Service Brake Valve - JLG sky trak mmv Service Manual

Hydraulic System
9.12.7

Service Brake Valve

The service brake valve (1) is secured with two cap-
screws and lockwashers at the base of the steering col-
umn support (2), 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, Wheels and Tires, for further information.
1
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 [N] NEUTRAL,
place the neutral lock lever in the [N] NEUTRAL
LOCK 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 .
9.120
2
WARNING:
cause severe burns. Wait for hydraulic fluid to
cool before servicing any hydraulic component.
3. Unlatch and open the engine cover. Allow the
hydraulic fluid to cool.
WARNING:
under pressure can penetrate the skin, causing
death or serious injury. Relieve hydraulic pres-
sure before servicing any hydraulic component.
4. To remove the service brake valve, both the lower
dash panel and the front dash panel must be
removed. Refer to Section 3.2.3, Cab Maintenance.
5. Pump the brake pedal several times to relieve all the
stored pressure in the accumulator system.
6. Label or otherwise mark the hydraulic hoses on the
top (3), bottom (4) and side (5) of the service brake
valve (6). Disconnect and cap all hoses, fittings, wire
terminal leads, etc.
MM4600
6
Hot hydraulic fluid can
Escaping hydraulic fluid
5
3
4
Model MMV Rev. 12/04
MM4620