Terex TS14G, Maintenance Manual

Page: 294 / 376

2
SM 1782 4-99
Braking System - Brake Chamber
Section 250-0260
OPERATION
Normal Driving
In its 'OFF' position, the park/emergency brake valve
maintains a constant air pressure on the spring brake
piston. The resulting compression of the power spring
holds off the vehicle brake. This system ensures that
the vehicle cannot be moved until sufficient air
pressure is available to hold off the power spring.
Refer to Fig. 2.
Parking Brake
Moving the park/emergency brake valve from the
'OFF' position towards the 'PARK' position gradually
releases the air pressure from the spring brake
chamber and allows the power spring to extend.
Progressive secondary braking is provided by the
increasing spring pressure on the service brake push
rod. At 'PARK' the air pressure has been fully
exhausted and the vehicle brake is held on by the
force of the power spring alone. Refer to Fig. 4.
Fig. 2 - Normal Driving
SM - 2193
Service Brake
The service brake chamber is of the conventional
diaphragm type. The vehicle service braking effort is
controlled by the foot operated treadle brake valve.
The valve supplies a graduable air pressure to the
service brake chamber while the spring brake
continues to be held off by air pressure from the
park/emergency brake valve. Refer to Fig. 3.
Fig. 3 - Service Brake
SM - 2194
Fig. 4 - Parking Brake
SM - 2195
Fig. 5 - Manual Release
SM - 2196
Manual Release
The readily accessible brake spring release bolt
allows the vehicle to be moved in the absence of air
pressure and permits the safe and speedy servicing
of the actuator and foundation brake. Refer to Fig. 5.
Courtesy of Machine.Market