2-11. OPERATING PROCEDURES-Continued.
Shift SYSTEM SELECTOR control lever (1) to MAIN. Shift POWER control lever (2) to ON. Place
rest of hydraulic control levers in N. Check APU emergency winch control valve (3) for NORMAL
Hydraulic operation above 170°F (77oC) not recommended. High oil temperature
may cause abnormal system performance.
Speed up engine to 1000 rpm and wait 5 to 10 minutes to let oil circulate and warm up.
For cold weather operation-increase engine to 1800 rpm. Be sure spade is locked
and move SPADE operating lever (4) to RAISE for 3 to 4 minutes. This will cause
oil to spill over relief valve for faster warm up.
Return engine to low idle. Ensure MAIN WINCH and HOIST WINCH SHIFT levers are in NEUTRAL
(see para. 2-1b). With systems in a no-load condition, circulate oil through main and hoist winch
systems. Move HOIST WINCH operating lever (5) to RAISE and LOWER. Move MAIN WINCH
operating lever (6) to INHAUL and PAYOUT. Do this 3 or 4 times.
Slowly increase engine speed to 1800 rpm by using hand throttle.
The hydraulic system is now ready for operation or draining.