Manitowoc 3900W - Page 168

MOISTURE EJECTOR VALVE MAINTENANCE
Folio 1002-2
Operational
Checks
Make the following checks after the engine is started at the beginning of each
work shift:
1. Check for air leaks. There must be no leaks in the pilot line to the valve or
at any point on the valve.
2. Observe the valve for proper operation:
The valve should eject air and moisture each time the compressor cuts-in at
the low pressure setting and each time the compressor cut-outs at the high
pressure setting. Refer to Folio 1308 for Air System Pressure Settings.
If the valve does not operate properly, check that the handle is turned all the
out to the AUTOMATIC position. If the valve still does not operate
properly, repair or replace the valve.
3. The valve should feel warm to the touch within 60 seconds after starting
the engine when the outside temperature is 35°F (2°C) or less.
The heater should shut off when the valve temperature rises to
105°F(41°C).
If the heater does not operate properly, check the electrical wires for
continuity. One wire should be connected to ground. The other wire should
be connected to the appropriate power supply (refer to electric schematic in
Operator's or Service Manual).
If the heater still does not operate properly, replace the valve upper body
(houses heater).
FIGURE 2
Electric
Wires
Pilot Port
Automatic
Position
Eject Port
Shut-off
Position
Handle
S110
395143