SOLENOID VALVES (36Z341)
It is not necessary to remove the solenoid valves to
replace a defactive solenoid. If only a solenoid is to
hydraulic outrigger control valves are located in two banks
be replaced. proceed as described in step 2 of disas-
of four valves each beneath the rear deck covers of the
These valves are four-way valves of the sliding spool type.
In either shifted position, the pressure port is connectad to
1. Mark all electrical wiring and hydraulic hose connections
one cylinder port, while the opposite cylinder port is open
before they are removed.
to tank. When the spool is in the neutral position, the oil
2. Disconnect all electric wiring from the solenoids.
passes through the remaining valve in the bank and then
back to tank.
3. Disconnect the hydraulic hoses and cap each hose so dirt
will not enter the system.
Each valve consists primarily of a body, a sliding spool, and
solenoids which are used to position the spool. The spool is
4. Unbolt the assembly from the carrier frame and remove
precision fitted into the bore in the valve body. The lands
the entire solenoid valve assembly.
of the spool divide this bore into a series of separate
chambers. Ports in the valve body lead into these chambers
so that the position of the spool determines which of the
DISASSEMBLY. Disassemble the solenoid valves as follows
ports are open to each other and which am sealed off. Ports
(see Figure 74):
which are sealed off from each other in one position may
be interconnected in another position.
1. Remove the nuts from the four studs which hold the
valve assembly together.
The spool is spring Ioaded at each end. The springs return
the spool to the center position when both solenoids are
de-energized The valve can be operated manually by de-
pressing the small pushbuttons in each end of the valve.
Each valve is separated by a seal plate which serves
If one of the solenoid operated valves should fail to func-
the purpose of retaining the connecting port O-rings.
tion properly, the solenoids may be tested by removing the
When removeing valves, note their position in the
suspected valve from the valve body for bench testing.
bank, since they must be reassembled in the same
The solenoids are energized by a two wire, 12 volt DC
2. Remove the solenoids by removing the four holding
screws, and pull the solenoid from the valve body.
REMOVAL. To remove the solenoid valves, proceed as
3. The centering springs and spring seats may now be
Figure 7-4. Solenoid Operated Valve (36Z341)