D6N Track-Type Tractor Hydraulic System Caterpillar

Illustration 1	g00868597
The rotation of the pump is counterclockwise when the pump is viewed from the drive end.

The pump is a variable displacement piston pump.

When you test, use oil that is at the temperature of 65 °C (150 °F).

Maximum system pressure ... 25000 ± 350 kPa (3626 ± 51 psi)

Margin pressure ... 1700 ± 100 kPa (245 ± 15 psi)

Maximum standby pressure ... 3400 kPa (495 psi)

Test at 2200 RPM Pump Speed

Output ... 135 L/min (36 US gpm)

Pressure ... 6900 kPa (1000 psi)

Engine speed ... 2088 rpm

Test At 1100 RPM Pump Speed

Output ... 67 L/min (17.7 US gpm)

Pressure ... 6900 kPa (1000 psi)

Engine speed ... 1044 rpm

(1) Torque for screw ... 5 N·m (44 lb in)

Apply 4C-4032 Sealant to the threads of screw (1) .

(2) 168-2197 Spring

Length under test force ... 43.5 mm (1.71 inch)

Test force ... 161 ± 10 N (36 ± 2.2 lb)

Free length after test ... 65 mm (2.6 inch)

Outside diameter ... 23.3 mm (0.92 inch)

(3) Torque for plug ... 190 N·m (140 lb ft)

(4) 168-3381 Spring

Length under test force ... 38 mm (1.5 inch)

Test force ... 704 ± 29 N (160 ± 6.5 lb)

Free length after test ... 66.5 mm (2.6 inch)

Outside diameter ... 41 mm (1.6 inch)

(5) Torque for bolt ... 165 N·m (121 lb ft)