Yamaha MM700A, Manual, Page: 35 / 282

GENERAL INFORMATION 29
Shaft
Driver
Spacer
Bearing
Housing
Oil
NOTE
Remove and install the bearings with a suit-
able size socket and extension.
c. Hold the housing with the bearing side down and
tap the bearing out. Repeat for all bearings in the
housing.
d. Before heating the bearing housing, place the new
bearing in a freezer if possible. Chilling a bearing
slightly reduces its outside diameter while the
heated bearing housing assembly is slightly larger
due to heat expansion. This makes bearing installa-
tion easier.
NOTE
Always install bearings with the manufac-
turer
's
mark or number facing outward.
e. While the housing is still hot, install the new bear-
ing(~) into the housing. Install the bearings by hand,
if possible. If necessary, lightly tap the bearing(s)
into the housing with a socket placed on the outer
bearing race (Figure 58). Do not install new bear-
ings by driving on the inner bearing race. Install the
bearing(s) until it seats completely.
Seal Replacement
Seals (Figure 59) are used to contain oil, water, grease
or combustion gasses in a housing or shaft. Improper re-
moval of a seal can damage the housing or shaft. Improper
installation of the seal can damage the seal. Note the fol-
lowing:
1.
Prying is generally the easiest and most effective
method of removing a seal from a housing. However, al-
ways place a rag underneath the pry tool to prevent dam-
age to the housing.
2. Pack waterproof grease in the seal lips before the seal
is installed.
3. In most cases, install seals with the manufacturer's
numbers or marks facing out.
4.
Install seals with a socket placed on the outside of the
seal as shown in Figure 60. Drive the seal squarely into
the housing. Never install a seal by hitting against the top
of the seal with a hammer.
SNOWMOBILE OPERATION
Snowmobiles are ideal machines for getting around
otherwise inaccessible areas during winter months. How-