TM 5-3805-263-14&P-3
AIR SYSTEM AND BRAKES
Disassemble quick release valve and inspect diaphragm
(5) for wear or cracking.
Contact surface of the
When the control lever is moved to the brake OFF
diaphragm should be free of pits or grooves. Inspect
position, pressure air is available to rotochamber (12).
seats on body (6) and cover (3).
The pressure air, working against the force of the spring
in the rotochamber, will move the lever (11) down. This
causes the lever inside of the transmission to move
PARKING BRAKE
piston (1) away from plates (4) and discs (5). Discs (5)
The location of the parking brake is around the No.7
are then free to rotate with ring gear (8).
clutch in the planetary group of the transmission. The
parking brake is made up of piston (1), plates (4) and
discs (5). Discs (5) are connected to ring gear (8) of the
No.7 clutch. Plates (4) are connected to housing (6) by
pins and can not turn. Ring gear (8) is connected to the
pinion in the differential. Lever (11) is connected to
another lever inside of the transmission housing. This
lever fits in a slot in piston (1).
In the PARK position, no pressure air is available to
rotochamber (12). The spring in the rotochamber will
move lever (11) up. This causes the lever inside of the
transmission to turn piston (1). As the piston turns, balls
(10) move up the taper of inserts (9). The piston is
moved into contact with plates (4) and discs (5). The
piston pushes the plates and discs against housing (6).
LEVER TO PARKING BRAKE
As the friction between the plates and discs becomes
11. Lever. 12. Rotochamber.
greater, ring gear (8) is stopped. Since the ring gear is
connected to the pinion in the differential through output
ROTOCHAMBER FOR PARKING BRAKE
flange (7), the machine can not move.
When the safety lever is pushed to the PARK position,
pressure air in air compartment (4) is released through
port (5) to the exhaust port in the quick release valve.
Spring (1) then moves piston (2), sleeve (4) and rod (7)
to the right. A rod end on rod (7) is connected to the
parking brake lever on the side of the transmission. As
rod (7) moves into housing (6), the parking brake lever is
moved
PARKING BRAKE IN PLANETARY
GROUP OF TRANSMISSION
1. Piston. 2. Plunger. 3. Spring. 4. Plates. 5. Discs.
6. Housing. 7. Output flange. 8. Ring gear of No.7
clutch. 9. Inserts. 10. Balls.
3-121
