G3500 Engines Caterpillar


Gear Group (Front)

Usage:

G3508 2TJ


Illustration 1g03022836
Front view of engine

Table 1
Specification for 155-8502 Front Gear Gp 
Item  Qty  Part  Specification Description 
7N-5245 Pump Adapter  After installation, bore of 127-5400 Bushing is 75.000 ± 0.055 mm (2.9528 ± 0.0022 inch)
155-2307 Idler Gear As  After installation, bore of 116-1365 Bearing is 105.970 ± 0.010 mm (4.1724 ± 0.0004 inch).
Installation depth is 2.3 ± 0.5 mm (0.09 ± 0.02 inch)
151-0149 Idler Shaft  Diameter is 105.880 ± 0.020 mm (4.1685 ± 0.0008 inch)
259-4598 O-Ring Seal  Before assembly, lightly lubricate the bores with the lubricant that is being sealed. 
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)
235-3546 O-Ring Seal  Before assembly, lightly lubricate the bores with the lubricant that is being sealed. 
7N-5246 Thrust Washer  Thickness is 8.50 ± 0.05 mm (0.335 ± 0.002 inch).
Width of groove in new pump drive shaft assembly (8) is 8.75 ± 0.10 mm (0.344 ± 0.004 inch).
End play for the pump drive shaft assembly is 0.175 to 0.325 mm (0.0069 to 0.0128 inch)
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. 

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