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580sk case loader bucket won't raise or lower

Cliff
580SK backhoe 4in1 bucket was gradually getting harder to raise and lower and today it finally is stuck in the raised position, can't get it to lower, 4in1 jaws work fine only the raising and lowering function is not working. Before I start tinkering- anyone have this problem before or an idea of the problem?Thinking it is the loader control valve but not sure how to proceed. thanks

AJ Does the lever for the raise lower feel right,is it moving the valve in and out,check the linkage,is the engine tone changing when you use the raise/lower lever like when you use the 4-in-1,is there any damage to the lift cylinders or a bent rod,could be any of those things,when the slightest bit of trouble is noticed on hydraulics it has got to be fixed right away otherwise if there is anything adrift inside it goes around the whole system,be careful of the bucket dropping on you while you work on the machine.
AJ



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