4-28. ENGINE - Continued
Cap all hoses and fittings after removal to prevent contamination.
(1) Tag and remove both air lines from the air compressor governor (1).
(2) Tag and remove the air inlet hose (2) and high pressure hose (3) at the air compressor.
(3) Tag and remove the air compressor coolant hoses (4 and 5).
(4) Remove the oil pressure feed hose (6) from the air compressor crankshaft bearing cap fitting.
(5) Loosen and remove the two capscrews that retain the fire pump governor assembly to the main engine.
Tag and disconnect the water line at the fire pump governor water pressure diaphragm. This will allow
temporary repositioning of the fire pump governor during air compressor removal.
(6) Remove the capscrews (7) and lockwashers (8) that retain the air compressor to the main engine.
(7) Carefully maneuver the air compressor from the engine compartment. Make sure not to drop the drive
coupling (9). Remove the drive coupling from the drive hub (12).
(8) Remove and discard gasket (13).
If the air compressor is to be replaced or overhauled carry out steps 9 thru 12.
(9) Remove the cotter pin (11).
(10) Remove the nut (10).
(11) Pull the air compressor drive hub (12) from the crankshaft (15). Retain the key (14) for inspection prior
(12) Make a sketch and remove all fittings from the compressor.
If air compressor has been overhauled carry out steps 1 thru 3.
(1) Examine the key (14) for damage and replace as necessary. Install key into keyway on crankshaft (15).
(2) Install compressor drive hub (12) onto crankshaft (15) and secure with nut (10). Torque nut to 150 ft lb
(203 Nm). Install cotter pin (11) to secure nut (10).