CONVERSION AR-MACHINE 3727530 - Caterpillar

Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 9U-6198 Crankshaft Turning Tool 1 Start By:
Remove the front cover. Refer to Disassembly and Assembly, "Front Cover - Remove".
Ensure that the No. 1 cylinder is at the top center compression stroke. Refer to Testing and Adjusting, "Finding Top Center Position for No. 1 Piston". Note: The air compressor must be timed with the engine in order to minimize engine vibration.Note: Do not rotate the crankshaft or the air compressor if the idler gear for the air compressor is removed.
Illustration 1 g00946558
Remove the setscrews (8). Remove the retaining plate (7).
Remove the idler gear for the air compressor (6) and the bearing (9) from the idler gear hub (4). Remove O-ring seal (3) from the idler gear hub. Discard the O-ring seal.
Remove the setscrews (1). Remove the idler gear hub (4).
Remove the setscrews that secure the bracket (2) to the front housing (5). Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
A 9U-6198 Crankshaft Turning Tool 1
Ensure that the No. 1 cylinder is at the top center compression stroke. Refer to Testing and Adjusting, "Finding Top Center Position for No. 1 Piston". Note: The air compressor must be timed with the engine in order to minimize engine vibration.Note: Do not rotate the crankshaft or the air compressor if the idler gear for the air compressor is removed.
Illustration 2 g00946558
Position the bracket (2). Install the setscrews in order to secure the bracket to the front housing. Tighten the setscrews to a torque of 35 N m (26 lb ft).
Install a new O-ring seal (3) on the idler gear hub (4). Lubricate the O-ring seal with clean engine oil. Position the idler gear hub and install setscrews (1). Tighten the setscrews to a torque of 60 N m (44 lb ft).
Lubricate the shaft of the idler gear hub with clean engine oil. Install the bearing (9). Lubricate the bore of the idler gear for the air compressor (6) with clean engine oil. Install the idler gear for the air compressor.
Position retaining plate (7) and install bolts (8). Tighten the bolts to a torque of 22 N m (16 lb ft).
Illustration 3 g00946542
Typical Example
Check the backlash between the idler gear for the air compressor and the idler gear. The backlash for the gears is 0.072 to 0.122 mm (0.0028 to 0.0048 inch).
Check the backlash between the idler gear for the air compressor and the air compressor gear. The backlash for the gears is 0.072 to 0.127 mm (0.0028 to 0.0050 inch). End By:
Install the front cover. Refer to Disassembly and Assembly, "Front Cover - Install".