Manitowoc Published 07-19-16, Control # 249-01 10-47
2250 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
Test 14—Checking System Voltage at the Air Solenoid Panel
To determine if an air solenoid is enabled, place a
screwdriver on the solenoid coil. The solenoid is enabled if
the screwdriver is magnetically pulled toward the solenoid
coil.
Testing air solenoid valves for correct voltage and amperage
requires a standard test plug adapter (which can be ordered
from Manitowoc Cranes) and a digital multimeter. Perform
the following procedure to test for correct voltage and
amperage.
1. Connect the test plug adapter between the solenoid
valve and the electrical connector.
2. Make the connections from the adapter cable white
(positive) and black (negative) wires to the digital
multimeter and check for 12 volts DC while enabling the
air solenoid being tested.
3. Measure load current (amps) by making the current
connections (red and white) to the digital multimeter.
P913
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FIGURE 10-15
Item Description Item Description
1 Front Drum Clutch Solenoid 10 Luffing Hoist Pawl In Solenoid
2 Front Drum Park Brake Solenoid 11 Backhitch Pin Cylinders Retract Solenoid
3 Rear or Right Rear Drum Clutch Solenoid 12 Backhitch Pin Cylinders Extend Solenoid
4 Rear or Right Rear Drum Park Brake Solenoid 13 Upper Counterweight Pin Cylinders Retract Solenoid
5 Left Rear Drum Clutch Solenoid 14 Upper Counterweight Pin Cylinders Extend Solenoid
6 Left Rear Drum Park Brake Solenoid 15 Lower Counterweight Pin Cylinders Retract Solenoid
7 Boom Hoist Pawl-Out Solenoid 16 Lower Counterweight Pin Cylinders Extend Solenoid
8 Boom Hoist Pawl In Solenoid 17 Air Manifold
9 Luffing Hoist Pawl Out Solenoid
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