0335895 JOHNSON CYLINDER HEAD

The cutter is powered by a Caterpillar 3412 diesel engine that has a power take-off unit mounted on the rear (right side). The power take-off includes an air operated clutch to engage or disengage the cutter. Power is transferred from the power take-off to two U-joint drive shafts by drive belts. Each drive shaft turns a belt drive arrangement which transmits the power to a planetary gear reducer, one reducer at each end of the cutter.
POWER TAKE-OFFWhen the cutter control valve on the front control panel is moved to "In", air from the compressed air system is sent to a hose connected to the power take-off output shaft. The compressed air travels through an axial chamber in the output shaft to three radial chambers, through the radial chambers and three short connected hoses to an actuating member in the clutch. The air pressure inside the actuating member, which is a full-circle neoprene tube, causes the actuating member to expand and apply pressure to the friction faces of the clutch. This engages the clutch.When the cutter control valve is moved to "Out", it stops the air from the compressed air system and vents the clutch actuating member to the atmosphere. This relieves the pressure applied to the clutch friction faces by the actuating member which allows releasing springs to disengage the clutch. The releasing springs will disengage the clutch anytime air pressure is lost in the actuating member. In an emergency, the cutter engine can be shut down by depressing the emergency battery disconnect switch mounted on the forward console. Depressing the switch activates a solenoid in the main battery disconnect switch which moves the main battery disconnect switch to "Off", disconnecting the batteries from the electrical circuit. This closes a solenoid valve, located in the fuel line to the oil pressure sensors, shutting down the cutter engine (engine A). When the main battery disconnect switch is moved to "Off", the Caterpillar 3208 engine (engine B) will not shut down and will continue to drive the alternator. To avoid damage to the alternator, shut down the Caterpillar 3208 engine (engine B) as soon as possible.Anytime major repairs are being made to the machine, move the main battery disconnect switch to "Off". The engine is protected against dust and other foreign material by two dry type induction air cleaners which each have a pre-cleaner, a main filter element and a safety filter element. As the induction air passes through the pre-cleaner, most of the dust is separated out of the air and falls to the bottom of the pre-cleaner. Any particles not removed by the pre-cleaner are trapped by the main filter element. The safety element protects the engine if the main element is damaged. A service indicator on each air cleaner shows when the main element requires service. NEVER OPERATE THE ENGINE WITHOUT BOTH ELEMENTS IN PLACE IN BOTH AIR CLEANERS. Cooling air for the engine is supplied by the 60-inch fan that is belt-driven by the primary (Caterpillar 3208) engine. The fan is mounted at the rear of a large air box that has the hydraulic oil cooler and both engine radiators mounted in the other faces. The fan pulls air through the cooler and radiators and discharges the air to the rear of the machine.
ALWAYS START ENGINE B (CATERPILLAR 3208) BEFORE STARTING ENGINE A (CATERPILLAR 3412) AND ALWAYS CHECK THAT THE AIR BOX COVER IS CLOSED BEFORE STARTING ENGINE B. COOLING AIR WILL NOT FLOW THROUGH THE RADIATORS UNLESS ENGINE B IS RUNNING AND THE AIR BOX COVER IS CLOSED. THE HYDRAULIC MACHINE CONTROLS WILL NOT OPERATE UNLESS ENGINE B IS RUNNING.