Table 4-2. Unit Troubleshooting-continued -706880253

TM 5-4210-233-14&P-1

Table 4-2. Unit Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

ELECTRICAL SYSTEM - PUMP PANEL - Continued

AERIAL POSITION OF DIVERTER CONTROL VALVE DOES NOT FUNCTION WITH

OUTRIGGERS PROPERLY DEPLOYED

(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 9 of 16.)

Step 1. Check that diverter valve manual override engages aerial hydraulics.

Refer to hydraulic troubleshooting.

Step 2. Check that diverter valve manual override lever is disengaged. Control lever should move

freely and T-handle should be in the horizontal position.

If lever does not move freely, unlock lever by turning T-handle to the horizontal position

and try aerial position of diverter valve switch again.

If lever moves freely, go to Step 3.

Step 3. If aerial ladder is raised, check aerial nested switch for proper operation.

Replace switch (see para 4-9.4).

Step 4. If aerial ladder is nested, check left and right outrigger interlock relays for continuity between

wires 1224 and 1247 (left) and wires 1247 and 1242 (right).

Replace relay (see para 4-9.4).

Step 5. Check aerial solenoid for proper operation.

Replace aerial solenoid (see para 4-9.4).

Step 6. Check diverter switch for proper operation.

Replace switch (see para 4-179).

Step 7. Check wiring for continuity.

Replace wire (see para 4-9.4).

Step 8. Check for +12V at aerial circuit breaker #2.

Replace breaker (see para 4-99.)

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