CONTROL AR-AUXILIARY 1461483 - Caterpillar

(8PB1-5835, 7PK1-87, 9GJ1-673, 4NK) D4H DD (2AC1-5557) D4H XL (8PJ1-331) D4H TSK (8ZF1-55) D5H (3MD1-5566, 4KD1-5553, 1YD1-5520, 2SD1-5534) D5H TSK (7EG1-1064) D6H (2KD1-5587, 1KD1-5564, 3ED, 8FC1-559, 4YF1-5557, 4GG1-5569, 2DK) D6H XL (9RK, 8SK1-357) D6H XR (7ZK, 2TL) D7G (65V1-7781) D7H (4AB, 5WB, 2RG, 3XG) Track Type Tractors 571G (5ZD1-276) 572G (8PC1-473) Pipelayers3W-5211, 3W-5541 or 9P-4608 Backup Alarm Switches may stick closed. If the backup alarm switch sticks closed, the backup alarm will SOUND even though the machine transmission is not in reverse. 3T-1815 Backup Alarms with the letters "YEC" stamped in the lower right corner, may be causing the backup alarm switch to stick closed. If the machine is equipped with one of these alarms, replace the alarm with a new 3T-1815 Backup Alarm that does not have the letters "YEC" stamped in the lower right corner. There are no 3T-1815 Backup Alarms with "YEC" in the parts system. The backup alarm switch must also be replaced. If the backup alarm does not have the letters "YEC" stamped in the lower right corner, the backup alarm is not the cause of the sticking backup alarm switch. The backup alarm switch should be adjusted. See the machine Service Manual for proper backup alarm switch adjustment procedures.
Effective with the following serial numbers, backup alarms with "YEC" in the lower right corner are no longer used: D4H (2AC5558, 7PK88, 8PB5836, 8PJ332, 8ZF56, 9GJ674); D5H (1YD5521, 3MD5567, 7EG1065, 2SD5535, 2KD5588, 4KD5554); D6H (1KD5565, 4GG5570, 4YF5558, 8SK358), D7G (65V7782); 571G (5ZD277); 572G (8PC474).