GENERAL INFORMATION CU800 Service Manual
29
CAUTION
Before heating the housing in this procedure, wash the housing thoroughly with
detergent and water. Rinse and rewash the cases as required to remove all traces
of oil and other chemical deposits.
a. Heat the housing to approximately 100℃ (212°F) in an oven or on a hot plate. An easy way to
check that it is the proper temperature is to place tiny drops of water on the housing; if they
sizzle and evaporate immediately, the temperature is correct. Heat only one housing at a time.
CAUTION
Do not heat the housing with a propane or acetylene torch. Never bring a flame into
contact with the bearing or housing. The direct heat will destroy the case hardening
of the bearing and will likely warp the housing.
b. Remove the housing from the oven or hot plate, and hold onto the housing with welding gloves.
It is hot!
NOTE
Remove and install the bearings with a suitable 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 installation easier.
NOTE
Always install bearings with the manufacturer’s mark or number facing outward.
e. While the housing is still hot. Install the new bearing(s) into the housing. Install the bearings by
hand. if possible. If necessary, lightly tap the bearing(s) into the housing with a driver placed on
the outer bearing race (Figure 45). Do not install new bearings by driving on the inner-bearing
race. Install the bearing(s) until it seats completely.
1.11.10 Seal Replacement
Seals (Figure 49) contain oil, water, grease or
combustion gasses in a housing or shaft.
Improperly removing a seal can damage the
housing or shaft. Improperly installing the seal can
damage the seat. Note the following:
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