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Effective
09/2005
CHAPTER 3
CHECKOUT, CALIBRATION AND MAINTENANCE
SHAFT IMBALANCE, WHEEL ADAPTER TO SHAFT REMOUNT TEST
This test proves the wheel balancer centering device is balanced, turns true and proves the centering device inside
taper and balancer shaft outside taper (mating surfaces) are true.
1.
Mount a medium size wheel assembly (14”), input the rim dimensions and balance the wheel assembly to
0.00 ounces imbalance in both planes. This must be balanced to exactly 0.00 in both planes.
2.
Spin the balancer several times. Verify that no more than 0.05 oz. imbalance is displayed.
3.
Loosen the Speed nut and rotate the tire and wheel assembly 180 degrees, making sure the cone does not
rotate.
NOTE: DO NOT REMOVE THE WHEEL ASSEMBLY.
4.
Operate the balancer. The new imbalance displayed should not exceed 0.25 oz.
TEST PRODUCES READINGS OUT OF TOLERANCE:
5.
Remove the tire and wheel assembly from the balancer.
6.
Check the tapered surfaces of the basic centering device and balancer shaft. They should be clean and
smooth. Clean and retest. If the test still produces unacceptable results:
7.
Using a dial indicator, measure runout of the balancer shaft tapered mounting surface. Acceptable tolerance
is 0.0015" T.I.R. (Total Indicated Runout). If the surface measures out of tolerance, replace the vibratory
system.
8.
Perform a P80 and a P83 using the Pruefrotor and retest. These test can be found later in this Chapter.
BALANCER DIAGNOSTICS (TROUBLESHOOTING)
Many problems may be found by process of elimination. By determining the problem, then eliminating potential
problem areas starting with the
most-likely to fail
items, solutions to problems may be rapidly found. The Hand
Spin balancer is composed of subsystems, each requiring several inputs for proper function. With proper inputs
the subsystem performs as expected and produces an output. Every piece of equipment, when operable,
operates in a predetermined manner. Events have to take place in the proper sequence every time. A balancer
must:
Be supplied with correct power and ground.
Give a display output.
Accept Keypad input.
Process commands through the Computer.
Receive and process encoder/transducer inputs.
Brake
Display proper weight amount and location.
in that order every time, in order to balance tires. The technician should watch a machine work and make
performance assessments based on what is seen. If subsystem failure is suspected, use diagnostic tests to
confirm the failure. Remember, every part requires input to produce the expected output. These outputs in turn
become inputs for further use by the system.