my clark c55 ys80 forklift wont lift as heavy as it should. It is rated at 8000 lbs and it would not lift 6000. I could rev the engine and pull the lift lever and it would lift about 1/2 inch at a time and then nothing. How do I tell if it's the pump or valve or ram. Also the power steering doesn't work properly. It has a seperate p/s pump with a hydraulic ram on the steering link. How do I diagnose?
Model: c500 ys80
Engine: 6 cyl continental
Ichanged the hydraulic fluid and filter.
The hydraulic pressure needs to be checked at the main control valve. It has a check port on the inlet side of the valve. The pressure needs to be about 2300psi, with the tilt cylinder bottomed on in tilt back position. The relief valve is also at the inlet side of the control valve. It should be adjustable, with set screw under a acorn nut. If screwing in the nut does nothing to raise the pressure, the pump is weak.
The power steering has to have about 1200 psi, and you have to tee into a steering line to test the pressure.
Does the steering have any power ? or is it erratic?
Let me know. Thank you.
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I just bought the lift knowing the steering was bad but it actually worked for a while yesterday and then stopped again.
If the steering worked once, it should work again. This is usually the steering valve in the end of the steering cylinder. correct me if i'm wrong, but I think this unit has a standard steering gear and has no hoses to the gear. The hoses go direct from the steering pump to the valve in the end of the steering cylinder. The gearbox has to move the valve in the end of the cylinder. Only moves about 1/4 in total. Very touchy, and very hard to get right! Check mounting of the cylinder, especially at the frame end, it has to be tight so it does not have any slack.
Technican turned service manager on multiple lines of equipment used in industry.