6-77
E
LOWR
SHIMMING (COUNTER ROTATION MODELS)
(FOR USA AND CANADA)
Measuring steps
(1) Calculate the specified value (M0).
NOTE:
• “R” is the deviation of the lower case
dimension from standard. It is stamped
on the trim tab mounting surface of the
lower case in 0.01-mm units. If the “R”
mark is missing or unreadable, assume an
“R” value of “0”, and check the backlash
when the unit is assembled.
• If the “R” mark is negative (–), then add
the “R” value to the measurement.
Example:
If “R” is “+5”, then
M0 = 1.30 – (+5)/100 mm
= 1.30 – 0.05 mm
= 1.25 mm
If “R” is “–3”, then
M0 = 1.30 – (–3)/100 mm
= 1.30 + 0.03 mm
= 1.33 mm
6550
(2) Install the shimming gauge, bearing,
thrust washer, forward gear, and
shim(s).
NOTE:
• If the original shim(s) is unavailable, start
with a 0.50-mm shim.
• Turn the forward gear assembly a few
times until the gear and bearing are hori-
zontal.
(3) Measure the specified measurement
(M).
Shimming gauge
YB-34468-2
6556
M
