2008/06/02 Caterpillar

The Outer Bolts in the Swing Bearing May Become Loose, Broken, or Incorrectly Torqued {7051, 7063}

Usage:

CIPI 0EM

Excavator: 365B (S/N: CTY1-UP; 9PZ1-UP) 365BLSeries II (S/N: JMB1-UP; PEG1-UP; SDL1-UP; DER1-UP; 9TZ1-UP) 365C (S/N: ELC1-UP; GWC1-UP; MEM1-UP; 0EM1-UP; FEN1-UP; PAR1-UP; MCS1-UP; MCY1-UP)
OEM: 365C L OEM (S/N: GSZ1-UP)

Service Magazine SEPD0987, 13 April 2009, "The Outer Bolts in the Swing Bearing May Become Loose, Broken, or Incorrectly Torqued". Disregard this article. See the article that follows.

ReferenceRefer to Disassembly and Assembly Manual, RENR8616, "Upper Frame and Undercarriage Frame" for additional information.

The 179-2203 Bolts in the swing bearing may fail prematurely. The bolts may also back out. The bolts may break. The failed bolts may cause additional damage on the swing gear and on the frame if the bolts are not replaced in a timely manner.

The 171-9325 Bolts in the swing bearing holding the swing gear bearing on the upper structure may loosen. The loosening may occur at around 250 hours.

If the bolts are loose, replace the existing bolts with new bolts and new spacers. New bolts must be furnished. See Table 1 for the replacement parts.

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Table 1
Item	Qty	New Pt. No.	Part Name
1	37	171-9325	Bolt
2	37	199-4501	Spacer

Use the following procedure for the repair of the broken bolts in the swing bearing. Refer to Table 2 for the effectivity and adaptability of the machines.

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Table 2
Affected Machines		Effective Machines
Model	Serial Number Range	Serial Number Range
365B L	S/N:9PZ1-UP
365B L	S/N:9TZ1-UP
365B L MH	S/N:CTY1-UP
365B L Series II	S/N:JMB1-UP
365B L Series II	S/N:DER1-UP
365B L MH Series II	S/N:SDL1-UP
365B L FS Series II	S/N:PEG1-UP
365C L	S/N:ELC355-481	S/N:ELC482-567
	S/N:MEM1-274
	S/N:FEN1-144,145-148	S/N:FEN149-UP
	S/N:MCS1-445	S/N:MCS503-UP
	S/N:MCY1-427	S/N:MCY479-541
365C L MH	S/N:GWC1-228
365C L FS	S/N:PAR1-267	S/N:PAR273-UP
365C L MHPU	S/N:GSZ101-103,116-138,	S/N:GSZ317-UP
CIPI	S/N:05A12755, S/N:05A12830 S/N:05A13032, S/N:05A13036 S/N:05A13078, S/N:05A13178 S/N:05A13186-13187 S/N:05A13215, S/N:05A13604 S/N:0EM281-282 S/N:0EM506 S/N:0EM523 S/N:0EM536 S/N:0EM648 S/N:0EM680 S/N:0EM687 S/N:0EM746 S/N:0EM924 S/N:0EM998 S/N:0EM1003 S/N:0EM1023 S/N:0EM1027 S/N:0EM1056 S/N:0EM1110 S/N:0EM1112 S/N:0EM1143 S/N:0EM1149 S/N:0EM1166 S/N:0EM1265 S/N:0EM1270-1271 S/N:0EM1312-1313 S/N:0EM1397 S/N:0EM1403 S/N:0EM1417 S/N:0EM1479 S/N:0EM1674-1675 S/N:0EM1682 S/N:0EM1841 S/N:0EM1960-1961 S/N:0EM1972-1973

Repair Procedure

The bolts should be tightened to a torque of 900 N·m (664 lb ft) and then torque-turned an additional 60 degrees. This additional torque will bring the total torque to 2100 ± 100 N·m (1549 ± 74 lb ft)

Check the torque for all of the bolts. Make sure that the bolts are torqued to 2100 ± 100 N·m (1549 ± 74 lb ft) or greater.
1. Make sure that the torque wrench is set to the proper torque value.
1. Make a mark on the head of the bolt that is relative to the carbody or the bearing race.
1. Tighten the bolt to a torque of 2100 ± 100 N·m (1549± 74 lb ft).
1. If the head of the bolt moves, the bolt was loose. Refer to the Disassembly and Assembly Manual for the correct procedure on checking the torque and the proper tools needed.

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Illustration 1	g02173566
(1) 171-9325 Bolt (2) 199-4501 Spacer

If a bolt is loose or a bolt is broken, replace the 37 former bolts with new 171-9325 Bolts (1). Install new 199-4501 Spacers (2) with the bolts. Clean all of the components. Apply 5P-3931 Anti-Seize Compound on the threads of the bolts. Tighten the bolts to a torque of 2100 ± 200 N·m (1540 ± 150 lb ft).