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Message: <blockquote data-quote="irvi00" data-source="post: 38228" data-attributes="member: 3948"><p>All right, I have a standard L555 with a perkins engine, and I assume the hydraulics are the same as your machine.  First, the safety switch is under the seat, it's just a simple pressure switch that recognizes weight in the seat.  Check it out, but I don't think thats your problem.  Second, change out the hydraulic filters in the engine compartment, one big one and one small one mounted up on the firewall.  Third, you have already checked and cleaned the suction strainer. Fourth culprit will be the control valve, located behind the shroud at your left foot.  A rebuild is cheap, removing and replacing the valve is a booger.  Finally will be the gear pump.  From the engine there are three pumps in a series, first two are the drive pumps, on the front is a small gear pump bout the size of your fist.  This pump delivers fluid for the boom and tilt.  The only cure for it is replacement.  You say you can hear the pump "struggling", that is probably starving for fluid, which means clogged filters or low pressure delivered from control valve.  Mine once had the problem you describe, it was the relief valve in the control valve body.  If you have to remove the valve might as well rebuild the whole thing anyway, not a hard job and a kit is cheap.  I understand your concern with cost of a manual, but a service manual is GOLD.</p></blockquote><p></p>