IMPELLER ASSEM. 1M7575 - Caterpillar

Illustration 9 g00337019
Attach a suitable lifting device to intermediate housing (1). Use the suitable lifting device to install intermediate housing (1). Install bolts (2) that hold the intermediate housing to the axle center housing.
Illustration 10 g00844378
Position the axle center housing horizontally on Tooling (A).
Use Tooling (F) and Tooling (G) to tighten adjusting nuts (5) and (16) to a position which maintains gear backlash and slight bearing end play.
Measure the torque that is required to rotate the pinion shaft. Record the measured torque. Use a Tooling (I) on the pinion shaft nut for this measurement.
While you are rotating the pinion shaft back and forth, tighten adjusting nut (16) to the zero backlash position. Then back off adjusting nut (16) by 20 degrees plus the increment to the nearest lock position.
Tighten adjusting nut (5) while you are rotating the pinion shaft. Tighten nut (5) until the torque is increased by 0.2 to 0.6 N m (2.0 to 5.0 lb in) over the torque that was recorded in Step 21. This is the seated position.
Illustration 11 g00315693
Backlash Measurement for the Pinion Shaft Spline
(A) Distance of the dial indicator from the centerline of the pinion.
Note: To ensure correct assembly and correct adjustment, measure the rolling torque of the bevel gear group at the pinion shaft. For new bearings, the rolling torque should be 1.8 to 7.4 N m (16 to 66 lb in). For used bearings, limit the applied torque to one-half of the specification.
Place a dial indicator tangent to the spline, as shown. Make sure that the yoke or the spline adapter is tight to the spline. Measure the backlash between bevel gear (25) and the pinion shaft. The backlash measurement must be 0.30 + 0.12 − 0.10 mm (0.012 + 0.005 − 0.004 inch).The following chart gives examples of backlash at the pinion shaft by showing the different distances from the pinion centerline to the dial indicator.
Table 2
Examples of Backlash at Pinion Shaft
Dimension (A) Nominal Backlash Maximum Backlash Minimum Backlash
50 mm (2 inch) 0.28 mm (.011 inch) 0.40 mm (.016 inch) 0.18 mm (.007 inch)
100 mm (4 inch) 0.55 mm (.022 inch) 0.80 mm (.032 inch) 0.35 mm (.014 inch)
150 mm (6 inch) 0.83 mm (.033 inch) 1.20 mm (.047 inch) 0.53 mm (.021 inch)
200 mm (8 inch) 1.10 mm (.043 inch) 1.60 mm (.063 inch) 0.70 mm (.028 inch)
If the backlash does not meet the specifications, loosen one adjusting nut and tighten the opposite adjusting nut by the same amount. This will maintain the bearing preload.
After the adjustments are made, remove any dyes or paint from the gears.
Install bolt lock (4) and bolt (3) in adjusting nut (5). Do not bend bolt lock (4) at this time.
Install bolt lock (15) and bolt (14) in adjusting nut (16). Do not bend bolt lock (15) at this time.
Illustration 12 g00315875
After the backlash adjustment and the preload adjustment have been made, the tooth contact between the pinion shaft and bevel gear (25) must be