JLG 660SJ Service Manual - Manual (Page 148)

SECTION 3 - CHASSIS & TURNTABLE
3-98 – JLG Lift – 3121202
2. Remove the radiator cap. Fill the radiator with cool-
ant until coolant starts to appear from the previously
removed hose at the EPR. Reinstall the hose back
onto the EPR and continue to fill radiator with cool-
ant.
3. With the radiator cap still removed, start the engine
and run until the thermostat opens. The thermostat
opens at 170° F (77° C), which can be checked
using the JLG handheld analyzer.
WHILE ENGINE IS RUNNING, AIR AND/OR STEAM MAY BE PRES-
ENT COMING FROM THE RADIATOR. THIS IS NORMAL.
4. After running the engine for 5 minutes after it has
reached operating temperature, shut the engine off
and continue to step 5.
WITH THE ENGINE RUNNING OR WHEN SHUTTING OFF THE
ENGINE, SOME HEATED COOLANT MAY SPILL OUT DUE TO AIR
"BURPING" OUT OF THE SYSTEM WITH THE RADIATOR CAP OFF.
5. Next, verify that the 2 coolant hoses on the EPR are
warm. If they are not warm repeat step 3 and 4, oth-
erwise continue to step 6.
A PROPERLY PURGED COOLING SYSTEM WILL YIELD A WARM
UPPER RADIATOR HOSE AND A WARM EPR HOSE. IF THE UPPER
RADIATOR HOSE AND/OR EPR HOSE ARE NOT WARM TO THE
TOUCH AFTER THE ENGINE HAS RUN FOR 5-8 MINUTES AFTER
REACHING OPERATING TEMPERATURE, THE SYSTEM MAY STILL
CONTAIN AIR. IT MAY BE NECESSARY TO REPEAT THE ABOVE
STEPS.
6. Fill radiator with coolant as needed and install the
radiator cap. Next, remove the cap off the coolant
recovery bottle and fill just below the HOT FULL line
and reinstall the caps.
3.19 GM ENGINE DUAL FUEL SYSTEM
The Dual Fuel system allows the operator to operate the
vehicle on either gasoline or LPG by positioning a selector
switch in the operator's platform. When the operator
places the selector switch in the gasoline mode the gaso-
line fuel pump is energized. While in the gasoline mode
the LPG fuel lock-off is isolated and will not energize. In
addition the gasoline injector circuit is enabled and injec-
tor pulses are provided to each injector and the ECM cali-
bration for gasoline is also enabled. When the operator
selects the LPG mode the Low Pressure LPG lock-off is
energized and fuel from the LPG tank flows to the Elec-
tronic Pressure Regulator (EPR). The EPR receives an
electronic signal to position the secondary lever for the
start or run positions and when the engine begins to crank
the mixer air valve will rise and fuel will begin flowing to
engine. During this mode the gasoline fuel pump is iso-
lated and will not be activated. The primary components
of the gasoline dual fuel system are the gasoline tank,
electric fuel pump and filter, fuel supply line, injector rail
and injectors and the fuel pressure regulator. The primary
components of the LPG dual fuel system are the LPG fuel
tank, in-fuel filter, LPG Low Pressure lock-off, Electronic
Pressure Regulator (EPR) and the fuel mixer module. The
LPG fuel system operates at pressures which range from
14.0 inches (355.60 mm) of water column up to 312 psi
(21.5 BAR).
Components which are shared by both systems include
the Electronic Throttle Control and the ECM. The ECM
contains a dual calibration; one controls the gasoline fuel
system during gasoline operation and one controls the
LPG fuel system during LPG operation.