PUMP GP-GEAR 3906120 - Caterpillar

Make sure that the top surfaces of injector follower (1) and shoulder (2) are clean and dry.
Place digital indicator (T2) and fixture (T3b) in position on the injector that will be checked. Make sure that the magnetic base of the fixture is on the top surface of injector follower (1). Rod (T3c) must be on the top surface of shoulder (2).
The digital indicator must indicate 0.00 0.20 mm (0.000 0.008 inch).
If the digital indicator indicates 0.00 0.20 mm (0.000 0.008 inch), no adjustment is necessary. Proceed to the next injector to be checked. Repeat the procedure from Step 2. If the digital indicator does not indicate 0.00 0.20 mm (0.000 0.008 inch), proceed to Adjustment Procedure.Adjustment Procedure - Digital Dial Indicator
Loosen the adjustment screw locknut for the injector that is being adjusted.
Illustration 5 g00284832
The installed timing and fuel setting tool group
Turn the adjustment screw until the digital dial indicator indicates 0.00 0.20 mm (0.000 0.008 inch). Tighten the adjustment screw locknut to the torque that is listed in the engines Specifications manual. Then check the adjustment to be certain that the adjustment has not changed. If necessary, repeat this procedure until the adjustment is correct. When the adjustment is correct, proceed to the next injector to be checked. Repeat the procedure from Step 3.
After all injectors are checked and/or adjusted, remove the timing bolt from the flywheel.Test Preparation - Dial Indicator
Note: Calibration of the engine speed/timing sensor is not required unless the timing wheel has been removed from the camshaft or the Electronic Control Module (ECM) has been changed.This adjustment is critical. Ensure that the adjustment of the fuel injector is made properly.
Refer to Testing and Adjusting, "Crankshaft Position for Fuel Injector Adjustment and Valve Lash Setting". All the injectors can be checked or adjusted with the two crankshaft positions in the chart. This action will make sure that the pushrod lifters are off the lobes and on the base circles of the camshaft.Before a check or an adjustment can be made, the tooling must be set to the correct dimension.
Illustration 6 g06346364
(T1b) 6V-3075 Dial Indicator
(T1c) 8S-3675 Indicator Contact Point
(T1d) 9U-5138 Setting Gauge
(T4a) 9U-5137 Magnetic Fixture
(T4c) 122-0449 Rod Sleeve Extension
(T4d) 122-0451 Rod
Place rod (T4d) in fixture (T4a). Install extension (T4c) on fixture (T4a). Install contact point (T1c) on dial indicator (T1b). Install dial indicator (T1b) in extension (T4c).
Make sure that the surfaces of the fixture (T4a) and gauge (T1d) are clean and dry.
Illustration 7 g06346368
Adjustment of the fuel timing tools
(T1b) 6V-3075 Dial Indicator
(T1d) 9U-5138 Setting Gauge
(T4a) 9U-5137 Magnetic Fixture
(T4b) 9U-6272 Nylon Screw
(T4c) 122-0449 Rod Sleeve Extension
(T4d) 122-0451 Rod
Place dial indicator assembly from Step 2 on the top surface of gauge (T1d). Rod (T4d) must be on the top step of gauge (T1d).Note: Gauge (T1d) has two steps. Make sure that the step designation is for the 64.34 mm (2.53 inch) dimension.
Loosen the nylon screw for the dial face of dial indicator