Parking Brake Valve Repair
1800 SRM 951
CLEAN AND INSPECT
WARNING
Cleaning solvents are flammable and toxic and
can cause skin irritation. When using clean-
ing solvents, always follow the solvent manu-
facturer’s recommended safety precautions.
Clean parts in solvent. Inspect spool and bores for
scratches. If there are scratches or other damage,
parts must be replaced. Lubricate parts with clean
hydraulic oil for assembly.
ASSEMBLE AND INSTALL
1.
Install valve assembly using bolts that fasten
valve assembly to floor plate of cab.
2.
Install lines to brake treadle valve.
3.
Operate system and check valve connections for
leaks. Remove air from hydraulic system as de-
scribed in System Air Removal.
Parking Brake Valve Repair
REMOVE
WARNING
Before disconnecting any hydraulic lines,
release pressure from hydraulic circuit as fol-
lows:
1.
Shut engine OFF and completely lower
mast. Install blocks at wheels to prevent
vehicle from moving.
2.
Operate brake pedal until hydraulic pres-
sure is released.
1.
Put blocks in front and back of tires so the vehicle
cannot move.
2.
Disconnect electrical connector.
Put tags for
identification on hydraulic lines.
3.
Disconnect lines from parking brake valve. See
Figure 2. Put caps on open lines. Remove valve.
CLEAN AND INSPECT
WARNING
Cleaning solvents are flammable and toxic and
can cause skin irritation. When using clean-
ing solvents, always follow the solvent manu-
facturer’s recommended safety precautions.
Clean parts in solvent. Inspect parts and bores for
scratches. Replace valve if there are scratches or
other damage. Lubricate parts with clean hydraulic
oil for assembly.
REPAIR
Install new O-rings at each port.
INSTALL
1.
Install parking brake valve. Connect lines.
2.
Operate system and check for leaks and correct
operation of parking brake system. Remove air
from brake system as described in System Air
Removal.
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