1586 steering

[Cliff Nelson]

Looking for insight on repairing the steering motor on a 1586. It drifts to the left all the time. I have it apart but nothing obvious or worn. Anyone run into this before?

 

[Mrfred54]

They are hydrostatic steering motors. They are allowed to have a limited amount of slip. Never had much luck rebuilding them, only resealing there leaks. Make sure your cylinder does not have an internal leak. Pretty sure Worthington tractor parts carry those motors

 

[caterpillar guy]

My 806 will do that some when driving on the road.I just turn the wheel to compensate for it. I do have another hand pump to replace it just didn't want to get into that. I never had one apart that far just fixed the leaks on our 1466, 856 and 574. I do know some of them are timed and if not kept in time when assembled will do some strange things. Our 574 is that way according to the service manual.

 

[BarnyardEngineering]

There's a whole troubleshooting procedure for the steering system in the service manual and in the I&T manual as I recall. Steps to run through to determine what is causing the issue. It's not automatically the hand pump.

 

[pete 23]

Too late now, but I like to jack up the front end and run engine at moderate speed to see if steering stays straight ahead. This will tell you if you have a problem in steering hand pump . Could be valve is not centering properly or worn. You can also put gauges on each steering line that feed the steering cylinder to see if they maintain same pressure when engine is running and not trying to steer tractor.

The hand pumps on 66 and 86 series tractors have little vanes on the ends of the lobes in hand steering pump. Their purpose is to reduce drift, leakage . Older tractors did not have these. Also, some hand pumps have a stiffer torsion bar in hand pump than others have. This makes for slightly harder steering and contributes to any drift because it takes more effort to maintain straight ahead position.

This drift was a problem in 06 & 56 series but they had a separate steering pilot valve . This problem was overcome when they provided a much lighter spring on the spool in the steering pilot valve. I put in a lot of them and made for much easier steering and less drift.

The main cause of any drift is of course some small leakage that is normal and most any situation you have a little side draft. Can be crown on road or field, front end alignment, camber or caster or tires not being worn equal .

Acceptable leakage is checked with given amount of torque applied to steering wheel with engine running, tractor on smooth hard ground.

 

[Cliff Nelson]

I&T troubleshooting does not address this problem. Customer installed a steering motor off a different tractor and it works ok with that so the problem is in the motor.