Maintenance
Section
4-8 AB38 Work Platform
4.7 Switch Adjustments
(Figure 4-7 & 4-8)
TILT SENSOR
Function: This limit switch is activated when the
internal sensor in the ‘Tilt Sensor’ is tilted
3° or more (factory set at this value). When the Tilt
Sensor activates the elevating and telescope extend
functions will be locked out and an audible warning
alarm will sound. It will activate if the Chassis tilts 3°
in any direction. The Tilt Sensor has three wires;
red-power (48V in), black-ground and white-output
(48V out).
Location: The Tilt Sensor is fitted in the rear
Chassis alcove and is a vital part of the
electrical equipment.
Adjustment: To verify the sensor is working properly
there are two LED’s under the sensor;
green indicates the sensor is on (has power), red
indicates the sensor is level and that the white wire is
‘hot’ (48V out).
To adjust the mechanism of the Tilt Sensor, (but not
the value of tilt allowed), the following procedure can
be followed:
1. Place the machine on firm level surface ± 0.25°.
2. Use Inclinometer to ensure that the front and rear
of the Chassis are level to within ± 0.25°.
3. Using a bubble level adjust the three levelling
locknuts on the Tilt Sensor, until the bubble is
centred.
4. Elevate the platform until the Boom Rest Switch
opens and depress the Interlock Switch on the
Joystick. Ask a colleague to push the tilt sensor
base to test the alarm circuit. The alarm should
sound. If the alarm does not sound readjust the Tilt
Sensor until the alarm does sound.
4.7
BOOM REST LIMIT SWITCH
Function: This limit switch is activated when the
Elevating Assembly is fully stowed and
the upper boom is sitting in the boom rest. The Boom
Rest is located on the side of the First Post on the
AB38 Work Platform. The high speed drive can only
be operated when this switch is activated. When the
boom leaves the boom rest the Normally Open con-
tacts of the limit switch open and power is cut to the
high speed drive function.
Location: The switch is located on the side of the
First Post on the Boom Rest Weldment.
Adjustment:The switch should be activated when the
boom sits in the boom rest. The lever is
adjustable and should be adjusted so that the
switch’s activation/deactivation point occurs just as
Boom 2 leaves the Boom Rest. To adjust the switch
loosen the lever clamping nut and rotate the lever.
Tighten the lever clamping nut. The switch should
periodically be checked for freedom of movement and
be kept clean from dirt and other contaminants that
might affect its free movement.
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