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Farmall & IHC Tractors Discussion Forum
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Super A hydraulic pump woes

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Karl Hamson

05-29-2007 20:19:48




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Thank Hugh and Super A tx but I still cannit get the pump to pump. I pulled the filter and it was spotless. I removed the pump and pipe assembly as one piece after some barked knuckles and wondering why IH had to put the oil filter in just that spot. Filled the suction line full and turned the pump by hand until oil came out the discharge port. The pump turns clockwise when viewed from the gear end, right? Anyway put it all back together and no joy. I must have got something wrong when reassembling the pump. Any ideas before I rip it all apart again? I searched the archives and EL Toro has a post with a good exploded diagram. My blue ribbon service manual for touch control shows almost nothing

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SuperA-Tx

05-30-2007 06:43:10




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:19:48  
I went back and read your other post and noticed something. You said your rear rockshaft arms would lift up and down easy by hand and you also said before you worked on the pump the arms would jerk. I am thinking now that the problem might be in the reservoir unit. Maybe the rings or something on the pistons went bad and letting the oil pass by. I dont know much about that unit but I had mine rebuilt and after that had to lift the rockshaft arms and had to prize it up. No way you should be able to lift it by hand without much resistance.

Theres a kit the guy got for mine and replaced all the rings and seals. I had to remove the whole unit and take it to him. Heavy little thing and the oil makes it hard to get a grip on.

Any of you guys think that might be the problem rather than the pump?

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El Toro

05-30-2007 05:25:35




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:19:48  
third party image

Are you sure that pump is being driven? Hal



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Hugh MacKay

05-30-2007 03:45:31




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:19:48  
Karl: If you have access to presure testing equipment, test the pump presure at the manifold. even just removing the plug on the small line and bumping the starter will tell you much. About 10 seconds cranking shold give you an oil bath, if you stand in front of it.

My next inclination is you must have accidently got some dirt in the lines last fall, and when you first started the tractor it pumped that dirt into the touch control unit. There are some quite fine ports, valves, etc. within that unit. It wouldn't matter which line as the screen is on the suction side, thus dirt introduced in lines would go unobstracted directly to the control valve part of unit.

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SuperA-Tx

05-29-2007 21:35:34




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:19:48  
Did you take the lines off when you worked on the pump? Did you put the two "O" rings back in at the pump where the lines connect?



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Bob

05-29-2007 20:53:08




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:19:48  
When assembling a pump, slathering a little "automatic transmission assembly lube", or even Vaseline on the gears will help it to prime, then dissipate into the oil, once it warms up.



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mark

05-29-2007 20:41:33




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:19:48  
this may sound stupid....but are you sure the pump is turning when the engine is running? If the thing sucks and blows oil when turned by hand...sounds to me like it's fine. Loosen the return line at the reservoir while it's running and see if it blows oil out. If so, the pump is working and the problem is in the reservoir/control valves.



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Karl Hamson

05-29-2007 20:50:24




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 Re: Super A hydraulic pump woes in reply to mark, 05-29-2007 20:41:33  
Everything worked fine before I replaced the seal. How can I take off the discharge line when it is all in a block combined with the suction line? Do I take out one of the pipe plugs in the manifold? Thanks for all the replies. Someone will eventually hit the nail on the head.
Karl



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mark

05-29-2007 21:11:35




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:50:24  
Well, unless my memory fails me, there are two hard lines connected to the reservoir to and from the pump. One is the suction side, the other the pressure/delivery side. I'd loosen the bolts that fasten the return line to the reservoir when the engine is running...it should squirt oil out....seems there is an O ring in there..might blow it out too if you loosen the bolts too much.

I had my reservoir off last spring and rebuilt the valve assembly...put in an entire kit. I hooked it back up, the pump self primed and the air will self purge by working the tough control levers and cycling the system. It's really a very basic and simple set up. I never had my pump off.....but, if it is a gear pump like those I have messed with in the past....it isn't anything but two meshing gears....unless there are too much tolerance between the teeth....I don't see how it can't work, PROVIDING it is turning. I'd check to see if it making pressure by cracking a line. If not, check that woodruff key as mentioned.

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SuperA-Tx

05-29-2007 21:28:22




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 Re: Super A hydraulic pump woes in reply to mark, 05-29-2007 21:11:35  
The two lines are built as one unit so you cant take one off without taking both off.

The "O" rings are at the pump, theres a little groove where they fit. Takes two of them.

At the hyd reservoir it has a gasket there.



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riverbend

05-29-2007 20:36:05




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:19:48  
If the key is good, did the relief valve go back together right when you had it apart ?

Greg



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gene bender

05-29-2007 20:43:30




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 Re: Super A hydraulic pump woes in reply to riverbend, 05-29-2007 20:36:05  
I hae had several of those pumps apart and rebuilt them but havent seen a relief valve yet what am i missing?



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riverbend

05-30-2007 05:35:17




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 Re: Super A hydraulic pump woes in reply to gene bender, 05-29-2007 20:43:30  
The pump on my SC had a spring loaded ball which I assumed was a pressure relief to keep the pump happy when the rockshafts weren't moving. The check ball was always trying to fall out of place when I put it back together.



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Karl Hamson

05-29-2007 20:26:33




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:19:48  
No noise at all. Before when the fluid got low it would kind of bark and the rockshaft would jump a bit but now nothing. Pump turns fine by hand and will push oil out the discharge.
Karl



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georgeky

05-29-2007 20:23:10




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 Re: Super A hydraulic pump woes in reply to Karl Hamson, 05-29-2007 20:19:48  
Karl, does it make any noise at all? Read my reply to other post. If it worked before it should be OK.



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