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Table 4-2. Unit Troubleshooting-continued -706880238
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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 -706880240
TM 5-4210-233-14&P-1
Table 4-2. Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM - HI-IDLE CIRCUITS - Continued
1
HIGH IDLE SWITCH IN CAB WILL NOT ENGAGE HIGH IDLE - Continued
Step 6. Check for +12V at terminal #9 of CRY032.
Replace pump linkage switch (see para 4-9.4).
Step 7. Check for +12V at terminal #6 of CRY032.
Replace CRY032 (see para 4-9.4).
Step 8. With PTO switch off, check for continuity between terminals 6, 9 and 7, 4 on CRY054.
Replace CRY054 (see para 4-9.4).
Step 9. Attempt to engage high idle using cab switch, then, with wires 1494 and 1495 disconnected,
check for continuity between terminals 4 and 7 of CRY031.
Replace CRY031 (see para 4-9.4).
2
HIGH IDLE ENGAGES, BUT INDICATOR LIGHT DOES NOT ILLUMINATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 3 of 16.)
Step 1. Check bulb.
Replace bulb (see para 4-95).
Step 2. Check terminal #9 on CRY031 (wire 1427) for +12V.
Replace wiring/circuit breaker #2 on ignition accessory buss (see para 4-99).
Step 3. With high idle engaged, check for +12V on terminal #6 of CRY031 (wire 1510).
Replace CRY031 (see para 4-9.4).
4-110

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