PRODUCT SUPPORT PROGRAM FOR UPDATING THE SAW DRIVE SHAFT TO PREVENT VIBRATION OR BREAKAGE ON CERTAIN HF181, HF201, HF202, HF221 AND HF222 FELLING HEADS

Usage:

SEBE9057

February 9, 2005
U-38
A-28
D-32

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*before or* *after failure*	PRODUCT SUPPORT PROGRAM FOR UPDATING THE SAW DRIVE SHAFT TO PREVENT VIBRATION OR BREAKAGE ON CERTAIN HF181, HF201, HF202, HF221 AND HF222 FELLING HEADS
5237		PS41529

NOTE: This Program can be administered either before or after failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS41529" as the Part number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

NOTE: The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.

TERMINATION DATE

February 28, 2007

PROBLEM

The saw drive shaft assembly needs to be replaced on certain HF181, HF201, HF202, HF221 and HF222 Felling Heads. The bearings may spin on the saw drive shaft causing excessive endplay of the saw disc, or the drive shaft may crack. These failure modes will lead to vibration and/or saw drive shaft breakage. An improved design saw drive shaft assembly is available for installation on felling heads to prevent damage to the saw.

AFFECTED PRODUCT

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Model	Identification Number
HF181	CFG129-140, 279-285
HF181	ECB120-122
HF201	CKL206-255, 257-258, 356-376
HF201	DCG130-133
HF202	HFH117-119, 267-268
HF202	FCZ110, 111
HF221	BAL99-127, 250-258
HF221	CDZ103-145, 147
HF222	CFR199-216, 350-351

PARTS NEEDED

1 ? 8A5878 Roller Bearing Cone

1 ? 4B8394 Roller Bearing Cup

12 ? 2N1746 Socket Head Bolts

4 ? 8T3957 Socket Head Bolts

1 ? 9X4620 Lip Type Seal

1 ? 0067124 Roller Bearing Cup

1 ? 0067125 Roller Bearing Cone

1 ? 2354144 Locknut

1 - 2625582 Drive Shaft (Saw)

ACTION REQUIRED

See the attached rework procedure.

SERVICE CLAIM ALLOWANCES

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Product smu/age whichever comes first	Caterpillar		Dealer Suggested		Customer Suggested
Product smu/age whichever comes first	Parts	Labor Hrs	Parts	Labor Hrs	Parts	Labor Hrs
0-4000 / 0-24 months	100%	8	0	0	0	0
4001-6000 / 25-36 months	33 1/3%	4	0	0	50%	4
NOTE: This is an 8?hour job.

PARTS DISPOSITION

Handle the parts in accordance with your Warranty Bulletin or warranty parts handling.

Attach. (1-Rework Procedure)

Rework Procedure

Remove the disc saw. Refer to RENR3034, RENR4371, RENR6118 or RENR6244, Disassembly & Assembly, Machine Systems, "Disc Saw ? Remove", for the procedure for the head being serviced.
Remove the piston motor from the saw drive shaft. Refer to RENR3034, RENR4371, RENR6118 or RENR6244, Disassembly & Assembly, Machine Systems, "Piston Motor (Disc Saw) ? Remove", for the procedure for the head being serviced.

Illustration 1 ? Saw drive shaft Assembly

Remove the saw drive shaft from the head. Refer to RENR3034, RENR4371, RENR6118 or RENR6244, Disassembly & Assembly, Machine Systems, "Output Shaft ? Remove", for the procedure for the head being serviced. Note that the spacer ring, item 12 in Illustration 1 above, does not need to be removed.
Install the new saw drive shaft. Replace the components listed in the table below. The item numbers are shown in Illustration 1 above. Use the following service manual references and instructions.

RENR4371, RENR6118 or RENR6244, Disassembly & Assembly, Machine Systems, "Output Shaft ? Install"
RENR4370, RENR6115, RENR6137 or RENR6343, Specifications, "Output Shaft" for the head being serviced.

NOTE: The spacer ring, item 12 in Illustration 1 above, does not need to be installed since it is pre-installed with the new saw drive shaft.

NOTE: The saw disc retainer plate (item 14) should be cleaned thoroughly on the surfaces where the retainer bolts (item 13) contact the plate. This cleaning ensures that the clamping force is reached when the bolts are torqued to the specification in the service manual.

Replace the following components during the installation of the new saw shaft. The item numbers are listed in Illustration 1 above.

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Item #	Description
7	2625582 Drive Shaft - Saw (replaces former drive shafts 2354141 and 1850117)
3	2354144 Locknut replaces the former locknut
9	0067124 Roller Bearing Cup
10	0067125 Roller Bearing Cone
2	9X4620 Lip Type Seal
5	4B8394 Roller Bearing Cup
6	8A5878 Roller Bearing Cone
1	8T3957 Socket Head Bolts (quantity of 4)
13	2N1746 Socket Head Bolts (quantity of 12)