+40F to 0F to
A - Annually
APU CRANKCASE. Semiannually change oil and clean filter. Replace filter if damaged. Remove drain plug and
oil filter elements. Clean filter using cleaning solvent (P-D-680, Type III). Lube filter and new gasket with oil (OE), and
install with drain plug. Remove oil filter cap and add 1.37 qt (1.3 1) of oil (OE). Check oil level on dipstick.
HYDRAULIC TANK. Semiannually change oil and clean filter. Replace filter if damaged. To drain, close oil tank
valve and remove drain plug from hydraulic tank. Check (magnetic) drain plug for metal particles and, if particles are
found, wipe clean with clean rag. Remove tank inlet, attaching hardware, gasket, and hydraulic tank filter. Clean filter
using cleaning solvent (P-D-680, Type III). Lube filter and new gasket with clean oil (HO). Install filter, gasket, tank inlet,
and attaching hardware. Refill using hydraulic fluid (HO) as required and open oil valve.
FUEL FILTER. Semiannually remove and replace fuel filter. To remove, turn fuel petcock to closed position.
Unscrew fuel filter housing ring and remove glass bowl and fuel filter. To replace filter, put filter on filter block, fill glass
bowl half with diesel fuel (DF) as required, and install on filter block. Secure glass bowl to block by installing filter housing
ring. Turn fuel petcock to open position to vent.
THROTTLE CABLE. Semiannually clean throttle cable and relubricate. Remove wire end from APU manual
control. Clean any dirt or oil buildup from cable using rags. Spray end of cable and into cable housing with silicone
lubricant. Direct spray into cable housing and allow fluid to run down into housing. Operate throttle control several times
to ensure cable operates freely. Reconnect wire end of throttle control back to APU manual control.