REV B
Section 4 • Repair Procedures
June 2005
4 - 34
TMZ-34/19
Part No. 52075
Hydraulic Power Unit
6-1
Hydraulic Power Unit Components
The hydraulic power unit is located under the side cover opposite the ground control side of the machine.
Index
Schematic
No.
Description
Item
Function
Torque
1
Hydraulic return filter ........................................ Filters oil returning to the tank
2
Diagnostic nipple ............................... D ........... Testing .................................................. 155 in-lbs / 17.5 Nm
3
Proportional valve, N.C. with
manual 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 Nm
4
24V DC electric motor ...................................... Operates hydraulic pump
5
Motor bearing ................................................... Aligns motor shaft into pump
6
Motor seal ......................................................... Seals motor from contaminants
7
Pressure relief valve .......................... F ........... System relief
8
Pump ................................................................ 0.75 gallons per minute @ 3000 psi, minimum
2.84 liters per minute @ 207 bar, minimum
9
Pick-up filter ...................................................... Filters hydraulic fluid entering the pump
10
O-ring ................................................................ Tank to pump seal
11
Sight gauge ...................................................... Hydraulic fluid level
12
Tank .................................................................. 6 quarts / 5.7 liters ..................................... 40 in-lbs / 4.5 Nm
13
Drain plug ......................................................... Drains tank ............................................... 250 in-lbs / 28 Nm
14
Breather cap ..................................................... Vent tank
15
Check valve ....................................... G ........... One way valve for pump output ............ 155 in-lbs / 17.5 Nm
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