3500B Engines for Caterpillar Built Power Modules Gear Group (Front) Caterpillar


Gear Group (Front)
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Illustration 1g03325358

Front view of engine

Table 1
Specification for 8N-7174 Front Gear Gp    
Item     Qty     Part     Specification Description    
1     1     7N-5245 Pump Adapter     After installation, bore of 127-5400 Bushing is 75.000 ± 0.055 mm (2.9528 ± 0.0022 inch).    
2     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 is
2.3 ± 0.5 mm (0.09 ± 0.02 inch).    
3     1     7C-3260 Shaft     Diameter is
89.880 ± 0.020 mm (3.5386 ± 0.0008 inch).    
4     2     259-4598 O-Ring Seal     Before assembly, lightly lubricate the bores with the lubricant that is being sealed.    
5     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).    
6     1     235-3546 O-Ring Seal     Before assembly, lightly lubricate the bores with the lubricant that is being sealed.    
7     2     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 is
8.75 ± 0.10 mm (0.344 ± 0.004 inch).
End play for the pump drive shaft assembly is
0.250 ± 0.075 mm (0.0098 ± 0.0030 inch).    
8     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.    

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