416C, 426C, 428C, 436C and 438C Backhoe Loaders Hydraulic and Steering System Caterpillar

161-6634 Piston Pump

Illustration 1	g00531268

When the pump is viewed from the drive end, the rotation of the pump is in a clockwise direction.

Displacement of the pump ... 75 cc/rev (4.6 cu in/rev)

Pressure setting ... 20700 ± 350 kPa (3000 ± 50 psi)

While you are testing the pump use SAE 10 oil at 66°C (150.8°F).

Test the pump at full speed.

engine speed ... 2200 rpm

pump speed ... 2200 rpm

Output flow ... 156 L/min (41.2 US gpm)

Output pressure ... 20700 ± 350 kPa (3000 ± 50 psi)

Margin pressure ... 2100 ± 100 kPa (305 ± 15 psi)

Maximum low pressure standby ... 3150 kPa (457 psi)

(1) Torque of four head bolts ... 165 ± 30 N·m (120 ± 22 lb ft)

(2) Torque of plug ... 105 ± 10 N·m (80 ± 5 lb ft)

(3) Torque of the locknut on the torque limiter ... 12 ± 3 N·m (9 ± 2 lb ft)