TUBE 3111675 - Caterpillar

FRONT GEAR TRAINCamshaft
This engine uses a single forged camshaft that is driven at the front. It is supported by four bearings. The front journal is supported by two bearings. This extra support at the front is necessary because the camshaft gear drives the hydraulic pump gear. The camshaft has eight cam lobes. It is held in position by a thrust bearing plate that goes into a groove in the camshaft and is fastened to the front face of the cylinder block.Each lobe on the camshaft moves a valve lifter, which in turn moves a push rod, rocker arm and a valve (either intake or exhaust).Pistons and Rings
The cast aluminum piston has two rings; one compression ring and one oil ring. The rings are located above the piston pin bore. The compression ring is a standard (conventional) type.The oil ring is a standard (conventional) type and is spring loaded. Holes in the oil ring groove provide for the return of oil to the crankcase.The piston has a special shape (cardioid design) of the top surface to help combustion efficiency. This piston also has a tapered pin bearing design. This provides a larger surface area at the top of the pin bearing to take the load of the power stroke more evenly.The piston pin is retained by two snap rings which fit in grooves in the pin bore.Connecting Rods
The connecting rod eye end has the tapered design with the larger bearing surface at the bottom of the eye. This provides more surface area for the increased load of the power stroke.Electrical System
The electrical system has three separate circuits: the charging circuit, the starting circuit and the lighting circuit. Some of the electrical system components are used in more than one circuit. The battery (batteries), disconnect switch, circuit breaker, ammeter, cables and wires from the battery are all common in each of the circuits.The charging circuit is in operation when the engine is running. An alternator makes electricity for the charging circuit. A voltage regulator in the circuit controls the electrical output to keep the battery at full charge.
The disconnect switch, if so equipped, must be in the ON position to let the electrical system function. There will be damage to some of the charging circuit components if the engine is running with the disconnect switch in the OFF position.
If a disconnect switch is used, the starting circuit can operate only after the disconnect switch is put in the ON position.The starting circuit is in operation only when the start switch is activated.The low amperage circuit and the charging circuit are both connected through the ammeter. The starting circuit is not connected through the ammeter.Charging System Components
Alternator (Delco-Remy)
The alternator is an electrical and mechanical component driven by a belt from engine rotation. It is used to charge the storage battery during the engine operation. The alternator is cooled by fan (5) that is part of the alternator.A solid state regulator is installed inside the back frame of the alternator. Two brushes