Greer Company
Greer Company
Greer Company
Greer Company
Crane Systems
1918 EAST GLENWOOD PLACE, SANTA ANA, CA 92705
Tel: (714) 259 9702 Fax: (714) 259 7626
MicroGuard
424 Operation/Troubleshooting Manual Horizontal Display Hydraulic Cranes
43 of 52
W424103 REV A 02/13/01
PARTS REPLACEMENT
PARTS REPLACEMENT
PARTS REPLACEMENT
PARTS REPLACEMENT
PRESSURE TRANSDUCER REPLACEMENT
PRESSURE TRANSDUCER REPLACEMENT
PRESSURE TRANSDUCER REPLACEMENT
PRESSURE TRANSDUCER REPLACEMENT
1. It is recommended that the replacement transducer
is closely matched to the sensitivity of the old
transducer. The sensitivity value is recorded on the
serial number plate.
2. Remove the connector connecting the transducer to
be replaced from the computer box.
3. With the boom cylinder completely retracted, in the
rest, or with the boom safely supported, remove the
transducer to be replaced.
4. Install the new transducer on the boom hoist
cylinder.
5. Run the cable to the computer box and connect it to
the appropriate computer box connector.
6. Pick a known weight to verify the accuracy of the
system. If the load reading is not within tolerance
after the replacement of a pressure transducer, carry
out Command 6 (Pressure) of the MG414 Calibration
procedure.
EXTENSION REEL REPLACEMENT
EXTENSION REEL REPLACEMENT
EXTENSION REEL REPLACEMENT
EXTENSION REEL REPLACEMENT
To replace the extension Reel assembly, use the
following procedure:
1. Fully retract the main boom.
2. Disconnect the connector to the Two-Block switch
and remove the cable from the main boom head
anchor. Allow the cable to retract onto the reel, be
careful not to let the cable retract too rapidly.
3. Remove the Extension Reel Cable connector.
4. Remove the four mounting bolts (5) securing the
Extension Reel to the boom and remove the reel.
5. Mount the new reel to the boom, secure with the
mounting bolts and connect the Extension Reel
Cable Connector.
6. Remove the shipping cable clamp from the new
cable and allow it to slowly rewind onto the Extension
Reel until there is no pre-tension. Continue to re-
wind the reel in the same direction until the distance
between the boom head and the connector is
approximately 12 ft. At this point there will be no pre-
tension.
7. Pull the cable out passing it through the cable guides
until the end of the cable is 3 ft. beyond the boom
head.
8. Wrap the cable around the boom head anchor a
minimum of five times and secure with a wire tie or
the shipping cable clamp.
9. Connect the cable to the connector coming from the
Two-Block switch.
10. Manually turn the large gear connected to the
potentiometer fully counter-clockwise.
11. Observe the length display and turn the large gear at
least 3 clicks clockwise until the length display reads
the retracted boom length.
12. Replace the Extension Reel Cover, securing it with
the four screws.
13. Extend and retract the main boom and see that the
boom length reading on the display is correct.
BOOM ANGLE SENSOR REPLACEMENT
BOOM ANGLE SENSOR REPLACEMENT
BOOM ANGLE SENSOR REPLACEMENT
BOOM ANGLE SENSOR REPLACEMENT
HTC8660 ONLY
HTC8660 ONLY
HTC8660 ONLY
HTC8660 ONLY
To replace the Boom Angle Sensor use the following
procedure:
1. With the power off, disconnect the Boom Angle
Sensor cable from the sensor located on the left side
of the boom near the boom extension reel.
2. Remove the two bolts securing the sensor to the
boom and remove the old sensor.
3. Install the new sensor on the boom, secure it loosely
with the mounting bolts and connect the cable.
4. Raise the boom to a 60° angle and verify the angle
with an inclinometer. While viewing the display adjust
the sensor until the display reads 60° and tighten the
mounting bolts.
5. Place the boom horizontal, verify that it is at 0° with
an inclinometer.
6. Verify that the displayed boom angle
is reading 0° +/- 0.5°.
