3500C Marine Engines Caterpillar

Gear Group (Front) - Reverse Rotation

Usage:

3516C BG3

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Illustration 1	g03334126
Front view of engine

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Table 1
Specification for 386-4848 Front Gear Gp
Item	Qty	Part	Specification Description
1	1	7N-5279 Adapter As	After installation, bore of 127-5400 Bushing is 75.000 ± 0.055 mm (2.9528 ± 0.0022 inch).
2	2	7N-7539 Thrust Washer	Thickness is 8.50 ± 0.05 mm (0.335 ± 0.002 inch).
3	1	144-8263 Idler Gear As	After installation, bore of 140-9597 Bushing is 90.000 ± 0.010 mm (3.5433 ± 0.0004 inch). Installation depth of the bushing is 2.3 ± 0.5 mm (0.09 ± 0.02 inch).
4	1	7C-3258 Thrust Washer Assembly	Thickness of 7C-3257 Thrust Washer is 7.00 ± 0.15 mm (0.276 ± 0.006 inch). Protrusion of 7N-2047 Dowel is 4.5 ± 0.5 mm (0.18 ± 0.02 inch).
5	3	259-4598 O-Ring Seal	Before assembly, lubricate the bore lightly with the lubricant that is being sealed.
6	1	7C-3260 Shaft	Diameter is 89.880 ± 0.020 mm (3.5386 ± 0.0008 inch).

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Illustration 2	g03334127
Section A-A

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Table 2
Item	Qty	Part	Specification Description
7	1	7C-4165 Adapter As	After installation, bore of 127-5400 Bushing is 75.000 ± 0.055 mm (2.9528 ± 0.0022 inch).
8	1	7N-5874 Auxiliary Drive Shaft	Diameter is 74.900 ± 0.015 mm (2.9488 ± 0.0006 inch).
9	1	7N-5245 Pump Adapter	After installation, bore of 127-5400 Bushing is 75.000 ± 0.055 mm (2.9528 ± 0.0022 inch).
10	1	7N-5239 Pump Drive Shaft As	Diameter is 74.900 ± 0.015 mm (2.9488 ± 0.0006 inch). Install the 8T-2153 Socket Setscrew to the bottom of the threaded hole and tighten to 6 ± 1 N·m (53 ± 9 lb in).
11	1	278-4287 Pump Adapter	After installation, bore of 127-5400 Bushing is 75.000 ± 0.055 mm (2.9528 ± 0.0022 inch). During assembly, flush the bushing with the pump adapter surface. Oil hole in the bushing must be aligned with the hole in the bore.
12	2	7N-5246 Thrust Washer	Thickness is 8.50 ± 0.05 mm (0.335 ± 0.002 inch). Width of groove in the new pump drive shaft assembly is 8.75 ± 0.10 mm (0.344 ± 0.004 inch).

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