Table 4-2. Unit Troubleshooting-continued -706880187

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

Table 4-2. Unit Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM

P. T. O. WILL NOT ENGAGE

Step 1. Check that AERIAL MASTER switch is energized.

Engage AERIAL MASTER switch.

Step 2. Check that AERIAL P. T. O. switch is engaged.

Engage AERIAL P. T. O. switch.

Step 3. Check that transmission range selector is in N (neutral).

Engage N (neutral) with range selector.

Step 4. Check that parking brake is engaged.

Engage parking brake.

Step 5. Check engine speed on tachometer.

Ensure engine speed is below 1 000 RPM.

Step 6. Check for malfunctioning high idle interlock system (DDEC).

See electrical troubleshooting procedures. If problem cannot be corrected, refer to Direct

Support maintenance level.

OUTRIGGERS WILL NOT OPERATE

Step 1. Check that P. T. O. is engaged.

Engage P. T. O.

Step 2. Check position of DIVERTER VALVE OUTRIGGERIAERIAL switch.

Select OUTRIGGER position with DIVERTER VALVE OUTRIGGER/AERIAL switch.

Step 3. Check position of manual override.

Ensure maual override is in neutral position and handle moves freely.

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