Upright AB46 C, Service & Parts Manual

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Section
3-7 AB46 Work Platform
Maintenance
3.7
Figure 3-6: Platform Down Limit Switch
4. Set high range at 1.80 amps or so upper boom
functions operate with speed adjustment on 9 or
highest speed position. Check for proportional valve
vibration. Valve is fully closed when it does not
vibrate when energized. Do not over adjust.
5. Set low range at 1.15 amps or so machine slews 180
degrees in 45 seconds with speed control set at
position 9 or full speed.
6. Turn ramp trimpot back in 10 turns. Set ramp
trimpot until machine has a smooth start or upper
boom delays 2 seconds with raise switch actuated
and speed control set at position 9 or full speed.
Proportional Drive Control
(Figure 3-5)
IMPORTANT: Back out ramp trimpot 10 turns
(counter clockwise) before making any adjustments.
Adjusting one pot affects the setting of others. After
making all adjustments recheck each function to verify
settings.
1. Adjust threshold pot at .45 amps or so machine
barely creeps as first LED lights.
2. Adjust A, B pot at 1.15-1.20 amps or so machine
travels 40' in Eight seconds.
3. Adjust mid pot so machine travels One foot per
second when platform is elevated.
4. Turn ramp back in 10 turns and adjust until ma-
chine stops in 2 to 3 feet from full speed when
joystick is released.
DO NOT attempt to adjust Limit Switches
without first blocking the elevating assem-
bly (see section 3.1).
1. Lower the Platform completely.
2. With the Platform / Chassis switch on Chassis, push
the Tilt Sensor base to test the alarm circuit.
3. If the alarm sounds, elevate the platform and adjust
the position of the switch arm by loosening the
adjustment screw and repositioning the arm. Lower
the platform and retest. If down limit switch is
properly adjusted, the tilt alarm will not sound.
4. With platform elevated, repeat step 2. When switch
is properly adjusted, alarm will sound.
Down Limit
Switch
Adjustment
Screw
3-6 Platform Down Limit Switch
(Figure 3-6)
The Platform Down Switch bypasses the Tilt Sensor
when the platform is fully lowered and closes the circuit
to the Platform Down Relay, which allows high speed
travel, cage trim function and turret rotation.
Figure 3-5: Proportional Control Adjust-
ment, Upper Control Box
Ramp
Low
Range
"A"
Range
"B"
Range
Mid
Range