8.11
3507, 3508, 3509, 3512, 3513, 4007, 4008, 4009, 4012, 4013
Hydraulic System
8.8
VALVES AND MANIFOLDS
8.8.1
Main Control Valve
The main control valve is mounted on the side rail in the
engine compartment.
The main control valve assembly consists of working
sections with their own valve assemblies, each providing
a specific hydraulic function. Those functions are:
lift/lower (
1
), extend/retract (
2
), tilt (
3
), auxiliary (
4
),
sway (
5
), outrigger right (
6
) and outrigger left (
7
).
Note:
The 7M Agricultural Option has two separate
options for the main control valve. The functions are:
lift/lower (
8
), extend/retract (
9
), tilt (
10
), auxiliary (
11
),
sway (
12
) and auxiliary rear (
13
).
a. Main Control Valve Removal
1. Park the machine on a firm, level surface, level the
machine, fully retract the boom, lower the boom,
place the transmission control lever 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. With the engine OFF, relieve any trapped pressure in
the hydraulic system by using the lever (supplied in
the tool box) or a 9mm wrench and move the double
nut on the side of the actuator module on each valve
section back and forth.
5. Thoroughly clean the main control valve and
surrounding area, including all hoses and fittings,
before proceeding.
6. Place a suitable container to catch hydraulic fluid
drainage beneath the frame.
7. Label, disconnect and cap all the hydraulic hoses,
tubes and wires at the main control valve.
8. Wipe up any hydraulic fluid spillage in, on, near and
around the machine and the work area.
MZ1480
4
3
2
1
4
3
2
5
4
3
2
1
5
7
4
3
2
1
5
6
7
4 SECTION VALVE
5 SECTION VALVE
6 SECTION VALVE
7 SECTION VALVE
1
MZ1770
11
10
9
13
11
10
9
8
12
13
5 SECTION VALVE
6 SECTION VALVE
8
