JLG 601S Service Manual - Manual (Page 97)

SECTION 3 - CHASSIS & TURNTABLE
3120866 – JLG Lift – 3-57
3.17 DUAL FUEL SYSTEM
IT IS POSSIBLE TO SWITCH FROM ONE FUEL SOURCE TO THE
OTHER WITHOUT ALLOWING THE ENGINE TO STOP. EXTREME
CARE MUST BE TAKEN AND THE FOLLOWING INSTRUCTIONS
MUST BE FOLLOWED.
Changing from Gasoline to LP Gas
1. Start the engine from the ground control station.
2. Open the hand valve on the LP gas supply tank by
turning counterclockwise.
BE SURE ALL GASOLINE IS EXHAUSTED BEFORE SWITCHING
TO LP GAS.
3. While the engine is operating, place the three posi-
tion LPG/Gasoline switch at the ground control sta-
tion to the center “off” position. Allow the engine to
operate without load, until the engine begins to
“stumble” from lack of gasoline.
4. As the engine begins to “stumble”, place the switch
to the LPG position, allowing the LP fuel to be sent
to the fuel regulator.
Changing from LP Gas to Gasoline
1. With engine operating on LP under a no load condi-
tion, throw the LPG/Gasoline switch at the ground
control station to the “Gasoline” position.
2. If engine “stumbles” because of lack of gasoline,
place the switch to the LPG position until engine
regains smoothness, then return the switch to the
Gasoline position. Repeat as necessary until engine
runs smoothly on gasoline.
3. Close the hand valve on the LP gas supply tank by
turning clockwise.
3.18 ELECTRIC GOVERNOR INSTALLATION
AND ADJUSTMENTS - FORD ENGINE
General
These instructions presume no electrical test equipment
other than a multimeter for making the electrical measure-
ments called for on the following pages. If no suitable
meter is available, an inexpensive but adequate meter,
part number 22-188 is available from any local Radio
Shack store.
Many “governor problems” turn out to be installation
problems, particularly in first-time applications. Careful
attention to the directions provided will go far toward a
successful installation made in the least amount of time.
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 — these 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!
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.