Reference
Only
SWING SYSTEM
MLC650 SERVICE/MAINTENANCE MANUAL
6-10
Published 09-09-16, Control # 229-09
SWING MOTOR SPEED SENSOR
A speed sensor is installed in each swing motor. The sensor
sends rotational speed and direction information to the
corresponding control module to be used by the crane
control functions.
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
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 speed sensors are 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 contacts the
speed ring.
3.
Turn the sensor counterclockwise 1/2 turn (180°) to
establish the nominal gap of 0.71 mm (0.028 in).
4.
Turn the sensor clockwise until the wrench flats on the
sensor body are positioned at a 22° angle to the pump
shaft centerline.
5.
The final sensor position should be between 1/2 turn
(180°) and 1/4 turn (90°) counterclockwise from the point
where the sensor contacts the speed ring.
6.
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 drives 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
Planetary Swing Drive Assembly—Front
FIGURE 6-10
Summary of Contents for MLC650
Page 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc MLC650 ...
Page 2: ...R e f e r e n c e O n l y ...
Page 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Page 375: ...R e f e r e n c e O n l y ...
Page 376: ...R e f e r e n c e O n l y ...
