988G Wheel Loader Electrohydraulic System Caterpillar

Illustration 1	g00739999

The rotation of the shaft is counterclockwise when the pump is viewed from the drive end.

(1) Torque for the four bolts ... 70 ± 2.5 N·m (52.0 ± 1.8 lb ft)

Type: Gear Pump

For testing purposes, use SAE 10 oil at 65 °C (150 °F).

Test at Full Speed:

Output ... 76.4 L/min (20.2 US gpm)

Pressure ... 690 kPa (100 psi)

Pump rpm ... 2000 rpm

Engine rpm ... 2000 rpm

Output ... 68.8 L/min (18.2 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump rpm ... 2000 rpm

Engine rpm ... 2000 rpm

Test at Half Speed:

Output ... 38.2 L/min (10.1 US gpm)

Pressure ... 690 kPa (100 psi)

Pump rpm ... 1000 rpm

Engine rpm ... 1000 rpm

Output ... 34.4 L/min (9.1 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump rpm ... 1000 rpm

Engine rpm ... 1000 rpm