600H, 700HH, 750, 750H, 750HH, 825, 900H, 1050 USER MANUAL SECTION 4
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Reducing Regulator Valve Provides regulated air pressure to the inlet valve.
Control Regulating Valve Provides an air signal to the inlet valve and engine to close the inlet
valve and reduce engine speed to control air delivery according to
demand.
Minimum Pressure/Check Valve Maintains a minimum of 65 psig (4.5 bar) in the compressor receiver
tank. This valve restricts receiver air discharge from receiver/receiver
tank when pressure falls to 65 psig (4.5 bar). Also prevents back flow
into the receiver tank during upload conditions and after shutdown.
High/Low Pressure Selector Switch
(only on dual pressure models) *
Select high pressure 150 psig (10.3 bar) or low pressure100 psig (6.9
bar) at instrument panel to correspond to operator’s needs.
Pressure Relief Valve Opens receiver tank pressure to atmosphere should pressure inside
the receiver tank exceed the pressure relief valve setting.
Air Inlet Valve Regulates the amount of air allowed to enter the compressor. This
regulation is determined by the amount of air being used at the service
line.
Thermal Valve Regulates flow of fluid to and around the fluid cooler. Designed to
maintain a minimum operating temperature; used for fast warm-up at
start-up and to eliminate condensation during operation.
Blowdown Valve * Vents surplus receiver tank pressure to the atmosphere during
operation and shutdown.
Coolant Level Switch Shuts the compressor down and/or prevents it from being started if the
engine coolant level drops too low.
Hydraulic Fluid Sight Glass Monitors fluid level of hydraulic fan drive system. Proper level is filled to
top of sight glass. Should be checked before every startup.
Hydraulic Fluid Level Switch Triggers a warning message when hydraulic system fluid level is low.
Hydraulic Fluid Temperature Sensor Triggers a warning message when the maximum hydraulic fluid
temperature, 225°F (107°C) is exceeded. Normal temperature will
depend on ambient temperature and system loading.
Regeneration Switch * To manually control the exhaust aftertreatment is in soot indicator
levels of 15 - 105%
DPF Lamp * Indicates DPF is above 80% soot loading. Warns operator that
regeneration is required.
Regeneration Inhibited Lamp * Indicates regeneration is inhibited by operator, application, or Cat ET.
High Exhaust System Temperature (HEST)
Lamp *
Indicates that the exhaust aftertreatment is in active regeneration.
Cabin Light Switch * Manually turns interior compressor lighting on.
Menu select switch * Allows the user to make selections in the controller menu, and navigate
the menu structure
Menu Toggle switch * Allows the user to scroll the menu options
CONTROL OR INDICATOR PURPOSE
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