15-115-1TX / TXH / TXB 180S - 400L (Rev. 4/23/07)TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
depressed, the transmission will be disengageddepressed, the transmission will be disengaged
and wheel end and wheel end brakes applied. brakes applied. This allows This allows forfor
high engine speeds for greater hydraulic pumphigh engine speeds for greater hydraulic pump
output while reducing travel speed.output while reducing travel speed.
Shuttle ValveShuttle Valve (Illustration 15-8)(Illustration 15-8).. The shuttleThe shuttle
valve is used to isolate the hydraulic flow from thevalve is used to isolate the hydraulic flow from the
two brake valves.two brake valves.
Parking Brake ControlParking Brake Control (Illustration 15-1)(Illustration 15-1).. TheThe
parking brake control is located on the instrumentparking brake control is located on the instrument
panel and when pushed in, it energizes the park-panel and when pushed in, it energizes the park-
ing brake solenoid valve which supplies hydraulicing brake solenoid valve which supplies hydraulic
pressure to release the spring applied parkingpressure to release the spring applied parking
brake, disengaging the parking brake.brake, disengaging the parking brake. When theWhen the
replaced before the brake lining friction materialreplaced before the brake lining friction material
reaches a thicreaches a thickness of kness of .031 inch (.8 .031 inch (.8 mm). mm). TheThe
parking brake linings must be replaced in pairs.parking brake linings must be replaced in pairs.
BRAKE VALVESBRAKE VALVES
(Illustration 15-3)(Illustration 15-3)
MAIN PUMPMAIN PUMP
(Illustrat(Illustration ion 22-9)22-9)
PARKING BRAKEPARKING BRAKE
CONTROLCONTROL
(Illustratio(Illustration n 15-1)15-1)
MANIFOLDMANIFOLD
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