Challenger 35, Challenger 45 and Challenger 55 Agricultural Tractors Implement, Steering and Brake Hydraulic Systems Caterpillar

Illustration 1	g00289139

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

Type of pump: Gear Pump (two sections)

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

Reference: See Systems Operation/Testing and Adjusting, "Pump Effeciency Check".

(1) Transmission Charge Pump (Drive End Section)

Test at Rated Engine Speed

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

Pump speed ... 2667 rpm

Pressure ... 2070 kPa (300 psi)

Engine speed ... 2100 rpm

Test at Half Engine Speed

Output ... 57.5 L/min (15 US gpm)

Pump Speed ... 1333 rpm

Pressure ... 2070 kPa (300 psi)

Engine Speed ... 1050 rpm

(2) Charge Pump for the Steering System and Implement System (End Section)

Test at Rated Engine Speed

Output ... 242 L/min (64 US gpm)

Pump speed ... 2667 rpm

Pressure ... 345 kPa (50 psi)

Engine speed ... 2100 rpm

Test at Half Engine Speed

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

Pump Speed ... 1333 rpm

Pressure ... 345 kPa (50 psi)

Engine Speed ... 1050 rpm

(3) Torque for eight bolts ... 78.5 N·m (57.8 lb ft)