CYLINDER 3W8831 - Caterpillar

Adjustment Of The Bearings For The Bevel Gear Shaft:
1. Install bevel gear shaft (3) without bevel gear (4) if the transmission is installed in the machine. Install bevel gear shaft (3) with bevel gear (4) if transmission is removed from the machine.2. Install bearing cage (8) with a full shim pack (9). Install bolts (7) and tighten to a torque of ... 75 10 lb. ft.(100 15 N m)3. Install bearing cage (1) with no shims. Install four of bolts (6) evenly spaced. Gradually tighten these bolts while slowly rotating the bevel gear shaft. Tighten the bolts until there is no end play in the shaft.4. Measure the gap between bearing cage (1) and the bevel gear case in several places. Find the average dimension. From this dimension subtract .012 .001 in. (0.30 0.03 mm) for machines with the larger bearing and .010 .001 in. (0.24 0.03 mm) for machines with the smaller bearing. This new dimension is the amount of shims to be used with bearing cage (1).5. Remove bolts (6) and bearing cage (1). Install shims, cage and bolts. Torque for bolts (6) ... 75 10 lb. ft.(100 15 N m) The thrust side bearing can be a higher capacity (larger diameter) bearing. This can be checked by measuring the outside diameter of the bearing.The standard bearing diameter is ... 4.8 in.(122 mm)The higher capacity bearing diameter is ... 5.4 in.(137 mm)6. Install the bolt for the pilot assembly in the end of bevel gear shaft (3). With a slow steady motion check the torque needed to turn the bevel gear shaft. The correct torque to turn the bevel gear shaft for machines with the larger diameter 5.4 in. (137 mm) bearing is ... 105 to 125 lb. in.(11.9 to 14.1 N m)The correct torque to turn the bevel gear shaft for machines with the smaller diameter 4.8 in. (122 mm) bearing is ... 85 to 100 lb. in.(9.7 to 11.3 N m) Adjustment Of The Free Movement (Backlash)
1. Push the pinion (5) as far to the front of the transmission as possible.2. Install a block of wood between the pinion and bevel gear case to keep the pinion from turning.3. Install a dial indicator so the tip of the indicator is on one tooth of the bevel gear (4).4. Move the bevel gear backward and forward. The free movement (backlash) is the difference in the measurement which is read on the indicator.5. Measure the free movement (backlash) at four places (90° apart) around the bevel gear (4) to find the location of the smallest free movement (backlash). Make sure the pinion (5) is held as far toward the front of the transmission as possible to get the correct measurement.6. The correct free movement (backlash) is ... .010 +.004 -.003 in.(0.25 +0.10 -0.08 mm)The backlash must be kept as close to the .010 in. (0.25 mm) dimension as possible.7. If the smallest amount of free movement (backlash) is