JD 1630 Hi Lo Issues I think? It's really weird!
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Thread: JD 1630 Hi Lo Issues I think? It's really weird!

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    JD 1630 Hi Lo Issues I think? It's really weird!

    Okay, right to the point. But first, why isn't a listing for the 30 series compact utility tractors? Ie: 1030,1630, 1830, 2130?

    Problem: transmission difficult to shift into gears. I must time my engaging of the range with the engaging of ANY gear (1.2.3.4)

    Symptoms and oddities.: When the Hi/lo is in Low, I can smoothly shift into any gear like its a new tractor. BUT, I loose hydraulic supply to all functions like steering and 3PH. I switch back into Hi and all hydraulic functions return to normal but it is again incredibly hard to place any of the gear levers back into neutral. Once in Neutral, very hard to put back in gear.

    Hi Lo is working, I can feel the shift down and up.

    Oh crap, here's a really bad symptom. Put the ol'e girl on the dyno and in Hi range I get 30 HP, Put her in Lo, HP immediately goes to 43HP.

    I have split her and can confirm that All steel lines and free of cracks. Also all sealing rings are in-tacked, none broken or worn down. All castings where rings ride are smooth without any grooving from the sealing rings. Clutch discs, pistons and rings are excellent.

    And lastly, when I drive in hi range just a few feet and I step on the clutch pedal, the tractor comes to a dead stop.

    Almost feels like Hi and Lo are both pressurized when Im in Hi range. Perhaps that explains the HP loss?

    Looking forward to hearing suggestions. I've been doing this line of work for quite a while but this one has me stumped.

    Also main clutch/pressure plate have been replaced.

    Thanks Dodgerrr.
    Last edited by Kennyd; 11-25-2019 at 11:03 AM. Reason: edited curse word

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    Captain Hook Kennyd's Avatar
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    Moved to proper forum (this is not a SCUT) and edited curse word.

    Welcome to GTT.
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    Quote Originally Posted by Dodgerrr View Post
    Okay, right to the point. But first, why isn't a listing for the 30 series compact utility tractors? Ie: 1030,1630, 1830, 2130?Thanks Dodgerrr.
    Welcome to GTT.
    Actually a JD 1630 was classified by JD engineers as a utility not compact utility tractor. A JD 1630 tractor should have 50 HP on the pto. My guess is tractor coming to an abrupt stop when clutch pedal is depressed is caused from dragging brakes. IMHO hyd hi-lo needs to have hyd pressures checked in both ranges.
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    Zebrafive's Avatar
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    First, for Hi/Lo you mean "rabbit/turtle" and have the left hand dash lever? Not to be confused with range I 1 -4 gears, or range II, 5 -8 gears?
    I am puzzled why it's hard to shift in one range.

    Lack of hydraulic functions indicate an internal leak, or filter relief valve has failed bleeding off pressure. Or bad transmission pump.

    I had the pressure plate drive for the Hi Lo assembly fail and then trans pump would not pump.

    I do not think both Hi and lo can be engaged at the same time, plus you say it shifts and you can feel the shift.
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    Zebrafive's Avatar
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    Did you check suction screen and replace the trans filter?
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    Tx Jim.

    The weird thing is when in Lo (turtle) on the on the panel mounted shift lever, I can depress the clutch pedal and it will coast to a stop. When I'm in Hi (rabbit and depress the clutch pedal, that's when it rapidly stops.

    Zebrafive.

    Both the suction screen and transmission oil and filter have been replaced. I also removed and checked the filter bypass valve.

    No pressure checks have been done. When dyno'd it made 40+hp. the pto brake works perfectly. Figured if both the pto clutch and brake work and I can hear and feel the HI/LO engage/disengage my pressures should be sufficient.

    One other odd thing. Engine running at 1800 rpm in Lo range. then switch to Hi range...engine drops to 1400rpm. You can definitely hear the load on the engine.

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    I suppose it's possible for hyd hi-lo shift valve spool to leak pressure between high & low speeds. This another good reason to check hyd hi-lo operating pressures.

    Since tractor doesn't abruptly slow down when in low speed then that would eliminate dragging brakes as possible cause that I suggested.

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    I would do the pressure checks TxJim suggested.
    I would use TWO gauges to see if one dropped to zero when shifting between Hi & LO.
    The small metal lines from the transmission pump to the Hi/Lo valve have o rings at each end, maybe one or more bad?
    Also two larger lines from the valve.
    Did you replace them when you had it apart?
    Did you check all the oil lines high lighted? Replace all the o rings?

    Maybe the a problem with the H/L valve? Key 11, 12, 7 13
    Attached Thumbnails Attached Thumbnails 1630oillines.PNG   1630hlvalve.PNG  
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    Zebrafive
    I can't envision how failed o-rings on hyd hi-lo supply tubes could be causing the dragging in high range problem. Would you please explain your theory?

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    Quote Originally Posted by Tx Jim View Post
    I suppose it's possible for hyd hi-lo shift valve spool to leak pressure between high & low speeds. This another good reason to check hyd hi-lo operating pressures.

    Since tractor doesn't abruptly slow down when in low speed then that would eliminate dragging brakes as possible cause that I suggested.
    I don't think I can independently check both Hi and Lo pressures to the clutch disc's. I believe my shift cover has 3 ports. One for system pressure, One for PTO clutch and the other for PTO brake.
    System pressure spec is 125-135 psi at 2100 rpm . I am getting that and a little more...closer to 145 at that rpm. However at idle I get 125 in Hi range and about 80 psi when shifted to lo range.

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