BUCKET AR 1247014 - Caterpillar

Waveform Time Relationships (enlarged scale)
VOLTAGES MAY VARY 10%, PULSE DURATIONS BY 20% EXCEPT 83.3 ?s AND 2.66 ms WHICH ARE EXACT BASED ON A 12.000 kHZ OSCILLATOR. (1C202) SIGNAL SOURCE IS INTERNAL CALIBRATOR. ALL TEST POINTS REFERENCED TO TP1.Disassembly Procedure
1 Remove six screws (1) from front panel (2), and remove panel (2) from case (3). Remove four screws (4) from the PC board, and also remove the locknuts from the two front panel switches (5) and (6). Carefully lift front panel (2) from PC (printed circuit) board (7).Calibration Procedure
To make sure the 6V3100 Timing Indicator Group (1) has good accuracy, check its calibration at a minimum of every six months. Also, the timing indicator will need calibration if: A. It does not show 2000 30 R/MIN at (A) and 32.0 .2 DEG at (B), when the CALIBRATION CHECK-OPERATE Switch (C) is