DEMO - 1965 Ford Truck Shop Manual - ForelPublishing.com

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PART 2-6 AIR SUPPLY SYSTEM Section Page 1 Description and Operation Compressor 2-67 2-67 Governor 2-67 2 In-Truck Adjustments and Repairs 2-68 Air Compressor Drive Belt Adjustment. .. . 2-68 Governor Adjustment 2-68 Air Reservoir Safety Valve 2-69 3 Removal and Installation. 2-69 Vertically-Mounted Compressor— With Gas-Engine Trucks 2-69 2-67 Section Page Side-Mounted Compressor— With Gas-Engine Trucks 2-69 Air Compressor With Ford Diesel Engines.. 2-70 Air Compressor—Cummins Diesel N-H Series Engines 2-70 Air Compressor—Cummins Diesel V-6 Engines 2-71 Governor 2-73 Pressure Indicator Valve. , 2-73 4 Major Repair Operations (Not Applicable)... 2-73 DESCRIPTION AND OPERATION The same air supply system is used with either the air-hydraulic booster brake system (Part 2-5) or the full air brake system (Part 2-7). In the air-hydraulic booster system, air pressure increases or "boosts" the hydraulic pressure applied to the shoes. In the full air system, air pressure is applied directly to the shoes through a diaphragm and mechanical linkage. The air supply system consists of the compressor, reservoirs, governor, low pressure indicator and dash gauge. The compressing action of the compressor is controlled by the governor. When reservoir air pressure reaches 100-105 pounds, the gover- D1SCHARGE VALVE FIG. 1 —Air Compressor Operation nor cuts out the compressor. When reservoir pressure drops to 80-85 pounds, the governor allows the compressor to cut in again. When reservoir air pressure drops below 60 pounds, the low pressure indicator valve closes an electrical circuit to a warning buzzer. COMPRESSOR The compressor is a two-piston air pump with an engine pressure lubricating system and water cooled cylinder head and block (Fig. 1). During the downward stroke of the compressor pistons, a partial vacuum is created above the piston and inlet valve. This vacuum above the inlet valve together with the at- RESERVOIR mospheric pressure below the valve automatically opens the inlet valve and allows air to be drawn through the intake filter (air pick up tube on SD V-8 engines) into the cylinder above the piston. As the piston starts moving upward, the air is compressed, and the air pressure on top of the inlet valve together with the inlet valve spring force automatically closes the inlet valve (Fig. 1). As the piston continues moving upward, the air is further compressed until the pressure lifts the discharge valve and allows the air to enter the reservoir. As each piston starts its downward stroke, the discharge valve closes to prevent the compressed air from returning to the cylinder. GOVERNOR The governor (Fig. 2), operating in conjunction with the compressor unloading mechanism, automatically controls the air pressure in the air brake or air supply system between the desired, predetermined maximum and minimum pressures. The compressor runs continually while the engine runs, but the actual compression of air is controlled by the governor which stops or starts compression when the maximum or minimum reservoir pressures are reached. The D-2 governor has a piston upon which air pressure acts to overcome the pressure setting spring and control the inlet and exhaust valve to either admit or exhaust air to or from the compressor unloading mechanism.
2-68 GROUP 2-BRAKES Connections in this system are to the reservoir and compressor unloading ports. There also is an exhaust port. Reservoir air pressure enters the D-2 governor at one of its reservoir ports and acts on the area of the piston and beneath the inlet and exhaust valve. As the air pressure builds up, the piston moves against the resistance of the pressure setting spring. The piston and inlet and exhaust valve move up when the reservoir air pressure reaches the cutout setting of the governor. The exhaust stem seats on the inlet and exhaust valve and then the inlet passage opens. Reservoir air pressure then flows by the open inlet valve, through the passage in the piston, and out the unloader port to the compressor unloading mechanism. The air, besides flowing to the compressor unloading mechanism, also flows around the piston and acts on the additional area of the piston. This additive force, which results from a larger area on the piston, assures a positive action and fully opens the inlet valve. As the system reservoir air pressure drops to the cut-in setting of the governor, the force exerted by the air pressure on the piston will be reduced so that the pressure setting spring will move the piston down. ADJUSTING SCREW RETAINING RING UPPER SPRING SEAT PRESSURE SETTING SPRING LOWER SPRING SEATS GROMMETS INLET AND EXHAUST VALVE INLET-EXHAUST VALVE SPRING FIG. 2—Compressor Governor The inlet valve will close and the exhaust will open. With the exhaust open, the air in the unloader line PISTON COVER ADJUSTING SCREW LOCK NUT BODY ING GUIDE EXHAUST STEM SPRING EXHAUST STEM FILTERS H1342-A will escape back through the piston, through the exhaust stem and out the exhaust port. IN-TRUCK ADJUSTMENTS AND REPAIRS AIR COMPRESSOR DRIVE BELT ADJUSTMENT If the reservoir pressure will not rise to normal or rises too slowly, a slipping compressor drive belt could be the cause. VERTICALLY-MOUNTED COMPRESSOR 1. Loosen the bolts that retain the compressor to the mounting bracket (Fig. 3). 