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  1. #1

    Join Date
    Mar 2005
    Posts
    2
    Location
    Louisiana
    Tractor
    Yanmar 1500D

    Default 1500D Hydraulic pump & Control Valve Body

    I'm having problems with my 3 point lift. It is very slow lifting my 4 foot spreader box. I've changed the fluid and cleaned the screen but this didn't help. I'm thinking on changing the complete control valve body and maybe the hydraulic pump. Any information or tips would be appreciated. Also where I may be able to find these parts.

    Thanks

  2. #2

    Join Date
    Nov 2004
    Posts
    11
    Location
    Eastern Arkansas
    Tractor
    Yanmar 1401D

    Default Re: 1500D Hydraulic pump & Control Valve Body

    I suppose you have tried the pit cocks under ther seat. I have a 1401d that has 2 T handle pit cock valves. one adjust the drop rate of your 3ph with different weight attachments, the other can adjust the raise rate by partial closing it off. Try opening this one & see if that helps.

  3. #3

    Join Date
    Mar 2005
    Posts
    2
    Location
    Louisiana
    Tractor
    Yanmar 1500D

    Default Re: 1500D Hydraulic pump & Control Valve Body

    I have tried the pick cock valve and that didn't help. It will lift slowly after first start up but after it gets warmed it stops lifting completely.

  4. #4
    Silver Member
    Join Date
    Oct 2004
    Posts
    142
    Location
    Burks Falls, Ontario
    Tractor
    yanmar 195D (for sale)

    Default Re: 1500D Hydraulic pump & Control Valve Body

    I've had a problem with the half moon key in the pump drive shearing off. It's possible that this could create the senario you mention. when cold it could still have enough friction to pump but loose it as things warm up. Might be worth a look.
    Richard.

  5. #5
    Veteran Member
    Join Date
    Apr 2000
    Posts
    1,586
    Location
    Dixon, Il

    Default Re: 1500D Hydraulic pump & Control Valve Body

    Raise the 3 point & close the front valve. If it goes down, then oil is probably leaking past the lift cylinder seals. A sheared key usually doesn't work at all. A pressure gauge can be plumbed into the right plug on the lift cylinder housing. Full throttle psi should be over 2000 psi. Low psi means bad pump.

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