300HH, 375, 375H, 375HH, 425 AND 425H USER MANUAL R00 SECTION 5
68
The following steps apply to “H” and “HH”
compressors equipped with dual pressure controls.
1. Start the compressor and allow the engine to
warm up to its normal operating temperature
with the service valve closed and the pres-
sure selector valve set to the LOW position.
2. Follow the procedure for setting the controls
to 100 psig (6.9 bar) rated full load pressure
as describe in preceding steps 2 through 6.
3. Turn the pressure selector valve to the HIGH
position with the service valve closed.
4. Adjust the high pressure regulator so that the
compressor maintains a receiver tank pres-
sure of 165 psig (11.4 bar) on “H” models or
220 psig (15.2 bar) on “HH” models.
5. Gradually open the service valve to atmo-
sphere until the engine speed increases and
the receiver tank pressure stabilizes at 150
psig (10.3 bar) on “H” models or 200 psig on
“HH” models. At this point the engine should
be operating at its rated speed. If necessary
use the HI (+) or HI (-) buttons on the speed
control module to set the specified idle
speed.
BEARING LUBRICATION (AMERICAN MODELS)
Refer to Figure 5-6. Proper lubrication of the portable
compressor’s bearing axle is critical to its proper
function and reduction of wear on this part. Wheel
bearings should be lubricated at least every 12
months, or more, to ensure proper performance and
minimize wear. Use a wheel bearing grease that
conforms to MILSPEC MIL-G-10924 or a high
temperature one such as lithium complex NLGI
consistency #2.
Axles with the E-Z Lube feature can be periodically
lubricated without removing the hubs from the axle.
This feature consists of axle spindles that have been
fitted with a grease zerk in their ends. When grease
is pumped into the zerk, it is channeled to the inner
bearing and then flows back to the outer bearing, and
then back out of the grease cap hold (see Figure 5-
6).
1. Remove the rubber cap from the grease
cap’s end.
2. Using a full charged grease gun, place the
gun onto the grease zerk located on the end
of the spindle. Make sure the nozzle is fully
engaged on the fitting.
3. Pump grease into the zerk. The old grease
will be displaced and flow out of the cap
around the grease gun nozzle.
4. When the new grease starts flowing out of
the cap, disengage the gun and wipe off any
excess off the cap; and replace the rubber
plug.
SU_0000671
1
2
4
5
6
7
3
1. Rubber Plug
2. Outer Bearing
3. Grease Flow
4. Grease Fitting
5. Metal End Cap
6. Inner Bearing
7. Spring Loaded Double Lip Seal
Figure 5-6: Typical E-Z Lube Axle (American model shown)
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