With HR-6 HE Compressor

DA-6 Compressor, V-Groove Pulley & Standard Mounting:

The Harrison HR-6 HE compressor is a fixed displacement axial piston pump, with three double-ended pistons actuated by an axial (swash) plate shaft assembly. The main pans are the front and rear cylinder, the shaft and axial swash plate, piston group, and valve mechanisms. The cylinders and heads provide an integral external shell.

The piston group of the compressor is not service able. If piston, bearing, ball shoe, shaft and axial plate, or cylinder repair is needed, replace the internal cylinder assembly. All clutch pans, valve mechanisms, and head assemblies are serviceable, plus seals and gaskets.

Refrigerant oil, dispersed in the refrigerant vapor, lubricates the system.

Front Head Assembly:

The front head is shown with three integral mounting flange ears. These ears have 19 mm flats cast to provide for a wrench to be used as a prying means when tensioning the compressor drive belt.

Clutch Driver Design:

Component View:

There are two clutch driver designs for the HR-6 HE compressor: The clutch driver without a torque cushion and the clutch driver having a thin torque cushion).

Note: When servicing clutch drivers with a torque cushion, the clutch hub holding tool J 25030-A is used in place, of J 33027-A.

Keep dirt or foreign material from getting on or into the compressor parts and system. Keep the work area and tools clean.

Keep the pans clean at all times. Clean assembled parts with Trichloroethane, naptha, Stoddard solvent, kerosene, or equivalent solvent and dry. Use only lint free cloths to wipe parts.

The operations described below are based on bench overhaul with the compressor removed from the truck, except as noted. They have been prepared in order of accessibility of the components. When a compressor is removed from the truck for servicing, the amount of oil remaining in the compressor should be drained, measured and recorded. This oil should then be discarded and an equal amount of new 525 viscosity refrigerant oil added to the compressor.

Note: The service compressor is shipped with 236 ml (8 fl.oz.) of 525 viscosity refrigerant oil. This oil should be drained and retained for replacement oil when service procedures required addition of new oil to compressor.

Most minor repair procedures may be done on the truck without discharging the system. Major repair procedures require that the system be discharged of refrigerant.