Labrie EXPERT, Maintenance Manual

Page: 219 / 425

General Maintenance
209
When the tailgate is unlocked/open, the tailgate cylinder is partially/fully extended and no triggering
of the proximity switch occurs; the cylinder having moved downward away from the switch
1
. This
activates the backup alarm and a warning buzzer inside the cab. This also turns on the T
AILGATE
U
NLOCKED
warning light in the cab and disables packing.
When the tailgate is closed/locked, the tailgate cylinder is fully retracted and triggering of the
proximity switch occurs; the cylinder having moved upward toward the switch
2
. When the switch is
triggered, the warning buzzer and backup alarm stop sounding, the T
AILGATE
U
NLOCKED
warning
light turns off and packing operation can resume.
However, some troubles may occur if the tailgate unlocked proximity switch is out of adjustment. For
example, the tailgate is locked but the in-cab buzzer is still sounding or the T
AILGATE
U
NLOCKED
warning light is off while the tailgate is still open. In such cases, adjusting the tailgate unlocked
proximity switch is required.
Figure 3 - 303 Location of tailgate unlocked proximity switch
Figure 3 - 304 Proximity switch support assembly
1. The first thing the tailgate cylinder does when the operator presses and holds the T
AILGATE
U
P
switch is to unlock the tailgate, resulting in
the cylinder head moving away from the proximity switch, thus making triggering no more possible.
2. The last thing the tailgate cylinder does when the operator presses and holds the T
AILGATE
D
OWN
switch is to lock the tailgate, resulting in
the cylinder head moving closer to the proximity switch, thus making triggering possible.
Bracket
Cylinder
Proximity
switch