773D Off-Highway Truck and 775D Quarry Truck Hydraulic System Caterpillar

Illustration 1	g00513649

Rotation of the pump is clockwise when the pump is viewed from the drive end.

Type of pump: Gear

Bench test requirements: SAE 10W oil must be stabilized at 66°C (151°F) before the test is performed.

Drive End

Test at Full Speed:

Output ... 492 L/min (130.0 US gpm)

Test pressure ... 689 kPa (100 psi)

Test speed of engine ... 2000 rpm

Test speed of pump ... 2100 rpm

Output ... 490 L/min (129.5 US gpm)

Test pressure ... 6895 kPa (1000 psi)

Test speed of engine ... 2000 rpm

Test speed of pump ... 2100 rpm

Test at Half Speed:

Output ... 237 L/min (62.5 US gpm)

Test pressure ... 689 kPa (100 psi)

Test speed of engine ... 1000 rpm

Test speed of pump ... 1050 rpm

Output ... 235 L/min (62.0 US gpm)

Test pressure ... 6895 kPa (1000 psi)

Test speed of engine ... 1000 rpm

Test speed of pump ... 1050 rpm

Cover End

Test at Full Speed:

Output ... 100 L/min (26.5 US gpm)

Test pressure ... 689 kPa (100 psi)

Test speed of engine ... 2000 rpm

Test speed of pump ... 2100 rpm

Output ... 97 L/min (25.5 US gpm)

Test pressure ... 5516 kPa (800 psi)

Test speed of engine ... 2000 rpm

Test speed of pump ... 2100 rpm

Test at Half Speed:

Output ... 50 L/min (13.2 US gpm)

Test pressure ... 689 kPa (100 psi)

Test speed of engine ... 1000 rpm

Test speed of pump ... 1050 rpm

Output ... 45 L/min (12.0 US gpm)

Test pressure ... 5516 kPa (800 psi)

Test speed of engine ... 1000 rpm

Test speed of pump ... 1050 rpm

(1) Torque for eight bolts ... 228 ± 10 N·m (168 ± 7 lb ft)

(2) Torque for four nuts ... 115 ± 7 N·m (85 ± 5 lb ft)

Note: Assemble the shaft seals with the spring loaded member that is opposite each other.