Truck/Trailer Refrigeration Unit - Sunbelt Transport Refrigeration

4.5.2 Servicing and Adjusting V-belts (TruckUnits)Table 4-1. Belt Tension (Truck Units)(See Figure 4-5)BELTSTensionCT3-44TV engine (D722) Water pump 30 to 40Engine to Compressor 30 to 50Alternator 30 to 50Standby Motor to Compressor 30 to 50Standby Motor to 1ph Alternator / Gen 30 to 50Engine1 2 3StandbyMotor4CompressorSingle PhaseAlternator (Generator)1. Engine to Compressor V-Belt2. Alternator V-Belt3. Standby Motor to Compressor V-Belt4. Standby Motor to Single Phase Alternator(Generator) V-BeltFigure 4-6. V-Belt Arrangement (Truck Units)a. Alternator V-Belt (Truck Units)1. Make sure negative battery terminal isdisconnected.2. Place V-belt on alternator sheave and drivingpulley.3. Pivot alternator to place tension on belt usinghand force only. Do not use pry bar or excessive force as itmay cause bearing failure. For correct belt tension seeTable 4-1. Tighten pivot and adjustment bolts.b. Water Pump Belt Tensioner (Truck Units)Water pump belt is driven by the diesel enginecrankshaft pulley. The automatic belt tensioner ensuresthe correct tension.To change the water pump belt, proceed as follows:1. To compress the tensioner spring, place athreaded bolt or rod into hole and turn clockwise. Thiswill draw the spring up and slacken V-belt for easyremoval.2. After replacing V-belt, remove the bolt torelease the spring to return the idler to the correcttension.c. Standby Motor--Compressor V-Belt (TruckUnits)1. Remove alternator V-belt.2. Loosen the V-belt idler securing bolt (22mm).3. Replace V-belt and alternator V-belt. Position theidler to correct belt tension. Tighten the idler retaining bolt.d. Single phase Alternator (generator) V-Belts(Truck Units)1. Loosen single phase alternator bolts.2. Replace V-belt and check belt tension. Tightenthe alternator bolt.e. Engine--Compressor V-Belts (Truck Units)1. To allow for easy removal, installation andadjustment of the V-belts, it is recommended that themuffler be disconnected from the muffler bracket andmoved.2. Remove alternator V-belt.3. Remove the standby motor---compressor V-belt.4. Loosen belt idler bolt (24 mm). Move idler toremove V-belts.5. Replace V-belts. Position the idler to the correctbelt tension. Tighten the idler retaining bolt.4.5.3 Servicing and Adjusting V-belts (Trailer Unit)Table 4-2. Belt Tension (Trailer Unit)(See Figure 4-5)BELTSTensionWater pump 35 to 40Condenser Fan 35 to 40Generator 50 to 55Alternator 80 to 90Standby Motor 50 to 551StandbyMotor2CondenserMotorGenerator4Alternator1. Condenser Fan V-Belt2. Standby Motor V-Belt Set3. Generator V-Belt4. Alternator V-BeltFigure 4-7. V-Belt Arrangement (Trailer Unit)3Change 09/954-7 62-02884