COMPRESSED AIR AND BRAKE SYSTEM OPERATION (Contd)
WINDSHIELD WIPER CONTROL SWITCH - Opens air pressure valve in wiper motor to operate wipers.
WINDSHIELD WIPER MOTOR - Air-actuated motor powers windshield wipers.
WINDSHIELD WASHER CONTROL - Spring-loaded valve that allows air pressure to force washer fluid from
washer reservoir to windshield.
WINDSHIELD WASHER RESERVOIR - Container for windshield washer fluid.
ACCESSORY MANIFOLD - Receives air pressure from the pressure protection valve and distributes it to the
FRONT-WHEEL DRIVE LOCK-IN SWITCH - Air-actuated switch that engages front-wheel drive when transfer
case is in HIGH.
WINDSHIELD WASHER NOZZLES - Direct washer fluid on windshield.
GOVERNOR - Serves as a tee between accessory manifold and horn relay valve. It also signals the air
compressor to stop compressing air for the supply system when operating pressure has been reached.
TRANSFER CASE AIR SHIFT CYLINDER - Engages front-wheel drive when it receives air pressure from lock-in
switch or engagement control valve.
FRONT AXLE ENGAGEMENT CONTROL VALVE - Operates off cam on transfer case shift linkage so front-
wheel drive engages automatically when transfer case is put into LOW.
HORN RELAY VALVE - Electrical signal from horn button on steering wheel opens valve in horn relay, allowing air
pressure to sound horns.
HORNS - Receive air pressure from horn relay valve to sound off.