JLG 680S, Service And Maintenance Manual, Page: 223 / 530

SECTION 3 - CHASSIS & TURNTABLE
3121234 3-171
Replacing the Fuel Filter
FUEL IS FLAMMABLE AND CAN CAUSE DEATH OR SERIOUS INJURY. MAKE SURE
NO OPEN FLAMES OR SPARKS ARE IN THE AREA WHEN WORKING ON FUEL
SYSTEM. DO NOT SMOKE WHEN WORKING ON THE FUEL SYSTEMS.
1. Wipe the area around the filter to clean any dirt from the
area.
2. Fuel supply from the fuel tank may need to be blocked
to prevent fuel flow from the tank.
3. Undo the fuel filter cartridge and spin off.
4. Catch any escaping fuel.
5. Clean any dirt from the filter carrier sealing surface.
6. Apply a light film of oil or diesel fuel to the rubber gas-
ket of the new filter cartridge.
7. Manually screw in the new filter until the gasket is flush.
8. Tighten the fuel filter cartridge with a final half-turn.
9. Check for leaks.
3.25 DEUTZ EMR 2
The EMR2 consists of the sensors, the control unit and the
actuator. Engine-side controls as well as the JLG Control Sys-
tem are connected by means of separate cable harnesses to
the EMR control unit.
The sensors attached to the engine provide the electronics in
the control unit with all the relevant physical parameters In
accordance with the information of the current condition of
the engine and the preconditions (throttle position etc.), the
EMR2 controls an actuator that operates the control rod of the
injection pump and thus doses the fuel quantity in accordance
with the performance requirements.
The exact position of the regulating rod is reported back and,
if necessary, is corrected, by means of the control rod travel
sensor, situated together with the rotation magnets in a hous-
ing of the actuator.
The EMR2 is equipped with safety devices and measures in the
hardware and software in order to ensure emergency running
(Limp home) functions.
In order to switch the engine off, the EMR2 is switched in a de-
energized fashion over the ignition switch. A strong spring in
the actuator presses the control rod in the de-energized con-
dition into the zero position. As a redundancy measure, an
additional solenoid serves for switching off and this, inde-
pendently of the actuator, also moves the control rod in the
de-energized condition into the zero position.
After the programming, that is carried out over the ISO9141
interface, the EMR2 possesses a motor-specific data set and
this is then fixedly assigned to the engine. Included in this are
the various application cases as well as the customer’s wishes
regarding a particular scope of function.
Each EMR2 module is matched by serial number to the engine.
Modules cannot be swapped between engines.