JLG 450A_AJ Series II Service Manual - Manual (Page 197)

SECTION 3 - CHASSIS & TURNTABLE
3121180 – JLG Lift – 3-147
3.21 PERKINS ENGINE GENERAL
MAINTENANCE
Replacing the Engine Crankcase Breather
KEEP PARTS CLEAN FROM CONTAMINANTS. CONTAMINANTS
MAY CAUSE RAPID WEAR AND SHORTENED COMPONENT LIFE.
1.Loosen screws (1) and remove breather cover (2) from
valve mechanism cover.
2. Remove spring (3). Remove diaphragm and plate (4).
3. Clean vent hole (6) and cavity (5) in valve mecha-
nism cover.
MAKE SURE THAT THE COMPONENTS OF THE BREATHER
ASSEMBLY ARE INSTALLED CORRECTLY. ENGINE DAMAGE MAY
OCCUR IF THE BREATHER ASSEMBLY IS NOT WORKING COR-
RECTLY.
4. Install new diaphragm and plate (4) for breather
assembly into cavity (5) of valve mechanism cover.
5. Install new spring (3).
6. Install breather cover (2) and four screws (1).
Tighten screws.
Engine Oil Level - Check
HOT OIL AND COMPONENTS CAN CAUSE SEVERE BURNS. DO
NOT ALLOW HOT OIL OR COMPONENTS TO CONTACT SKIN.
NOTE: Perform this maintenance with engine stopped.
1.Maintain oil level between “ADD” mark (Y) and “FULL”
mark (X) on oil level gauge (1). Do not fill crankcase
above “FULL” mark (X).
NOTE: Operating your engine when oil level is above “FULL”
mark could cause your crankshaft to dip into the oil.
Air bubbles created from crankshaft dipping into the
oil reduces the oil's lubricating characteristics and
could result in loss of power.
2. Remove oil filler cap and add oil, if necessary. Clean
oil filler cap and reinstall.
Engine Oil and Filter - Change
HOT OIL AND COMPONENTS CAN CAUSE SEVERE BURNS. DO
NOT ALLOW HOT OIL OR COMPONENTS TO CONTACT SKIN.
CARE MUST BE TAKEN TO ENSURE FLUIDS ARE CONTAINED
DURING PERFORMANCE OF INSPECTION, MAINTENANCE, TEST-
ING, ADJUSTING, AND REPAIR OF THE PRODUCT. BE PREPARED
TO COLLECT THE FLUID WITH SUITABLE CONTAINERS BEFORE
OPENING ANY COMPARTMENT OR DISASSEMBLING ANY COM-
PONENT CONTAINING FLUIDS. DISPOSE ALL FLUIDS ACCORD-
ING TO LOCAL REGULATIONS AND MANDATES.
KEEP ALL PARTS CLEAN OF CONTAMINANTS. CONTAMINANTS
MAY CAUSE RAPID WEAR AND SHORTENED COMPONENT LIFE.
1. Screws for the breather cover
2. Breather cover
3. Spring
4. Diaphragm and plate
5. Cavity
6. Vent hole
Figure 3-94. Crankcase Breather - Perkins