973D Track-Type Loader Power Train Hydrostatic Drive Motor Caterpillar

Illustration 1	g01946666

Rotation ... Bidirectional

Maximum displacement per revolution ... 280 cc (17 cubic inch)

Minimum displacement per revolution ... 70 cc (4 cubic inch)

Flow at a pressure drop of 700 kPa (102 psi) and at a temperature of 40 °C (104 °F) ... 68 L/min (18 US gpm)

(1) Torque for the O-ring plug ... 198 N·m (146 lb ft)

Note: Apply 4C-4030 Thread Lock Compound to the threads of the screws.

(2) Torque for 18 screws ... 15.5 ± 1.5 N·m (137.2 ± 13.3 lb in)

Motor Head Group

Illustration 2	g01946668
(3) Pilot valve group

(4) Torque for eight bolts ... 310 N·m (229 lb ft)

(5) Torque for two O-ring plugs ... 147 N·m (108 lb ft)

Illustration 3	g01946670
Pilot valve group

(6) Torque for the O-ring plug ... 25 N·m (221 lb in)

(7) Torque for four bolts ... 215 N·m (159 lb ft)

(8) Solenoid assembly

Torque for the solenoid assembly ... 19 N·m (168 lb in)

Torque for the cap ... 5 N·m (44 lb in)

Coil resistance at 20 °C (68 °F) ... 4.26 Ohms

Operating voltage ... 12 or 24 VDC

(9) Torque for the adjustment nut ... 44 N·m (32 lb ft)

(10) Torque for the cap nut ... 44 N·m (32 lb ft)