Re: 2656-hydraulics question-draft control housing

Posted by bc on February 05, 2008 at 09:58:56 from (66.138.123.176):

In Reply to: 2656-hydraulics question-draft control housing posted by bc on February 02, 2008 at 21:22:39:

Here is another update for those following along and for the archives. Went over last night before the blizzard hits today.

I pulled the hex shaped plug about 3" long in the left front corner of the draft control housing. Looks like it was just a 3/8" plug. One of the manuals mentions removing it as a drain while you are working in the housing. I'll leave it out.

I put 2 new o-rings in the flange on the right front side inside the housing. Not sure if it leaked before and was a problem or not, but it won't leak now.

I pulled the poppet relief valve in the right front corner inside the housing. This relief valve has an open hole in the top that if it is open, it will blow fluid straight up and against the top plate(when there). I saw a piece or two of metal holding the check ball open in the bottom of it. I put it in the vise to try to unscrew the top ring that holds the inner spring in place. It wouldn't budge with a screwdriver or using a hammer and chisel to try to turn it. The spring is too strong to be able to push on the ball with a screwdriver by hand. Put it in the vise lengthways with a screw pushing on the ball and got it to depress slightly with the vise. After 3 times of this, the metal pieces disappeared and the check ball is now seating. I don't know where the metal pieces went cause they didn't fall out from the check ball orifice nor did they shake out from the hole in the top. They looked like flat pieces of metal and I suppose it could be broken pieces from the spring. After the blizzard ends tomorrow, I'll shovel off the predicted 10" of snow and reinstall the check valve and fire it up to see what happens. The only problem I see with this fix is that these are all connected to the main pump running the loader and hoe which actually have been working all along unless there is some type of connection that keeps the power steering pump bypassing also. I'll post back with the results. Also it this fixes it but I have later problems with it bypassing again, I'll know just to buy a new one (without broken metal in it).

I still have to get a guage and do some psi checks but I'm not really seeing too many places where I can tie into to psi check and them some stuff is 3/8" and some is 1/2" and I think the steering lines are smaller yet and all with differing fittings which cost a few bucks a piece.

I talked to a service mgr at a different caseIH dealer yesterday when I picked up the o-rings and he said about all the power steering problems he ran into were because of a weak pump. On mine, the large pump goes into the bottom of the flow divider valve and the small pump goes into the top. They have different sizes of lines but I suppose one way to check the small pump is to cap it off and then tee off the big pump and go into the top of the flow divider to see what happens.

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