3412C Engine Caterpillar

Output ... 272 L/min (72 US gpm)

The output requires a pressure of the following value. ... 310 kPa (45 psi)

The oil pump must have the following speed in order to obtain the output. ... 2550 rpm

Output ... 144 L/min (38 US gpm)

The output requires a pressure of the following value. ... 560 kPa (81 psi)

The oil pump must have the following speed in order to obtain the output. ... 2550 rpm

Illustration 1	g00285531

(1) Diameter of new drive shaft ... 22.217 ± 0.005 mm (.8747 ± .0002 inch)

Bore in bearings for new drive shaft ... 22.258 ± 0.008 mm (.8763 ± .0003 inch)

Diameter of new idler shaft ... 22.217 ± 0.005 mm (.8747 ± .0002 inch)

Bore in bearings for new idler shaft ... 22.258 ± 0.008 mm (.8763 ± .0003 inch)

(2) Gears

Length of new gears ... 79.375 ± 0.025 mm (3.1250 ± .0010 inch)

Depth of bores for new gears ... 79.502 ± 0.020 mm (3.1300 ± .0008 inch)

(3) 2S-2760 Spring

Length under test force ... 117.9 mm (4.6417 inch)

Test force ... 490 ± 27 N (110 ± 6 lb)

Free length after test ... 152.9 mm (6.02 inch)

Outside diameter ... 27.00 mm (1.063 inch)

Note: The 2S-2760 Spring is for the relief of oil pressure.

Illustration 2	g00285533
Oil pump cover

Illustration 3	g00285532
Oil pump body

(4) Bearing junction

(5) Position of bearing junction from the centerline through bearing bores ... 30 ± 15 degrees

Note: Bearings should be installed so that the edge of the bearing is flush with the outside of the oil pump body. The bearings should also be installed so that the edge of the bearing is flush with face (6) .