Service and Repair Manual June 2017Manifolds98 SX-180 Part No. 12684978-1Function Manifold Components – View 1The function manifold is mounted next to the hydraulic tank on the ground control side of the machine.IndexNo. Description SchematicItem Function Torque1 Solenoid operated 2 position 2 waydirectional valve T Primary boom cylinder retract 33-37 ft-lbs /45-50 Nm2 Orifice, 0.025 in / 0.635 mm X3 Orifice, 0.025 in / 0.635 mm Z4 Solenoid operated 2 position 2 waydirectional valve U Secondary boom cylinder extend 33-37 ft-lbs /45-50 Nm5 Differential sensing valve, 150 psi / 10.3 bar IPrimary boom extend/retractcircuit, regulates pressure dropacross secondary boomextend/retract proportional valve33-37 ft-lbs /45-50 Nm6 Proportional solenoid operated 2 position2 way directional valve normally closed J Primary boom extend/retract,proportional speed control33-37 ft-lbs /45-50 Nm7 Solenoid operated 3 position 4 waydirectional valve W Primary boom extend/retract 19-21 ft-lbs /25.7-28.5 Nm8 Solenoid operated 3 position 4 waydirectional valve X Primary boom lift/ cylinder up/down 33-37 ft-lbs /45-50 Nm9 Proportional solenoid operated 2 position2 way directional valve normally closed L Primary lift cylinder up/down highspeed control33-37 ft-lbs /45-50 Nm10 Proportional solenoid operated 2 position2 way directional valve normally closed K Primary lift cylinder up/down lowspeed control19-21 ft-lbs /25.7-28.5 Nm11 Check valve, 5 psi / 0.34 bar VPrevents the draining of hydraulicoil from the jib manifold andplatform manifold19-21 ft-lbs /25.7-28.5 Nm12 Check valve, 5 psi / 0.34 bar A Pressure Circuit #2 19-21 ft-lbs /25.7-28.5 Nm13 Check valve, 5 psi / 0.34 bar B Pressure Circuit #1 19-21 ft-lbs /25.7-28.5 Nm14 Check valve, 5 psi / 0.34 bar D Prevents hydraulic pressure fromflowing back into auxiliary pump #219-21 ft-lbs /25.7-28.5 Nm
