My turn with a hydraulic pump issue

Don Hooks · Oct 2, 2014

About 24 hours after getting my broken spindle replaced my lift stopped working. The first pic is the safety valve - is it supposed to look like this? I've ordered a new one anyway but I can't be sure it was the culprit. The second pic is a possibility. I can't swear I didn't damage the gasket taking the pump out but it looks suspiciously like it popped on its own. What do you think?

Jason S. · Oct 2, 2014

I can't say I've ever had a relief valve come apart like that. Where that gasket is torn or blowed out is the pressure port on the pump. The hydraulic fluid come out that hole and travels up the pipe to the lift cover and over to the lift cylinder. Best bet is to get a gasket kit and reseal the hydraulic pump while it's out.

s19438 · Oct 3, 2014

for those of us more ignorant folks what model tractor are you working on ?

Dan S (NY) · Oct 3, 2014

Don Hooks · Oct 3, 2014

(quoted from post at 11:58:01 10/03/14) for those of us more ignorant folks what model tractor are you working on ?

Dan is correct - it is a 1953 TO30 that I got about eight years ago. I put new valves and a bushing in the pump then and hoped I was set for the duration. Life happens...

Jason S. · Oct 3, 2014

I didnt know you had already went thru the pump. Ignore my comments about resealing the pump. Have you put new gaskets on the lift cover? If not there is a good chance that the gasket for it is brittle too. I'm not a fan of the gaskets that Tisco sells for the Fergusons and Fords. They look like they are made of construction paper. If it was me I would either get some from an Agco dealer or get some for a 9N from a New Holland dealer. The last time I was into the hydraulics on my TO-20 I got some genuine New Holland 9N gaskets. They were of much better quality and a lot thicker than the Tisco gaskets.

Don Hooks · Oct 3, 2014

Jason,
Thanks for the heads up regarding gaskets. I ordered one off eBay so it probably will fit the "construction paper" description. I'll stop by the New Holland shop and compare their product with the eBay gasket and go with the better one.

Don

Bob Bondi · Oct 4, 2014

I replaced the Hydraulic pump on the MF 165 tractor. After testing the valves for pressure I determined all worked fine. The three point Hitch also is working properly. After replacing the tractor seat, I went to move the tractor and found that it would not go forward or reverse in any gear, high or low, although I could hear the transmission move into gear, there was no power to the wheels to move the tractor. Could this be due to the secondary pump having now failed or some other reassembly mistake?

Don Hooks · Oct 5, 2014

(quoted from post at 19:31:58 10/04/14) I replaced the Hydraulic pump on the MF 165 tractor. After testing the valves for pressure I determined all worked fine. The three point Hitch also is working properly. After replacing the tractor seat, I went to move the tractor and found that it would not go forward or reverse in any gear, high or low, although I could hear the transmission move into gear, there was no power to the wheels to move the tractor. Could this be due to the secondary pump having now failed or some other reassembly mistake?

Bob, I don't know anything about tractors newer than a TO35 but it sounds like you have somehow put the drive clutch linkage in a bind and only your PTO clutch is still working.

Bob Bondi · Oct 6, 2014

Don: Thank you for your advice. We opened up the iron and found we had installed a part incorrectly. The tractor is now working as it should be. Bob Bondi

Dan S (NY) · Oct 7, 2014

Did you forget to install the drive shaft coupling above the pump?

Dan

Don Hooks · Oct 9, 2014

(quoted from post at 02:56:49 10/03/14) About 24 hours after getting my broken spindle replaced my lift stopped working. The first pic is the safety valve - is it supposed to look like this? I've ordered a new one anyway but I can't be sure it was the culprit. The second pic is a possibility. I can't swear I didn't damage the gasket taking the pump out but it looks suspiciously like it popped on its own. What do you think?

Conclusions: Took pump apart and found wear but not enough to be concerned. Replaced safety valve - the old one appeared to be stuck closed. Put it back together with the cheap "construction paper" gaskets (the New Holland store had moved to "who-knows-where"). It rattles a little under load but everything works. My take is that the jerking PTO shaft I reported on a couple of weeks ago was because the pump was maxxed out because the safety valve wouldn't open. The gasket blow out was the path of least resistance. I think the gasket was a far better outlet for the overpressure than the riser or pistons or ???. Anyone have another conclusion?

By the way - putting the control valve back in the fork through the side holes was just killing my old hands. Found a better way: Through the drain hole! Using a screw driver to flex the fork through the drain while holding the other side of the fork through the side hole took only a minute and a half.

Don Hooks · Oct 10, 2014

(quoted from post at 02:44:06 10/10/14)

(quoted from post at 02:56:49 10/03/14) About 24 hours after getting my broken spindle replaced my lift stopped working. The first pic is the safety valve - is it supposed to look like this? I've ordered a new one anyway but I can't be sure it was the culprit. The second pic is a possibility. I can't swear I didn't damage the gasket taking the pump out but it looks suspiciously like it popped on its own. What do you think?

Conclusions: Took pump apart and found wear but not enough to be concerned. Replaced safety valve - the old one appeared to be stuck closed. Put it back together with the cheap "construction paper" gaskets (the New Holland store had moved to "who-knows-where"). It rattles a little under load but everything works. My take is that the jerking PTO shaft I reported on a couple of weeks ago was because the pump was maxxed out because the safety valve wouldn't open. The gasket blow out was the path of least resistance. I think the gasket was a far better outlet for the overpressure than the riser or pistons or ???. Anyone have another conclusion?

By the way - putting the control valve back in the fork through the side holes was just killing my old hands. Found a better way: Through the drain hole! Using a screw driver to flex the fork through the drain while the other side of the fork was tied off with wire through the side hole - took only a minute and a half.

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My turn with a hydraulic pump issue

Don Hooks

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Jason S.

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s19438

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Dan S (NY)

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Don Hooks

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Jason S.

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Don Hooks

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Bob Bondi

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Don Hooks

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Bob Bondi

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Dan S (NY)

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Don Hooks

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Don Hooks

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