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Calling the smart guys....Please Verify?

A

Allan in NE

Well-known Member
Tell me if I'm on the right track.

5488 power steerin problem. Been running checks on everything under the sun for 3 weeks now and can't put my finger on the culprit.

In despiration, I throw everything back together, then the dog and I go for a long drive with 'er down in the pasture.

I notice that if I keep the revs up over say 1550 or so, steering is just fine; idle it down and I've immediately got the armstrong thing going on.

To my mind that eleminates the hand pump and the cylinder 'cause it really gets hard to turn and there is no slippage.

Regulated pressure is on the low side at 240 lbs and this gal did not have a bypass valve in the steering/lube filter (that wipes out pumps).

I think I bought it just when the gear pump is "beginning to fail"? To me, reving it up and getting the steering back just screams weak pump??

Whatcha think?

Allan

mj965d.jpg
 
I agree. From the seat of the pants approach, that would be the best guess. However a 50% hemorrhage could bypass volume such that high RPM was needed to build enough to power the steering. A flow rater on a check port would satisfy me. Jim
 
reminds me of the old 930 case with that junky little p. s. pump that you had to have engine reved up to get it to work. sound like pump.
 
I'll put a gauge on that brake feed coming out of the hand pump and see if it changes with the rpm. By "dead heading" it like this and with no steering wheel movement, I should see the max pressure shouldn't I? Upwards of 2000 lbs?

I took the supply line off at the flow divider and bumped the starter......oil shot half way across the shop, so think there is 'some' flow. :>)

Allan
 
no experience with 88 series but what you described sounds like massive leakage- either in the pump or somewhere else. just brainstorming here- is there a line you could run into a bucket w/ a stopwatch that would represent full pump output, or if you have the spec on how much flow should be to steering system, etc- just to make sure you don't have a blown o ring or slipped tube on the inside?
 
Not that smart but what are the other hydraulic functions like? Could it be some kind of priority valve problem? Generally pumps when starting to wear lose ability to produce relief pressure first and volume later. Good luck....Ron
 
That's what I'm thinking also. I'll have to run another check to see if it even gets to relief pressure.

I'll tell ya, when that big hog looses steering, ya know it in a hurry.....:>)

Allan
 
The circuit is "thru" the hand pump and then feeds the wet brakes. The brakes work, but seem a bit "lazy" to me.

Just got the tractor so am trying to iron out these little issues.........I say 'little'; that pump is $1690 and a used hand pump comes to $850. Sure don't wanna buy both to "guess". :>(

Been all thru the flow valve and relief valve....nothing wrong there.

Allan
 
Come to think of it, this pump also supplies the transmission control circuits.

It takes an absolute minimum of 235 lbs controll pressure before the trans won't shift.

I have 240 lbs and seems to drop a little the warmer the oil is. Also, to my mind the power shift is a touch lazy also......does not snap quickly like an old TA would.

But, like I say, I'm new to this tractor and don't know what "normal" should feel like.

Allan
 
Neither a smart guy nor an hydraulics expert at all, but I do know that for an hydraulic system to produce power, it needs BOTH pressure AND flow. So Jim is right in saying that you need a flow rater, combined with a pressure gauge. This is not a tool usually found farmer's toolboxes...
Note: a flow rater, combined with a pressure gauge is called an hydraulic system analyser.

Are there any remotes on this hydraulic system? If you had one or could jury rig one, you could attach some implement to it or attach the loader on an other tractor (put a round bale on it) to it and see if it really generates power (force AND speed).
If it falls short on power, I'll bet the pump is shot.

Good luck in finding the cause.
 
Paint it green and send it over to Tim S in the JD section. He does really well on the hydraulic issues.
 
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