3126B and 3126E On-highway Engines Caterpillar

Installation Procedure

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Illustration 1	g01025556

1. Position drive gear (8) on the unit injector hydraulic pump. Install the bolt on the unit injector hydraulic pump. Tighten the bolt to a torque of 110 ± 14 N·m (81 ± 10 lb ft).

2. Lubricate O-ring seal (7) with clean engine oil. Install the O-ring seal on the unit injector hydraulic pump.
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   Illustration 2	g01025536

3. Position unit injector hydraulic pump (5) on the front housing. Install bolts (6) and tighten bolts (6) to a torque of 28 ± 7 N·m (20 ± 5 lb ft).

   Note: If the engine is equipped with a tube assembly then proceed to Step 4. If the engine is equipped with a hose assembly then go to Step 6.

4. Use Tooling (A) to install tube assembly (1) and tube assembly (2).

   Note: If the engine is equipped with a hose assembly, use Tooling (B). Connect fitting (4).

5. Connect harness assembly (3).

6. Use Tooling (A) to install tube assembly (2).