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Section 7 • Repair Procedures
PLATFORM CONTROLS
12 Move the lift/drive toggle switch to the drive
position (if equipped).
13 Set the lo range on the circuit board:
Z-20/8N Models: Press down the foot switch,
then move the control handle all the way to the
position. Adjust the lo range trimpot
FORWARD
(item a) on the circuit board to 2.02 to 2.12V
DC. Turn the lo range trimpot adjustment
screw clockwise to increase the voltage or
counterclockwise to decrease the voltage.
Z-20/8 & Z-25/8 Models: Press down the foot
switch, then move the control handle all the
way to the
FORWARD
range trimpot (item a) on the circuit board to
1.95 to 2.05V DC. Turn the lo range trimpot
adjustment screw clockwise to increase the
voltage or counterclockwise to decrease the
voltage.
14 Move the lift/drive toggle switch to the lift
position (if equipped).
15 Lower the boom to the stowed position and
remove the support blocks.
16 At the platform controls raise the boom
approximately 5 feet (1.5 m).
17 Move the lift/drive toggle switch to the drive
position (if equipped).
18 Create start and finish lines by marking two
lines on the ground 40 feet (12.2 m) apart.
Choose a reference point on the machine as a
visual reference for use when crossing the start
and finish lines.
19 Bring the machine to top drive speed before
reaching the start line. Begin timing when your
reference point on the machine crosses the
start line.
7 - 4
position. Adjust the lo
Genie Z-20/8N & Genie Z-20/8 & Genie Z-25/8
20 Continue at full speed and note the time when
the reference point crosses the finish line.
21 Adjust lo range trimpot (item a) on the drive
circuit board to achieve a 40 second drive
speed time. Turn the lo range trimpot
adjustment screw clockwise to decrease the
time or counterclockwise to increase the time.
22 Move the lift/drive toggle switch to the lift
position (if equipped).
23 Lower the boom to the stowed position.
24 Move the lift/drive toggle switch to the drive
position (if equipped).
25 Bring the machine to top drive speed before
reaching the start line. Begin timing when your
reference point on the machine crosses the
start line.
26 Continue at full speed and note the time when
the reference point crosses the finish line.
Z-20/8N Models: Adjust max out trimpot
(item i) on the circuit board to achieve the
specified drive speed time. Turn the max out
adjustment screw trimpot clockwise to
decrease the time or counterclockwise to
increase the time.
Z-20/8 & Z-25/8 Models: Adjust max out
trimpot (item i) on the circuit board to achieve
the specified drive speed time. Turn the max
out adjustment screw trimpot clockwise to
decrease the time or counterclockwise to
increase the time.
First Edition • Third Printing
Part No. 41314
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