Manitowoc Published 11-22-17, Control # 257-02 5-39
MLC300 SERVICE/MAINTENANCE MANUAL HOISTS
SPEED SENSOR—HOIST MOTORS
See Figure 5-22 for the following procedure.
For non-free-fall drums only, a speed sensor (1) is installed
in the drum motor (2) for each drum, 1 through 6. The sensor
sends rotational speed and direction information to the
corresponding control module to be used by the crane
control functions.
There is no adjustment for the speed sensors.
Replacement
Replacement is required if a speed sensor is suspected of
sending faulty information to the corresponding control
module.
1. Lockout-tagout the crane.
2. Disconnect the electrical cable (3) from the speed
sensor (1).
3. Thoroughly clean the area around the speed sensor to
prevent dirt from entering the hydraulic system.
4. For drums 1, 4, 5, and 6, place an appropriate container
under the motor to catch any oil leakage.
5. Work quickly to prevent excess oil leakage.
6. Make sure the O-ring is installed on the new speed
sensor.
7. Remove the speed sensor mounting screw (4).
8. Remove the faulty speed sensor.
9. Clean the mating surfaces and install the new speed
sensor and O-ring.
10. Install the mounting screw and tighten the screw to 11,1
Nm (8.2 ft-lb).
11. Connect the electrical cable to the new speed sensor.
12. Operate the drum and check for a steady drum speed
(rpm) and direction signal in the corresponding drum’s
Control Information Screen in the main display.
13. Make sure there is no oil leakage.
WARNING
Burn Hazard!
Hydraulic fluid will drain from the port when the speed
sensor is removed. Wait for the hydraulic fluid to cool
before removing the speed sensor.
Item Description
1 Speed Sensor
2 Drum Motor
3 Electrical Cable
4 Screw (M6 x 1 x 12 mm long)
Typical View (all drums)
Note: For drums 2 and 3, the sensor is
mounted in the top of the motor.
FIGURE 5-22
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