35
375 Caterpillar Standard and Aftercooled/Filtered Operator’s Manual and Parts List
MAINTENANCE
Compressor Unit1.
Air Pressure Gauge2.
Warm-Up Control Valve3.
Receiver/Sump Tank4.
Pressure Regulator/Blowdown Manifold5.
Oil Return Line6.
Blowdown Line (To Fitting At Filter Hose)7.
Figure 5-4: Control System Adjustment –
Standard Pressure
The following procedure applies to a compressor with full-
load pressure rating of 100 psig (6.9 bar).
Start the compressor and allow the engine to warm- 1.
up to its normal operating temperature with the service
valve closed.
With the service valve closed, set the engine low 2.
speed (idle) to its specied setting with the idle stop
screw on the engine injector pump.
Adjust the pressure regulator so that the compressor 3.
maintains 115 psig (8 bar).
Gradually open the service valve to atmosphere until 4.
the engine comes up in speed and sump pressure is
held at 100 psig (6.9 bar). At this point, set the engine
high speed to its specied setting by adjusting the high
idle threaded rod located on the engine speed control.
To raise or lower the speed, lengthen or shorten the
rod respectively.
Open the service valve to 100 psig (6.9 bar) (rated full 5.
load pressure) and recheck top engine speed and
control response. Close the service valve and allow
the compressor to cycle and re-check low engine
speed (idle).
Compressor Unit1.
Air Pressure Gauge2.
Warm-Up Control Valve3.
High/Low Pressure Valve4.
Receiver/Sump Tank5.
Pressure Regulator/Blowdown Manifold6.
Oil Return Line7.
Blowdown Line (To Fitting At Filter Hose)8.
Figure 5-5: Control System Adjustment –
Dual Pressure
WARNING
Operating the compressor at below
its minimum specied idle speed will
damage the compressor. Operating
the compressor in this condition will
cause coupling and/or compressor
failure.
g_5-4a-hi-press-t2-r01
g_5-4std-press-t2-r01
To Next Page
Loading...
