Usage:
D9N (6XJ1-Up),
D9R (7TL1-Up, 8BL1-Up),
D10R (3KR1-Up) Track-Type Tractors;
24H (7KK1-Up) Motor Grader;
PM-565 (3TK1-Up),
PM-565B (8GS1-Up) Paving Equipment;
631E Series II (1AB1446-Up, 1NB872-Up),
633E Series II (2PS1-Up),
637E Series II (1FB532-Up),
651E (4YR1-Up),
657E (5YR1-Up, 6PR1-Up, 6TR1-Up, 7KR1-Up),
834B (7BR1-Up),
844 (2KZ) Wheel Tractors;
769D (5TR1-Up),
771D (6JR1-Up),
773D (7ER1-Up, 7CS1-Up),
775D (6KR1-Up) Off-Highway Trucks;
836 (7FR1-Up) Compactor;
988F (2ZR1-Up) 990 (4FR1-Up) Wheel Loaders;
5110 (7GN1-Up, 8HN) Excavators
Reference: Special Instruction, REHS0282, "Installation Procedure of the HEUI Pump Compensator Standby Plug for 3408E and 3412E"
Description of Change: The HEUI pump compensator plug regulates the injection actuation pressure between 4.8 and 6.0 MPa (696 to 870 psi) during engine cranking. The new one piece compensator plug replaces the allen head plug and the load sensing screw. The compensator plug is part of a plug kit.
Adaptable To: The 161-8627 Plug Kit is adaptable to the 3408E or 3412E Engines in the above machines.
If the HEUI pump is not providing the required injection actuation pressure during engine cranking, perform the following procedure:
1. Connect the diagnostic equipment (ET or ECAP) to the Electronic Control Module (ECM) in order to monitor the injection actuation pressure.
2. Unplug the injection actuation pressure control valve.
3. Crank the engine and note the injection actuation pressure.
4. Remove the allen head plug.
5. Turn the load sensing screw in approximately two turns.
6. Crank the engine and note the injection actuation pressure.
7. Reconnect the injection actuation pressure control valve when the procedure is completed.
If the injection actuation pressure increases after the load sensing screw is turned, installing the proper one piece compensator plug should correct the condition. Follow the procedure in the Reference publication for installing the appropriate length compensator plug from the 161-8627 Plug Kit.
The following chart lists the parts that are included in the 161-8627 Plug Kit.
