John Bean VPI SYSTEM II, Operation Instructions Manual

Page 16

5.0 TIRE MATCHING PROGRAM - F90

Tire matching assists the user in determining the best
possible mating of the tire and rim. The mating of tire
and wheel normally allows the least amount of additional
weight required for balancing and total runout.

The matching program is helpful when:

•

Excessive radial runout is noticed.

•

The balancer calls for weights in excess of 2 oz. on
either plane in the 

Dynamic

 mode.

The 

VPI System III

 computer wheel balancer features a

matching program capable of two levels of resolution:

Dynamic

, to rotate 

and 

reverse the tire on the rim for

optimum rim and tire matching.

Static

, when the tire has an ornate sidewall or direc-

tional tread and cannot be reversed on the rim.

INSTRUCTIONS:

1. Press  the "

F

" button followed by rotating the shaft

until the display. reads "

F

"  “

90

”, release the "F"

button.

When activated the machine displays "

--- ACH---

" for

one second followed by "

PUT VAL  tOP

". This instructs

the operator to rotate the wheel so the inflation valve is
at 12 o'clock. See 

Figure 

26.  Press "F" to store the

valve position, the display will then read "

ACH SPN 1

 ".

NOTE

: THE F BUTTON CAN BE PRESSED MORE

THAN ONCE, EVERY TIME THE F BUTTON IS
PRESSED, THE VALVE POSITION IS REMEMBERED
BY MACHINE AS A REFERENCE POINT.

2. Lower the wheel guard to spin the wheel, when the
shaft reaches the balancing speed, the display reads  "

-

-- ACH --- 

" accompanied with a short beep.

3. After spinning the shaft brake engages and the dis-
play reads "

tur tir---

" and "

CrS tOP---

" alternatively.

(1) The operator should turn the wheel and mark an  X at
the 12 o'clock when the valve is at the 6 o'clock position.

Figure 

27

(2) Remove the wheel assembly from the balancer and
deflate and rotate the tire on the rim so the valve points
to the cross mark on tire as shown in 

Figure 

28

4. After inflating the tire and remounting on shaft, press
F Button. The machine displays "

PUT VAL  tOP

" again.

Operator should turn the wheel so the valve is at 12
o'clock. Press the "F" button to program the valve posi-
tion.

Figure 26 - Step 1, valve top, press "F"

Figure 27 - Step 2, valve at bottom,
mark top of tire with X, press "F"

Figure 28 -  Step 3, rotate tire on wheel so the valve and
X mark line up.  Rotate assembly to TDC, press "F".