3500B Engines for Excavators Caterpillar

Illustration 1	g00118286

When the oil scavenge pump is viewed from the drive end the drive rotates in the following direction. ... Counterclockwise

(1) Length of new gears ... 145.000 ± 0.015 mm (5.7087 ± 0.0006 inch)

Depth of bores for new gears ... 145.150 ± 0.020 mm (5.7146 ± 0.0008 inch)

(2) Diameter of new gear shafts ... 31.742 ± 0.008 mm (1.2497 ± 0.0003 inch)

Bore in bearings for new gear shafts after assembly ... 31.837 ± 0.070 mm (1.2534 ± 0.0028 inch)

(3) Distance from the end of the shafts to the gear faces ... 34.0 ± 0.5 mm (1.34 ± 0.02 inch)

(4) The bearings are installed in the pump body at the following depth. ... 1.5 ± 0.5 mm (0.06 ± 0.02 inch)

(5) Bolt

Note: Before installing a gear onto the shaft, clean the shaft and clean the gear's bore with isopropyl alcohol.

Tap on gear in order to seat the taper on the shaft. Tighten the bolt to the following torque. ... 100 ± 20 N·m (75 ± 15 lb ft)

Repeat this procedure until the torque does not change.

Illustration 2	g00118287
Typical Example

Illustration 3	g00118288

(6) Position of bearing joints from the centerline through the bearing bores ... 45 ± 15 degrees

(7) The bearings are installed in the cover at the following depth. ... 1.5 ± 0.5 mm (0.06 ± 0.02 inch)

(8) The dowels extend from the cover at the following distance. ... 6.4 ± 0.5 mm (0.25 ± 0.02 inch)