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350U hydraulic problem

T

Tom Dowling

Member
I have a 350 utility And was grading with the rear blade when the 2-point stopped working with the blade up. Now it wont move up or down, engine on or off. I raised the blade it made no strange sounds just stopped working. Before I start guessing does anyone have any idea why? Maybe a bad relief valve or sheared pump shaft?
Anyone ever have this happen to them? Any help would be greatly appreciated.
 
If the controls are like on a 300U you could have a stripped out control and it is not moving the hyds control like it should. Had that problem on a 300U and drilled and put a roll pin in top fix the problem
 
The control handles can fail. It will feel like a dead chicken leg if it is stripped at the control.
If it feels Normal, does the engine bog a little when attempting to raise or lower, If so the safety valve in the cylinder might have gotten stuck. If it does not it is in the inside hydraulics. The pump drives the distributor, so the shaft is OK. The key on the shaft turning the gears in the pump could be sheared, (not high likelyhood). The suction screen could be blocked, or the tiny regulator valve and screen could be stuck. Keep us informed. Put blocking under the blade or take it off before relieving pressure! Jim
 
The control handles can fail. It will feel like a dead chicken leg if it is stripped at the control.
If it feels Normal, does the engine bog a little when attempting to raise or lower, If so the safety valve in the cylinder might have gotten stuck. If it does not it is in the inside hydraulics. The pump drives the distributor, so the shaft is OK. The key on the shaft turning the gears in the pump could be sheared, (not high likelyhood). The suction screen could be blocked, or the tiny regulator valve and screen could be stuck. Keep us informed. Put blocking under the blade or take it off before relieving pressure! Jim
 
The only thing I can add is the obvious.
If it has PS is it working. Do you have other cylinders on the tractor and are they working. If so, the control lever is highly suspect.

Dell
 
Thanks for the help,
The motor used to bog a little whenever you moved the lever up or down, now it doesn't so I'm thinking the lever may be sheared. I'll report what I find, Thanks again. Tom
 
Does anyone know of any online diagrams for the hydraulic valves on a 350 utility? I would feel alot better about taking it apart with a picture of it disassembled. Thanks for any help. Tom Dowling
 
Well it wasn't the easy stuff thats messed up.the shaft is not stripped so next i'll try the safety valve screen then the suction screen.
Thanks, Tom Dowling
 
I hope you have it figured out by now. If you were here in Maine today, you"d need the 400 with the blade to get the 14 inches of new snow pushed off!

My thought is a bent or broken part inside the case. You"ll need to take the top cover off. Good luck little brother!
 
Thank You for the tips, I found my old manual for the 400 in the shed and it has a diagram of the safety valve block and instructions to disassemble it. I took the cover off, removed #11 and cleaned it, reassembled it and it works!!! Thanks again---Tom Dowling
 
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