squealing hydraulics

Chillimau · Apr 7, 2004

I have a ym147 that the hydraulics squeal when you lift the 3 pt. I changed the hydraulic oil and filter under the transmission and checked the screen at the back of the transmission everything looked clean nothing on the screen. Seems to make more noise when it is warmed up. The fluid is the proper fluid according the owners manual. The only thing I am lifting at the moment is a 60" belly finish mower. I would think it wouldn't even notice that. I have used a 4ft brush hog with it and it does seem to notice that when lifting.

I can hold my foot on the sheet metal that covers the tranmission hump and quiet it down some but you still hear a moaning sound. I am guessing hydraulic pump? Anybody else have anythoughts?

lens12 · Apr 7, 2004

It sounds like a starving pump, but you have done most of the obvious things. There are a couple hoses in the suction line. Check to make sure that they aren't being sucked in & starving the pump.

normde2001 · Apr 7, 2004

Does that machine have a stop valve to lock the 3ph in a fixed position for servicing? I had that problem once when mine got partially closed by accident.

Chillimau · Apr 7, 2004

I do have a valve to control how fast the 3 pt falls. I never thought about totally closing it to hold the 3pt. I have adjusted it for the brush hog so I don't bang it on the cement or trailer floor. I will try opening that up some and see if that changes anything. I have overloaded the 3pt one time a while back and know what the sound of that is when the pump can't lift against the arms. That was louder than what I am hearing and was more of a screeching sound.

Len, I will check those supply hoses. I think I remember seeing one of them, best I remember it was about the diameter of a small radiator hose coming into the hydraulic pump.

normde2001 · Apr 7, 2004

There should be 2 valves, one that works as you describe, operated by a small lever, probably with a red handle, under the seat to control drop speed. The other, a round knob down by your feet that should be either fully open or closed to lock the 3ph in position.

California · Apr 7, 2004

Novice's questions: I don't understand the 3-point control and drop rate valves.

The guy who sold me the tractor told me the loader curl control didn't work when the 3-point was raised. This weekend I got an opportunity to test it. I'm still confused.

I used the loader to dig out an old garden 2 ft deep. It seemed that the loader's lift and bucket curl were less powerful when I had my rotary mower on the back, and raised, to serve as a counterweight. I set both the round knob and the small drop lever wide open. Is less hydraulic power available to the loader when the 3-point is raised?

Pushing the 3-point lift handle (right side of seat) all the way back put noticeable strain on the engine and flexed the hydraulic hoses (into the loader controls) rigid. Backing off an inch from full lift reduced the strain but still seemed to put a minor load on the engine. Is this normal?

Is it reasonable to use the 3-point, in the up position, for a counterweight such as mower or weight box? Or should a counterweight be suspended from a chain to take the load off the hydraulics?

And: is one of the knobs intended to hold only the three-point up while leaving the loader unaffected? Which one? Would this eliminate the strain I noticed with the counterweight lifted? I've read the operation manual, and I'm still confused.

Thanks for any comments!

(Attachment, above: excavation in progress.)

EM_in_Ohio · Apr 7, 2004

California
I have a huge cement counterweight that I carry in the up position all of the time. I open the round shutoff knob about one turn, raise the 3 pt, close the round shutoff valve, then put the lift lever in the down position. The 3pt is then liquid locked in the up position, and the rest of the hydraulic system is free to do what ever I need. If you leave the lever in the up position, there is a definite squeel and slow loader operation. E.M.

B2400 · Apr 7, 2004

California, it sounds as though your position control is out of adjustment. I frequently use a 415# box blade as counter balance on my Kubota B2400 and have never encountered the trouble you describe. The only time your three point uses hydraulic fluid is when you're lifting. The position control mechanism should hold the load in a static position and thus not draw on your flow capacity unless the position of implement is changed. It should not affect the loader unless you use them both at the same time. I would have the position control end points looked at and adjusted by a mechanic or consult a workshop manual for the proper procedure.

normde2001 · Apr 8, 2004

Get yourself a set of "stay chains" to support whatever you are using as rear ballast and you won't have to worry about it.

jasonwolfington · Dec 8, 2006

I have a yanmar 1610 that also squeals when the rear lift is all the way up and I try to use the loader. Is there any fix for this problem, or should I learn to live with having the rear less than all the way up when I use the loader?

TIA