Won't turn left (2nd question for today)

majorlucas · Jun 22, 2014

I am now up to three tractors (670, and 2-602's) that are hard to turn left. My guess is the same issue in all three tractors. Two of the tractors' power steering valves leak out the cover plate vent.

(tried to bleed them, no effect)

Is it just a matter of taking them apart and replacing some seals? What do you recommend?

Thanks, Marty

pete 23 · Jun 22, 2014

Looks like those tractors use the same steering valve as a IH Farmall 560 or 460. The splined steering shaft on them has to move in and out depending on direction of turn. This then actuates the valve. So, if anything prevents this from happening no power steer or only partial if not moving full width. If that is ok, problem is in the valve. Usually loose nut, or bent washers on spring end. But, I bench test with air to see if I get equal flow for both directions when manually moving spool. Have added a washer in just the right spot to equalize the flow. Unless, of course , you have leak internal cylinder.

jr1983 · Jun 22, 2014

Does anyone know if that uses the same pump set up as a 900 gas? If so there's a plunger in the pump that sticks. Not sure what it does just know you can push it to center from the outside and the tractor will steer correctly till it sticks again.

majorlucas · Jun 22, 2014

The 670 (not the 670 Super) uses oil from the hydraulic system (so no separate pump) Thanks

majorlucas · Jun 22, 2014

Sounds like I need an o-ring kit and some washers. Thanks, Marty

Alan K · Jun 22, 2014

Im not sure but might be that the valve is not centering properly, allowing it to have assist in one direction and not the other. You could possibly loosen the 4 Allen cap screws slightly and try moving the valve in a couple different positions to see if it makes a difference. They can be very tricky to get to work properly. MMDEL hopefully will chime in, he knows a lot about those steering systems.

pete 23 · Jun 22, 2014

I should have added to my post that some of those style valves did have slotted mounting holes so you could adjust . The ones used by IH did not. The ones I did see were actually on five ton army trucks. We used to adjust them but that was normally because the truck wanted to pull one way or the other. John Deere used an adjustable valve but that is a whole different set up, and they are really touchy to get just right.

Anonymous-0 · Jun 24, 2014

Having run a 602 13.000 hrs our solution to the steering problem was to replace the actuator lever and fulcrum bushing every two years and to reverse the bushing on the alternate years. This removes lost action from the valve train. The valve movement is very slight so any lost action really fouls things up.

majorlucas · Jun 24, 2014

I will pull out the book and see what the bushing is. I'll call Welter's to see if they have them.. Thanks! Marty

Won't turn left (2nd question for today)

majorlucas

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pete 23

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jr1983

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majorlucas

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majorlucas

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Alan K

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pete 23

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Anonymous-0

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majorlucas

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