623E Wheel Tractor-Scraper Hydraulic System Caterpillar

Illustration 1	g00925433

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

Use SAE 10W oil at 66°C (150°F) for the test.

Note: The following specifications are for a bench test. The specifications for a pump that is tested on the machine may be different.

(1) Steering Section (Cover End)

Test at full speed:

Output ... 220 L/min (58 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 2000 rpm

Engine speed ... 2000 rpm

Output ... 209 L/min (55 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 2000 rpm

Engine speed ... 2000 rpm

Test at half speed:

Output ... 110 L/min (29 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1000 rpm

Engine speed ... 1000 rpm

Output ... 104 L/min (27 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1000 rpm

Engine speed ... 1000 rpm

(2) Implement Section (Drive End)

Test at full speed:

Output ... 240 L/min (63 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 2000 rpm

Engine speed ... 2000 rpm

Output ... 228 L/min (60 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 2000 rpm

Engine speed ... 2000 rpm

Test at half speed:

Output ... 220 L/min (58 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1000 rpm

Engine speed ... 1000 rpm

Output ... 114 L/min (30 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1000 rpm

Engine speed ... 1000 rpm

(3) Torque for four bolts ... 359 ± 14 N·m (265 ± 10 lb ft)

(4) Install the bronze face of the flex plate toward the rotor.

(5) Torque for bolts ... 11 ± 1 N·m (8 ± 1 lb ft)