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jdemaris
05-19-2004 20:18:11
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Re: jdemaris-cannonball -others JD 410 TLB in reply to LENRAY, 05-19-2004 17:11:25
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To remove - on a farm tractor easiest way is to pull the front end off and remove pump from the bottom. With the hoe, best best is probably to pull the radiator and take the pump out from the top-front. Some hoes you can just barely squeeze the pump out with the radiator in, but it's close. The pump is fairly simple to work on. Even easier if all you want to do is fix the leak. The shaft in the pump rides in adjustable Timken style bearings. The shaft has two oil seals. The one on the outside is a dust and residual oil seal - NOT a high pressure oil seal. The high-pressure oil seal is inside the pump, and the pump must be removed and taken apart to replace. You must buy a new seal kit for the pump, you will need all new o-rings and seals because the pump must be taken completely apart. Remove pump. Then, take out the eight big piston plugs that circle the pump. It is advisable to mark each cap and pump housing next to it, so the old parts can go back in the same place. Main issue is, after removing the caps, and springs, you then stick you finger in hole and pull out each piston. These pistons ought to go back in the bore they came from simply because they are worn, and the wear will match the bore they've been in. Now, check, with the eight pistons and springs out, check the splined input shaft for end-play. If it does not feel loose fine. If it is loose, it will need to be tightened. If you can put a dial indicator on it, some guess work will be eliminated. Should have .002-.004" end play. So, let's say you find it has .008" end-play - then you'd need a .006" shim to tighten down to .002" end play, etc. Next, take the four bolt cover off of the pump. The bearing shims are there. Once the cover is off, pull the pump shaft out. Then, on the seal side of the pump, a snap-ring holds in the external low-pressure oil seal. Deeper inside, is a square sided o-ring with a teflon backup washer. That is the high-pressure seal. Replace and tighten things as you put it all back together with new seals and o-rings. The eight piston caps get new o-rings on them, and then teflon sheaves over the o-rings. That's because Deere had problems with those o-rings getting cut when tightening the caps.
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