Genie Z-45/22 Service Manual page 144

Service Manual - First Edition
12V DC or greater
ground
engine rpm sensor
not used
not used
low drive speed limit switch
not used
not used
not used
output to drive controller
Horsepower limiter board
a "A" potentiometer-maximum voltage
output to the controller in the stowed
position
b "B" potentiometer-maximum voltage
output to the drive controller in the
boom elevated position
c "C" potentiometer-reaction rate or
how fast the voltage output reacts to
the change in engine rpm
Electrocution hazard. Contact with
hot or live circuits may result in
death or serious injury. Remove
all rings, watches and other
jewelry.
3 Connect the black lead(-) from a DC volt meter
to the number 2 terminal, and the red lead(+) to
the number 10 terminal.
4 Start the engine from the platform controls.
5 Move the engine speed control switch to foot
switch activated high idle (rabbit and foot
switch symbol).
6 Press down the foot switch and adjust the "A"
potentiometer counterclockwise to increase
voltage or clockwise to decrease voltage.
Specifications - "A" Pot Setting
Voltage setting - 2WD model
Voltage setting - 4WD model
7 Move the engine speed control switch to low
idle (turtle symbol).
Part No. 29487
8 Press down the foot switch and then adjust the
a
b
9 Move the engine speed control switch to foot
10 Press down the foot switch and re-adjust the
c
11 Be sure that the boom is in the fully stowed
12 Disconnect the volt meter.
13 Raise the primary boom above the drive limit
8.0V DC
9.0V DC
14 Drive the boom for 20 feet (6.1m) and record
Genie Z-45/22
Section 7 - Repair Procedures
PLATFORM CONTROLS
"C" potentiometer to obtain a 0.01V DC to
0.03V DC voltage reading.
switch activated high idle (rabbit and foot
switch symbol).
"A" potentiometer to the previous voltage
setting
position, then drive the boom and observe how
the engine rpm reacts to drive control handle
movement. If the machine surges or hunts,
adjust the "C" potentiometer counterclockwise
until surging is minimized..
Under an extreme load, an
excessive counterclockwise
adjustment to the "C"
potentiometer will cause the
engine to stall. The "C"
potentiometer adjustment is a
compromise between engine
stability and engine droop.
switch.
a drive limit switch
the elapsed time. Do this again in the opposite
direction.
a
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