Test The Down Limit Switch, Level Sensor - Genie GC-1530 Service Manual

January 2012
B-16
Test the Down Limit Switch,
Level Sensor and Pothole Limit
Switches
Genie requires that this procedure be performed
every 250 hours or quarterly, whichever comes
first.
Maintaining the limit switches is essential to safe
operation and good machine performance.
Operating the machine with a faulty limit switch
could result in reduced machine performance and
a potentially unsafe operating condition.
Perform these procedures with the machine on a
firm, level surface that is free of obstructions.
1 Remove the platform controls from the platform.
2 Raise the platform 7 to 8 feet / 2.1 to 2.4 m.
3 Lift the safety arm, move it to the center of the
scissor arm and rotate down to a vertical
position.
4 Lower the platform onto the safety arm.
Crushing hazard. Keep hands
clear of the safety arm when
lowering the platform.
5 Turn the key switch to the off position.
6 Tag and disconnect the platform control box at
the platform.
7 Follow the platform control cable down the
scissor stack to the alarm bracket on the
chassis deck. Tag and disconnect the platform
control cable from the ECM cable at the 6-pin
Deutsch connector.
8 Securely install the platform control box harness
plug into the 6-pin Deutsch connector of the
ECM cable.
Part No. 228901
Section 3 • Scheduled Maintenance Procedures
Down Limit Switch
9 Disable the down limit switch. Loosen the
fastener securing the roller arm to the limit
switch, and rotate the roller arm 90 degrees in a
downwards direction. Do not activate the switch
contacts.
10 Turn the key switch to platform control.
11 Raise the platform and return the safety arm to
the stowed position.
12 Working at the platform controls, press the lift
function select button. Lower the platform to the
stowed position.
Result: The ground controls LCD displays
"PHS: POTHOLE GUARDS STUCK" and the
platform controls LED displays "PHS". The
alarm sounds and the lift function operates.
The machine is functioning properly.
Refer to the Operation Indicator Codes below.
Result: The ground controls LCD does not
display "PHS: POTHOLE GUARDS STUCK"
and the platform controls LED does not display
"PHS". The alarm does not sound and the lift
function does not operate. Replace the down
limit switch.
GS-30 • GS-32 • GS-46 • GS-47
CHECKLIST B PROCEDURES
LCD display
LED display
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