2040 hydraulic pump squealing
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Thread: 2040 hydraulic pump squealing

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    2040 hydraulic pump squealing

    My front hydraulic pump is squealing. Any ideas on how to approach fixing it?

    JD2040 serial number 319xxx.


    In the last three weeks I have already
    Redone the wiring. Put in a new ignition switch, fixed several of the gauges and indicator lights. Fix loose steering by replacing the steering arm. Changed the oil and hydraulic fluid with filters. Cleaned the hydraulic screen. Power washed and de-greased the tractor. Replace the seal and ball bearings in the PTO.

    Still to do
    Fix the alternator, brakes, bushing on front end, put on fire extinguisher, check water pump, and get rid of noise coming from from hydraulic pump!!

    Jimmy

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    flyweight's Avatar
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    Hard to say what's making the noise.
    Have you checked the main pump standby pressure? This should be done before proceeding.

    Install a 3000 psi gauge into one of the SCV outlets. Run tractor and engage the SCV lever. Standby pressure should be 2250 psi.

    Click image for larger version. 

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    Pressure adjustment is made by turning adjusting screw (#27) IN, or OUT.

    Click image for larger version. 

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    There are many situations than can cause the Hydraulic Pump to squeal.

    One of the possible cause of improper pressure could be the condition of valve and seat(#9).
    Last edited by flyweight; 04-21-2018 at 11:14 PM.
    Michael

    2019 JD Z540R, 54" cutting deck w/MulchControl™
    1984 JD 750 Tractor
    1971 JD 15 Chainsaw, ← hasn't run since ~1975

    Also have a bunch of other useless stuff.










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    Also check for wear in hyd pump drive coupler. It's also possible hyd filter relief valve is stuck open therefore starving frt pump for oil.

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    Thanks

    Thanks for the help.

    Today I checked the filter on the front hydraulic pump.

    This week I hope to check out your suggestions above.

    One question, in my manual it always says to "relieve hydraulic pressure", but it never says how.
    This is likely a dumb , rookie question, but i just want to be safe since I will be working on the high pressure side.

    If/when I unscrew the STOKE CONTROL VALVE ADJUSTING SCREW, will this release the pressure before I remove the STROKE CONTROL VALVE GUIDE for inspection.

    Is the hydraulic system only under pressure(Closed Center System) when the tractor is running?

    Thanks again

    Jimmy
    eyeboltman and em14 like this.

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    AlKozak's Avatar
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    Quote Originally Posted by Jpd83 View Post
    Is the hydraulic system only under pressure(Closed Center System) when the tractor is running?
    Not exactly. In an open center system the operating pressure of 2500 psi or more is only realized when the tractor is running and a spool is open. If the SCV is left in the neutral position, fluid simply bypasses the SCV and returns to the reservoir at a fairly low pressure. Closed center systems use a variable flow pump to change pressure on demand - there is no constant flow back to the reservoir when all the spools are in neutral. These should be assumed to maintain pressure when the tractor is not running.

    Implements left in a raised position also create pressure dependent on the load left on the implement.

    Always assume a hydraulic system is pressurized. An implement can be depressurized by stopping the tractor and operating all the SCVs in both directions and making sure gravity has lowered anything raised. A 3pt hitch is depressurized by stopping the tractor, setting the rockshaft control to full lift and then letting it drop by setting the lever to full lower.

    Al
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    Ok, thanks for explaining that to me!!

    Jimmy

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