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TM 5-4210-233-14&P-1
Table 4-2 Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM - Continued
3
AERIAL CONTROLS WILL NOT OPERATE - Continued
Step 7. Check for malfunction of diverter valve.
Replace diverter valve (see para 4-193).
4
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.
5
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 reducing (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).
4-60
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