JLG 450A_AJ Series II Service Manual - Manual (Page 171)

SECTION 3 - CHASSIS & TURNTABLE
3121180 – JLG Lift – 3-121
Changing 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 operat-
ing 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 MAIN-
TENANCE WORK.
1. Loosen worm gear clamp on coolant line running
into 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 hand-
held analyzer.
WHILE ENGINE IS RUNNING, AIR AND/OR STEAM MAY BE PRES-
ENT COMING FROM RADIATOR. THIS IS NORMAL.
4. Run engine for 5 minutes after it reaches operating
temperature. Shut engine off and continue to step 5.