JLG 80HX_HX+6_HXER Service Manual - Manual (Page 84)

SECTION 2 - PROCEDURES
2-62 – JLG Lift – 3120863
2.26 FREE WHEELING OPTION
To Disengage Drive Motors and Brakes (Free
Wheel) for Towing, etc.
1. Chock wheels securely if not on flat level surface.
2. Disconnect both drive hubs by inverting disconnect
caps in center of hubs.
3. If equipped, move steer/tow selector valve to float
(tow) position by pulling valve knob out.
To Engage Drive Motors and Brakes (Normal
Operation)
1. If equipped, move steer/tow valve to steer position
by pushing valve knob in.
2. Connect both drive hubs by inverting disconnect
cap in center of hub.
3. Remove chocks from wheels as required.
2.27 SPARK ARRESTOR MUFFLERS
The multiple discs on these mufflers will require frequent
cleaning if used with oily or sooty exhaust (diesel), or on
malfunctioning engines (as evidenced by visible exhaust.
2.28 FOOTSWITCH ADJUSTMENT
Adjust so that functions will operate when pedal is at cen-
ter of travel. If switch operates within last 1/4 in. (6.35 mm)
of travel, top or bottom, it should be adjusted.
2.29 HYDRAULIC PUMP W/HAYES PUMP
DRIVE COUPLING LUBRICATION
Any time pump or pump drive coupling is removed coat
pump and drive coupling splines with Lithium Soap Base
Grease (TEXACO CODE 1912 OR EQUIVALENT) prior to
assembly.
2.30 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 LP/Gasoline switch at the ground control station
to the center “off” position. Allow the engine to oper-
ate, without load, until the engine begins to “stum-
ble” 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 no load condi-
tion, throw the “LP/Gasoline” switch at the ground
control station across 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.