The Hitch Wire Harnesses Need To Be Rerouted, Inspected, And Better Secured On Certain 621F, 623F, And 627F Wheel Tractors Caterpillar

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.

NOTE: This Program must be administered as soon as possible. When reporting the repair, use "PI3779" as the Part Number, "7751" as the Group Number, "56" as the Warranty Claim Description Code and "T" as the SIMS Description Code. Exception: If the repair is done after failure, use "PI3779" as the Part Number, "7751" as the Group Number, "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.

Completion Date

Termination Date

Problem

The routing and clipping of the hitch harnesses may not provide adequate retention of the harnesses on certain 621F, 623F, and 627F Wheel Tractors. The length of harness between the retaining clips may not be long enough and the clips may separate and allow movement between the clips and harnesses.

Affected Product
Model & Identification Number

621F (05A10224-10225, 05A10254, 05A10330, 05A10337-10340, 05A10383, 05A10397, 05A10423-10425, 05A10439, 05A10450, 05A10503-10504, 4SK1-43 , 4SK46-70, 4SK72-85, 4SK88-93, 4SK96-102, 4SK104-106, 4SK108-142, 4SK146-166, 4SK168, 4SK170, 4SK172-187, 4SK189, 4SK191-207)

623F (6BK1-152)

627F (1DL1-140)

NOTE: 05A10224, 10225, 10254, 10330, 10337-10340, 10383, 10397, 10423-10425, 10439, 10450, 10503, 10504 may not be equipped with the 8X9712 Wiring Harness. If the Affected Product is not equipped with both harnesses, follow the rework procedure as applicable to insure that there is the proper amount of slack in the existing harnesses and that they are not damaged.

Parts Needed

Dealers will need to order parts for this Program.

1 - 9B7237 Bolt

6 - 9M7958 Clamp-Hose

2 - 9M8406 Clip

3 - 5P7468 Clip

3 - 5P7469 Clip

3 - 5P8444 Grommet

1 - 8T4896 Washer

1 - 1012746 Guard

Action Required

See the attached procedure and the note under the heading Affected Product.

Owner Notification

U.S. and Canadian owners will receive the attached Owner Notification.

Service Claim Allowances

NOTE: This is a 2-hour job.

NOTE: U.S. and Canadian Dealers Only - Eligible dealers may enter a Type 2 SIMS Report.

Parts Disposition

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

NOTE: MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.

Attach.

(1-Owner Notification)

(2-Rework Procedure)

Copy Of Owner Notification For U.S. And Canadian Owners

Rework Procedure

101-3304 Harness Assembly

1. Remove the existing clip at point "C".

2. Inspect harness for damage to the connectors, insulation, or wires.

3. If the harness is damaged, repair as per harness repair instructions.

4. Clip (secure) the harness at point "B" using a 9M8406 Clip. Allow 260 ± 10 mm slack between connection "A" and point "B".

5. Fasten clip "B" to the boss located on the right hitch stop on top of the case using a 9B7237 Bolt and 8T4896 Washer.

6. Clip harness at point "C" using a 9M8406 Clip. Allow 400 ± 10 mm slack between points "B" and "C".

8X9712 Harness Assembly

1. Remove existing clips at points "D", "E", and "F".

2. Inspect harness for damage to insulation or wires and repair as per harness repair instructions.

3. Place 101-2746 Guard over harness, starting at 620 ± 10 mm from point "H".

4. Secure guard to harness using (6) 9M7958 Clamps.

5. Use (3) 5P7468 Clips, (3) 5P7469 Clips, and (3) 5P8444 Grommets to clip harness at points "D", "E", and "F".

6. Allow slack of 580 ± 10 mm from points "D" to "E", 610 ± 10 mm from points "E" to "F", and 680 ± 10 mm from points "F" to "G".

Harness Repair Instructions

...If only outer insulation of harness is damaged, tape the damaged area with 1P0810 Tape.

...If the wire insulation is damaged and the wire is not broken, tape the bare wire with 1P0810 Tape.

...If the wire is broken, solder the wires back together. First, put a piece of 5P6001 Tubing (Shrink) over the wire. After soldering, shrink the tubing over the connection. The 1P0810 Tape can also be used. If wire needs to be added, use 5P5623 Wire (16 awg), 5P5624 Wire (14 awg), or 5P5621 Wire (12 awg).

NOTE: See the February 28, 1994 Service Magazine Article for additional soldering information.

Illustration 1