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  1. T

    JD401B hydraulics problems

    Update: I've replaced seals/gaskets/rings in the 3pt lift cylinder and valve assemblies. I've increased standby pump pressure by 100 psi. I freed up a stuck flow control valve in the rockshaft housing (this was preventing the lift from operating). I've readjusted the L/D adjustment screw, lift...
  2. T

    JD401B hydraulics problems

    That's what I was thinking too, TxJim. It just acts like high pressure flow is restricted to that cylinder somehow and I was thinking maybe the precise position of the lever and linkage may have had more to do with it than I realized-- to the point that perhaps it was beyond correct adjustment.
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    JD401B hydraulics problems

    More expert knowledge from the pros. Thanks Jim.ME. I'm trying to rule out every possible point of failure. Since I have pressure and the 3pt does lift, seems to me there's only a few things it could be. One thing bugging me. The lift lever quadrant assembly has broken and been welded back. It...
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    JD401B hydraulics problems

    Guess mine is one of them, TX Jim. Good to know--Thanks.
  5. T

    JD401B hydraulics problems

    The flow control valve may still have a problem. I removed a valve (spool?), a spring and a small flat washer. Then, proceeded to clean out the bored area. There are two other passageways that intersect with the valve bore, I think. One has a steel ball at one end in the rockshaft housing. I...
  6. T

    JD401B hydraulics problems

    Well, I increased pressure to 2350 today. I think it helped a little, but something is still not quite right. The 3pt lift is just slower to rise than it should be. Scratching my head on this thing. Any other suggestions?
  7. T

    JD401B hydraulics problems

    Thanks Tx Jim. Will try that next.
  8. T

    JD401B hydraulics problems

    Unless I missed it, there's precious little information about it in the TM. It's a spool, a spring and a washer. It could still be part of my problem. Freeing it up definitely helped the 3pt but its still too slow. Any ideas?
  9. T

    JD401B hydraulics problems

    The valve is identified in my TM 1091 manual section 50 50-7 Figure 6 as Flow Control Valve. It's just in front of the L/D lever assembly in the rockshaft housing behind a plug. Freeing it up did get the lift working but it's still slower than it should be. I think my problem now may be the...
  10. T

    JD401B hydraulics problems

    May be on to something now. Just discovered the flow valve in the rockshaft cover is stuck. Crossing my fingers cleaning it fixes my problem.....
  11. T

    JD401B hydraulics problems

    Update: Replaced Orings in 3pt control valves and adjusted linkage. No improvement. I did notice, looking through the hyd fluid filler cap, oil spraying but think it may be lube for the trans gears? Next, I think I'll check adjustment of the L/D. Guess I'll be welding a socket and extension...
  12. T

    JD401B hydraulics problems

    I'd appreciate help with this older JD401B 3pt lift. I've read everything I could find on this forum but can't quite pinpoint the problem. The lift rises so slowly you can barely see it move. I haven't put guages on the transmission pump but the main pump seems good. I adjusted it up from 2100...

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