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Allis Chalmers Discussion Forum
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Re: D17 losing hyd oil

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Brian G. NY

11-05-2012 07:48:51
72.10.222.209



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Apparently, the most common loss of oil from the hydraulics is into the differential because of a bad hose or leaking cylinder. However, I am having the same problem you describe and it is apparently due to a bad seal between the 2 compartments. My problem is most noticeable when I use the tractor in the woods where I have very steep log roads. I assume that when going down steep grades the oil migrates from the hydraulics compartment to the PD compartment much more readily.
Mine is a Series II and I was told that later series tractors do not have that seal and the oil flows freely between the two compartments. My experience is that the hydraulics compartment will empty into the PD compartment to the point of causing it to overflow.
I have to drain from it and refill the other periodically which is a PITA but much less so than splitting the tractor.

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Bob Bancroft

11-05-2012 18:07:06
97.73.64.150



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 Re: D17 losing hyd oil in reply to Brian G. NY, 11-05-2012 07:48:51  
On the series IV when they took the old piston pump out of the belly and put a gear pump on the belt pulley drive, if I remember right they did away with the hyd. fill/dipstick. So then maybe the oil level in the old hyd. compartment doesn't have to be as high. I was going to suggest just letting it find its own level. But if the power director over flows, then that's a bummer! I didn't realize the hyd. pump reservoir was that much higher than the PD. How about running an overflow line from the PD fill back into the hyd. fill?

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