Horsepower Limiter Board - Genie Z-45/25 Service Manual

Section 7 • Repair Procedures
PLATFORM CONTROLS
1-2

Horsepower Limiter Board

The horsepower limiter board is responsible for
governing drive pump output. It senses engine rpm
from the alternator. The horsepower limiter board
senses drops in rpm normally due to increased
drive resistance (rough terrain or incline), and
decreases voltage to the drive controller which in
turn decreases voltage to the drive pump, thereby
reducing pump output to maintain optimum engine
rpm and horsepower. Three adjustments are
required for optimum performance.
How to Adjust the Horsepower
Limiter Board
The engine rpm must be
correct before performing this
procedure. See Maintenance
Procedure A-22, Check and
Adjust the Engine RPM, for
Perkins Diesel Models, OR see
B-10 for Ford and Deutz Engine
Models.
Do not adjust the horsepower
limiter board unless the static
battery voltage is above 12V DC
and the alternator is operating
properly with 12.5 to 14.5V DC
output.
Ford models: Perform this
procedure in gasoline mode.
7 - 8
1 Remove the fasteners from the platform
control box lid.
2 Open the control box lid and locate the
horsepower limiter board.
Genie Z-45/25 & Genie Z-45/25J
First Edition • Second Printing
Electrocution hazard. Contact with
electrically charged circuits could
result in death or serious injury.
Remove all rings, watches
and other jewelry.
a
Platform control box
a horsepower limiter board
Part No. 52709