Repair Procedures BPU 2440/2950 Repair
wc_tx000329gb.fm 30
5. Repair Procedures
5.1 General Repair
The repair procedures specify using sealants and screw and nut
adhesives to seal metal surfaces and secure fasteners in place. These
products must be used where indicated.
Although Loctite is referred to throughout this manual, an equivalent
sealant such as Hernon or Omnifit may be used. When using sealants,
always follow the application instructions on the container. Refer to the
thread locking and sealant chart located in this manual.
Most thread locking sealants break down at temperatures above
350°F (177°C). If a bolt or nut resists separation, apply heat to it using
a small propane torch. When doing so, check to make sure no other
portion of the unit will be damaged from the use of the torch.
Correct torque values are listed whenever possible. Follow these
specifications when replacing or tightening screws and nuts. This is
especially important at sealed surfaces where screws must be
tightened evenly to ensure airtight seals thus preventing leaks.
The step-by-step procedures listed here provide complete descriptions
for the removal and replacement of all serviceable parts. However,
items such as bearings and shafts, assembled with press fits, should
be inspected for wear and damage while still in place. Removing or
installing such items often requires tools or presses to do the task
properly.
When installing bearings into housing, apply pressure only to the outer
race of the bearing. If pressing a bearing onto a shaft, pressure should
be applied only to the inner race. Apply pressure evenly around the
bearing. Avoid using a hammer to pound bearings in place.
If using heat to fit a bearing onto a race, use a hot plate or hot oil bath
where the temperature can be controlled. Never heat a bearing using
a propane torch. Excessive heat, over 350°F (150°C), can affect the
hardness characteristics and tolerance values of the bearing.
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