the 3412E Hydraulic Electronic Unit Injection
(HEUI) fuel system and engine controls used in the 24H Motor Grader.
The presentation will review the HEUI fuel system mechanical, hydraulic
and electrical/electronic components with particular attention to those
components specific to the 24H Motor Grader.
Each portion of the presentation is followed by a lab exercise to reinforce
the location and function of each major component. These lab exercises
are followed by removal, installation, testing and adjusting activities.
various components in the HEUI fuel system.
A detailed explanation of the system and the various components follows
later in this presentation.
The electronic components in the HEUI fuel system are very similar to
those used in other Electronic Unit Injection (EUI) systems. However, in
the HEUI system, the injectors are not actuated by a camshaft.
A high pressure hydraulic pump, which is supplied with oil from the
pressure side of the engine lubrication pump, raises the pressure to a
maximum of 22800 kPa (3300 psi). The pressure is controlled by the
Electronic Control Module (ECM). The hydraulic flow is directed to
hydraulic actuators in each injector.
The injectors receive an electronic signal from the ECM (as in the EUI
system) to permit oil under high pressure to move a piston which then
moves the fuel plunger.
(HEUI) fuel system and engine controls used in the 24H Motor Grader.
The presentation will review the HEUI fuel system mechanical, hydraulic
and electrical/electronic components with particular attention to those
components specific to the 24H Motor Grader.
Each portion of the presentation is followed by a lab exercise to reinforce
the location and function of each major component. These lab exercises
are followed by removal, installation, testing and adjusting activities.
various components in the HEUI fuel system.
A detailed explanation of the system and the various components follows
later in this presentation.
The electronic components in the HEUI fuel system are very similar to
those used in other Electronic Unit Injection (EUI) systems. However, in
the HEUI system, the injectors are not actuated by a camshaft.
A high pressure hydraulic pump, which is supplied with oil from the
pressure side of the engine lubrication pump, raises the pressure to a
maximum of 22800 kPa (3300 psi). The pressure is controlled by the
Electronic Control Module (ECM). The hydraulic flow is directed to
hydraulic actuators in each injector.
The injectors receive an electronic signal from the ECM (as in the EUI
system) to permit oil under high pressure to move a piston which then
moves the fuel plunger.