutches changed and the one bad final drive changed out. Got her all back to gather, cranked her up tracked it back and forth a few times. Then I pulled a steering leaver dozer stopped. Dozer would not steer left or right if you put any kind of load i.e.; breaks or blade it would stop the tractor. Trans fluid level is good with new oil and new filters. I checked the oil pressure on the trans as per the JD manual oil pressure was 100 psi in neutral about 95psi in any gear or HLR. old dozer will not move. My question is how much pressure is too little to hold the clutches in the HLR engaged the book says that the pressure should be 145. I am under the impression that the HLR clutches are smoked. But I find it funny that it will not do anything high low or reverse. I would appreciate any and all questions, comments, or advice on this subject.

ib4hoyt · Post by **ib4hoyt** » Sun Nov 11, 2012 1:36 am

id like to help you, but in not up on straight 450s

oljoe · Post by **oljoe** » Sun Nov 11, 2012 9:39 am

My suggestion is to check the steering clutches again. When I worked on mine I adjusted them per specs and the left side was slipping. I adjusted the pressure plated throw out bearing so that I knew that it was fully released then it would pull.
Joe

Rustyslater · Post by **Rustyslater** » Sun Nov 11, 2012 11:37 am

checking the steering clutches was the first thing i did. Is a hundred psi enough to hold the hlr clutches.
I sent the parts list to rebuild the pump and the hlr clutches to be priced out it came back about $2500 that was from mother deer.

jtrichard · Post by **jtrichard** » Sun Nov 11, 2012 1:56 pm

you may have done this already if not pull the steering box covers and see if the clutch drums are moving or not when it stops with load

vestor_guy · Post by **vestor_guy** » Sun Nov 11, 2012 7:26 pm

If I remember correctly, about 60 psi is required to initiate the shifting process. The pressure should be 145psi.

Rustyslater · Post by **Rustyslater** » Tue Nov 13, 2012 9:07 am

yea i the steering clutches are not spining and the engine is not loading up it is I almost thought that engine clutch was slipping. I pulled the motor out the engine clutch looks to be good not been slipping. A little back story when I bought this dozer in a non opertating condition. steering clutches were stuck and one final drive was broken i re built the steering clutches and changed the final drive. Now it will not track in any gear

vestor_guy · Post by **vestor_guy** » Tue Nov 13, 2012 11:28 am

It looks like your HL clutch disks are spinning. You can attempt to raise the pressure by adding shims under the relief valve. Make sure the filter is not plugged. If you cannot get the 145 psi, you either have a worn pump or are losing too much oil in the HLR.

If you have the engine out, the first thing I would check is the condition of the transmission pump on the face of the transmission. If that is good and shims don't help, then the problem is likely to be in the HLR.

Rustyslater · Post by **Rustyslater** » Thu Nov 15, 2012 8:51 am

I forgot to mention
I did try putting shims it did not change
Pressure at all. I pulled the motor to look at
The pump might as well pull the hlr clutches too

vestor_guy · Post by **vestor_guy** » Thu Nov 15, 2012 9:30 am

OK, shims did not increase the pressure so the pump is worn or you have a substantial leak in the HLR.

If the clutches in the HLR have been slipping for very long, it may have damaged them even if the initial problem may have been the pump.

Rustyslater · Post by **Rustyslater** » Thu Nov 15, 2012 9:35 am

That's what I was thinking just wanting to
Make sure I was on the right track

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