JLG 4017 Service Manual - Manual (Page 141)

9.21 4017
Electrical System
9.11.2 Main Control Valve Solenoids
a. Main Control Valve Solenoid Removal
1. Open engine cover. Allow engine to cool.
1. Clean area around valve solenoid to be removed.
2. Disconnect the negative (-) battery cable at the
negative (-) battery terminal.
3. Disconnect the wiring connector at the valve
solenoid lead
4. Loosen and remove the four allenhead mounting
screws.
5. Remove the valve solenoid (2) being careful not to
lose or damage any o-rings. Note the location of any
orifices, check valves and o-rings if equipped.
b. Main Control Valve Solenoid Disassembly
DO NOT disassemble a valve solenoid. Replace a
defective valve solenoid with a new solenoid.
c. Main Control Valve Solenoid Installation
1. Install the valve solenoid using new o-rings and
tighten the allenhead screws. Do Not Over Tighten.
2. Connect the wire connector to the valve solenoid
3. Start the machine and slowly move joystick to
engage function. If further trouble shooting is
required, refer to Section 9.5, “Electrical System
Schematics,” or Section 8.4.2, “Hydraulic
Schematic.”
4. Close and secure engine cover.
9.11.3 Transmission Solenoid Valves
The transmission should be checked, serviced and
repaired only by experienced service technicians who are
aware of all safety instructions and particular component
features.
Note: If the transmission is not shifting properly, the
transmission control lever, wiring harness or
transmission shift solenoids (3) should be checked in
order to determine which component is defective.
Specific information to determine which travel position
and corresponding component is not responding can be
found in the detailed transmission service instructions
(covering repair, disassembly, reassembly and
adjustment information) are provided in the Dana-Spicer
T12000 Transmission Repair Manual, PN-0120 and can
be obtained by calling your local Dana Spicer Service
Center.
Note: Contact the JLG Service Department if internal
transmission repair is required during the warranty
period.
MZ0450
2
MZ0650
3
4