ROAMER_AUS
Well-Known Member
Hi everyone.
I have truck mounted crane as per title. I have a problem where crane swings normaly to one side, but barely moves to the other side. On top of that, after about 7-10 full range swings left - right and back, oil becames so hot that you can't keep your hand on the tank. Swing cylinders get quite warm too. I have checked all the usual things, enought oil present, filter is new. I have tried swinging the crane by hand with cylinder hoses taken off, and it moves smoothly.
Does anybody know what would heat up the oil so quickly? About 70 litres is in whole system.
Now my taught was that one cylinder is passing. But, also there are either pressure regulating or overpressure protection valves for both sides of swing, I don't know what they are for exactly, no marking on them. Rreturn pipe from this valve gets hot, which means that valves are opening and sending oil back to the tank. Cylinder passing and overpressure valves opening is a bit contradictoy to me.
Can anyone help me to diagnose this problem a bit better? My first concern is that oil gets so hot so quickly. And second obviously swing problem. But they are same root cause I guess.
Thank you!
I have truck mounted crane as per title. I have a problem where crane swings normaly to one side, but barely moves to the other side. On top of that, after about 7-10 full range swings left - right and back, oil becames so hot that you can't keep your hand on the tank. Swing cylinders get quite warm too. I have checked all the usual things, enought oil present, filter is new. I have tried swinging the crane by hand with cylinder hoses taken off, and it moves smoothly.
Does anybody know what would heat up the oil so quickly? About 70 litres is in whole system.
Now my taught was that one cylinder is passing. But, also there are either pressure regulating or overpressure protection valves for both sides of swing, I don't know what they are for exactly, no marking on them. Rreturn pipe from this valve gets hot, which means that valves are opening and sending oil back to the tank. Cylinder passing and overpressure valves opening is a bit contradictoy to me.
Can anyone help me to diagnose this problem a bit better? My first concern is that oil gets so hot so quickly. And second obviously swing problem. But they are same root cause I guess.
Thank you!