6-75
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.
Example:
If “R” is “+5”, then
M0 = 1.10 – (+5)/100 mm
= 1.10 – 0.05 mm
= 1.05 mm
If “R” is “–3”, then
M0 = 1.10 – (–3)/100 mm
= 1.10 + 0.03 mm
= 1.13 mm
6A70
F+5
R-1
P+2
(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
M
6A60
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