Manitowoc MLC300 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-22-17, Control # 257-02 6-9
MLC300 SERVICE/MAINTENANCE MANUAL SWING SYSTEM
6
SWING MOTOR SPEED SENSOR
The speed sensor sends rotational speed and direction
information to the corresponding control module to be used
by the crane control functions.
See Figure 6-7
for the following procedures.
Speed Sensor Replacement
NOTE: When removing the motor speed sensor (1) from
the swing motor (2), be careful to contain the
hydraulic fluid that will drain from the motor.
1. Loosen the sensor lock nut with an 1-1/16 in hex wrench
and remove the sensor.
2. Install and adjust the new sensor. See Speed Sensor
Adjustment, page 6-9.
3. Before starting the engine, add clean hydraulic oil of the
correct type to the motor’s top case drain port.
Speed Sensor Adjustment
The swing motor speed sensor is set at the factory and
should not need adjustment, unless replaced. When
installing or adjusting the speed sensor on the motor, it must
be set at a specific distance from the speed ring on the unit’s
cylinder.
Adjust the speed sensor as follows.
1. Loosen the sensor lock nut with an 1-1/16 in hex
wrench.
2. Turn the sensor clockwise by hand until it just contacts
the speed ring.
3. Turn the sensor counterclockwise 1/4 turn.
4. Continue to turn the sensor counterclockwise until the
flats on the sensor are 22 degrees to either side of the
motor shaft centerline. Do not turn the sensor
counterclockwise more than 3/4 turn after contacting the
speed ring.
5. Hold the sensor in the position with a 1/2 in hex wrench
while tightening the lock nut to 13 Nm (10 ft-lb).
Weekly Periodic Maintenance
1. Check that all the speed sensor assembly parts, wiring,
and connections are secure and undamaged.
2. Operate the swing drive 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 sensor of any accumulated dust
and debris.
WARNING
Burn Hazard!
Avoid possible injury. 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 Motor Speed Sensor
2 Swing Motor
3 Planetary Swing Drive Assembly
FIGURE 6-7

Manitowoc MLC300 Specifications

General

Brand	Manitowoc
Model	MLC300
Category	Construction Equipment
Language	English