3306B Generator Set Caterpillar


Generator Bearing - Inspect

Usage:

3306B B8D
The following maintenance procedure for generator bearings should be followed at every major engine overhaul:

  1. Remove the bearing bracket. Inspect the following items: bracket bore, bearing outer race and rolling elements. On Standby Power Units, the bearing must be inspected and the grease must be replaced at 3 year intervals. The bearing bracket sleeve should be inspected for out of roundness, excessive wear, and a bracket step that is less than 0.0762 mm (0.0030 inch). If there is no bearing bracket sleeve, inspect the bearing bracket bore. The bearing should be inspected for outer race damage, severe fretting, and smoothness of operation. When possible, the bearing elements should be inspected. Some double-shielded ball bearings prevent visual inspection of the ball bearing elements. Other double shielded ball bearings have a retaining ring. This retaining ring can be removed in order to allow access for a visual inspection of the ball bearing elements.

    On two-bearing generators, the front bearing can only be removed after the hub is removed. In order to remove the hub, cut off the hub. Pulling the hub will damage the shaft.

    Note: Bearings that are being removed for failure analysis should not be cut off with a torch.

  1. Spherical Roller Bearing should be cleaned and repacked with 108-8611 Grease. Pack the bearing and pack the cavity (one-third to one-half of the cavity volume). The bearing should be filled with 88.8 mL (3 ounces) to 118.4 mL (4 ounces) of grease. The cavity should be filled with 118.4 mL (4 ounces) to 148.0 mL (5 ounces) of grease. Refer to Table 1.

  1. All ball bearings should be cleaned. The bracket cavity should be repacked with 2S-3230 Grease. Pack the bearings (one-third to one-half of the cavity volume). Refer to Table 1.

    To reinstall bearings, heat the bearings to 107 °C (224.6 °F) for 10 minutes. Mount the bearings on the shaft. To reinstall the hub, heat the hub to 400 °C (752.0 °F) for 3 hours. Mount the hub to the shaft.

  1. Ensure that the grease supply tube to the bearing is filled with grease.

  1. Remove the bracket drain plug and operate the generator for 1 hour. This interval allows the grease to expand. The expanding grease will force the excess grease from the cavity. When the excess grease is forced from the cavity, the internal pressure will be reduced. The generator should continue to operate until the grease stops purging.

  1. Stop the engine. Install the bracket drain plug. Wipe off the excess grease.

  1. For greasing intervals, follow the recommendations on the lubrication plate (if equipped) or refer to Maintenance Schedule, "Bearing - Lubricate". Whenever the bearings are greased, repeat Step 5. DO NOT MIX GREASES.

Table 1
Bearing Outside Diameter
mm (inch)    
Bearing Inside Diameter
mm (inch)    
Part Number     Generator Frame Size     Bearing Bore in Bracket
mm (inch)    
Bearing Shield (Type)     Bearing Cavity Grease
mL (oz.)    
Rotor Shaft Diameter
mm (inch)    

100 mm (3.9370 inch)    

45 mm (1.7717 inch)    
5P-1977     All 360    
100.000 mm (3.9370 inch) to

100.025 mm (3.9380 inch)    
Double     29.6 mL
(1 oz.)    

45.004 mm (1.7718 inch) to

45.019 mm (1.7724 inch)    

140 mm (5.5118 inch)    

65 mm (2.5591 inch)    
3N-1965     440 (round laminated)    
140.002 mm (5.5119 inch) to

140.028 mm (5.5129 inch)    
Double    
53.280 mL (1.8 oz.) (1)

94.720 mL (3.2 oz.) (2)    

65.004 mm (2.5592 inch) to

65.021 mm (2.5599 inch)    

160 mm (6.2992 inch)    

75 mm (2.9527 inch)    
5P-2448     580 (2)
590 (1)    

160.002 mm (6.2993 inch) to

160.028 mm (6.3003 inch)    
Double    
100.64 mL (3.4 oz.)
to

168.72 mL (5.7 oz.)    

75.004 mm (2.9529 inch) to

75.021 mm (2.9536 inch)    

170 mm (6.6929 inch)    

80 mm (3.1496 inch)    
4L-6677 (3)     580 (1)    
170.002 mm (6.6930 inch) to

170.028 mm (6.6940 inch)    
Single    
97.68 mL (3.3 oz.)
to

162.80 mL (5.5 oz.)    

80.002 mm (3.1497 inch)
to

80.020 mm (3.1504 inch)    

170 mm (6.6929 inch)    

80 mm (3.1496 inch)    
109-7687 (3)     580 (1)    
170.002 mm (6.6930 inch) to

170.028 mm (6.6940 inch)    
Double    
97.68 mL (3.3 oz.)
to

162.80 mL (5.5 oz.)    

