Operation and maintenance manual

Section 250-0050
SM 2158 7-02
3
T
P
A
3
2
B
P1
PY
ACC1
ACC2
PS1
PS2
PS3
P2
P
SM - 2751
Braking System - Brake Manifold Valve
battery master switch in the 'Off' position.
3. Remove and tag electrical connections to solenoid
coil (3) and pressure switch (20).
4. Clean brake manifold valve assembly and
surrounding area with a suitable solvent. Ensure all
hydraulic lines connected to the brake manifold valve
are identified for ease of installation and, with suitable
containers available to catch leakage, disconnect
hydraulic lines. Fit blanking caps to all open lines.
5. Release and remove mounting hardware securing
brake manifold valve to cradle assembly at rear of cab.
Remove assembly from the vehicle.
DISASSEMBLY
Numbers in parentheses refer to Fig. 1.
1. Clamp valve body (1) lightly in a soft jawed vice,
retainers (6) face up. Do not overtighten jaws. Remove
retainers (6) from valve body (1) and discard 'O' rings
(7).
2. Remove plug (5) from valve body (1) and discard 'O'
ring (18).
3. Carefully remove valve body (1) assembly from the
vice and remove springs (8) and check balls (9) from
valve body (1).
4. If required, clamp valve body (1) lightly in soft jawed
vice and remove check ball seats (10).
5. Rotate valve body (1) in vice until solenoid coil (3) is
facing up. Lightly clamp valve body (1) in vice and
remove locknut (4) and solenoid coil (3) from solenoid
cartridge (2).
6. Remove solenoid cartridge (2) assembly from valve
body (1) and discard 'O' rings (11, 12, 14 & 16) and
backup rings (13, 15 & 17).
7. Mark valve body (1) port identification on pressure
switch (20) and remove from valve body (1).
8. Remove plugs (19) from valve body (1) and discard
'O' rings.
9. If required, note orientation and remove hydraulic
line connectors from ports in valve body (1).
ASSEMBLY
Numbers in parentheses refer to Fig. 1.
1. Install new 'O' rings (11, 12, 14 & 16) and backup
Fig. 3 - Emergency Brake Switch Deactivated - Solenoid Cartridge Energized
TO PARKING BRAKE
FROM DIRECTIONAL
CONTROL VALVE
TO PORT 'P1' TREADLE VALVE
TO BRAKE ACCUMULATOR
TO BRAKE ACCUMULATOR
TO PORT 'P2'
TREADLE VALVE
2 - Brake Manifold Valve
TO DIAGNOSTIC
PRESSURE CHECK POINT
3 - Parking Brake Pressure Switch
FROM PRIORITY UNLOADER
VALVE/TO PILOT SUPPLY VALVE
(BODY HOIST SYSTEM)