LAMP 4872321 - Caterpillar

Differential Pinion Preload - Adjust
Illustration 1 g02831854
Record the number that is etched into the casting as Dimension (X).
Illustration 2 g02831855
Record the number that is stamped into pinion shaft (1) as Dimension (Y).
Illustration 3 g02831857
Use yoke (2) as a stand. Position head bearing cone (3) into head bearing cup (4). Apply pressure to head bearing cone (3) while turning head bearing cone (3) a minimum of ten revolutions. Measure the thickness of head bearing cone (3) and head bearing cup (4). Record this measurement as Dimension (Z).
Illustration 4 g02831860
Dimension (X), minus Dimension (Y), minus Dimension (Z) equals the required thickness for shim (5).
Illustration 5 g02831863
Lower the temperature of head bearing cup (4). Install head bearing cup (4).
Illustration 6 g02831865
Raise the temperature of head bearing cone (3). Install head bearing cone (3).
Illustration 7 g02831868
Install the same spacer (6) that was removed.
Illustration 8 g02831871
Lower the temperature of bearing cup (7). Install bearing cup (7).
Illustration 9 g02831872
Install pinion shaft (1).
Illustration 10 g02831875
Raise the temperature of bearing cone (8). Install bearing cone (8).
Illustration 11 g02831877
Install yoke (2) and washer (9).
Illustration 12 g02831880
Install spanner nut (10) and only hand tighten. Install bolt (11).
Illustration 13 g02831883
Attach Tooling (B). Attach two suitable vice grips in order to hold pinion flange holder (12) in position. Use Tooling (B) in order to tighten spanner nut (10) (not shown) to a torque of 1200 N m (885 lb ft). Note: Rotate the pinion shaft several times in both directions while tightening spanner nut (10).
Illustration 14 g02831885
Use Tooling (C) in order to check the rolling torque of pinion shaft (1) (not shown). The rolling torque must fall between 1.5 - 4.0 N m (13.28 - 35.40 lb in) without outer seal. Note: If the rolling torque is too low, install a thinner shim. If the rolling torque is too high, install a thicker shim.