IH 666 with weak 3pt.

IH-Mitch · Jul 5, 2011

I bought an IH 666 that had been used for pulling a rake and other light duty work for the past 30+ years. The problem is they never used the 3pt, and the handles for draft control and 3pt control froze up. After soaking it down with oil and leaving it for a few days they finally came free. The 3pt went up slow but did go up and goes down fine. I hooked up the bale forks to it and it has no lifting power.

When hitting the hydraulic levers you can hear the pump working, but i never tested the hydraulic pressure yet. Power steering works fine also.

So I'm not sure if I messed something up when loosing the frozen levers, hydraulic pump/ filter, stuck valve somewhere, or what.

Any help or suggestions would be appreciated.

Thanks

erik dekeyser · Jul 5, 2011

Well first of all what i would do is change the hydrolic filter and if its been sitting for a while losen the drian plug at the bottom just above the draw bar and see if water or oil comes out. If its water let some out slowly until it turns to oil or just change it and put in new hytran oil.

pete 23 · Jul 5, 2011

That tractor has a seperate pump mounted piggy back on main pump, and relief valve for the hitch and if the hitch is not being used the flow from hitch pump joins the flow from main pump behind the aux valve mounting. There fore , when you pull aux valve and it makes tractor labor that only tells you the main pump is working and the unloading valve to hitch if most likely ok also. So, that brings you to a weak hitch pump, leaking hitch relief valve which is under the cover under seat or blown internal o-rings in draft control valves or cyl. Could possibly by action control valve sticking but I would have to feel your lever to tell you that. If your hitch will go up and down with no load and follow the positiion control lever all right ( MEANING IT WILL NOT JUST GOT ALL THE WAY TO TOP OR BOTTOM) I would think your linkages are ok.

karl f · Jul 5, 2011

if the hitch was down all those years, the lift
cylinder bore could have become rusted and
pitted due to condensation. A bad cylinder
bore will destroy the piston oring(s) and there
will be pressure loss.
At any rate lack of use is worse than use. I
believe 3 points should remain "up" when not
in use unless they interfere.

karl f

IH 666 with weak 3pt.

IH-Mitch

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erik dekeyser

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pete 23

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karl f

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