Manitowoc Published 10-01-2012, Control # 045-08 10-47
777 SERVICE MANUAL TROUBLESHOOTING
10
Test 17 – Testing the Motor PCP and Pump EDC
Testing any of the motor PCP’s or pump EDC’s requires a
standard test plug adapter (which can be ordered from
Manitowoc Cranes, Inc.) and a digital multimeter.
To test motor, connect the adapter to the motor PCP to be
tested. Leave the PC end of the adapter disconnected. Make
the appropriate connections (white and black) from the
adapter cable to the digital multimeter and verify a resistance
of 24 to 26 ohms. Reconnect the adapter cable connections
(white and black) between the PC input cable and the digital
multimeter for measuring volts DC. Slowly actuate the
appropriate control handle in the operator’s cab and verify
the range of voltage change is between 0 and 1.96 volts DC.
The load current (or amperage draw) at any given point in
the high speed to low speed range and vice versa is
equivalent to the voltage at the given point in the speed
range. Load current (amps) can be measured directly by
making the appropriate adapter connections (red and white)
to the digital multimeter.
To test pump, remove the PC input line from the pump EDC
and connect the adapter in its place. Perform the same tests
as described above (for motor) and verify 15 to 19 ohms and
0 to ±2.45 volts DC with amperage equivalent to the voltage
at any given point in the speed range.
Item Description Item Description
1 Motor 4 Manual override
2 Manual override 5 Pump EDC
3 Motor PCP 6 Pump
FIGURE 10-22
P574
P966
54 6
1
2 3
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