KYMCO MXU 500 - Front Drive Shim Asjustment

13. DRIVE TRAIN
13-32
MXU 500
FRONT DRIVE SHIM
ADJUSTMENT
BACKLASH
Install the removed left and right side shims
and front drive assembly.
Assemble the gear case (refer to the
“FRONT DRIVE
DISASSEMBLY/INSPECTION/
ASSEMBLY” section in this chapter).
Remove the oil filler cap and measure the
backlash of the drive ring gear using the
horizontal type dial gauge and proper size
of wooden piece or plastic piece, as shown.
Take backlash readings at three places while
turning the ring gear slightly in each
direction and securely holding the pinion
gear by using commercially tool.
Read the total backlash on the dial gauge.
Remove the dial gauge and turn the ring
gear 120°, then measure the backlash.
Repeat this procedure once more and
compare the difference of the three
measurements.
If the backlash is not within specification,
the shim must be changed and the backlash
should be re-checked until correct.
Refer to the chart at the right for the
appropriate shim thickness.
Stand backlash:
0.05 – 0.1 mm (0.002 – 0.004 in)
At this time, it is not necessary to apply
a sealant to the mating surface of the
g
ear case.
＊
Adjust the backlash by referring to the
chart at the right and using the thickness
of the removed shims as a guide.
Backlash Shim ad
j
ustment
Under 0.05 mm
(0.002 in)
Increase shim
thickness
0.05 – 0.1 mm
(
0.002 – 0.004 mm
)
Correct
Over 0.1 mm
(0.004 in)
Decrease shim
thickness
＊
Shim thickness
0.7 mm (0.0276 in)
0.75 mm (0.0295 in)
0.8 mm (0.0315 in)
0.85 mm (0.0335 in)
0.9 mm (0.0354 in)
0.95 mm (0.0374 in)
1 mm (0.0394 in)
1.05 (0.0413 in)
1.1 mm (0.0433 in)
1.15 mm (0.0453 in)
1.2 mm (0.0472 in)
1.25 mm (0.0492 in)
1.3 mm (0.0512 in)
1.35 mm (0.0531 in)
1.4 mm (0.0551 in)
1.45 mm (0.0571 in)
Pinion Gear Wooden Piece or Plastic piece