Farmall H, HV & Super H, 1939-1954
Mon Sep 06, 2010 11:57 am
Can the input shaft seal be replaced on the hydraulic pump on a H/M without tearing the pump apart?
Mon Sep 06, 2010 9:25 pm
yes and no. LOL The big problem is unscrewing the drive lug. You will need to drop the pump, and remove the pump from the housing. Pump forms rear wall of housing. Once pump is out, insert piece of flat steel into the oil intake so it wedges the gears and keeps the shaft from turning. Once this is done, you can , if you are lucky, unscrew the drive lug, then replace the seal.
Tue Sep 07, 2010 8:10 am
Is this a right handed thread? A 36" piece of angle iron wouldn't do it.
Wed Sep 08, 2010 7:48 am
If memory serves me correctly it's left hand thread and was not at all hard to remove...
Wed Sep 08, 2010 8:21 am
DanR wrote:Is this a right handed thread? A 36" piece of angle iron wouldn't do it.
I had to dig out a manual to check, but it is a right hand thread, turns to the left to unscrew. On ours the spring that returns the lever to neural when the pump reaches maximum pressure broke many years ago and the end of it went through the pump. That spring is pretty tough and actually took little pieces out of the edges of the pump gear. When I tried to replace that seal a couple years ago I made a tool using a grade 5, 5/8 bolt and used my big impact wrench. After I broke the bolt I bought another pump from JP Tractor, installed a new seal in it, and put it in. Look at the pump gears through thew oil intake, and if you see some chips out of the edges of the gear you may have the same problem.
One note, the manuals show putting a brass or soft steel bar against the corner of the drive lug, and using a hammer to loosen it, driving it in the direction to loosen it. The shock will help break it loose.
Wed Sep 08, 2010 8:26 am
Thanks John, I'll try the hammer and brass first then the impact if needed. I think there was just enough bend in the angle iron to minimize the torque.
Sun Sep 12, 2010 6:46 am
No luck so far. I'll weld up a key tomorrow. Will the pump from an M fit in the H ?
Sun Sep 12, 2010 9:58 pm
Complete housing will not fit. do not know if you can put an M pump in the H housing.
Tue Sep 14, 2010 6:53 am
Thanks John. The impact wrench did the trick.
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