5: Maintenance 375, 375H, 400HH, 425, 425H T4F User Manual
02250223-036 R01
54 Subject to EAR, ECCN EAR99 and related export control restrictions.
The following procedure applies to a compressor with
full-load pressure rating of 100
psig (6.9 bar).
1. Start the compressor and allow the engine to
warm-up
to its normal operating temperature
with the service valve closed.
2. With the service valve closed, adjust the
pressure regulator setting to maintain
115 psig (8 bar) receiver tank pressure.
3. Gradually open the service valve to atmo-
sphere until the engine speed increases and
the receiver tank pressure stabilizes at
100 psig (6.9 bar).
4. Open the service valve to 100 psig (6.9 bar)
(rated full- load pressure) and recheck maxi-
mum engine speed and control response. Close
the service valve and allow the compressor to
cycle and recheck the low engine idle speed.
The following steps apply to “H” and “HH” compressors
eq
uipped
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 4.
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
(13.8 bar) on “HH” models. At this point the
engine should be operating at its rated speed.
5.9.6 Bearing lubrication (American models)
Refer to Figure 5-6. Proper lubrication of the portable
compressor’s bearing axle is critical to it
s 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 lubri-
cated without removing the hubs from the axle. This fea-
ture consists of axle spindles th
at have be
en 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).
WARNING
Operating the compressor at below its minimum
specified idle speed will damage the compres-
sor. Operating the compressor in this condition
will cause coupling and/or compressor failure.
Figure 5-5: Control system adjustment—
dual pressure
1. Compressor air end
2. Warm-up control valve
3. Receiver tank
4. Pressure regulator/blowdown manifold
5. Oil return line
6. High/low pressure valve
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