Terex TS14G, Maintenance Manual

Page: 302 / 376

Section 250-0280
Braking System - Relay Valve
2
SM 1794 4-99
REMOVAL/INSTALLATION
Numbers in parentheses refer to Fig. 1.
Note:
Tighten all fasteners to standard torques listed
in Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
WARNING
To prevent personal injury and property
damage, be sure wheel chocks, blocking
materials and lifting equipment are properly
secured and of adequate capacity to do the job
safely.
1. Position the vehicle in a level work area, apply the
parking brake and switch off the engine. Operate the
steering in both directions several times to relieve any
pressure in the steering system.
2. Block all road wheels and place the battery master
switch in the 'Off' position. Open drain cocks on air
tanks and drain air from all four air tanks. Close drain
cocks on air tanks when air is exhausted.
3. Clean relay valve (1) and surrounding area with a
suitable solvent. Ensure all lines connected to relay
valve (1) are identified for ease of installation and
disconnect lines. Fit blanking caps to all open lines
and ports.
4. Support valve body and remove bolts (2) and
lockwashers (3) securing relay valve (1) to it's
mounting. Remove relay valve (1) from vehicle.
5. Note location of adaptor (4), elbow (5), reducer (6)
and tee piece (7) and remove from relay valve (1) for
use on the new valve.
6. Replace all 'O' rings and install adaptor (4), elbow
* * * *
(5), reducer (6) and tee piece (7) in new relay valve (1)
ports as removed from the old valve.
7. Secure relay valve (1) to mounting bracket using
bolts (2) and lockwashers (3).
8. Remove blanking caps from air lines and
install lines to relay valve (1) as identified during
removal.
9. Place master switch in the 'On' position, start the
engine and allow air pressure in the tanks to build up
to correct operating pressure. Check for leaks at air
lines and tighten as required.
10. Remove wheel blocks.
MAINTENANCE
Inspect the relay valve regularly for any signs of
leakage or damage and repair/replace as required.
Note:
Limited repair of the relay valve is by
replacement of parts only. Refer to vehicle Parts Book
for part numbers of kits.
Leak Checking
Block all road wheels, ensure air tanks are fully
charged and apply the parking brake. Apply a soap
solution to the valve housing and pipe joints and check
for leakage. No leakage is permitted from the valve
housing or joints.
SPECIAL TOOLS
There are no special tools required for procedures
outlined in this section. Refer to Section 300-0070,
SERVICE TOOLS, for part numbers of general service
tools required. These tools are available from your
dealer.
Courtesy of Machine.Market