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JD 40 Losing Hydrualic Fluid to Engine Sump

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Prune Picker

01-22-2001 08:38:57

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I've noticed the oil level in the motor of myb 1955 40U going UP recently. This weekend the hydrualic lift wouldn't work. I refilled it with 10W-30 motor oil and the lift works fine now. Apparently the hydraulic pump is leaking oil into the engine sump. Do I need to completely rebuild the pump, or is there a simpler "fix" for this problem? It leaks whether the tractor is in use or not. THANKS.

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01-22-2001 13:56:12

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 Re: JD 40 Losing Hydrualic Fluid to Engine Sump in reply to Prune Picker, 01-22-2001 08:38:57  
Your symptoms of the relocation of hydraulic fluid to the engine crankcase is most likely the result of a seal failure on the hydraulic pump. The hydraulic pump is mounted to the front of the engine and is driven by the camshaft. Unfortunately there is only one solution and that is to replace the seals. Not a difficult job but a very important one. If the pump is allowed to run with no fluid it will destroy itself. The problem with it leaking while the tractor is idle is most likely the result of residual pressure in the hydraulic system after engine shutdown.

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01-22-2001 18:51:05

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 Re: Re: JD 40 Losing Hydrualic Fluid to Engine Sump in reply to pat, 01-22-2001 13:56:12  
I have the same problem with my 40. I have bought the parts but waiting for warmer weather to fix it. I believe it leaks when sitting, also because the reservoir may be higher up on the tractor than the pump. The parts i have are not especially expensive, about $30. Of course it may require more when opened up.

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