Manitowoc MLC650 Service Maintenance Manual

Reference Only
HOISTS MLC650 SERVICE/MAINTENANCE MANUAL
5-60
Published 09-09-16, Control # 229-09
DRUM MOTOR SPEED SENSOR
A speed sensor is installed in each motor. The sensor sends
rotational speed and direction information to the
corresponding control module to be used by the crane
control functions.
Speed Sensor Replacement
See Figure 5-31 for the following procedure.
1. Lockout-tagout the crane.
2. Disconnect the sensor cable (4) from the wire harness.
3. Thoroughly clean all around the sensor to prevent dirt
from entering the hydraulic system.
4. On motors positioned so that the sensor is located on
the underside of the motor, place an appropriate
container under the drain plug and remove the drain
plug.
5. Remove the sensor mounting screws (2).
6. Remove the speed sensor (1) and the O-ring. Be careful
to contain any hydraulic fluid that might drain from the
motor.
7. Clean the mating surfaces, then install a new sensor and
O-ring.
8. Install the sensor mounting screws and tighten to the
correct torque value for the size screw.
9. Connect the sensor cable to the wire harness.
10. On motors positioned so that the sensor is located on
the underside of the motor, perform the following:
a. Make sure that the drain plug is clean, then install
the drain plug.
b. Thoroughly clean all around the fill plug, then
remove the fill plug.
c. Fill the motor with filtered hydraulic oil of the correct
type.
d. Make sure that the fill plug is clean, then install the
fill plug.
11. Operate the hoist and check for a steady drum speed
(rpm) and direction signal on the corresponding drum’s
information display in the cab.
12. Check to make sure there is no oil leakage.
NOTE: The drum (hoist) motor speed sensors are set at
the factory and should not need adjustment.
Weekly Speed Sensor Periodic Maintenance
1. Make sure all the speed sensor assembly parts, wiring,
and connections are secure and undamaged.
2. Operate the hoists to verify that there is a reliable speed
readout on the main display. If there is intermittent or no
readout, troubleshoot the speed sensor assembly.
3. Thoroughly clean the speed sensor of any accumulated
dust and debris.
WARNING
Burn Hazard!
Oil will drain from the port when the sensor is removed.
Wait for the hydraulic oil to cool before removing the
sensor.
Item Description
1 Speed Sensor
2 Sensor Mounting Screw
3 Drum Motor
4 Sensor Cable
FIGURE 5-31

Manitowoc MLC650 Specifications

General

Brand	Manitowoc
Model	MLC650
Category	Construction Equipment
Language	English