HUB-SPROCKET 8E3525 - Caterpillar

Removal Procedure
Start By:
Remove the front cover. Refer to Disassembly and Assembly, "Front Cover - Remove".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Do not turn the crankshaft or the camshaft while the camshaft gear is removed. If the front gear group is not correctly timed during installation, interference can occur between the pistons and the valves, resulting in damage to the engine.
Illustration 1 g01010536
Position the No. 1 piston at the top center of the compression stroke. Refer to Testing and Adjusting, "Finding Top Center Position for No. 1 Piston".
Verify that the timing mark on camshaft gear (1) is aligned with Timing Mark (X) on front housing (3).
Remove bolts (2) and remove camshaft gear (1).Installation Procedure
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Do not turn the crankshaft or the camshaft while the camshaft gear is removed. If the front gear group is not correctly timed during installation, interference can occur between the pistons and the valves, resulting in damage to the engine.
Install the Camshaft Gear in the reverse order of the removal.
Illustration 2 g00593987
Torque sequence for the camshaft gear
Tighten the bolts for the camshaft gear in a numeric sequence 1, 4, 2, 5, 3, 6, 1, 4 to a torque of 240 40 N m (180 30 lb ft).
Check the backlash between the camshaft gear and the adjustable idler gear. The backlash should be 0.356 0.254 mm (0.014 0.010 inch). Refer to Testing and Adjusting, "Gear Group (Front) - Time" for the backlash adjustment procedure.End By:
Install the front cover. Refer to Disassembly and Assembly, "Front Cover - Install".
Perform a timing calibration. Refer to Troubleshooting, "Timing- Calibration".