JLG 450A_AJ Series II Service Manual - Manual (Page 156)

SECTION 3 - CHASSIS & TURNTABLE
3-106 – JLG Lift – 3121180
CRANKSHAFT POSITION (CKP) SENSOR
The crankshaft position (CKP) sensor provides a signal used
by the Engine Control Module (ECM) to calculate the ignition
sequence. The sensor initiates reference pulses which the
ECM uses to calculate RPM and crank-shaft position.
ELECTRONIC IGNITION
The electronic ignition system controls fuel combustion by
providing a spark to ignite compressed air/fuel
w mixture at
the correct time. T he ECM controls ignition system spark
advance to provide optimum engine performance, fuel
economy, and control of exhaust emissions.
IGNITION COIL
The electronic ignition system uses a coil pack with one
ignition coil for each two cylinders. Each cylinder is paired
with its opposing cylinder in the firing order. One cylinder
on compression fires simultaneously with the opposing
cylinder on exhaust. A spark that occurs in the cylinder on
exhaust stroke is referred to as a “waste spark.”
Primary coils in the coil pack are triggered by “Ignition Coil
Feed #1” and “Ignition Coil Feed #2” ECM signals.
3.15 DEUTZ ENGINE
NOTE: Refer to engine manufacturer’s manual for detailed
operating and maintenance instructions.
Checking Oil Level
1. Make sure machine and engine are level and switch
engine OFF before checking oil level.
2. Remove oil dipstick and wipe with clean cloth.
3. Insert dipstick to the stop and remove again.
4. Check oil level. Top oil level to MAX mark with an
approved grade and type of oil outlined in engine
manufacturer’s operator’s manual.
5. Replace dipstick until fully seated.
Changing Engine Oil
1. Allow engine to warm up. Engine oil should reach
approximately 176° F (80° C).
2. Make sure machine and engine are level and switch
off engine.
3. Place oil tray under engine.
HOT ENGINE OIL CAN CAUSE BURNS. AVOID CONTACT WITH HOT
OIL WHEN DRAINING.
COLLECT USED OIL IN A CONTAINER SUITABLE FOR DISPOSAL
OR RECYCLING. DISPOSE OF USED ENGINE OIL IN ACCORDANCE
WITH ENVIRONMENTAL REGULATIONS.
4. Open oil drain valve and drain oil.
5. Close oil drain valve.
6. Pour in new engine oil. Refer to Section 1 for capac-
ity and refer to Figure 3-63., Engine Oil Viscosity.
Figure 3-63. Engine Oil Viscosity