CHAPTER 13 MAINTENANCE OF ENGINE ASSEMBLY

Figure 13-1. Speed Switch,-Exploded View (Mechanical Type Switch) (Code "A")

TM-5-6115-593-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 600 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 CHAPTER 13 MAINTENANCE OF ENGINE ASSEMBLY Section I. GENERAL 13-1. DESCRIPTION. This chapter contains detailed instructions for maintenance of the engine assembly which provides the mechanical power to drive the main generator. The engine assembly consists of a 12- cylinder, V-type, turbocharged, after cooled diesel engine. 13-2. REMOVAL OF ENGINE ASSEMBLY. Refer to Chapter 2, Section IV, and remove the engine or generator assembly, as required, for the replacement of parts, repair, rebuilding, and overhaul of specific components listed in this chapter. Section II. SPEED SWITCH, TACHOMETER DRIVE AND ADAPTER, AND STARTER 13-3. SPEED SWITCH (Code "A"). To adjust and repair the mechanical type speed switch, refer to figures 13-1 and 13-2 and proceed as follows: a. General. (1) The speed switch, driven by the camshaft through a tachometer drive assembly and an adapter, provides sequenced control of circuits during engine startup and protection against engine overspeed during operation. Three sets of contact elements, S9-1, SO-2, and S9-3, contained in the speed switch, are set to open, close, or transfer by centrifugal force at certain engine speeds. The speed switch drive gear is designed to drive the speed switch at one-half engine speed. (2) At an engine speed of 580 to 620 rpm (accelerating) element S9-1 transfers two sets of contacts, energizing the field flash circuit and de-energizing the crank relay to stop the starting motor. (3) When the engine reaches the speed range of 1180 to 1220 rpm, element S9-2 closes, energizing the electrichydraulic governor which takes control of engine speed. (4) Speed switch element S9-3 consists of two sets of contacts which are set to transfer at an engine speed 2250 25rpm to shut down the engine and prevent damage to the equipment. Shutdown is achieved by de-energizing the fuel shut-off valve, cutting off fuel to the engine, and closing the air box solenoid. (5) Elements S9-1 and S9-2 reset at 100 rpm (decreasing) below actuation speed. Element S9-3 is manually reset by a pushbutton on the speed switch housing. b. Speed Switch Removal. Refer to Operator/Crew and Organizational Maintenance manual for removal of the speed switch. c. Speed Switch Tests, Adjustment, Repair and Installation (Mechanical Type Switch). (1) Connect a variable speed drive device to the speed switch drive. The drive device must have a tachometer in order to determine the speed of the device in rpm's. (2) With an ohmmeter on the R1 scale, reading from the speed switch connector, check for the contact conditions of elements S9-1, 13-1

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