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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

jd 450 c

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vwnjr

10-26-2005 06:06:07




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MY 1980 J.D.450 C IS SLIPPING MORE IN FORWARD AND REVERSE AS IT IS GETTING USED A LOT. DOESN'T SLIP ALL THE TIME BUT IT'S BAD WHEN BACKING UP. SLIPS SOME WHEN PUSHING, SEEMS IF I'M WORKING THE SIX WAY BLADE WHEN PUSHING A LOAD, HAS SOMETHING TO DO WITH IT. AT ONE TIME I WAS TOLD HERE, WHAT THE PRESSURE SHOULD BE ON THE CLUTCH PACKS BUT I'VE MISS PLACED THE INFO. ALSO, I'VE FORGOTTEN IF THE TRANS. AND CLUTCH PACKS HAVE THEIR OWN PUMP OR IF THE FRONT PUMP SUPPLIES THEIR PRESSURE. THANK ALL OF YOU IN ADVANCE FOR YOU HELP. vwnjr

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Roy Suomi

10-26-2005 16:41:26




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 Re: jd 450 c in reply to vwnjr, 10-26-2005 06:06:07  
Hydraulics and transmission are separate systems.. If the transmission is slipping, adjust it.. first.. The speed of shift and pressures can be tested as follows; pull floorboards , find the "drum bung" on the top of transmission case cover, between steering levers.Remove drum bung , there you will find a 1/8th pipe plug in there on an angle. I use a dab of grease so the plug sticks onto the allen wrench [ 3/16" ] an doesn't fall off when removing..I use a grease gun hose with a 200 or 300 psi guage attached to it. Screw the hose into the hole you took the pipe plug out of. Place 4 speed shifter between 3rd and 4th gears. [ there is a neutral position there.] Start machine with brake lock engaged. run engine at 1200 t0 1500 rpm. Slowly release the clutch pedal to make sure you have the gear transmission in neutral [ with hlr transmission in gear]. read the pressure on the guage. It should read approx. 185 lbs. If speed of shift was real aggressive between forward and reverse thats a good indication it's out of adjustment. you should be able to shift the HLR transmission at wide open throttle without using clutch pedal. If pressure reading is low you can adjust the speed of shift and pressure reading at the same place.First adjust the pedal freeplay, this is where you shut off oil in the clutchpack transmission. If you take a tape measure from the top of pedal stroke to where the throw-out bearing contacts the clutch pressure plate. There is a upright bolt next to the clutch pedal that adjusts the freeplay. Should be 4 and 1/4". . If you look at the clutch housing below your left foot , you will find a rubber plug about 2 1/2" in diameter. pry out the plug. Inside you will find a stud with a 5/16" nut [ 1/2" deep socket size] while running at the above rpm turn the adjustment nut down[ clockwise]. As you turn the nut you will eventually see the pressure rise. keep turning the nut till the guage stops rising. At that point turn it a little more clockwise , the pressure will begin to drop. The adjustment is close if you can push the pedal 1/2 to 3/4" and pressure rises slightly, back to where the maximum reading was.You can then do the speed of shift fine tuning now. With the gear transmission in 2 nd gear , engine running just above idle speed , sit in seat put the HLR lever in gear, Lets say high range, pull the lever into reverse. It should shift smoothly without whiplash. If it's still aggressive turn the 5/16" nut clockwise 1/4 turn at a time till the trans shifts smoothly. All shifts forward to reverse should be tight but not painfull. you should just be " sucked out of the seat" lightly when doing this shift. You can fine tune it to your preference. If you want it more smooth turn it clockwise. If it's too slow turn it counter-clockwise. The pressure should read 175 to 185 psi. If it shifts ok but pressure is down slightly you can use a penny or two to shim up the pressure control valve. Each penny is good for about 15 lbs.

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vwnjr

10-26-2005 18:38:49




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 Re: jd 450 c in reply to Roy Suomi, 10-26-2005 16:41:26  
THANK YOU VERY MUCH ROY. THIS IS JUST WHAT I NEEDED, I HOPE. I'M HOPING THAT THINGS HAVEN'T SLIPPED SO MUCH THAT THIS WON'T HELP. BUT AT LEAST I CAN TRY TO ADJUST IT NOW. AGAIN, THANK YOU ROY.



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drk

12-03-2005 07:54:57




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 Re: jd 450 c in reply to vwnjr, 10-26-2005 18:38:49  
Thanks for me too Roy. Had taken my 450C to a local mechanic to get steering clutches and some other things done including speed of shift. The speed of shift was so aggresive it would almost break your neck. After about 2 months now he has fixed everything but the speed of shift. He says that he has adjusted everything according to the book, but the shift is still the same. Is it that he doesn't know what he is doing, or could there be something in the clutches or the accumlator that is causing this problem.

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