450C hydraulic pump not turning

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NWJD fan
440 crawler
440 crawler
Posts: 154
Joined: Wed Apr 13, 2011 10:19 pm
Location: Dease Lake B.C.

450C hydraulic pump not turning

Post by NWJD fan » Wed Dec 19, 2018 10:29 pm

Hi. Trying to bust through a windrow of frozen dirt and logs with my 450C manual outside dozer today. After winching a log out of the mess went to lift blade and nothing happened. Oil was visible in sight glass, no unusual noise. Looked at pump drive, splined drive shaft turning very slowly, something has stripped out. Is there a usual failure mode in this situation? Does the pump shaft strip or is it the engine drive adapter that fails? Does not have the disengage feature like the 350's.

JWB Contracting
2010 crawler
2010 crawler
Posts: 597
Joined: Thu Aug 27, 2009 10:08 pm
Location: Edmonton, Alberta

Re: 450C hydraulic pump not turning

Post by JWB Contracting » Wed Dec 19, 2018 11:45 pm

Your drive coupler is stripped. Pull your hard nose so you can check if your pump is spinning freely and if so replace the coupler. Will fit off your parts 350. Your pump should be the small / low volume one which is not very common. I believe there are 2-3 pump sizes available. We have lots of the large aftermarket pumps which would work but your hydraulics will be very fast.

We don’t have enough snow here in Edmonton to even push with a Dozer.
Jason Benesch

John Deere 420, 430, 440 & 350C With 3 Point Hitch
John Deere 400G With Winch
John Deere 2010 Crawler Dozer
John Deere 420, 430, 435 & 440 Wheel Tractors

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