Terex TS14G, Maintenance Manual

Page: 297 / 376

Section 250-0280
SM 1800 Rev1 04-04
1
BRAKING SYSTEM - Relay Emergency Valve
Fig. 2 - Operational View of Relay Emergency Valve
1 - Piston
2 - Piston
3 - Chamber A
4 - Inlet/Exhaust Valve
5 - Spring
6 - Inlet Seat
7 - Exhaust Seat
8 - Chamber B
9 - Chamber C
SM - 2259
DESCRIPTION
There are two relay emergency (anti-compounding)
valves fitted to the vehicle, one in the tractor lines and
the other in the scraper lines. The relay emergency
valves can be identified as items 7 and 19 in Section
250-0000, AIR BRAKING SYSTEM SCHEMATIC.
The front relay emergency valve is mounted off the
rear left hand side of the tractor frame, in front of the
air tanks. The rear relay emergency valve is mounted
off the left hand side of the bowl and tail frame,
adjacent to the fuel tank.
The relay emergency valves speed the application and
release of air pressure to and from tractor and scraper
brake chambers. The relay emergency valves are also
used as a means of preventing the force from the
spring brake and service diaphragm being applied to
the foundation brake at the same time.
Fig. 1 - Cutaway View of Relay Emergency Valve
1 - Valve Body - Upper
2 - 'O' Ring
3 - Piston - Upper
4 - 'O' Ring
5 - Distance Piece
6 - Piston - Lower
7 - Inlet/Exhaust Valve
8 - 'O' Ring
9 - Valve Body - Lower
10 - Spring Seat
11 - Spring
12 - 'O' Ring
SM - 2258
13 - 'O' Ring
14 - Circlip
15 - Valve Guide
16 - Exhaust Check Valve
17 - Circlip
18 - Valve Ring 19 - Valve Rubber
20 - Rivet
21 - Part Number Label
22 - Bolt
23 - Lockwasher
24 - Nut
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
24
23
17
18
19
22
21
20
9
8
7 6 5
4
3
2
1
42 41
1
3
2
a
b
c
Courtesy of Machine.Market