HORN AS 1747875 - Caterpillar

Illustration 1 g02574476
(1) Water pump drive gear (5) Gear assembly (6) Air compressor drive gear (if equipped) (7) Gear assembly (8) Gear for the fuel transfer pump (10) Crankshaft gear (11) Oil pump drive gearNote: Refer to the following procedure when any bolt or any nut is loosened for service:1. Remove the bolt or the nut.2. Clean the bolt, the nut and/or the stud with a wire brush.3. Apply blue Loctite 242 to the threads of the bolts, nuts and/or studs before assembly.4. A new bolt with a previously applied thread lock is acceptable for use.5. Tighten the bolts, the nuts and/or the studs to the standard torque.Note: Refer to Testing and Adjusting, "Gear Group (Front) - Time" for the backlash adjustment procedure.
Table 1
Specifications for 208-9490 Front Gear Gp, 207-0449 Front Gear Gp, and 248-6767 Front Gear Gp    
Item     Qty     Part     Specification Description    
A     -     -     Before tightening the bolts for the stub shaft, set distance (A) between the centers of camshaft gear (3) and gear assembly (5) with a gauge in order to obtain the gear backlash of
0.3556 0.254 mm (0.0140 0.010 inch).    
Illustration 2 g02574477
Torque sequence for the stub shaft for cluster gear
Table 2
Item     Qty     Part     Specification Description    
2     1     197-4971 Stub Shaft     Tighten five bolts for the stub shaft of the cluster gear assembly to the standard torque in the following sequence. Refer to Illustration 2 - 1, 3, 4, 5, 2, 1, 2, 3, 4, 5, 1    
Illustration 3 g02574478
Illustration 4 g02574479
Torque sequence for the camshaft gear
Table 3
Item     Qty     Part     Specification Description    
4         -     Align the timing mark on the camshaft gear with the timing mark on the front housing when the No. 1 piston is at top center.    
9         -     Align the timing mark on the crankshaft gear with the timing mark on the cluster gear assembly.    
13     1     031-3185 Bolt     Lightly lubricate O-ring seal (12) with 50/50 mixture of 8T-2998 Lubricant and clean engine oil.
Tightening sequence for bolts (13) 1, 4, 2, 5, 3, 6, 1, 4
Torque bolts (13) to
240 40 N m (177 30 lb ft)    
14     -     -     Install the oil groove of the thrust plate toward the face of gear assembly (7).    
15     -     -     Install the oil groove of the thrust plate toward the face of gear assembly (5).    
16     -     -     Install the oil groove of the thrust plate toward the face of cluster gear assembly (2).