994D Wheel Loader Hydraulic System Caterpillar

Illustration 1	g00278184

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

Type: Gear Pump

For the test, use SAE 10W oil that is at 65°C (150°F).

Drive end of the pump (Oil cooling)

Test at full speed:

Output ... 250 L/min (66 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1710 rpm

Engine speed ... 1600 rpm

Output ... 225 L/min (59 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1710 rpm

Engine speed ... 1600 rpm

Test at half speed:

Output ... 125 L/min (33 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 855 rpm

Engine speed ... 800 rpm

Output ... 112 L/min (30 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 855 rpm

Engine speed ... 800 rpm

Cover end of the pump (Pilot oil)

Test at full speed:

Output ... 80 L/min (21 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 1710 rpm

Engine speed ... 1600 rpm

Output ... 72 L/min (19 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 1710 rpm

Engine speed ... 1600 rpm

Test at half speed:

Output ... 40 L/min (11 US gpm)

Pressure ... 690 kPa (100 psi)

Pump speed ... 855 rpm

Engine speed ... 800 rpm

Output ... 36 L/min (10 US gpm)

Pressure ... 6900 kPa (1000 psi)

Pump speed ... 855 rpm

Engine speed ... 800 rpm

(1) Torque for the eight bolts ... 85 ± 5 N·m (63 ± 4 lb ft)