773G and 775G Off-Highway Truck Steering System Caterpillar

Illustration 1	g02485297

Specifications

Maximum operating pressure ... 21550 kPa (3126 psi)

Maximum flow ... 160 L/min (42.27 US gpm)

The setting for the primary relief valve (8) at a flow rate of 8 ± 2 L/min (2.1 ± 0.5 US gpm) at a temperature of 49° ± 3°C (120° ± 5°F) ... 260 ± 4 bar (3770 ± 58 psi)

Maximum flow rate for the secondary steering system ... 30 L/min (7.9 US gpm)

The setting for the relief valve (1) for the secondary steering system at a flow rate of 19 ± 2 L/min (5 ± 0.5 US gpm) at a temperature of 49° ± 3°C (120° ± 5°F) ... 173 ± 4 bar (2509 ± 58 psi)

The cracking pressure for the check valves (3) ... 35 kPa (5 psi)

Operating temperature range for the oil ... -40° C to 120° C (-40° F to 248° F)

Ambient temperature range ... −40° to 43° C (−40 to 109 ° F)

Maximum allowable leakage at a pressure of 5600 ± 70 kPa (812 ± 10 psi) at a temperature of 27° C (81° F) ... 100 mL/min (3.4 oz/min)

(1) The relief valve for the secondary steering system

(2) The maximum torque for the diverter valve group ... 33.9 N·m (25 lb ft)

(3) Tighten the two check valves to a maximum torque of 135 N·m (100 lb ft)

(4) Torque for the solenoid valve group ... 27.2 ± 1.4 N·m (20 ± 1 lb ft)

(5) Torque for the nut ... 6.1 ± 0.7 N·m (54 ± 6 lb in)

(6) Maximum torque for the diverter valve group ... 94.6 N·m (70.0 lb ft)

(7) Torque for the shuttle valve ... 35.0 ± 1.5 N·m (26 ± 1 lb ft)

(8) Torque for the primary relief valve ... 35.4 ± 1.5 N·m (26 ± 1 lb ft)

(9) The maximum torque for the check valve is 27.1 N·m (20 lb ft).