Section 12-03C: Compressor and Clutch, SD-7H15 | 1996 F-Super Duty Motorhome Chassis Cab Workshop Manual |
The SD-7H15 A/C compressor (19703) is an axial compressor with mounting brackets for tangential mounting. The compressor shaft is belt-driven from the engine accessory drive. The pistons, positioned axially around the compressor shaft, are actuated by a swash plate that is pressed on the compressor shaft. The swash plate uses the rotating action of the shaft to provide a reciprocating driving force to each of the pistons.
The SD-7H15 has seven cylinders.
Reed-type suction and discharge valve plates are located between the cylinder assembly and the head.
An integral A/C clutch (2884) is used to drive the compressor shaft. When voltage is applied to the A/C clutch field coil (2987), the clutch plate and hub assembly (which is solidly coupled to the compressor shaft) is drawn by magnetic force toward the A/C clutch pulley (2E884), which rotates freely on the compressor front head casting. The magnetic force locks the clutch plate and hub assembly and the A/C clutch pulley together as one unit. The compressor shaft then turns with the A/C clutch pulley. When voltage is removed from the A/C clutch field coil, a rubber bushing in the clutch plate and hub assembly moves the clutch plate away from the A/C clutch pulley and the compressor shaft ceases to rotate.
| Item | Part Number | Description |
|---|---|---|
| 1 | — | Anti-Rotation Gear (Part of 19703) |
| 2 | — | Cam Rotor (Part of 19703) |
| 3 | — | Clutch Bearings (Part of 19703) |
| 4 | — | Shaft Seal (Part of 19703) |
| 5 | — | Front Housing and O-Ring (Part of 19703) |
| 6 | — | Needle Thrust Bearing (Part of 19703) |
| 7 | — | Piston (Part of 19703) |
| 8 | 19703 | A/C Compressor |
| 9 | — | Pressure Relief Valve (Part of 19D629) |
The A/C compressor is equipped with a thermal protection switch to automatically shut down operation by interrupting the electrical power to the A/C clutch when the compressor temperature exceeds approximately 116°C (240°F). The A/C compressor will automatically restart when it has cooled to approximately 99°C (210°F).
| Item | Part Number | Description |
|---|---|---|
| 1 | — | Compressor Harness Connector (Gray — Part of 14401) |
| 2 | — | Compressor Harness (Part of 14401) |
| 3 | — | Thermal Switch Assembly (Part of 19703) |
| 4 | — | Retaining Plate and Screw (Part of 19703) |
| 5 | — | Compressor Clutch Connector (White — Part of 14401) |