February 2017 Service ManualManifoldsPart No. 1259369GT S-80 • S-85 • S-80X 119How to Adj ust the Boom Ex tend R elief ValveHow to Adjust the Boom ExtendRelief ValveNote: Perform this procedure with the boom in thestowed position.Note: Refer to Function Manifold Component list tolocate the boom extend relief valve.1 Connect a 0 to 3000 psi / 0 to 200 barpressure gauge to the diagnostic nipplelocated next to the auxiliary pump.2 Start the engine from the ground controls.3 Hold the function enable/rpm select toggleswitch to the high idle position and activateand hold the boom extend toggle switch withthe boom fully extended. Observe thepressure reading on the pressure gauge.Refer to Specifications, HydraulicSpecifications.4 Turn the engine off. Use a wrench to hold therelief valve and remove the cap on the functionmanifold.5 Adjust the internal hex socket. Turn itclockwise to increase the pressure orcounterclockwise to decrease the pressure.Then install the relief valve cap.Tip-over hazard. Do not adjustthe relief valve higher thanspecified.6 Repeat steps 2 through 5 and recheck reliefvalve pressure.7 Remove the pressure gauge.
