DA435HA: 99901219:
3-1
19980930
SECTION 3. OPERATION
3-1. GENERAL
Each compressor is bench tested under load at the
factory to ensure proper break-in and operation.
While it is not necessary to follow any break-in
procedure, the following checks should be made
before putting the unit into service, as well as,
periodically during use.
1. Before start-up:
A. Check the oil level in the compressor
crankcase with the dipstick on the unit. If oil is
needed, use only IMTs synthetic compressor
oil. Always check compressor oil level with the
truck and compressor on level ground.
B. Check the air intake filter to make certain
that it is clean and unobstructed. A dirty filter is
a possible cause of reduced air output.
C. Avoid operating the compressor package
when the side-to-side or front-to-rear tilt is
greater than 20°.
2. With the compressor engaged:
Adjust engine speed to ensure that compressor
speed does not exceed 1400 RPM (max) under
load. Crack open air discharge valve until air
pressure drops to 140 PSI and maintains this
pressure without cycling. Doing so simulates a
maximum load condition.
If engine speed increase is required, readjust air
discharge valve to 140 PSI after speed has been
increased. Repeat until appropriate compressor
RPM (NOT engine) is acheived.
Checking compressor RPM can be done using a
phototach on the drive coupling through the air
cleaner access hole. A hydraulic flow meter can
be used, but is nat as accurate.
3-2. OPERATION
To use the compressor, start the vehicle engine and
engage the compressor by operating the compressor
switch.
The system will now function automatically. It will
engage the hydraulic solenoid when the air pressure
is below 120 psi, and disengage when the air
pressure reaches 150 psi.
CAUTION
OPERATING THIS UNIT IN EXCESS OF 1400 RPM,
WILL VOID THE WARRANTY, AND WILL SHORTEN THE
NORMAL SERVICE LIFE OF THE COMPRESSOR.
