Hydraulic leak at pump lines

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Hydraulic leak at pump lines

Postby Jaybar12728 » Sun Jul 02, 2017 7:06 pm

:help: Just bought a 73 Cub with a belly mower. Hydraulic fluid leaking (streaming out really)where the lines connect out of the pump. I've replaced the o-rings (twice) and still leaking. Is there a pressure releaf valve somewhere? Only thing I can think of is over pressure.

Bob McCarty
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Re: Hydraulic leak at pump lines

Postby Bob McCarty » Sun Jul 02, 2017 8:41 pm

It's fairly common for the lines to crack where they insert into the rectangular block. I'd clean and dry the area well and see if you can verify where the leak starts. A crack there can be brazed. There is a pressure relief valve in the block but I don't think it would cause your problem.
"We don't need to think more,
we need to think differently."
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Dale Finch
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Re: Hydraulic leak at pump lines

Postby Dale Finch » Sun Jul 02, 2017 8:44 pm

It's quite common to have them leak there. I think vibration plus the muscling it takes to line them up when taking off and putting back on, works them loose where the line connect to the small block that bolts to the pump. The easiest and cheapest fix I have done is brazing or siver soldering around each tubing at that forward end. I have repaired 2 or 3 this way. Good luck!

Bob, you're too quick!

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