Figure 7-43. Alcohol evaporator, removal, repair, and
chine, and the removal and replacement procedures for
all are basically the same.
(3) Installation. Refer to figure 7-44 and install an air
Figure 7-44. Air reservoirs, removal and replacement.
g. Air Compressor.
(1) General The air compressor is lubricated by oil from
(b) With the engine still running, make a series of brake
the engine system and cooled by water from the
applications to reduce reservoir air pressure. Note
engine system. Therefore, lubrication and cooling
the pressure at which the governor starts the
depend upon proper lubrication and cooling for the
engine. Intake air is taken from the clean air side of
Before adjusting, it is recommended that the gauge
the engine air cleaner.
board pressure gauge be checked with an accurate
(2) Adjustment. The governor should be adjusted so
independent gauge, if one is available.
that it starts compressing air when pressure drops to
105 psi and stops compressing air when pressure
(d) Refer to figure 7-46 and loosen the adjusting screw
reaches 125 psi. To adjust, proceed as follows:
locknut. With a screwdriver, turn the adjusting screw
(a) Start the engine and build up air pressure in the
counterclockwise (viewed from above) to raise the
air brake system. Check the gauge pressure at
pressure settings. Turn the screw clockwise to lower
the pressure settings. Both the starting and stopping
the governor cuts off compression. Pressure
pressure settings will change by an approximately
should be 125 psi.