Lull 944E-42 Service Manual - Manual (Page 450)

Hydraulic System
8.198 Model 644E-42/944E-42 Rev. 6/04
8.12.10 Service Brake Valve
The service brake valve is secured at the base of the
steering column support inside the dash, concealed by
the lower dash cover.
The service brakes themselves are part of the axles (the
park brake is part of the front axle only). Refer to Section
5, “Axles, Drive Shafts, Wheels, Tires and Brakes,” for
further information.
a. Service Brake Valve Removal
1. Park the vehicle on a firm, level surface, fully retract
all hydraulic cylinders, ground the attachment (if
any), place the travel select lever in the [N]
NEUTRAL DETENT position, engage the park brake
switch and shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition switch and the steering wheel, stating that
the vehicle should not be operated. Refer to Section
1.5, “Accident Prevention Tag Usage.”
3. Unlatch and open the engine cover. Allow the
hydraulic fluid to cool.
4. To remove the service brake valve, the lower dash
panel must be removed. Refer to Section 4.5, “Cab
Removal.”
5. Pump the brake pedal several times to relieve all the
stored pressure in the accumulator system.
6. Remove the brake valve from the dash. Refer to
Section 4.3.5, “Brake Valve and Service Brake
Pedal,” for the proper removal procedure.
DO NOT disassemble the service brake valve. The
service brake valve is not serviceable and must be
replaced in its entirety if defective, as no replacement
parts are available for internal components.
WARNING:
Hot hydraulic fluid can
cause severe burns. Wait for hydraulic fluid to
cool before servicing any hydraulic component.
WARNING:
Escaping hydraulic fluid
under pressure can penetrate the skin, causing
death or serious injury. Relieve hydraulic
pressure before servicing any hydraulic
component.
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