JLG 450AJ ANSI Service Manual - Manual (Page 67)

SECTION 2 - PROCEDURES
3120749 – JLG Lift – 2-49
Quick-start Installations
If you are experienced in installing and adjusting Electric
Governor, follow these steps. Otherwise, refer to the more
detailed instructions starting with MOUNTING-ACTUA-
TOR.
1. Mount Actuator rigidly to engine location which will
permit a short, straight linkage to the carburetor or
fuel valve. Avoid very hot areas.
2. Mount controller in a dry, fairly cool location. Acces-
sibility for adjusting is required.
3. Wire per appropriate included schematic, using #16
wire.
4. Set up fuel linkage. This is critical, so review the sec-
tion titled LINKAGE.
5. Hold linkage for safety, and start engine.
6. Adjust engine speed to desired valve using High
Engine pot. Turn CW to increase, CCW to decrease
speed. (See diagram on page 43 E-331 Electronics -
Adjustment Locations.)
Mounting-Actuator
The Actuator may be mounted in any attitude; there is no
preferred orientation.
With no power applied, the Actuator is spring-loaded to
the minimum fuel position. The Actuator output shaft
rotates toward the maximum fuel position against this
spring through electrical power from the controller. This
rotation is CW (clockwise) on one side of the Actuator, and
CCW (counterclockwise) on the other. If necessary,
reverse the Actuator on its mounting plate so that the
desired direction of rotation is on the desired side to
match the fuel system direction of travel.
Before selecting the mounting location, consider the link-
age that will be required to connect the Actuator output
arm to the butterfly or fuel valve. Read the following sec-
tion on linkages before deciding on a mounting location!
1. Mount Actuator rigidly to engine location which will
permit a short, straight linkage to the carburetor or
fuel valve. Avoid very hot areas.
Linkage
1/4" -28 threaded rod and low friction rod-end bearings
are recommended for linkage materials.
Keep the linkage as short and as straight as possible.
The linkage must not rub against the engine, brackets,
hoses, etc. The linkage must be free of friction and lost
motion or slop.
The following sketch indicates the proper linkage geome-
try for most installations.
Note that the angle between the carburetor arm and the
rod is 70 degrees with the engine at idle. This is highly
desirable! Note also that the Actuator arm travels equally
on either side of a 90 degree angle with the rod. This
angular arrangement will give the proper mechanical gain
for good stability and performance. It may be necessary to
rotate the carburetor arm relative to the butterfly to
achieve this. This can usually be done, and is usually
worth the effort! Below are some workable installations,
with good linkages. Remember, the Actuator can be
turned 180 degrees on its mounting to reverse the spring-
loaded direction. Also, the Actuator can be mounted in
any attitude.
70 degrees
Engine at idle
Engine at max
Spring-loaded
to idle
70 degrees
Engine at max
Engine at idle
Spring-loaded
to idle
70 degrees
Engine at idle Engine at max
Spring-loaded
to idle