Posted by Fixerupper on December 25, 2010 at 11:41:07 from (207.199.205.40):
A week ago I replaced the shaft seals in the clutch pedal booster on the 1086, early 1978 model with open-center hydraulics. Saw the steering pump had a few drips of oil leaking from the center band on the main body so I removed it too and replaced the rubber sleeve inside the pump, hoping to stop the drip. Put it back together and everything was fine for a few hours of running time, then the steering pump started leaking a pretty good stream from around the metal body band. Snugged the bolts in the end of the pump and the leak stopped. Ran the tractor on the Gnuse bucket for a few hours, then on the auger a few more hours and no leaks.
This morn when I started pushing snow with this rig the leak coming from the pump body started up with a fairly good flow, maybe a pint a miniute? Pushed a little more snow and I lost the clutch pedal booster function entirely. Seems like it doesn't have enough oil in it to even disengage the clutch. Drove it in the shop and there it sits until after Christmas.
All other hydraulic functions including the steering work fine. The on-again off-again leak almost tells me there's an over-pressure problem in the steering pump. I do have an IH factory service manual that's very detailed and I used it when I did the seal replacement but I haven't dug it back out to look at the trouble-shooting section.
How does the oil flow direction go? Pump first and then clutch booster? I'm inclined to think something is going on inside the steering pump. Any ideas? Jim
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