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Manitowoc 3900W - Electrical Connection; Maintenance; Troubleshooting

Manitowoc 3900W
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SOLENOID VALVE
Folio 1307-2
For NORMALLY-OPEN operation the air lines must be connected to the valve
ports as shown in Figure 2.
Electrical
Connection
(Figure 3)
If the coil housing is located in an inconvenient position, it may be oriented in
90 degree steps. For 90 degrees, two housing screws must be removed and two
housing plate screws must be relocated. For 180 degrees, only the two housing
screws have to be removed. The screws must be reinstalled after orientation.
Maintenance
(Figure 3)
Troubleshooting
If the valve fails to operate at all, check the coil for shorted or open turns. Also
check supply current. See below if coil is not defective.
External Leakage
If leakage occurs around the sleeve assembly, the metering pins, or the manual
override stem, the O-rings should be removed and inspected for imperfections.
Sticking Or Internal Leakage
If the valve leaks internally or the plunger sticks in the energized position,
examine the soft inserts in the plunger ends or inside the sleeve assembly for
excessive dirt or wear. If the inserts show considerable wear, the plunger
should be replaced.
WARNING
Improper connection of air lines will result in improper operation of system.
FIGURE 2
P
” (in)
A
(cylinder)
E
” (exhaust)
S125
Normally Open
395143

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