May 2018 Service Manual
Obstruction Sensing System
Part No. 1275811GT GR
™
• QS
™
R • QS
™
W 91
12-1
Obstruction Sensing Pads
The function of the Obstruction Sensing System is
to detect a person or an object standing on the
machine chassis. When a person or an object is
detected on top of the machine chassis, the
machine platform down function will not operate,
and an alarm will sound. The LCD readout at the
ground controls will display OAC: Obstruction
Above Chassis and the LED readout on the
platform controls will display OAC. Refer to the
examples below.
LCD Readout
LED Readout
How t o Re plac e an O bstr ucti on Sens ing Pad (Q SR m odel s o nly)
How to replace an Obstruction
Sensing Pad (QSR models)
1 QS-12R: Raise the platform approximately 3
feet / 1 m.
QS-15R and QS-20R: Raise the platform
approximately 5 feet / 1.5 m.
2 Open the battery cover. Rest the cover against
the chassis.
3 Lower the platform until the mast just contacts
the battery cover.
Crushing hazard. Keep hands
clear of the battery cover when
lowering the platform.
Turn the key switch to the off position and
disconnect the battery pack from the machine.
Electrocution/burn hazard.
Contact with electrically charged
circuits could result in death or
serious injury. Remove all rings,
watches and other jewelry.
4 At the non-steer end of the machine, unlatch
the covers and open the ground controls
cover.
5 Working with the obstruction sensing pad to
be replaced, locate the pad cables.
6 Carefully pull the cables to identify the
connector cable located at the ground
controls, non-steer end of the machine.
7 After the connector cable has been identified,
tag and disconnect the cable from the
obstruction sensing pad cables.
Note: If the ground controls side or battery box
cover obstruction sensing pad is replaced, carefully
remove the appropriate pin from the male Deutsch
connector. A new Deutsch pin will have to be
installed onto the cable wire of the new ground
controls side pad, or battery box cover pad.
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