Manitowoc Published 10-09-2020, Control # 259-06 5-27
MLC80A-1/MLC90A-1/MLC100A-1/MLC100-1 SERVICE/MAINTENANCE MANUAL HOISTS
SPEED SENSOR—FREE FALL
See Figure 5-19 for the following procedure.
A speed sensor (1) is installed on the right end of each free
fall equipped drum. The sensor sends rotational speed and
direction information to the corresponding control module to
be used by the crane control functions when operating in
free-fall.
There is no adjustment for the speed sensor.
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 (2) from the speed
sensor (1).
3. Thoroughly clean the area around the speed sensor.
4. Note the orientation of the speed sensor (1) and the
cover (4) with the drum flange.
5. Remove the hex cap screws (3) and pull out the speed
sensor (1), the cover (4), the driver (5) with driver studs
(6) as an assembled unit.
6. Loosen the set screw (8) and remove the driver (5) with
drive studs (6) from the speed sensor shaft.
7. Note the orientation of the speed sensor (1) on the cover
(4).
8. Disassemble the speed sensor (1) from the cover (4)
and discard the speed sensor.
9. Assemble the new speed sensor (1) in the original
orientation to the cover (4) with the phillips head screws,
flat washers, and nuts (9). Apply Loctite 243 to the screw
threads and torque the nuts to 48 Nm (35 ft-lb).
10. Assemble the driver (5) with drive studs (6) to the speed
sensor shaft so the driver is snug against the sensor. Do
not tamper with the position of the drive studs.
11. Clean the mating surfaces of the cover (4) and the drum
flange.
12. Assemble the cover (4), the sensor (1), and the driver (5)
in its original orientation to the drum flange.
13. Rotate the unit as needed to align the drive studs (6)
with the holes in the drive pinion (10).
14. Install and securely tighten the hex screws (3)
15. Connect the electrical cable (2) to the speed sensor (1).
16. 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.
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