3412C GENERATOR SET ENGINE Caterpillar

Start By:

a. remove oil pan

1. Remove bolt (1) and tube (2) from the oil pump.

2. Remove three bolts (3) that hold the pump in position on the block. Remove oil pump (4).

NOTE: The following steps are for installing the oil pump.

3. Install oil pump (4) and the three bolts (3) that hold it in place.

4. Make sure the O-ring seal is in position on tube (2). Install tube (2) on the oil pump. Install the one bolt (1) that holds the tube to the pump.

End By:

a. install oil pan

Disassemble Oil Pump

Start By:

a. remove oil pump

1. Remove the bolt and washer that hold gear (1) in position on the shaft. Remove gear with tool (A).

2. Remove key (2) from the shaft.

Typical Example.

3. Remove the bolts and retainer (7). Remove spacer (6), spring (5), and plunger (4) from the oil pump.

NOTE: The 6N1030 Oil Pump does not have spacer (6).

4. Remove bolts and cover (3).

5. Use tooling (B) to remove two bearings (8) from cover (3).

6. Remove two shaft assemblies (9) from the pump body.

7. Use tooling (B) to remove two bearings (11) from pump body (10). Remove two dowels (12) from the pump body.

Assemble Oil Pump

1. Use tooling (A) to install two bearings (3) in the pump body. The bearing joint must be within 30 ± 15 degrees of a centerline through the bores as shown. The bearings must be installed so they are even with face (A).

2. Install dowels (1) and (2) in the pump body. Install the dowels so each extends 6.40 mm (.252 in) above the surface.

3. Put clean oil on the inside diameter of the bearings in the pump body and on shafts (4) and (5).

4. Install shaft (4) in the lower section of the pump, as shown. Shaft (4) has the groove (slot) for the key.

5. Install shaft (5).

6. Use tooling (A) to install two bearings (6) in the cover. The bearing joint in the bearing must be 30 ± 15 degrees from the centerline through the bores, as shown.

7. Install the bearings so each bearing is even with face (B). Put clean oil on the inside diameter of each bearing.

Typical Example.

8. Install cover (7) on the pump body. Install plunger (8), spring (9), spacer (10), and retainer (11) on the pump. Install the bolts that hold the retainer.

NOTE: The 6N1030 Oil Pump does not have spacer (10).

9. Install key (12) in the shaft.

10. Install gear (13), the washer, and bolt (14). Tighten the bolt to a torque of 54 ± 7 N·m (40 ± 5 lb ft).

11. The pump must turn freely after the pump is assembled.

End By:

a. install oil pump