Table 4-2. Unit Troubleshooting-continued -706880189

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

Table 4-2 Unit Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM - Continued

AERIAL CONTROLS WILL NOT OPERATE - Continued

Step 7. Check for malfunction of diverter valve.

Replace diverter valve (see para 4-193).

LADDER RAISES AND EXTENDS SLOWLY OR ERRATICALLY

Step 1 hydraulic oil level.

Refill hydraulic oil to proper level.

Step 2. Check position of HIGH IDLE switch.

Engage HIGH IDLE switch (1250 RPM min. )

Step 3. Check for sufficient lubrication on ladder slides and water pipes.

Lubricate ladder slides and water pipes (see Chapter 3, Lubrication Instructions).

Step 4. Check for leaking cylinder piston seals.

Notify Direct Support.

ALL LADDER OPERATIONS ERRATIC OR SLOW

Step 1. Check engine RPM.

Increase to proper RPM (1250 RPM).

Step 2. Check SYSTEM PRESSURE at gauge on aerial control platform.

Ensure SYSTEM PRESSURE is 2100-2150 PSI, if pressure is not within limits, refer to Direct

Support maintenance level to test pressure red cing (de-stroking) valve for proper operation.

Step 3. Check for restriction in hydraulic tank return hose or filter.

Replace hydraulic filter (see para 4-189).

Replace return hose (see para 4-9).

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