776D, 777D and 777D HAA Off-Highway Truck/Tractors Air System and Brakes Caterpillar


Electric Drive Pump (Secondary Steering and Brake Release)

Usage:

777D 2YW



Illustration 1g00720489

(1) Hydraulic pump for secondary steering

Bench test specifications
Oil ... SAE 10W
Stabilized oil temperature ... 66 °C (150 °F)
Pump output ... 20.4 L (5.4 US gal)
Pressure ... 13800 kPa (2002 psi)

(2) Hydraulic pump for parking and secondary brake release

Bench test specifications
Oil ... SAE 10W
Stabilized oil temperature ... 66 °C (150 °F)
Pump output ... 20.4 L (5.3891 US gal)
Pressure ... 4100 kPa (595 psi)

(3) Electric motor for pump

Bench test specifications
Current that is required to run the hydraulic pump for secondary steering (1) ... 383 A
Current that is required to run the hydraulic pump for parking and secondary brake release (2) ... 136 A
Nominal voltage ... 24 V

(4) Torque for two nuts ... 19 ± 1 N·m (168 ± 9 lb in)

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