After balancing tire after tire, sooner or later, any tire machine is going to lose its calibration. To save money for your garage that you would spend calling in a machine technician, you can perform the calibration process yourself with items you have in your own shop.
Instructions
1. Mount a standard 14-by-6-inch steel rim and tire onto the arbor of the Coats balance machine. If there are any weights on the rim, remove them before starting the calibration process.
2. Using the control knobs on the front panel, enter the rim width, distance and tire size into the machine.
3. Using the Fine Balance option on the machine, and holding down the Start button the entire time, balance the tire until 0.00 weight has been achieved on both sides.
4. Using the control knobs on the front of the machine, adjust the rim size to read 10.5. If there is any other reading on the display, repeat the previous step in Fine Balance.
5. Once the wheel is zeroed out on the machine readings, return the rim size to 14 inches.
6. Using the wheel-weight hammer, pound on a 4.0-oz. weight on the outside rim and spin the tire. The reading should be no more than .1 oz. in either direction.
7. If the calibrating process has been performed properly for the outside of the rim, the green indicator light for the outside edge of the rim will illuminate when the 4.0-oz. weight is in the 6:00 position on the arbor of the balancer.
8. Remove the 4.0-oz. weight from the outside edge and repeat the procedure on the inside rim. Due to interference, .2 oz. of difference may be seen on the opposite side of the rim you're calibrating. This is normal.
Tips Warnings
If the machine fails to calibrate, a more in-depth adjustment procedure may be necessary. Having the machine bolted to the floor will also help prevent it from being knocked out of calibration.
Tags: calibrate, coats, tire, balancer, 0-oz weight, calibration process, control knobs, control knobs front, Fine Balance, knobs front
