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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 450D HLR Help Please

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DLEdwards

02-21-2007 08:53:24




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Hello,
Just bought a 450D. Problem is H to Reverse is very hard and sharp to lock up.
R to H seems ok. About 2 seconds to lock up. Adjusted clutch pedal to 4” travel per tech manual. Adjusted 5/16 clutch valve adjusting nut down until pedal started to pull away from stop. Back out 5 turns. Run engine with pressure gage attached to test port. Turn nut down until pressure reached max. This was about 145 lbs. (H L and R is about 145 lbs.) Manual said to turn until max. keep turning until pressure begins to drop. (Pressure did not try to drop off any, even if I turned nut down past max. pressure 2-3 more turns.) Then turn nut down one more turn. Pedal started to move off so I backed it up slightly to get pedal back at stop. Then, per manual I pressed pedal down ½” to Ύ” looking for a 10 psi increase, +-5 psi. When I press pedal it decreases as soon as the pedal starts moving. The more I press pedal the more pressure decreases. No changes in hard R shift.
Repeated adjustments at 1000 rpm and 1500 rpm. No change.
Repeated the above with pedal at 3-3/4 and 4” free travel. No change.
Repeated with 5/16 clutch valve nut turned down and up more or less. No change Now I go to shift speed valve adjustment on right side of transmission. It is turned out from bottom 2 - 3 turns. I start turning in until I get H to Reverse to shift smooth
1-1/2 seconds. It’s now about 1 turn from bottom. Reverse now seems good.
Problem now is R to H is about 8 – 10 seconds and very soft. Have not tried to push with it. Pressure on gage is low and slow to get to 145 lbs. Had to stop working on it. Will try again this weekend. All this is done cold. 65 degrees. Thanks for any help you can give me. David Edwards

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Roy Suomi

02-21-2007 19:27:40




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 Re: JD 450D HLR Help Please in reply to DLEdwards, 02-21-2007 08:53:24  
The clutch control rod that DLE was refering to runs from the inside of the clutch housing to the HLR control valve..In the clutch housing it's where the adjustment nut is..There's a cast knuckle attached to the rod in question..This rod extends into the HLR case to the clutch control valve near the back end of the HLR manifold..On this rod are 2 pins , 1 is a groove pin [ solid] and the other is a roll pin..

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Don K.

02-21-2007 16:33:24




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 Re: JD 450D HLR Help Please in reply to DLEdwards, 02-21-2007 08:53:24  
I had the same problems, making adjustments with the pressure gauge did no good. Spent a lot of time and money, removed the engine twice. Turned out it was the clutch control rod was worn.I had drilled it out and repinned it but when I finally got a new one it was about 3/8 inch off. Save yourself a lot of trouble and first check all the linkages and make sure they are where they should be.



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DLEdwards

02-21-2007 17:30:25




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 Re: JD 450D HLR Help Please in reply to Don K., 02-21-2007 16:33:24  
Don, Thanks for the information. That"s my luck, to tear something down twice and it was something simple. What are you calling the control rod? I have a 450D, after looking at the pedal adjustment linkage drawings for a 450C and a 450D they are similar but not exactly the same. Inside the bell housing it looks the same. I need to check the control rod. Where is it?
Thanks,
David Edwards

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Roy Suomi

02-21-2007 14:57:10




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 Re: JD 450D HLR Help Please in reply to DLEdwards, 02-21-2007 08:53:24  
You need to get it up to where it should be[ 185 lbs]..Are all ranges identical pressure or is one lower than the others??? When you adjust the pedal [ 3-3/4 to 4" ] does the bolt go up and down off it's detent plate?? or does it stay down against the detent plate on the pedal assembly?? This makes a difference..If it's ok and free to work properly we go to next step..With a gauge in the hlr port [ on the trans top cover between steering levers ] Look for a drum bung looking plug , remove it and insert a 3/16" allen with a dab of grease on it to remove the 1/8th pipe plug..Install a clean grease gun hose with a 200 lb. gauge on it . Lock down the brake , Feel around for the neutral position on the 4 speed shifter [ between 3rd and 4th gear] . Carefully release the clutch pedal to be sure you're in neutral . Start the machine and read the pressures in all 3 ranges..They should all be even and consistant..At 185 lbs.. If you need to raise the pressure , on the top of the clutch housing ,there will be 2 rubber plugs , of course you know the left one is the adjustment and the right one is the pressure control valve..Pull the pressure control valve nut , again use a greased socket so it stays with the socket, carefully remove the plug and watch for shims in the plug and on top of the spring..I use copper pennies to adjust the pressure up..One penny is good for about 10 to 12 lbs....If the pressures aren't consistant you have an internal leak..Manifold , rings , clutch pistons..All speeds should be about the same lag time between shifts..If one isn't as fast as the others, either the linkage needs to be adjusted so the internal detents jive with the shifter quadrant..If shift quadrant and detents jive , you might have that leak....

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DLEdwards

02-21-2007 18:02:48




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 Re: JD 450D HLR Help Please in reply to Roy Suomi, 02-21-2007 14:57:10  
Roy, Thanks for the information. I have a 450D. I looked at the 450C linkage drawings on the John Deere parts catalog and the 450D pedal linkage is similar but slightly different than a 450c or 450B, it has a turn buckle rod to adjust the pedal. The pedal stops against a slot in the floor plate. In drawings, the linkage looks the same on the inside of the bell housing. I have the gage hooked up now. I will raise the pressure and check to see if H L and R have the same pressure. I will check the clutch linkage and shift linkage. Then I will repeat the clutch adjustments in the tech manual again. Thanks For Your Help,
David Edwards

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rick roberts

02-21-2007 13:52:43




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 Re: JD 450D HLR Help Please in reply to DLEdwards, 02-21-2007 08:53:24  
I am no help - however I await others who may have advice, because I have some of the same symptoms of a hard f-r shift in my 450c. It also seems to take a few seconds to begin the shift after moving the lever. I have not gone over the adjustments as of yet.



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