HOSE AS 2949055 - Caterpillar

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
  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