Section
3-6 AB46 Work Platform
Maintenance
3.5
PROPORTIONAL CONTROL
ADJUSTMENT
Potentiometers are sealed to protect sensitive adjust-
ments from vibrations, or from tampering. Remove
sealant prior to adjustment, and replace after.
NOTE: Do not use silicone sealer; it will damage
pots.
Use a small screwdriver or special adjustment tool to set
adjustment pots. Pots can be easily damaged.
Pots have 15 turns of adjustment, more than one turn
will often be required to complete the adjustment. If
pots have been previously set, reset by turning no more
than 1 turn at a time. If they have not been previously
set, preset to about mid range and start from there.
Turn pot clockwise (CW) to increase settings.
Turn pot counterclockwise (CCW) to decrease settings.
Adjust pots only in sequence as outlined in this procedure.
Rotary Control for Boom Functions
(Figure 3-4)
IMPORTANT: Back out ramp trimpot 10 turns
(counter clockwise) before making any adjustments.
1. Verify that battery is fully charged.
2. Connect ammeter in series at "A" terminal.
3. Set threshold at 1.00 amps or so upper boom
elevates with rotary speed adjustment set on 2 and
raise function switch actuated.
Figure 3-4: Rotary Control Adjustment,
Upper Control Box
Figure 3-3: Proportional Controller
1. Left Handle Half
2. Right Handle Half
3. Handle Boot
4. Gasket
5. Micro Switch (2)
6. Switch
7. Rocker
8. Rocker Boot
9. Electrical Assembly
10. PC Board w/Pot
11. Gear
12. Set Screw
3.5 Proportional Controllers
JOYSTICK HANDLE (FIGURE 3-3)
1. If necessary, remove handle assembly from control-
ler box.
2. Remove and replace defective parts.
3. If replacing PC board with resistor, note resistor
adjustment (number of turns) and adjust new
resistor to match old resistor setting.
NOTE: Check that pot operates correctly when
handle is pushed completely forward and reverse.
Refer to pages 6-50 (Gas) and 6-54 (Diesel) for repair
part numbers.
Ramp
High
Range
Low
Range
Threshold
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