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Allis Chalmers Discussion Forum
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Allis B/C Oil Pressure Problems Transmission Ques

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Brandon P. Webe

05-10-2006 18:23:27




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Well, I got my new tire and rim finally on and have been using my tractor now. As usual, new problems have developed. While pulling stumps the other day, I lost oil pressure. Keep in mind that I had to tear head off of this engine and play whack-a-piston this spring, but didn't touch anything in the oil pan. New oil and filter were used. I drove it back to the barn after losing pressure and it didn't seem to be making any weird noises. I checked the gauge and it works. What're the odds that I just lost prime in the oil pump after having ran it for several hours intermittently versus a more serious problem with the oil pump? The tractor did sit for 2+ years without being ran, but I had good oil pressure to start with. And yes, I used a Fram C159 oil filter per the advice here. And yes, I know the oil pressure isn't much to start w/ and drops when warm, but it was reading zilch. I waited until she was good and cold and tried it again. Still nothing. Any suggestions? Also, since I've had this tractor running, it tends to grind going from neutral into any gear regardless of clutch position or RPM's. Going from one gear to another is no problem though. Any thoughts? As always, thanks for all your help.

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wdtom

05-13-2006 08:42:21




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 Re: Allis B/C Oil Pressure Problems Transmission in reply to Brandon P. Weber, 05-10-2006 18:23:27  
I would guess the gear grinding might be a tight or sticking pilot bearing. Had exactly the problem you describe and had to emery or LIGHTLY file out pilot bushing just a little. Put it together with a little grease in the bushing and on the shaft.



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DOC ADAMS

05-11-2006 04:42:51




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 Re: Allis B/C Oil Pressure Problems Transmission in reply to Brandon P. Weber, 05-10-2006 18:23:27  
IF YOU HAVE THE SAME TROUBLE I HAD WITH MY C YOU WILL NEED TO SPLIT THE TRACTOR AND TAKE THE PUMP OFF THEN LOOK INSIDE THE CAM SHAFT.THERE SHOULD BE A ROLL PIN IN THERE THAT DRIVES THE PUMP.MINE SHEARED
OFF AND I HAD TO PULL THE CAM OUT TO REPLACE IT.I ALSO HAVE A B IN THE SHOP TORN DOWN SO I THOUGHT I WOULD CHECK THE PIN IN IT AND SHURE ENUGF IT IS ALMOST INTO ALSO.I USED A DRILL BIT INSTED OF A ROLL PIN ITS HARDER AND SOLID.GOOD LUCK

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russ1

05-11-2006 04:06:36




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 Re: Allis B/C Oil Pressure Problems Transmission in reply to Brandon P. Weber, 05-10-2006 18:23:27  
The gear grinding may be caused by a bad pilot bearing that is not letting the drive shaft stop when the clutch is disengaged.



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steve(ill)

05-10-2006 19:00:30




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 Re: Allis B/C Oil Pressure Problems Transmission in reply to Brandon P. Weber, 05-10-2006 18:23:27  
there is a steel U shaped tube that goes from the pump outlet pipe (right rear corner of motor) to the filter housing. take the U tube off, and turn it so you can squirt oil from a can down into the oil pump (down the 1/4 inch steel pipe). that should prime the pump. you can also start the tractor and loosen the U tube to check flow, or remove the gauge and check flow, or loosen the small steel line to the head to check flow. pump puts out very little flow, it dont leak much. keep a bucket and a littel kitty litter handy to cleeanup.----- -- grinding in trans is because the clutch did not fully disengage and trans is still spinning. sometimes you got to wait a second before putting in gear. going from gear to gear is usually a little smoother.

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