7. After 5 minutes of operation, close the service
valve and attach the hose or service line of the tool or
device to be operated.
8. Open the service valves fully and start the work.
After start-up, the unit automatically provides
compressed air at the discharge service valves. Only
periodic checking of the gauges on the instrument panel
is then required.
9. When the engine is started during the day, after
the first daily start-up, the above warm-up steps maybe
STOPPING THE UNIT. When stopping the
unit at the end of the day, you should take the
1. Close the service valves and permit the engine
to run at idle for 5 minutes. This will allow the engine
coolant temperature to level off and the entire unit to
2. Turn the ignition switch to the OFF position.
COLD-WEATHER START-UP. The following
steps should be completed during cold-weather
1. Start the engine using the heater switch and
priming pump according to the engine manual.
2. Warm the engine until the engine coolant
temperature reaches 120°F. Leaving the side curtains
closed for a few minutes helps the engine to warm up.
3. Turn the ignition switch to OFF.
4. When the engine has stopped, start the engine
again with the service valves partly open. Be sure the
side curtains are open.
5. When the compressor has run for several
minutes and the gauges indicate normal operating
conditions, connect up the tools and go to work.
LUBRICATING THE UNIT. The lubrication
chart in the operators manual for the particular make
and model of compressor you are operating will show
you where the unit should be lubricated, how often to
lubricate, and what lubricant to use. The frequency
will vary depending upon operating conditions and
usage. Operating under abnormal conditions requires
more frequent service.
Before servicing the compressor air system
or compressor oil system, open the service
valves to the atmosphere to relieve all pressure
in the systems.
SERVICING THE AIR CLEANER. A
two-stage, dry type of air cleaner, installed inside the
engine enclosure at the right rear, falters the intake air
(fig. 12-31). Air is drawn into a first-stage element that
causes nearly all the dust in the air to drop into a bin.
Air then enters the second-stage element, a paper
cartridge, where more dust is trapped and collected.
The dustbin should be removed by hand and
emptied daily. Some models have a self-emptying
dustbin that is piped into an aspirator in the exhaust
pipeline, just beyond the muffler. When the aspirator
is used, no alterations are allowed to be made to the
engine muffler or exhaust pipe.
A service indicator is mounted on the side of the
air cleaner housing. As the paper cartridge clogs with
dust, a red indicator flag gradually rises in the window.
When the cartridge is completely loaded, the window
will show all red, and the flag will be locked in place.
It is time to replace the paper cartridge, Discard the
old cartridge and reset the red flag so that the window
shows clear. Cleaning used paper cartridges is not
Figure 12-31.Air cleaner.