International 4900 power steering

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mission_creek, May 29, 2021.

  1. May 29, 2021 #1
    mission_creek

    mission_creek Bobtail Member

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    Have a 94 international 4900 dump truck with tag axle. About 5 loads in the power steering seems to taper off until there’s nothing to turn corners with. Unloaded it is still very weak. The drivers side pump was replaced a few years ago. Any thoughts?
     
    mission_creek, May 29, 2021
    mission_creek, May 29, 2021
    #1
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  3. May 29, 2021 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    I thought there was only one pump? Do you have a hydraulic steering box on the right side you replaced?
     
    BoxCarKidd, May 29, 2021
    BoxCarKidd, May 29, 2021
    #2
    AModelCat Thanks this.
  4. May 29, 2021 #3
    Heavyd

    Heavyd Road Train Member

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    Once your fluid heats up, it becomes thinner and either your pump or steering gear is bypassing.
     
    Heavyd, May 29, 2021
    Heavyd, May 29, 2021
    #3
    AModelCat Thanks this.
  5. May 29, 2021 #4
    mission_creek

    mission_creek Bobtail Member

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    Steering gear box correct and there is two. Should have proof read. Rebuild kit or just just buy new pump?
     
    mission_creek, May 29, 2021
    mission_creek, May 29, 2021
    #4
  7. May 29, 2021 #5
    AModelCat

    AModelCat Road Train Member

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    Get it tested. A good shop will have a flowmeter and can isolate which one of the 3 components (steer boxes and pump) that is bypassing.
     
    AModelCat, May 29, 2021
    AModelCat, May 29, 2021
    #5
    BoxCarKidd and Heavyd Thank this.
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