JLG 4017RS Service Manual - Manual (Page 176)

Electrical System
9-24 3614RS, 4017RS
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.
5. Install the lower dash panel.
6. Properly connect the battery.
7. Close and secure the engine cover.
8. Start engine to verify proper operation of the ignition
switch.
9. Remove the Do Not Operate Tag from the ignition key
switch and the steering wheel.
9.9.2 Dash Switches
a. Switch 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.
5. Pull the frame out of the dash, disconnect the harness
connector to the switch in question and push the switch
out of the frame.
b. Disassembly
DO NOT disassemble the dash switch. Replace a defective
switch with a new part.
c. Inspection and Replacement
Inspect the switch terminals for continuity and shorting in
both the engaged and disengaged positions. Replace a
defective or faulty switch with a new switch.
d. Switch Installation
1. Connect the switch to the cab harness connector.
2. Position the switch over the rectangular switch bezel
and snap into position.
3. Properly connect the battery
4. Start the machine and check the replaced switch for
proper function.
5. Close and secure the engine cover.
6. Remove the Do Not Operate Tag from the ignition key
switch and the steering wheel.
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