REV BSection 4 • Repair Procedures June 20054 - 34 TMZ-34/19 Part No. 52075Hydraulic Power Unit6-1Hydraulic Power Unit ComponentsThe hydraulic power unit is located under the side cover opposite the ground control side of the machine.Index SchematicNo. Description Item Function Torque1 Hydraulic return filter ........................................ Filters oil returning to the tank2 Diagnostic nipple ............................... D ........... Testing .................................................. 155 in-lbs / 17.5 Nm3 Proportional valve, N.C. withmanual over ride knob ....................... E ........... Allows lowering of the boom ................. 155 in-lbs / 17.5 Nm— Coil nut (item E) .................................................................................................................... 5-7 ft-lbs / 7-9 Nm4 24V DC electric motor ...................................... Operates hydraulic pump5 Motor bearing ................................................... Aligns motor shaft into pump6 Motor seal ......................................................... Seals motor from contaminants7 Pressure relief valve .......................... F ........... System relief8 Pump ................................................................ 0.75 gallons per minute @ 3000 psi, minimum2.84 liters per minute @ 207 bar, minimum9 Pick-up filter ...................................................... Filters hydraulic fluid entering the pump10 O-ring ................................................................ Tank to pump seal11 Sight gauge ...................................................... Hydraulic fluid level12 Tank .................................................................. 6 quarts / 5.7 liters ..................................... 40 in-lbs / 4.5 Nm13 Drain plug ......................................................... Drains tank ............................................... 250 in-lbs / 28 Nm14 Breather cap ..................................................... Vent tank15 Check valve ....................................... G ........... One way valve for pump output ............ 155 in-lbs / 17.5 Nm800-610-4101ActionRental.com
