Questions about our 2010C H-L-R transmission

JamesTrent · Post by **JamesTrent** » Sun Apr 06, 2008 1:41 pm

We just purchased a 2010C and have a problem with the H-L-R transmission. All eight speeds seem to work well until the dozer is put under enough strain (where most motors would start to bog down)then it is like you put it in neutral. We have cleaned the filter element, changed the paper filter and fluid. The transmission shows no sign of slippage it just quits all at once. It will not pull itself until you shift to reverse and then forward works again (until we load it up). Any similar problems out there? By the way Leroy this is the best site I found for "informative" information.

RANDY Fay · Post by **RANDY Fay** » Sun Apr 06, 2008 4:39 pm

This is a long distance guess--but I would say eng. clutch is eather lost all it's free play or is shot once oil presure in HLR drops down it will turn pump as soon a load is present it just slips have fun Randy

JamesTrent · Post by **JamesTrent** » Sun Apr 06, 2008 5:53 pm

That doesn't seem to be the issue because once the machine quits moving I can still raise and lower the blade and the dozer still will not move until you reverse direction. Relief valve maybe?

jdemaris · Post by **jdemaris** » Sun Apr 06, 2008 6:13 pm

JamesTrent wrote:That doesn't seem to be the issue because once the machine quits moving I can still raise and lower the blade and the dozer still will not move until you reverse direction. Relief valve maybe?

It's doesn't work that way. There are two separate pumps and two separate hydraulic systems. One for the blade or loader, and one for the HL-R powershift trans.

JamesTrent · Post by **JamesTrent** » Sun Apr 06, 2008 6:53 pm

I understand that, but they are both powered by the same clutch aren't they?
Between the motor and transmission? The power goes to nothing as if the clutch in my transmission is becoming disengaged. It doesn't slip, it stops, and it doesn't regain power until it is shifted to reverse and back to forward. I can't see that as being a engine clutch.

RANDY Fay · Post by **RANDY Fay** » Sun Apr 06, 2008 7:48 pm

Main hyd. pump is on front of motor HlR pump is in front of transmission have fun Randy

JamesTrent · Post by **JamesTrent** » Sun Apr 06, 2008 8:18 pm

Randy,
Your right about the pumps. So you think the main engine clutch may not have enough free travel? I have the service manual and it gives about four pages of information on how to adjust clutches and valves in transmission. I am going to start with this and if this doesn't work I'll get back with you. Thanks for your input. James

Tigerhaze · Post by **Tigerhaze** » Mon Apr 07, 2008 8:30 am

RANDY Fay wrote:Main hyd. pump is on front of motor HlR pump is in front of transmission have fun Randy

I am a little confused- my 2010C loader has a Cessna pump mounted on the rear PTO for my loader system (I have the rear hoses for a backhoe attachment as well). Is there also a pump on the front of the engine for other applications? It's so tight in there it is hard to see anything up in the front.

RANDY Fay · Post by **RANDY Fay** » Mon Apr 07, 2008 8:46 am

yep i'm wrong dozer had mid mount pumps-- backhoe pumps mount in rear-- got stuck between 350B that won't move and 2010 that won't push sorry bout that have fun Randy

and upon more checking there is some with front mount pumps (may have been factory add on for different app.)

jdemaris · Post by **jdemaris** » Mon Apr 07, 2008 10:04 am

Tigerhaze wrote:
I am a little confused- my 2010C loader has a Cessna pump mounted on the rear PTO for my loader system (I have the rear hoses for a backhoe attachment as well). Is there also a pump on the front of the engine for other applications? It's so tight in there it is hard to see anything up in the front.

The pumps can be in many places. Most 2010 crawlers have a front-mounted, crankshaft-driven, Webster-Electric (early) or Cessna (late) gear pump. A few oddballs use rear-mounted pumps, some have both. The HL-R is totally separate with its own dedicated pump. If you are getting deleyed, or hung-up shifts once it gets hot, you've probably got a lot of internal wear - and no external adjustment is likely to fix it. It's the #1 reason why 2010s and 450s with HL-Rs get sold. But, it can't hurt to check the easy things first.

JamesTrent · Post by **JamesTrent** » Wed Apr 09, 2008 1:32 pm

I have found a problem (if not the problem) with my H-L-R. Seems someone has been in there before and put the bypass valve in wrong(spring on wrong side) and lost the ball out of the pilot valve. Filter screen also gone. Parts on order. When I get it back right, maybe the added volume will keep the clutches from slipping under load.

RANDY Fay · Post by **RANDY Fay** » Wed Apr 09, 2008 2:33 pm

your taking about the accumulator bypass valve--i've never seen that problem and I would have thought with the spring on wrong side-- crawler would not move at all--and I don't want to tear one down and try it eather--pilot valve ball --if i"m thinking about the right one is a detent ball that alines ports for oil flow to clutch packs sure hope your on right track have fun Randy

JamesTrent · Post by **JamesTrent** » Thu Apr 10, 2008 2:16 pm

Randy,
There is another ball inside the port below the pilot valve, acts as a check valve to hold pressure against bypass valve to keep it open. As for why it moves I guess it gets enough flow through the needle valve possibly a little fluid bleeding around the bypass valve. Definitely not working as intended. JamesTrent

JamesTrent · Post by **JamesTrent** » Fri Apr 18, 2008 6:33 am

Thanks for the input everyone. The bypass valve was the issue, also needed minor adjustments to steering clutches. Now it is putting power to the ground, but the motor needs some tuning up. Luckily my buddy is a deisel mechanic. Thanks again. JamesTrent

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