623E Wheel Tractor-Scraper Hydraulic System Caterpillar

Illustration 1	g01089258

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

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

This is a vane pump.

For the test, use SAE 10W oil that is at 66° ± 4°C (150° ± 7°F).

(1) Torque for four bolts ... 95 ± 7 N·m (70 ± 5 lb ft)

(2) Torque for four bolts ... 200 ± 14 N·m (150 ± 10 lb ft)

Implement Section of Pump (Drive End)

Test at full speed:

Output ... 210 L/min (55 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1900 rpm

Engine speed ... 1900 rpm

Output ... 190 L/min (51 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1900 rpm

Engine speed ... 1900 rpm

Test at half speed:

Output ... 105 L/min (28 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 950 rpm

Engine speed ... 950 rpm

Output ... 90 L/min (24 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 950 rpm

Engine speed ... 950 rpm

Elevator Section of Pump (Cover End)

Test at full speed:

Output ... 115 L/min (30 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1900 rpm

Engine speed ... 1900 rpm

Output ... 105 L/min (28 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1900 rpm

Engine speed ... 1900 rpm

Test at half speed:

Output ... 60 L/min (16 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 950 rpm

Engine speed ... 950 rpm

Output ... 50 L/min (13 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 950 rpm

Engine speed ... 950 rpm