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Table 4-2. Unit Troubleshooting-continued -706880225
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TM-5-4210-233-14-P-1 Firfighting Truck 100 Ft. Aerial Ladder 1000 GPM Manual
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Table 4-2. Unit Troubleshooting-continued -706880227
TM 5-4210-233-14&P-1
Table 4-2.
Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM-CAB CONTROLS AND INDICATORS-Continued
40
ENGINE HOUR METER DOES NOT OPERATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 2 of 16.)
Step 1. Check gauge.
Replace gauge (see para 4-93).
Step 2. Check engine hour PSI switch for proper operation.
Replace PSI switch (see para 4-9.4).
Step 3. Check for +12V at ignition accessory buss for +12V.
Refer to "+12 volts not present at ignition accessory buss" troubleshooting procedure.
Step 4. Check for +12V at circuit breaker #1 on ignition accessory buss.
Replace breaker (see para 4-99).
Step 5. Check wiring for continuity.
Replace wire (see para 4-9.4).
41
AERIAL HOUR METER DOES NOT OPERATE WITH AERIAL MASTER ON,
PARK BRAKE ON, AND SHIFT SELECTOR IN NEUTRAL
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 2 of 16.)
Step 1. Check gauge.
Replace gauge (see para 4-93).
Step 2. Check PTO fuse.
Replace fuse (see para 4-9.4).
Step 3. Check aerial solenoid for proper operation.
Replace solenoid (see para 4-9.4).
Step 4. Check neutral safety relay (CRY032 in DDEC hi-idle interlock module) for +12V at wi e 11 17.
r
Refer to "neutral safety circuit does not provide +12V signal to CRY030" troubleshooting
procedure.
4-97

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