PRIORITY - GROUND WIRES ON CERTAIN D6H, D7H, AND D8N TRACTORS EQUIPPED WITH ROOF MOUNTED AIR CONDITIONER CONDENSERS NEED TO BE CHECKED FOR CORRECT GROUND WIRE INSTALLATION - PI3521 - MAILED US AND CANADA, LIMITED CACO Caterpillar

PRIORITY - GROUND WIRES ON CERTAIN D6H, D7H, AND D8N TRACTORS EQUIPPED WITH ROOF MOUNTED AIR CONDITIONER CONDENSERS NEED TO BE CHECKED FOR CORRECT GROUND WIRE INSTALLATION - PI3521 - MAILED US AND CANADA, LIMITED CACO

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Caterpillar: Confidential Yellow

PRIORITY - GROUND WIRES ON CERTAIN D6H, D7H, AND D8N TRACTORS EQUIPPED WITH ROOF MOUNTED AIR CONDITIONER CONDENSERS NEED TO BE CHECKED FOR CORRECT GROUND WIRE INSTALLATION - PI3521 - MAILED US AND CANADA, LIMITED CACO

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.


U-47
A-37.1
PRIORITY
1408  PI3521
COMPLETION DATE

Termination Date

September 30, 1991  March 31, 1992

Problem

The 1Q1971 Wire Assembly that connects the 3T2170 Relay to a terminal on the
9F3099 Start Relay may not have been properly connected on certain D6H, D7H,
and D8N Tractors. See Illustration 1.

Affected Product

Model Identification Number
D6H 4RC4083, 4093, 4094
6FC4031, 4053
3ZF1401, 1448, 4017, 4050, 4089, 4111, 4128
3YG565, 566, 584, 4090, 4105, 4157
D7H 5BF843, 847, 885, 909, 4036, 4042, 4106, 4115
4FG337, 4086
79Z2359, 2369, 4087, 4105, 4124, 4139, 4160
80Z802
D8N 9TC2864, 2876, 2900, 2906, 2938, 2949, 3182, 3194,
3270, 3300, 3316, 3326, 3336, 3376, 3406, 3415,
3424, 3501, 3505, 3600, 3607, 3643, 3665, 3740,
3747, 3769, 3773, 3779, 3787, 3808, 3857, 3863,
3867, 3907, 3914, 3919, 3927, 3937, 3943, 4025,
4033, 4070, 4081, 4115, 4164, 4199, 4212, 4250,
4253, 4266, 4267, 4334, 4336, 4415, 4424, 4434,
4484, 4570, 4580, 4581, 4587, 4603, 4612, 4658,
4661, 4670, 4677, 4688, 4695, 4778, 4783, 4806

Parts Needed

Not Applicable

Action Required

Remove the 1Q1971 Wire Assembly from the starter relay terminal to which the
306 green wire is attached and connect it to the terminal with the other
black wires. See Illustration 2.
****** IMAGE: SEBE4539.00001.001
CAPTION: Illustration 1
Mounting and Condenser Gp.
Typical D6H, D7H, D8N
****** IMAGE: SEBE4539.00001.002
CAPTION: Illustration 2
Wiring Schematic

Owner Notification

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

Service Claim Allowances

Caterpillar Dealer Suggested Customer Suggested
Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
100% 1  0 0 0 0
NOTE: This is a 1-hour job.

Parts Disposition

Any parts removed (with the exception of cores used for Caterpillar
Remanufactured parts) can be rendered useless and scrapped immediately upon
completion of the repair.
MAKE EVERY EFFORT TO COMPLETE THIS PROGRAM AS SOON AS POSSIBLE.
Attach. (1-Owner Notification)
COPY OF

Owner Notification

 FOR U.S. AND CANADIAN OWNERS
XYZ Corporation
3240 Arrow Drive
Anywhere, YZ 99999
PRIORITY - Ground Wires On Certain D6H, D7H, And D8N Tractors Equipped With
Roof Mounted Air Conditioner Condensers Need To Be Checked For
Correct Ground Wire Installation
MODELS INVOLVED - D6H, D7H And D8N Tractors
Dear Caterpillar Product Owner:
The wire assembly that connects the relay to a terminal on the start relay
may not have been properly connected on the products listed below. The
repair will be done at no cost to you.
Contact your local Caterpillar dealer immediately and schedule a time to have
this service performed. The repair time for this service is approximately
one hour.
We regret the inconvenience this may cause you, but urge you to have this
service performed as soon as possible to prevent unscheduled downtime.
Caterpillar Inc.
Identification #(s)
Attached to March 17, 1991 Service Letter