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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Working on JD 450 Tomorrow

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Tweeter

11-03-2006 17:48:42




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I plan on working on my JD450 tomorrow. The plan is to follow the manual and do the clutch pedal adjustment, HLR adjustment, and steering clutch adjustment. After reading through the manual, it shows the regulator valve for the HLR pressure using shims to adjust. Where can I get the shims and how will I know how many if needed? Also, how do I go about the pressure test? Is there something that screws onto the gauge or do I have to figure something out for attaching?

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Roy Suomi

11-03-2006 20:04:54




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 Re: Working on JD 450 Tomorrow in reply to Tweeter, 11-03-2006 17:48:42  
I've found that a penny is good for about 15 lbs when adjusting pressure valve..I've used them many times when out in the field adjusting transmissions..Take out all the shims and grease them together..Makes it easier to install nut without loosing shims..Get a 200 lb gauge..Install a flex hose from a grease gun..You might also have to install an extension [ 1/8 th pipe ] to clear any obsticles inside the pressure tap casting...Gear transmission in neutral [ between 3rd and 4th gear ] lock brakes down,,start machine and check to make sure you're in neutral there. carefully release the clutch to make sure it's in neutral..Then you can shift the HLR from gear to gear without the machine taking off on you..Adjust the clutch pedal "free-play" [ top of the pedal to where you can feel the clutch throw-out bearing contact the clutch fingers].. 3-3/4"..Adjustable with the 3/4" headed bolt next to the clutch pedal..If when you turn this adjustment and nothing happens except the bolt raises and lowers. That tells me it's a pretty good indication that the linkage on the side of the clutch housing is frozen and needs to be freed up. If that adjustment works OK then pull the rubber plug on the clutch pedal side of the clutch housing [ top of housing ] There you will find a stud with a 5/16" nut [ 1/2" socket]..With the engine running at about 1/2 throttle, check the pressure..Should be about 180 lbs. . Turn the nut clockwise and watch the pressure .. It should go to it's maximum pressure then fall off..When it falls off back it back out about 1/2 turn..Push in the pedal about a half inch and watch the gauge..It should go up slightly [ 5-10 lbs ]..If it does this , you're real close..shift the HLR from gear to gear to check pressures [ remember , 4 speed in neutral ] if the transmission shifts harshly , turn it in one flat at a time while trying the speed of shift..Now put the 4 speed into 2nd gear , brake off , and try it at near idle speed..When it's ajusted properly , you should be able to shift it at wide open throttle without touching the clutch..Don't make it too mushy shifting , trans will heat up from slipping..You should be able to shift it lets say from forward to reverse an it just sucks you out of the seatback..Not a " Neck snapper "..There are several adjustments for this transmission...Try these first and let us know how it turns out..

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Tweeter

11-04-2006 03:49:27




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 Re: Working on JD 450 Tomorrow in reply to Roy Suomi, 11-03-2006 20:04:54  
Thanks Roy, I"ll see what happens.



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