Hydraulic Section
8-43
6036, 6042, 8042, 10042, 10054 31211015
8.8.2 Service Brake Valve
a. Service Brake Valve Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom, place
the transmission in (N) NEUTRAL, engage the park brake
and shut the engine OFF.
2. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the machine
should not be operated.
3. Open the engine cover. Allow the system fluids to cool.
4. Properly disconnect the battery. Refer Section 9.8,
“Battery”, for procedure.
5. Remove the lower and front dash panels.
Prior to SN 0160074878, excluding 0160074813
0160074818 and 0160074882
SN 0160074878 to Present, including 0160074813
0160074818 and 0160074882
6. Label, disconnect and cap all hose attached to the
service brake valve (1).
7. Remove the four capscrews and four lockwashers
mounting the service brake valve to the steering
column support.
Note: DO NOT disassemble the service brake valve. The service
brake valve is not serviceable and must be replaced in its
entirety, if defective.
8.8.3 Service Brake Valve Installation
1. Install the service brake valve with the four capscrews
and four lockwashers onto the steering column
support.
Note: ALWAYS replace seals, o-rings, gaskets, etc., with new
parts to help ensure proper sealing and operation. Lubricate
seals and o-rings with clean hydraulic oil.
2. Use new oiled o-rings as required. Uncap and connect
the previously labeled hoses to the service brake valve.
3. Check the routing of all hoses, and tubing for sharp
bends or interference with any rotating members, and
install tie wraps and/or protective conduit as required.
Tighten all tube and hose clamps.
4. Properly connect the battery. Refer Section 9.8,
“Battery”, for procedure.
5. Remove the Do Not Operate Tags from both the ignition
key switch and the steering wheel.
6. Start the engine and run at approximately one-third to
one-half throttle for about one minute, without moving
the machine or operating any of the hydraulic functions.
7. Inspect the service brake valve and connections for
leaks, and check the level of the hydraulic fluid in the
reservoir. Shut the engine OFF.
To Next Page