80.002 mm (3.1497 inch) to

80.020 mm (3.1504 inch)    

180 mm (7.0866 inch)    

100 mm (3.9370 inch)    
6Y-3955     440 (square laminated)    
179.992 mm (7.0863 inch) to

180.017 mm (7.0873 inch)    
Double    
139.12 mL (4.7 oz.)
to

230.88 mL (7.8 oz.)    

82.474 mm (3.2470 inch) to

82.486 mm (3.2475 inch)    

190 mm (7.4803 inch)    

90 mm (3.5433 inch)    
6Y-6488     590 (1)
589 PM    

190.002 mm (7.4804 inch) to

190.028 mm (7.4814 inch)    
Double    
97.68 mL (3.3 oz.)
to

162.80 mL (5.5 oz.)    

90.012 mm (3.5438 inch) to

90.028 mm (3.5444 inch)    

225 mm (8.8582 inch)    

105 mm (4.1338 inch)    
6V-0410     680 (1)    
225.003 mm (8.8584 inch) to

225.034 mm (8.8596 inch)    
Single    
139.12 mL (4.7 oz.)
to

230.88 mL (7.8 oz.)    

105.029 mm (4.1350 inch) to

105.034 mm (4.1352 inch)    

225 mm (8.8582 inch)    

105 mm (4.1338 inch)    
108-1760     680 (1)    
225.003 mm (8.8584 inch) to

225.034 mm (8.8596 inch)    
Double    
148.00 mL (5.0 oz.)
to

236.80 mL (8.0 oz.)    

105.029 mm (4.1350 inch) to

105.034 mm (4.1352 inch)    

230 mm (9.0551 inch)    

130 mm (5.1181 inch)    
2L-4444 (4)     808
four pole (1)    

229.992 mm (9.0548 inch) to

230.022 mm (9.0560 inch)    
Open    
177.60 mL (6.0 oz.)
to

266.40 mL (9.0 oz.)    

130.028 mm (5.1192 inch) to

130.051 mm (5.1201 inch)    

230 mm (9.0551 inch)    

130 mm (5.1181 inch)    
2L-4444 (4)     820 (1)    
229.992 mm (9.0548 inch) to

230.022 mm (9.0560 inch)    
Open    
236.8 mL (8.0 oz.)
to

355.20 mL (12.0 oz.)    

130.028 mm (5.1192 inch) to

130.051 mm (5.1201 inch)    

240 mm (9.4488 inch)    

110 mm (4.3307 inch)    
108-1761     690 (1)    
240.002 mm (9.4489 inch) to

240.033 mm (9.4501 inch)    
Double    
207.20 mL (7.0 oz.)
to

296.00 mL (10.0 oz.) (5)

414.40 mL (14.0 oz.)
to

621.60 mL (21 oz.) (6)    

110.012 mm (4.3312 inch) to

110.028 mm (4.3318 inch)    

240 mm (9.4488 inch)    

110 mm (4.3307 inch)    
6V-3310     800 (1)    
240.002 mm (9.4489 inch) to

240.033 mm (9.4501 inch)    
Single    
145.04 mL (4.9 oz.)
to

239.76 mL (8.1 oz.)    

110.012 mm (4.3312 inch) to

110.028 mm (4.3318 inch)    

240 mm (9.4488 inch)    

110 mm (4.3307 inch)    
6V-6752     800 (1)    
240.002 mm (9.4489 inch) to

240.033 mm (9.4501 inch)    
Single    
145.04 mL (4.9 oz.)
to

239.76 mL (8.1 oz.)    

110.012 mm (4.3312 inch) to

110.028 mm (4.3318 inch)    

240 mm (9.4488 inch)    

110 mm (4.3307 inch)    
108-1761     800 (1)    
240.002 mm (9.4489 inch) to

240.033 mm (9.4501 inch)    
Double    
148.00 mL (5.0 oz.)
to

236.80 mL (8.0 oz.)    

110.012 mm (4.3312 inch) to

110.028 mm (4.3318 inch)    

280 mm (11.024 inch)    

130 mm (5.1181 inch)    
154-3032     820    
280.002 mm (11.0237 inch)
to

280.032 mm (11.0249 inch)    
Double     N/A    
130.028 mm (5.1192 inch) to

130.051 mm (5.1201 inch)    
( 1 ) Inboard bearing
( 2 ) Outboard bearing
( 3 ) 109-7687 bearing is preferred.
( 4 ) This bearing is a spherical roller bearing. This bearing is greased from the front side of the bracket. All of the other bearings are ball bearings.
( 5 ) Bearing on exciter end.
( 6 ) Bearing on drive end.

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