JLG 500RTS Operator Manual - Manual (Page 21)

SECTION 2 - MACHINE PREPARATION AND INSPECTION
3120828 – JLG Lift – 2-7
2.6 LOCKOUT CYLINDER CHECK (IF
EQUIPPED)
To be performed quarterly, any time a system component
is replaced, or when improper system operation is sus-
pected on machines with oscillating axles.
NOTE: Ensure platform is fully lowered prior to beginning
lockout cylinder check.
1. Place a 20 cm (8 in) high block with ascension ramp
in front of the left front wheel.
2. Activate the machine’s hydraulic system from the
platform control station.
3. Place the engine speed and drive speed control
switches to their respective “LOW” positions.
4. Place the drive controller to the “FORWARD” posi-
tion and carefully drive the machine up the ascen-
sion ramp until the left front wheel is on top of the
block.
5. Raise the machine platform approximately 61 cm (2
ft); ensure the lockout cylinder cam valve is free of
the sizzor arm trip bar.
6. Place the drive controller to the “REVERSE” position
and carefully drive the machine off of the block and
ramp.
7. Have an assistant check to see that the left front
wheel remains locked in position off of the ground.
8. Lower the machine platform; the lockout cylinder
should then release the wheel and allow it to rest on
the ground.
9. If the lockout cylinder does not function properly,
have qualified personnel correct the malfunction
prior to any further operation.
2.7 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/GAS SELECT switch at the ground control
station 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, position the LPG/GAS SELECT switch at
ground control to the GAS SELECT 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
GAS SELECT position. Repeat as necessary until
engine runs smoothly on gasoline.
3. Close the hand valve on the LP gas supply tank by
turning clockwise.
2.8 TORQUE REQUIREMENTS
The Torque Chart (See Figure 2-5.) consists of standard
torque values based on bolt diameter and grade, also
specifying dry and wet torque values in accordance with
recommended shop practices. This chart is provided as
an aid to the operator in the event he/she notices a condi-
tion that requires prompt attention during the walk-around
inspection or during operation until the proper service per-
sonnel can be notified. Section 1 of the Service and Main-
tenance Manual provides specific torque values and
periodic maintenance procedures with a listing of individ-
ual components. Utilizing this Torque Chart in conjunction
with the preventive maintenance section in Section 2 of
the Service and Maintenance Manual, will enhance safety,
reliability and performance of the machine.