TANK AS-AIR 8J2969 - Caterpillar

2. Release brake (9) for Hz adjustment knob (10). Turn knob (10) counterclockwise (CCW) (as seen from the top as shown) until it stops. This will ensure that the signal generator/counter is at the low end of its range.Check of rpm Settings (Set Point) for Electronic Speed Switch
1. Use 4C6534 Speed Switch Calibration Harness (1) to connect 8T5201 Signal Generator/Counter (3) to the electronic speed switch (6) that is to be checked and or calibrated.Refer to the topic entitled Using the 4C6534 Speed Switch Calibration Harness to Connect 8T5201 Signal Generator/Counter to an Electronic Speed Switch in this instruction.2. Push ON switch (12) to turn on power to signal generator/counter (3), then push HI switch (13). Approximately 7 Hz will appear on LCD display (14). If the overspeed switch activates, push reset button (15) to reset the switch. 3. Remove sealing screw (16) from the hole for the oil step switch.4. Connect a Caterpillar® Digital Multimeter (DMM) to crank termination (CRANK TERM) terminals 10 and 11 (17) on the electronic speed switch. Set the DMM at the 200 Volt DC range. When getting near the desired set point, turn the Hz adjustment slowly. This is because it is quite easy to overshoot (go past) the specified set point frequency.5. Using the Hz adjustment knob on the signal generator/counter, slowly increase the frequency until the DMM display switches to 0 Volts.Stop increasing the Hz frequency and record the reading shown on the