User manual BENDIX FD-1 CLUTCH TYPE FAN DRIVE

[. . . ] ® Bendix® FD-1TM Clutch Type Fan Drive AIR INLET BEARINGS PULLEY PRESSURE PLATE BRACKET BEARING RETAINER DOUBLE ROW BALL BEARING FAN PILOT SPRING CAGE SPRING FIGURE 1 AIR PASSAGE O-RING TEFLON BACK-UP RING SHAFT GREASE PASSAGE GREASE FITTING FAN SPACER FRICTION RETAINER NUT MATERIAL PISTON FIGURE 2 DESCRIPTION The Bendix® FD-1TM fan clutch is a pneumatically operated, thermostatically controlled clutch for the engine cooling fan. Its purpose is to maintain engine temperature by engaging or disengaging the cooling fan, thereby providing better fuel economy, greater engine efficiency, faster warm-ups and a quieter vehicle. The FD-1TM clutch is produced in several different models to accommodate the variety of installation requirements resulting from the many engine, vehicle and accessory combinations. Its fail-safe design prevents overheating in the event of air loss or component or air line failure. OPERATION GENERAL The FD-1TM fan clutch replaces the standard fan hub on the engine and is controlled by a temperature sensitive air valve (see Fig. [. . . ] Note that the fan is now engaged and cannot be turned by hand. If it cannot be turned, proceed to test #3. If it can be turned, the clutch is defective and must be repaired or replaced. Check the operation of the thermostatic control valve by running the engine up to operating temperature. Note that the fan clutch engages when engine temperature rises to normal or above and disengages after fan cooling is accomplished. Normal engagement time should not exceed two minutes. If engagement time does 4 (9) (8) (13) (11) (10) (3) (2) (1) (4) (5) (15) (6) (7) (12) (14) (15) (14) FIGURE 9 LEAKAGE CHECKS In order to check for air leakage past the only two sliding o-rings in the FD-1TM fan clutch, it is necessary to disconnect the single air control line. Check for leakage by connecting a 90 cu. reservoir (Bendix part number 225000) with a gauge installed to the control port of the fan clutch. reservoir with 100 psi, allow the pressure to stabilize and observe the time required for the reservoir pressure to drop to 90 psi. If the time required is less than 1 minute, leakage is excessive and repair or replacement is necessary. If the FD-1TM fan clutch fails to operate as described or leakage is excessive, it is recommended that it be returned to the nearest authorized Bendix outlet for a factory remanufactured unit under the exchange plan. If this is not possible, the FD-1TM clutch can be repaired with genuine Bendix parts, in which case the following should be helpful. NOTE: A pressure plate maintenance kit including pressure plate and o-rings is available under pc. 289319. 27/32" DRILL THRU (2 HOLES FOR 3/4 BAR) MAT'L O. H. T. S. TUBING HDN & DRAW RC 40-45 5. 38" 4. 62" 4. 25" REMOVAL It is recommended for ease of repair that the entire fan clutch assembly be removed from the vehicle. Before removing the fan clutch apply the vehicle parking brakes or check the wheels and drain all brake system air pressure. Remove the six cap screws which hold the fan clutch pressure plate and remove the fan. Loosen the fan belts and remove the fan clutch assembly. I< 2. 080 + . 005 >I . 235 + . 002 CENTERED (4 LUGS) 2. 75" 1/32" FLAT FIGURE 10 DISASSEMBLY 1. Remove the 3/8 inch cap screw (1) and washer (2) from the radiator end of the fan hub shaft (see Fig. Remove spring cover (3), spring (4), and thrust washer (5). Remove pressure plate assembly complete and set aside. [. . . ] When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically charged components. Do not attempt to install, remove, disassemble or assemble a component until you have read and thoroughly understand the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools. [. . . ]