Deere 6420 with really stiff steering
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    Deere 6420 with really stiff steering

    I just bought a 2005 John Deere 6420 and it has really stiff steering, and really slow hitch movement. My first attempt to resolve this issue was to drain the hydraulic/trans fluid, check and clean the sump screen, and replace they hydraulic and transmission filters. I then refilled with new JD HyGard fluid, but this had no effect on the problem. Raising to max RPM has very little effect - maybe just a very slight improvement. What would you do next?

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    johnH123's Avatar
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    I would treat for algae.
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    Does there seem to be a lot of hydraulic noise? COuld be hydraulic pump or a cracked rockshaft valve housing. Have seen a few of these crack.
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    Quote Originally Posted by jd110 View Post
    Does there seem to be a lot of hydraulic noise? COuld be hydraulic pump or a cracked rockshaft valve housing. Have seen a few of these crack.
    No, not much if any hydraulic noise. It acts like the pump stays in low pressure standby mode 100% of the time and never increases flow/pressure when trying to steer or raise the hitch.
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    Captain Hook Kennyd's Avatar
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    Quote Originally Posted by johnH123 View Post
    I would treat for algae.
    Why? What did he write that gave the indication of algae growth in the system?
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    Quote Originally Posted by paoutdoorsman View Post
    No, not much if any hydraulic noise. It acts like the pump stays in low pressure standby mode 100% of the time and never increases flow/pressure when trying to steer or raise the hitch.
    Don't know lots about this but perhaps the pressure relief valve would be a good place to start? If you have a guage, measure pressure against spec. Kennyd sell them if you don't already have one.

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    I think measuring pressures at the test ports and SCV's is my next step. I asked a neighbor who has the appropriate test gauges to stop over when he has some time.
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    Quote Originally Posted by Kennyd View Post
    Why? What did he write that gave the indication of algae growth in the system?
    Quote Originally Posted by paoutdoorsman View Post
    I just bought a 2005 John Deere 6420 and it has really stiff steering, and really slow hitch movement. My first attempt to resolve this issue was to drain the hydraulic/trans fluid, check and clean the sump screen, and replace they hydraulic and transmission filters. I then refilled with new JD HyGard fluid, but this had no effect on the problem. Raising to max RPM has very little effect - maybe just a very slight improvement. What would you do next?
    Seems like a clogged passage or filter, new fluid and filters had little affect.

    algae seems to me to be the cheapest and easiest thing to fix right off the bat. I would go with the cheapest thing first.
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    -Countyline box blade,
    -Allis Chalmers sickle mower,
    -RED windrow rake,
    -titan 48" 3000 pound forks/bale spear
    - Farm Star rear bale spear

    Yamaha Rhino 700, Yamaha Rhino 660,
    Murray 624 mower/38" deck

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    Quote Originally Posted by paoutdoorsman View Post
    No, not much if any hydraulic noise. It acts like the pump stays in low pressure standby mode 100% of the time and never increases flow/pressure when trying to steer or raise the hitch.
    I am wondering if the filter bypass is stuck and not allowing pressure to build??

    Also there are test ports on the rear (near the rockshaft control valve) for Load sense, Steering, and System pressures.
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    Quote Originally Posted by jd110 View Post
    Does there seem to be a lot of hydraulic noise? COuld be hydraulic pump or a cracked rockshaft valve housing. Have seen a few of these crack.
    I second that, the rockshaft housing, seen that on earlier 20 series. New replacment valves are narrower and redesigned.When replacing don't miss track of the load sense discs when pulling apart the valves (small black discs half the size of a dime that fit into ressesed ports) Without seeing/testing it that's my guess, cracked valve internally leaking.
    Last edited by bcbrouwer; 02-07-2018 at 01:06 PM.

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