JLG 660SJ Service Manual - Manual (Page 149)

SECTION 3 - CHASSIS & TURNTABLE
3121202 – JLG Lift – 3-99
Fuel Filter
Propane fuel like all other motor fuels is subject to con-
tamination from outside sources. Refueling of the equip-
ment’s tank and removal of the tank from the equipment
can inadvertently introduce dirt and other foreign matter
into the fuel system. It is therefore necessary to filter the
fuel prior to entering the fuel system components down-
stream of the tank. An inline fuel filter has been installed in
the fuel system to remove the dirt and foreign matter from
the fuel. The inline filter is replaceable as a unit only. Main-
tenance of the filter is critical to proper operation of the
fuel system and should be replaced as Section 1. In
severe operating condition more frequent replacement of
the filter may be necessary.
Electric Lock Off
The Electric Lock Off device is an integrated assembly.
When energized the solenoid opens the valve and allows
the Propane fuel to flow through the device. The valve
opens during cranking and run cycles of the engine. The
lock off supply voltage is controlled by the engine control
module (ECM).
EPR Assembly
The EPR assembly is a combination Low Pressure Regu-
lator and a Voice Coil Assembly. The Voice coil is an elec-
tronic actuator which is controlled by an internal
microprocessor. The microprocessor provides output data
to the ECM and receives input data over a CAN BUS con-
nection. The internal microprocessor receives electrical
signals from the Fuel Pressure Sensor FPS and the Fuel
Temperature Pressure FTP and communicates the data to
the ECM. The ECM uses the FPS and FTP data to calcu-
late the location of the secondary lever in the LPR and
sends that data back to the EPR via the CAN BUS. The
internal microprocessor in the EPR will then output a sig-
nal, which causes the voice coil to move and position the
secondary lever to the correct location.
Figure 3-75. Electric Fuel Lock Off
1. Pressure Regulator Section
2. Fuel Inlet
3. Coolant Passage 4. Primary Test Port
5. Secondary Test Port
6. Voice Coil Section
Figure 3-76. EPR Assembly