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  1. #1
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    Default question about forklift steering hydraulics

    Hi
    at my workplace we have a Caterpillar F30 (about 20 years old) electric forklift. it stood without use for more then a year and I would like to reuse it. I've found that it has a problem. it's steering has a seperate hydraulic system and the pumpmotor operates constantly. as far as I know, it should work only when the steering is turned. the steering wheel is connected to a round cylindrical thing and to the side of it 4 pressure hoses are connected. I've seen no sign of any elctrical wires conncted to it, so, how does the pump motor "knows" when it sould start operating?
    Thanx for your help.

  2. #2
    Veteran Member Mechanos's Avatar
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    Default Re: question about forklift steering hydraulics

    It's called and orbital valve. There are load reactive and non-load reactive orbital valves. The pump should run all the time. Try searching for info on orbital valves.

  3. #3
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    Default Re: question about forklift steering hydraulics

    Thanx for the swift reply. wuold you know where I can find the circuit diagram of the foklift? I've sent a mail to Caterpillar, but they didn't even bother to answer.

  4. #4
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    Default Re: question about forklift steering hydraulics

    Quote Originally Posted by avz View Post
    Thanx for the swift reply. wuold you know where I can find the circuit diagram of the foklift? I've sent a mail to Caterpillar, but they didn't even bother to answer.
    read this one to start

  5. #5
    Advertiser kennyd's Avatar
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    Default Re: question about forklift steering hydraulics

    Quote Originally Posted by Mechanos View Post
    It's called and orbital valve. There are load reactive and non-load reactive orbital valves. The pump should run all the time. Try searching for info on orbital valves.
    I agree, the pump needs to run all the time. If it didn't then there would be a delay in steering responce while the pump starts and the flow get's going.
    KennyD
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  6. #6
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    Default Re: question about forklift steering hydraulics

    Thank you for your replies and a special one to Akkamaan. I'll try to fix it next week.

  7. #7
    Super Star Member J_J's Avatar
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    Default Re: question about forklift steering hydraulics

    Steering Valve

    https://www.surpluscenter.com/item.a...name=hydraulic

    We have similar steering unit on our PT's. This steering unit uses the fluid to push or pull a set of hyd cylinders to steer the unit. A small hyd gear pump feeds the steering unit, and when not steering, the fluid just passes through, and back to tank. It runs constantly. Our steering unit also has a priority valve in it to take all the fluid if needed. The FEL on out PT's use the pass through fluid to operate the FEL.

    none load reactive means that the cyl stay where you left them.
    Load reactive, means that the steering wheel returns to center.

    Check the pressure at the pump, while trying to steer.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  8. #8
    Super Star Member J_J's Avatar
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    Default Re: question about forklift steering hydraulics

    This will give you an idea what a steering valve looks like on the inside.

    http://hydraulics.eaton.com/products...CU-TS006-E.pdf
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  9. #9
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    Massey Ferguson model 85, Allis-Chalmers WD-45

    Default Re: question about forklift steering hydraulics

    Your Cat forklift is not made by Caterpillar. It is made by MCFA, Mitsubishi-Caterpillar Forklift Assoc. It's a Mitsu with Cat badges. Cat won't/can't give you any info.
    What exactly is the problem? Contact a Cat forklift dealer for info on your truck. Have the model and serial # handy. I may have a book for it, I'll have to look.
    Knowing is not enough, you must apply.
    Willing is not enough, you must do.
    Bruce Lee

  10. #10
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    Default Re: question about forklift steering hydraulics

    Thanx again people. you are very helpful. Wayne, as I wrote, I've sent a mail to Cat after I've tried with the local Cat agent, who told me that they dont have any technical stuff for such an old forklift. one of the problems is that the main pump motor contactor's point are burnet out and I would like to have the technical litrature that might help to take care of it generally.
    JJ - your answer helped me a lot to begin to understand how it works. my knowledge in hydraulics is quite basic so far, mainly cylinders.

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