SECTION III: PRINCIPLES OF OPERATIONTM 9-2350-256-20end connectors and wedges, guides, and guide caps. The guides ride between the dual wheels and through a trough inthe track drive sprocket hub to maintain track alinement.1-20 FIXED FIRE EXTINGUISHER SYSTEMNOTEThe following callouts are found in Figure 1-12.The M88A1 is equipped with a fixed, carbon dioxide, fire extinguisher system for smothering fires in the engine andwinch compartments. The system consists of eight 10-lb (4.5-kg) cylinders (1), a cylinder control valve (2), remotecontrol connectors (3), two dual-pull mechanisms (4), extinguisher lines, seven nozzles, two exteriorremote control pull handles (5) with cables, twointerior remote control pull handles (6) with cables,1 Cylinderand an engine shutoff switch (7) (to ensure the engine2 Cylinder control valveis turned off before the fixed fire extinguishers are3 Re control connectors4 Dual-pull mechanismdischarged). Each cylinder is equipped with a safety 5 Exterior remote control pull handlesvalve that automatically discharges when pressure6 Interior remote control pull handlesbecomes excessive due to heat. The cylinders are7 Engine shutoff switchmounted in banks of four on each side of the cabinterior.The engine shutoff switch (7) consists of a push buttonswitch assembly (electrically connected in series withthe engine fuel shutoff solenoid and the vehiclebatteries), which is depressed (open circuit) duringvehicle operation by an adjustable screw mounted on ahinged metal shield held in position by a quick-releasepin. When it is necessary to discharge the fireextinguisher system, the push button on the quick-release pin is depressed, allowing the shield to pivotdownward, which releases the adjustable screw fromthe push button on the switch assembly and activatesthe fuel shutoff solenoid, shutting off the engine.1-21 WINCHES, SPADE ASSEMBLY, AND HOISTING BOOMNOTEThe following callouts are found in Figure 1-13.a. MAIN WINCHThe main winch (1) is mounted to the nosepiece of the vehicle beneath the crew compartment. It is gear-driven by ahydraulic motor and is used for heavy-duty recovery operations. The winch is wound with 200 ft (61.0 m) of 1-1/4-in.(31.8-mm) steel cable. The cable is equipped with a clevis on the free end for securing it to loads.1-29Figure 1-12. Fixed Fire Extinguisher System
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