Lull 944E-42 Service Manual - Manual (Page 179)

9-21 944E-42
Electrical System
9.11 SWITCHES AND SOLENOIDS
9.11.1 Ignition Key Switch
The ignition switch is located on the lower right side of the
dash.
a. Ignition 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 system fluids to
cool.
4. Properly disconnect the batteries.
5. Remove the lower dash cover.
6. Remove the hex nut securing the ignition key switch
to the dash.
7. Label and disconnect the ignition switch connectors
and remove the switch from the machine.
b. Disassembly
DO NOT disassemble the ignition switch. Replace a
defective switch with a new part.
c. Inspection and Replacement
To determine the proper operation of the ignition key
switch, test the terminals on the back of the switch for
continuity with an ohmmeter.
Test the ignition key switch for continuity, by checking
from the terminal “BAT” (Red/Tan) wire to each of the
other terminals in each switch position. Continuity (X)
should be present as indicated in the following table:
If all terminals do not show proper continuity, replace the
ignition switch.
d. Ignition Switch Installation
1. Connect the ignition key switch to the previously
labeled connectors.
2. The ignition switch has a drain hole located on the
shaft, between the backing nut and the face of the
ignition switch cylinder, behind the dash panel. Align
the ignition switch so that when it is in the OFF
position, the key slot is positioned vertically (straight up
and down) and the indicator mark for the drain hole,
is pointing down. Install the nut securing the ignition
switch to the dash. DO NOT overtighten.
3. Install the lower dash panel.
4. Properly connect the batteries.
5. Close and secure the engine cover.
Note: If further information is needed, refer to Section
9.5, “Electrical Schematics.”
9.11.2 Hydraulic Oil Filter Pressure Switch
The hydraulic oil filter pressure switch (5) is threaded into
the top of the hydraulic oil filter, at the top front of the
hydraulic oil reservoir.
a. 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.
Switch Position
Test from “BAT”
(Red/Tan wire) to: OFF RUN START
“IGN” (Tan wire) X
“IGN” (Tan wire) &
“ST” (Red/White wire)
X
MU7350
5