4 - 68 Z-80/60 Part No. 88619June 2011Section 4 • Repair ProceduresREV D8-3Valve Adjustments -Function ManifoldHow to Adjust the SystemRelief ValveNote: Perform this procedure with the boom in thestowed position.1 Locate the boom retracted limit switch(LSP1RO) limit switch on the outside of theprimary boom at the pivot end of the primaryboom.2 Tag and disconnect the wire harness from thelimit switch, and install a wire jumper betweenpins 1 and 2 of the limit switch connector. Placeanother wire jumper between pins 3 and 4 ofthe limit switch connector.3 Connect a 0 to 5000 psi / 0 to 350 bar pressuregauge to the PTEST port on the functionmanifold.4 Start the engine from the ground controls.5 Press and release the rpm select button untilthe engine changes to high idle.6 Simultaneously push and hold the functionenable/high speed button and the primary boomretract button with the primary boom fullyretracted. Observe the reading on the pressuregauge. Refer to Section 2,Specifications.MANIFOLDS7 Turn the engine off. Use a wrench to hold therelief valve and remove the cap (item AJ).8 Adjust the internal hex socket. Turn it clockwiseto increase the pressure or counterclockwise todecrease the pressure. Install the relief valvecap.Tip-over hazard. Do not adjustthe relief valve higher thanspecified.9 Repeat steps 4 through 8 confirm the reliefvalve pressure.10 Remove the pressure gauge.11 Remove the wire jumpers from the limit switchconnector.12 Securely install the LSP1RO pig tail into thewire harness.How to Adjust the Primary BoomDown Relief ValveNote: Perform this procedure with the boom in thestowed position.1 Connect a 0 to 5000 psi / 0 to 350 bar pressuregauge to the LS port on the function manifold.2 Start the engine from the ground controls.3 Press and release the rpm select button untilthe engine changes to high idle.4 Raise the primary boom approximately5 feet / 1.5 m.12345678901234567890123123456789012345678901231234567890123456789012312345678901234567890123REV E
