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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

450D HLR Trouble

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DLEdwards

03-13-2007 06:14:25




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With help from this forum and a service manual, I got the HLR clutch and shift speed adjusted. Thank you. The first hour everything is great. Then it seems like it may slip a little. After two hours sometimes when I go to H or R it may not do anything. L is still good. I can push the clutch pedal in for 5-10 seconds and out then it will go again. Or run in L then go to H or R and it may work. Pressure cold is 180 LBs at 1200-1500 RPM for L, H, N, and R. Pressure with transmission hot is L,N, and R 110 LBS. H is 75 LBS. What is an average cost for John Deere or another shop to rebuild the HLR clutches? Could the problem be something besides the clutches?
Thank you,
David Edwards

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Roy Suomi

03-13-2007 17:44:24




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 Re: 450D HLR Trouble in reply to DLEdwards, 03-13-2007 06:14:25  
Does the transmission work correctly after it cools off again ?? If so, the trans. probably needs to be rebuilt..If the trans doesn't shift right without readjusting the HLR in the clutch housing,,,,, The rear roll pin on the clutch shaft that operates the clutch valve spool might be about sheared off..Can be repaired by pulling top cover off , lube line over upper valve assy and removing upper valve assy...I use a rag packed around the pin area or a strong pocket magnet to keep roll-pin pieces from falling into trans case....

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Roy Suomi

03-13-2007 17:34:05




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 Re: 450D HLR Trouble in reply to DLEdwards, 03-13-2007 06:14:25  
I would think the leak would be in the manifold and sealing ring area of the clutchpack assembly, or piston seals..Another place to look is the o-ring on the pressure tube from the front wall of the HLR housing to the manifold .One on each end...Sounds like a tear-down , sorry...It takes roughly 18 to 25 hours labor to rebuild a HLR...The actual presswork and piston rebuild is about 3 to 4 hours itself....

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