Steering pilot valve

Dieseltech

Well-known Member
Location
Akron, Indiana
Working on a 706 that seems to pull to the right, going to check out the pilot valve. If it needs replaced would a good used one from a 1066 fit and work OK? Are parts available for the early 706 valve?
 
No , a 1066 does not use one like on a 706. Now not saying thaat the valve is not bad , but i am leaning more to the steering motor as they do have some slippage . And some of this is normal . To test the amount of slippage you need to do a slip test with a beam style torque wrench and see how many turns you get in a give amount of time . Now off the top of my head and with out putting on my boots and going out to the truck and getting the book out i can not remember each and every step , this is why i have books .
 
Also you did not say wide ft. or narrow ft. Just like anything else on a wide ft. is the toe in set correctly ?? is the air pressure in both tires the same ?? do you have a wheel bearing problem ?? Is there leakage in the steering piston one way and not the other. Not every 706 steers the same , i have had some that hold well and others while going down the road you are always slowly turning the wheel one way or the other due to creep in the steering motor .
 
Tractor has a wide front, friend has owned since new. Last tractor drive we were on he noticed it drifting more than in the past. Will see what the valve looks like, someone told him the spring may be broken. Tractor is totally restored, now going to break some purdy paint.. Thanks for your help!
 
Drifting to one direction or the other was a big problem early on with the 7 & 806 tractors. Usually due to plowing with a slight side draft. Some guys would count the revolutions it would change in a round of plowing. IH had a spec in the book for acceptable leakage with a particular amount of torque on steering wheel in so many seconds. Then they got smart, made a new lighter spring for the steering valve and , whalllla , problem fixed and to top it off the tractor steered much easier. I installed a lot of them. When you look at the new spring you will say, this is not the correct spring as it is much longer but very light. Unless valve is scored, spring broke or end retaining spring partially unscrewed, those valves are trouble free. Of course, if wide front is out of wack that makes it much worse but the light spring still helps because it takes so little effort to correct. Easier on the steering arm also.
 
not that this is your problem but we had simular problem with the steering slowly creeping to the right just fast enough to be annoying especially while driving it on the road on a mf tractor, an old ih mechanic told me they had the same problem with some of the first ones used on the ih tractors and showed me how they lapped the parts to correct internal leakage,he had me to remove the rotor assembly from the hand pump then using a piece of 2000 grit emery cloth positioned on a thick flat piece of glass wet down with diesel placing both inner and outer pieces at the same time using light finger pressure and moving in a figure 8 pattern until both pieces had a dull appearance over the entire surface then do the opposite side and the end plates also,when I got it assembled back together the bolts were supposed to be torqued to 19 inch pounds,i could only tighten them to 7 inch pounds before it would lock so I left them at 7 and it worked with almost no creeping.
 

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