2. Slide the compressor away from the fan pulley until a Vi inch belt deflection (with thumb pressure) is established. 3. Tighten the compressor mounting bolts. SIDE-MOUNTED COMPRESSOR 1. Loosen the idler pulley bracket pivot bolt and adjusting bolt (Fig. 4). 2. Pivot the idler bracket and pulley against the belt until Vi inch belt deflection (with thumb pressure) is established. 3. Tighten the adjusting bolt and pivot bolt with the idler bracket and AIR WATER PRESSURE AIR INLET INLET OUTLET FILTER GOVERNOR FIG. 3—Air Compressor— Vertically Mounted OIL FEED H1039-B pulley assembly in the properly adjusted position. GOVERNOR ADJUSTMENT Before adjusting the pressure settings of the governor, determine the accuracy of the dash gauge by checking gauge readings against an accu- ADJUSTING BOLT )LER PULLEY AND BRACKET ASSEMBLY PIVOT BOLT BELT COMPRESSOR PULLEY H1038-A FIG. 4-Belt Adjustment on Side-Mounted Compressor
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Copyright © 2011, Forel Publishing
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VEHICLE IDENTIFICATION SERIES - (LE
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Q 1 I o I- o I UJ U 1 s CD (3 II CD
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1965 FORD TRUCK IDENTIFICATION INTE
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1965 FORD TRUCK IDENTIFICATION REAR
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2-1 ; . BRAKES ; .•/•.' ' ' ' -
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PART 2-1-GENERAL BRAKE SERVICE 2-3
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PART 2-1 -GENERAL BRAKE SERVICE 2-9
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PART 2-2 HYDRAULIC BRAKES Section P
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PART 2-2-HYDRAULIC BRAKES 2-13 IN-T
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PART 2-2-HYDRAULIC BRAKES 2-15 2. T
Page 30 and 31: PART 2-2-HYDRAULIC BRAKES 2-17 3. I
Page 32 and 33: PART 2-2-HYDRAULIC BRAKES 2-19 4. R
Page 34 and 35: PART 2-2-HYDRAULIC BRAKES 2-21 BRAK
Page 36 and 37: PART 2-2 - HYDRAULIC BRAKES 2-23 4.
Page 38 and 39: PART 2-2 - HYDRAULIC BRAKES 2-25 2.
Page 40 and 41: PART 2-2-HYDRAULIC BRAKES 2-27 STOP
Page 42 and 43: PART 2-3 Section PARKING BRAKES Pag
Page 44 and 45: PART 2-3-PARKING BRAKES 2-31 system
Page 46 and 47: PART 2-3-PARKING BRAKES 2-33 INSTAL
Page 48 and 49: PART 2-3-PARKING BRAKES 2-35 6. Rem
Page 50 and 51: PART 2-4-VACUUM BOOSTERS 2-37 BENDI
Page 52 and 53: PART 2-4-VACUUM BOOSTERS 2-39 force
Page 54 and 55: PART 2-4-MIDLAND DIAPHRAGM-TYPE DAS
Page 56 and 57: PART 2-4 - VACUUM BOOSTERS 2-43 I |
Page 58 and 59: MAJOR REPAIR OPERATIONS PART 2-4 -
Page 60 and 61: PART 2-4-VACUUM BOOSTERS 2-47 SEAL
Page 62 and 63: PART 2-4 - VACUUM BOOSTERS 2-49 sna
Page 64 and 65: PART 2-4 - VACUUM BOOSTERS 2-51 MID
Page 66 and 67: PART 2-4 - VACUUM BOOSTERS 2-53 exc
Page 68 and 69: PART 2-4 - VACUUM BOOSTERS 2-55 NUT
Page 70 and 71: PART 2-4 - VACUUM BOOSTERS 2-57 LOC
Page 72 and 73: PART 2-4 - VACUUM BOOSTERS 2-59 PUS
Page 74 and 75: PART 2-5 AIR-HYDRAULIC BOOSTER Sect
Page 76 and 77: PART 2-5 - AIR-HYDRAULIC BOOSTER 2-
Page 78 and 79: PART 2-5 - AIR-HYDRAULIC BOOSTER 2-
Page 82 and 83: PART 2-6 - AIR SUPPLY SYSTEM 2-69 r
Page 84 and 85: PART 2-6 - AIR SUPPLY SYSTEM 2-71 A
Page 86 and 87: PART 2-6 - AIR SUPPLY SYSTEM 2-73 I
Page 88 and 89: PART 2-7-AIR BRAKES 2-75 PLUNGER RU
Page 90 and 91: PART 2-7-AIR BRAKES 2-77 on bracket
Page 92 and 93: PART 2-7-AIR BRAKES 2-79 DASH FLOOR
Page 94 and 95: REMOVAL AND INSTALLATION PART 2-7-A
Page 96 and 97: PART 2-7-AIR BRAKES 2-83 2. Positio
Page 98 and 99: PART 2-7-AIR BRAKES 2-85 tion of th
Page 100 and 101: PART 2-8-SPECIFICATIONS 2-87 FRONT
Page 102 and 103: INTERNAL EXPANDING SHOE TYPE PARKIN
Page 104 and 105: PART 2-8 - SPECIFICATIONS 2-91 FRON
Page 106 and 107: PART 2-8-SPECIFICATIONS 2-93 FRONT
Page 108 and 109: PART 2-8 - SPECIFICATIONS 2-95 REAR
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DEMO - 1965 Ford Truck Shop Manual - ForelPublishing.com

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