Section 2 - Service and Repair
Special Switches and Sensors
104045-021 - AB62 Work Platform - European Model
Page 2-9
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W I T C H
The Linkage Limit switch (also known as the Platform Down Limit switch) controls machine functions
based upon whether the elevating assembly is elevated or lowered. When the platform fully lowered and
the boom is retracted, the Linkage Limit switch bypasses the Level Sensor and closes the circuit to the
Platform Down Relay. This allows high speed travel and jib function.
Figure 2-8:
Linkage Limit Switch Adjustment
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1. Lower the platform completely.
2. With the Platform/Chassis switch on CHASSIS, push the Level Sensor
base to test the alarm circuit.
3. If the alarm sounds;
a. elevate the platform and block the elevating assembly,
b. adjust the position of the switch arm by loosening the adjustment
screw and repositioning the arm,
c. lower the platform and re-test the level sensor. When the switch is properly adjusted, the alarm will not
sound.
4. With the platform elevated, repeat step 2. When the
switch is properly adjusted, the alarm will
sound.
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The Level Sensor (also known as the Tilt Sensor) has three wires: red, power (12v in); black, ground; and
white, output (12v out). To verify that the sensor is working properly, there is one red LED under the sensor
that indicates the sensor is off level.
Figure 2-9:
Level Sensor Adjustment
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1. Check tires for proper pressure (not required for poly filled
tires).
2. Place the machine on a firm, level surface.
3. Use Inclinometer to ensure that the front and rear of the
chassis are level within ±1/4°.
4. Adjust the three leveling locknuts until the bubble is cen-
tered in the circle on the attached bubble level.
5. Elevate the platform until Linkage Limit switch opens, and
push the Level Sensor base to test the alarm circuit. The
red LED should turn on, and the alarm should sound.
Adjustment
Screw
Bubble Level
Adjustment
Screws