User's Manual

31 LS420 Universal User Manual V2.91 2003-01-21.doc
Chapter 4: Replacing Antennae
4.1 Replacing Load, Angle and Two-block Sensor Antennae V2.1
• There are two types of sensor antennae:
1. Two-block sensor antennae: a blue tape identifies
those made in the spring of 2002 and thereafter, they
are replaceable. The antennae of two-block sensors
made before February 16
th
, 2002 are not replaceable
in the field: please contact your service representative.
2. Load/angle/wind sensor antennae: a green tape identi-
fies those made in the spring of 2002 and thereafter.
All load/angle/wind sensor antennae are replaceable.
Note: two-block sensor antennae are not compatible with
load, angle or wind sensors. Only a two-block antenna is
compatible with a two-block sensor.
• Slightly damaged antennae (bent, sheathing scratched,
plastic head cap missing etc.) should not be replaced
unless otherwise identified as preventing proper sensor
function. Heavily damaged antennae (ripped out, sheared
off, wire exposed and fraying etc.) should be replaced to
ensure communication between the sensor and the cabin mounted display unit.
• The following items are necessary to successfully replace the antenna of a load or angle
sensor:
a) a new antenna, of the appropriate type (load/angle/wind sensor or two-block sensor),
with white nylon hex bolt
b) a small pair of pliers
c) an electrical insulating compound
Step 1.
Place the crane, boom, jib or ball hook such that the sensor is safely accessible.
This procedure may be followed without removing the sensor from the crane only if it is safe to
do so; avoiding removal and reinstallation procedures may save time. If removed, an angle
sensor must be re-calibrated during reinstallation for correct angle display (see the angle sensor
installation section of the user manual).
During this procedure the interior of the sensor must be protected from dust, grime and water at
all times. If it rains during the procedure an umbrella or other suitable means of protection
should be used.
Step 2.
Clean dust, grime and water from the sensor.
Step 3.
Identify the short black whip antenna and the
white hex bolt securing it.
Step 4. Inspect the antenna for signs of obvious
physical damage.
Step 5.
Carefully unscrew the white nylon hex bolt
completely and slide it up the antenna.
Anti
-
two
-
block an-
tenna with
identifying
blue strip
Load/
angle/
wind an-
tenna
with identi-
fying
green strip