776D, 777D and 777D HAA Off-Highway Truck/Tractors Air System and Brakes Caterpillar

Illustration 1	g00030762

(1) Check Valve

(2) Assemble the relief valve for the air dryer so that the vent is facing downward.

(3) Torque for the nut ... 2.8 ± 0.6 N·m (25 ± 5 lb in)

While the heater of the air dryer is in the ON position and the operating temperature on the machine is decreasing, the following specifications will occur:

Draw Amps at 24 VDC ... 5.0 Amps

Decreasing operating temperature ... 7° ± 6°C (45° ± 10°F)

While the heater of the air dryer is in the OFF position and the operating temperature on the machine is increasing, the following specifications will occur:

Draw Amps at 24 VDC ... 0.0 Amps

Increasing operating temperature ... 30° ± 6°C (86° ± 11°F)