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Max
07-20-2002 08:19:02
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Re: Re: Re: Re: Re: CASE 450 B DOZER in reply to Steve, 07-19-2002 19:36:32
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You got the tube back in correct for it always goes down. On the linkages, I always used to get away with pulling the clevis pins, clean, lubricate, and reinstall with good results. I used to reinstall with neversieze. Stall speeds, the best way to describe it is first you check the high idle speed with all controls in neutral and this should be around 2130-2170 rpm, then you hold the hydraulic control until the cylinder bottoms or extends out on the tilt circuit for dozers and bucket dump for loaders. Now the rpm should drop to 2000 rpm. Note; this should be done with the hydraulic oil at normal operating temperatures of around 150 degrees, warm to touch on the metal hydraulic lines. Then with the trans in high/high, parking brakes on, the engine should only rev to 1830-1930 rpm. Then if you should put the same hydraulic circuit over relief again with transmission stalled, the rpm should drop to 1180-1380 for loaders and 1380-1580 for dozers. During this part of the test, I would also have the main transmission pressure port tested. You should notice a slight drop in pressure but then the pressure should go back up to where it was at neutral +/-15 psi. I take it that you have checked the pressure at the top port of the transmission control valve on top of the transmission. You can tee into each clutch pack port and at low then high idle you may see a difference of pressures which would indicate either a leaking clutch pack or seal rings under that cap. Sometimes you can get lucky and find a broken sealing ring under the cap and fix it but that was rare. If you take the caps off, don't loose those shims, those control the end play in the clutch pack shafts. I used to use Hydraulic loctite to seal the shims and prevent leakage there. The only safe way to check these transmissions though is with a flow meter. That way you can pinpoint the leak whether it be a clutch pack, PTO clutch pack, or even a control valve gasket. That transmission is simple but is very detailed when servicing. I used to use the 850 service manual for overhauls since the 850 had tighter tolerances for the same transmission. Hope I didn't confuse you to much.
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