JLG 450A_AJ Series II Service Manual - Manual (Page 121)

SECTION 3 - CHASSIS & TURNTABLE
3121290 – JLG Lift – 3-81
Change Engine Oil
ALWAYS CHANGE OIL FILTER WHEN CHANGING OIL. CHANGE OIL WHEN
ENGINE IS WARM FROM OPERATION AS OILS WILL FLOW FREELY AND CARRY
AWAY MORE IMPURITIES.
To change oil:
1. Start engine and run until it reaches normal operating
temperature.
2. Stop engine.
3. Remove drain plug and allow oil to drain.
4. Remove and discard oil filter and its sealing ring.
5. Coat sealing ring on filter with clean engine oil and wipe
sealing surface on filter mounting surface to remove
dust, dirt and debris. Tighten filter securely (follow filter
manufacturers instructions). Do not over tighten.
6. Check sealing ring on drain plug for damage, replace if
necessary, wipe plug with a clean rag, and wipe sealing
surface on pan and reinstall pan plug. Do not over
tighten.
7. Fill crankcase with oil.
8. Start engine and check for oil leaks.
9. Stop engine and check oil level is at “FULL”.
10. Properly dispose of oil and filter.
Coolant Fill Procedure - Dual Fuel Engine
DAMAGE TO ENGINE COULD OCCUR IF NOT PROPERLY FILLED WITH COOLANT.
LPG FUELED ENGINES ARE MOST PRONE TO CREATING AN AIR LOCK DURING A
COOLANT FILL OPERATION DUE TO THE ELECTRONIC PRESSURE REGULATOR
(EPR) BEING THE HIGHEST POINT IN THE COOLING SYSTEM. AN EPR THAT
APPEARS TO HAVE FROST FORMING ON IT IS A SIGN THE ENGINE COOLING
SYSTEM CONTAINS AIR. APPEARANCE AND TEMPERATURE OF THE EPR
SHOULD BE MONITORED DURING COOLANT FILL OPERATION. A WARM EPR IS
AN INDICATION THAT THE COOLING SYSTEM IS PROPERLY FILLED AND FUNC-
TIONING.
MAKE SURE ENGINE IS COOL BEFORE PERFORMING ANY
MAINTENANCE WORK.
1. Loosen worm gear clamp on coolant line to EPR as
shown below and remove hose from EPR. Place a rag
under hose to prevent coolant from running onto
engine/machine.
2. Remove radiator cap. Fill radiator with coolant until
coolant starts to appear from previously removed hose
at EPR. Reinstall hose to EPR and continue to fill radiator
with coolant.
3. With radiator cap still removed, start engine and run
until thermostat opens. Thermostat opens at 170° F (77°
C), which can be checked using the JLG handheld ana-
lyzer.
WHILE ENGINE IS RUNNING, AIR AND/OR STEAM MAY BE PRESENT COMING
FROM RADIATOR. THIS IS NORMAL.
4. Run engine for 5 minutes after it reaches operating tem-
perature. Shut engine off and continue to step 5.