JLG 4017PS Service Manual - Manual (Page 197)

9-39 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Electrical System
9.12.8 Back-up Alarm
The back-up alarm is located at the rear of the machine.
When the transmission shift control switch (transmission
control lever) is shifted to the (R) REVERSE position, the
back-up alarm will automatically sound.
Place the transmission control lever in (R) REVERSE to
test the back-up alarm. The back-up alarm must not
sound when the transmission control lever is in
(N) NEUTRAL or (F) FORWARD. Also, with the ignition
key switch in the RUN position, the back-up alarm will
sound when the transmission control lever is shifted into
the (R) REVERSE position.
a. Disassembly
DO NOT disassemble the back-up alarm. Replace a
defective or faulty alarm with a new part.
9.13 DASH SWITCHES
Note: For information on the front windshield wiper, rear
window wiper and washer systems, refer to Section 9.11,
“Window Wiper/Washer Windshield Wiper Motor.”
9.13.1 Ignition Key Switch
a. Ignition Key Switch 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 engine to cool.
4. Properly disconnect the battery
5. Remove the screws securing the lower dash panel.
6. Remove the hex nut securing the ignition key switch
to the dash.
7. Lower the dash panel to gain access to the rear of
the ignition switch. Push the switch through the
panel.
8. Label and disconnect the electrical connections
attached to the switch.
9. Remove the switch from the machine.
b. Disassembly
DO NOT disassemble the ignition key switch. Replace a
defective switch with a new part.
c. Inspection and Replacement
To determine the proper operation of the ignition key
switch, using the following chart, test the wires on the
back of the switch for continuity with an ohmmeter.
Test the ignition key switch for continuity, by checking
from the power (#30) wire to each of the following wires
in each switch position. Continuity should be present as
indicated in the following chart:
If all connections do not show proper continuity, replace
the ignition switch.
d. Ignition Key Switch Installation
1. Connect the previously labeled electrical
connections to the ignition key switch.
2. Push the ignition key switch through the hole in the
dash.
3. Secure the switch to the dash with the previously
used hex nut.
4. Verify that each ignition position is properly
connected.
Switch Position Test for Continuity Between
Wire #30 and wires:
P #58
I #15
II #15 & #19
III #15, #17 & #50
0
P I
II
III
MZ2130
MZ2140