Usage:
3408E (7PR592-Up),
3412E (4CR998-Up) Industrial Engines
Description of Change: A new more robust braided stainless steel hose assembly is now being used in the lines group for the unit injector hydraulic pump used in the above 3408E and 3412E Industrial Engines. This new hose assembly allows for added flexibility and thermal expansion, which will extend its life and improve reliability. The new hose assembly should now be inspected during the daily walk-around inspection.
Adaptable To: The new 162-2501 Hose Assembly replaces the former 107-7942 Hose Assembly, and is used in the 121-4034 Lines Group-Injector Hydraulic Pump for 3408E and 3412E Industrial Engines. The new hose assembly connects the hydraulically actuated electronically controlled unit injector (HEUI) pump to the left pressure manifold. The new hose assembly is in effect as shown above.
Installation Procedure
1. Remove the old hose assembly 107-7942 with all fittings attached.
2. Remove elbow (4) that feeds the left high pressure manifold from the old hose assembly. This piece will be reused in the installation of the new hose assembly.
NOTE: Step 2.5 is for 3408E engines only.
2.5 Remove 7W-6492 Plug from the aftercooler housing. Install new 8T-6762 Square Socket Plug (2) in aftercooler housing (3).
3. Install elbow (4) to the left high pressure manifold and hand tighten.
4. Hand tighten the nut on end A of 162-2501 Hose Assembly (1) to elbow (4).
5. Install hose end B to the pump fitting and tighten the nut to a torque of 125 ± 15 N·m (92 ± 11 lb ft).
6. Hold end A elbow and tighten the jam nut to a torque of 143 ± 15 N·m (105 ± 11 lb ft).
7. Tighten hose end A nut to a torque of 125 ± 15 N·m (92 ± 11 lb ft).