2040 hydraulic problem
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    2040 hydraulic problem

    I just started a job at a turf farm and inherited a broken 2040. The data plate is either missing or covered up by the arms for the homemade ballast box, but I believe it's a 79 s/n 324720.

    The problem(s) it's having is that the 3-point hitch won't lower (it raised automatically when I first started the tractor last week), and the hydraulic steering isn't giving any assist. Prior to me starting here it had the hydraulic pump replaced, I believe for the same hydraulic problem(s) I'm dealing with.

    The pump is working, because a hose blew the other day and shot fluid 20 feet to the ceiling.

    The auxiliary hydraulics for the implement also load the engine when the control lever is deadheaded, but there's absolutely nothing going on when I raise or lower the draft control lever.

    I already took off the transmission top cover to check for anything binding, broken, or loose, but without a diagram I could have missed something. I noticed that the 3-point hitch arm shaft has a piston that appears to go into a tapered cylinder with what looks like a nozzle at the bottom, which I assume blows hydraulic oil out to push the piston out and raise the hitch arms. The arms do not lower by manual pressure.

    I also poked around in the rearend center section to see how the draft control works, and believe I have the clevis properly aligned on the little "hammerhead" lever.

    As far as the steering, I'm starting to think the hand pump may be worn out because it was used without power steering for quite some time. Right now I'm waiting for a tee so I can check pressure at the pressure line going to the steering motor, and maybe I'll try to find a service manual for this thing. Any help will be appreciated, hopefully I separated my thoughts and worded them in a way that can be understood. Thanks.

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    AlKozak's Avatar
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    Quote Originally Posted by NH2112 View Post
    The problem(s) it's having is that the 3-point hitch won't lower (it raised automatically when I first started the tractor last week)...
    That sounds like the rate of drop valve is closed.

    Al
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    flyweight's Avatar
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    Quote Originally Posted by Al
    That sounds like the rate of drop valve is closed.
    Rate of drop adjusting bolt.

    Attached Thumbnails Attached Thumbnails mvphoto2061.jpg  
    johnH123 likes this.
    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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    Thanks, I’ll take a look at that valve adjustment tomorrow. I’m assuming all the way in is closed?

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    Welcome to GTT
    Ditto on possibility of R-O-D screw being totally closed. I witnessed several had been closed getting on/off tractor when I was employed at a JD dealership. Since you don't know serial number can you post a photo of the hyd pump in frt of radiator. With aid of photo of hyd pump it can determined if tractor hyd's are open or closed center. When you reinstalled rockshaft housing did you get cam follower to the rear of rockshaft control linkage roller?

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    Quote Originally Posted by Tx Jim View Post
    Welcome to GTT
    Ditto on possibility of R-O-D screw being totally closed. I witnessed several had been closed getting on/off tractor when I was employed at a JD dealership. Since you don't know serial number can you post a photo of the hyd pump in frt of radiator. With aid of photo of hyd pump it can determined if tractor hyd's are open or closed center. When you reinstalled rockshaft housing did you get cam follower to the rear of rockshaft control linkage roller?
    If the cam follower is the 1/4" thick metal arm with T-shaped ears on it a little to the right of center, yes, I lowered the cover at an angle and used lineup pins to hold the rear in place while I ensured the linkage was underneath the ears on the follower. I'll post a pic of the pump in a few.

    (Yes, I know the hose in the 2nd pic is loose )

    Click image for larger version. 

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    Click image for larger version. 

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    Last edited by NH2112; 08-14-2018 at 08:11 AM.

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    This 2040 has open center hyd's. Power steering is supplied oil by smaller frt pump & 3 pt is supplied by larger rear pump.
    NH2112 likes this.

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    NH2112 (08-15-2018), Zebrafive (08-15-2018)

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    I know it has hydraulics from the shower I took the other day, so now (as soon as I stop being the rope in a 5-way tug of war) I'll figure out how to check pressures in the steering. With everything being done inside the case it's not like your generic hydraulic orbit motor steering. Time to find a service manual, I think.

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    Ditto on you needing a tech manual. I'll suggest you get a JD not I&T tech manual
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    Parts & tech manuals are on the way. I decided to pull the rockshaft housing off and take some pics in the hope that someone can point something out to me.

    Viewed from the left rear. This is the lever (cam follower?) that I had the rockshaft control roller & ears around.

    Click image for larger version. 

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    Viewed from the left front.

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    The control lever roller and ears.

    Click image for larger version. 

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    Rockshaft control linkage.

    Click image for larger version. 

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    The lever at 4 o’clock to the rockshaft, which seems to move the rockshaft lever ears up and down on the cam follower.

    Click image for larger version. 

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