4-15. AUXILIARY POWER UNIT - Continued
Clamp inlet and outlet water hoses with hose crimp retaining pliers.
Loosen hose clamps and pull hoses of water pump barbed fittings.
Loosen set screws (1).
Remove two capscrews (2), washers (3) and locknuts (4) Discard locknuts.
Withdraw water pump from pump support bracket and separate the drive couplings.
Remove fittings from pump suction and discharge.
Remove pump drive coupling.
Install pump drive coupling on end of pump shaft.
Install fittings on pump suction and discharge.
Install two capscrews (2), washers (3) and locknuts (4) and tighten to 8 ft lb (11 Nm).
Install set screws (1) to lock pump drive coupling.
Push water hoses onto pump and tighten hose clamps.
Remove hose crimp retaining pliers from inlet and outlet hoses.
Start APU and run for 15 minutes checking for fuel and water leaks. This will also remove all air out of
the Winterization System.
Check level of coolant in main engine radiator and top up as required.