VAC Case hydraulic issue

beercase · Oct 24, 2018

I've owned my 1950 Case VAC for 42 years and it runs like a top. Recently rebuilt the hydraulic pump. The garter spring on the old seal wore a groove in the shaft causing it to push hydraulic oil into the crankcase. Fixed with a Speedy Sleeve and that went great. The depth control/valve which operates the 3 point hitch is very erratic. I disassembled it expecting to find some broken, binding or stuck parts. But it all seems to be fine. Does the system need to be bled? I figured that the air would work itself out by now. When I did the pump I drained and flushed and refilled the reservoir. There is no filter in this system. Everything was surprisingly clean. If the hydraulics need to be bled, what is the correct way to do it? Thanks!

Glenn F. · Oct 24, 2018

Isn't there a filter in the bottom of the torque tube? My '54
has one.

Joe (Wa) · Oct 24, 2018

VA tractors s/n 5370499 to 5458363 with torque tube casting nr VT596 was not cast for a return oil filter.

The pump if it is in decent shape is self primping but the pumping spur gears must be wet. Remove both the inlet and outlet lines on top of the pump, fill both ports with oil, let settle and add oil till the pump is full. Reattach lines, make sure the inlet fittings are tight, so it doesn't suck air. The rest of the system will purge any air as the hitch is operated.

Joe

beercase · Nov 25, 2018

(quoted from post at 18:17:07 10/24/18) VA tractors s/n 5370499 to 5458363 with torque tube casting nr VT596 was not cast for a return oil filter.

The pump if it is in decent shape is self primping but the pumping spur gears must be wet. Remove both the inlet and outlet lines on top of the pump, fill both ports with oil, let settle and add oil till the pump is full. Reattach lines, make sure the inlet fittings are tight, so it doesn't suck air. The rest of the system will purge any air as the hitch is operated.

Reply (beercase)
Thanks for your help. The job went fine. I put a new o-ring in the valve and filled the pump with oil then hand cranked the engine a little bit to turn the pump to make sure the air was purged. I bought my VAC from my uncle in 1976 who bought new in 1950 the same year I was born. I use it to plow my driveway in winter (Wisconsin) and a few other little jobs around my place. It runs like a top and is a lot cheaper ($500) than those tractors they sell now. Thanks again.

Joe (Wa) · Nov 25, 2018

Thanks for the feedback beercase, may help someone that has the same issues down the line.

Joe

VAC Case hydraulic issue

beercase

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Glenn F.

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Joe (Wa)

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beercase

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Joe (Wa)

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