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Crawlers, Dozers, Loaders & Backhoes Discussion Board

Re: JD 450D Differential

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Posted by roy suomi on May 04, 2014 at 21:14:39 from (

In Reply to: JD 450D Differential posted by 4020guy on May 04, 2014 at 09:26:12:

There are 2 shafts each driving the final drives.. I wonder if it snapped the inner [ much thinner ] shaft off.. Does it drive at all ?? one side or neither ?? If you need to pull the ring and pinion out.. Start at the front and work your way to the rear of the machine.. When you have the center rear section out, there will be nothing standing in the machine but the engine main frame rails...I wonder if something happened to the pump circuit causing a no drive situation.. One way to tell what's happening is to install a gauge into the HLR pressure port and run the machine to see if it actually makes any oil pressure [ 155-185 lbs].. If it has pressures in all ranges, block the front of the tracks , jack up the rear and block under the sprocket/track, remove the PTO shaft or if not equipped with PTO , pull the cover off and have someone try to operate the machine.. With a flashlight in hand look in there for movement..If the ring gear turns, but nothing drives the final drives.. Either the inner shafts are broke or the steering clutches are slipping/not driving.. The transmission and the steering clutches both operate off the same transmission pressure..


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