hydraulic pump

[hdltch]

Is there any way to tell if the Hydraulic pump is good or bad on a 1950 ford 8n. It had a twisted shaft in it and I had to cut it out. How hard is it to take that pump apart and clean it up and put it back together and reuse it. Thanks

 

[Bruce (VA)]

"Is there any way to tell if the Hydraulic pump is good or bad on a 1950 ford 8n"

Yes.

With a pressure gauge, under load. But that's not realistically possible with the pump off the tractor.

While it's off, I'd at least clean it & replace the safety valve.

Put it on your work bench & remove the safety valve (p/n 638) and the control arm lever (p/n 643) which will allow you to remove the intake & exhaust valves (p/n?s 640 & 698) Drop all of it in a bucket of diesel (or mineral spirits) or your parts washer & let it soak overnight. Once it has a good soaking, get it on the bench & start blowing it out w/ compressed air. Run cleaning fluid into the hydraulic discharge near the test port & make sure you get a good flow out the small hole in the side of the pump were the control valve fits. I don't see much need to pull it down any further just to clean it. But, I always replace the safety valve (p/n 638, about $25) Reinstalling the pump is harder than pulling it out because you have a gasket to worry about. (no sealer on the gasket) And, you will probably need a helper to guide the control rod into the pump rocker shaft unless you?ve done this 6 or 7 times before!

While you have the PTO shaft out, it would be a good time to replace the seal on it. It's got two spring clamps around it. Take your needle nose pliers & remove the one in the front. Then, hang the shaft & bearing housing in your vice & tap the butt end of the shaft; the bearing cap will come off (and the shaft will land on your foot). Then, remove the other spring clip from the other side of the bearing. At this point, remember that you never bought a seal driver & go get a BF socket & drive the seal out. If you have the new style seal, the white side goes out. (open side to the oil) Put some grease on it.

Contrary to conventional wisdom, not a lot of water gets in the oil from the shifter boot. Of course, if it's bad, replace it, but you get water from the draft control spring & the dipstick. But, most water is just a byproduct of the heating/cooling cycle of the oil.

You?ll need a pump gasket, safety valve, inspection plate gasket(s), PTO seal, PTO gasket, gasket sealer & 5 gallons of fluid to do all of the above.
75 Tips

 

[jimtrs]

(quoted from post at 22:53:47 03/17/17) Is there any way to tell if the Hydraulic pump is good or bad on a 1950 ford 8n.

Yes. Pressure test on a running tractor. Put a pressure gauge (2500 psi +) into the test port, lower the lift arms and chain them down to the axles and raise the quadrant lever. Check your pressure gauge. If all is good you should be around 1200 -- 1500 psi IIRC. You should check those specs in a service manual. The procedure is outlined in service manuals and should be followed.

How hard is it to take that pump apart and clean it up and put it back together and reuse it.

Not to difficult. The hardest part would probally be scraping the gaskets of the side covers. Make sure valveing is reassembled correctly. Just taking it apart and cleaning it up won't fix a damaged pump though.

If it was me, I would first check the pressures. If that test is good, you should be good to go. If your pressure test fails, diagnose why and then consider a rebuild, or replace if damaged.

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