TM2361 (24JUN08) 9010-05-9 450DLC Excavator Operation and Tests 062608 PN=257 Theory of Operation Engine Lubrication System Operation RIGHT SIDE GALLERY LEFT SIDE GALLERY OIL PRESSURE UNIT CYLINDER HEAD OR SWITCH SUPPLY PUMP TURBOCHARGER OIL FILTER RELIEF OIL PORT VALVE CAM JOURNAL IDLE GEAR OILING JET IDLE GEAR IDLE GEAR AIR CONDITIONING A B C COMPRESSOR (2, 5) ROCKER ARM RELIEF CRANK SHAFT VALVE JOURNAL OIL THERMO CAM ROCKER COOLER VALVE JOURNAL ARM CRANK PIN (1, 3, 4, 6) CONNECTING RELIEF ROD OIL VALVE –19–22DEC05 PUMP TX1001650 STRAINER TX1001650 OIL PAN The engine lubrication system consists of a positive Oil from the main bearing also supplies oil to the displacement gear-driven oil pump, full-flow oil filters, piston cooling orifices.
Oil from the piston cooling water-cooled oil cooler, oil jets and relief valves. The orifices sprays on the underside of the piston to keep oil pump pulls oil from the oil pan sump through a the piston crown cool. The oil spray also provides strainer and a suction line. The pump forces oil splash lubrication for the piston pin and bushing by through the outlet tube into a vertical drilling in the splashing oil into a hole drilled in the top end of the cylinder block, and up to the oil cooler and to the connecting rod. At the rear of the cylinder block, oil remote-mounted filters.
After flowing through the cooler flows from the rear camshaft bushing, up through the and filters, oil flows into the right and left oil galleries cylinder head, and into the rocker arm shaft. Oil flows and some is routed to the turbocharger. through the rocker arm shaft and lubricates each of the rocker arms. Oil drips from the rocker arms to lubricate The right-side oil gallery runs the length of the cylinder the adjusting screws, push rods, and camshaft block and delivers oil to oil passages that feed the followers. At the front of the cylinder block, oil flows cylinder head, cam journal rocker arm shaft, and main from the oil passage into a machined groove in the bearing bushings.
The left-side oil gallery runs the front face of the block. This groove connects with the length of the cylinder block as well as providing oil to upper idler gear shaft to provide oil to the idler gear oil jets, supply pump, air compressor, idle gears, crank bushing. The lower idler gear bushing is splash journal, crank pin, and connecting rod. From the main lubricated. bearings, oil flows to the connecting rod bearings through drilled cross-passages in the crankshaft between the main journals and connecting rod journals. Continued on next page JC89288,000003E –19–30JAN06–1/2 9010 05 9 IDLE GEAR B IDLE GEAR C