Table 4-2 UNIT TROUBLESHOOTING - Continued
TEST OR INSPECTION
APU ENGINE LOW POWER
Drain tank, change filter and refill with correct fuel.
Check air cleaner.
Replace filter and clean housing, (see para. 4-15).
Check fuel filter and hoses.
Replace filter if dirty. Replace hoses if blocked or kinked.
Check throttle linkage.
Repair/replace faulty part.
Check engine adjustments.
Adjust and if necessary, overhaul engine, (see para. 4-15).
COMPARTMENT DOOR WILL NOT LATCH
Check latch and handle.
Replace failed component.
Check hatch holder.
Replace as required.
PUMP WILL NOT ENGAGE
Check correct sequence of switching has been carried out
Use proper switching sequence.
Check manual shutdown valve is closed.
Close manual shutdown valve.
Check PTO solenoid clicks when pump switch operated.
If no click, check electrical connections and solenoid. Replace solenoid or wire/connections as