CB-9A-040 page 19
MAINTENANCE
BEARING REPLACEMENT
NOTE:
When replacing the bearings, the entire bearing assembly, including the bearing cup and the bearing
cone, must be replaced.
1.
Follow all steps in "Compressor Disassembly."
2.
Remove the Oil Pump per the section on "Oil Pump Replacement".
3.
Remove the flywheel.
4.
Remove the bearing carrier and gasket from the outboard end of the crankcase. The outboard bearing
cup will come off with the bearing carrier and will need to be removed with a bearing removal tool.
5.
Remove the key from the crankshaft and slide the crankshaft through the outboard end of the crankcase.
Once the crankshaft is removed from the crankcase, the bearing cones can be removed with a bearing
puller.
6.
Remove the bearing cover plate from the inboard end of the crankcase. The inboard bearing cup is
pressed into the crankcase and can be removed with the use of a bearing removal tool.
7.
To install the bearings:
a. Grease the outer edges of the
bearing cups.
b. Refer to the drawing for the
proper orientation, and carefully
press the inboard bearing cup
into the crankcase until it is
flush with the outer surface of
the crankcase.
c. Carefully press the outboard
bearing cup into the bearing
carrier assembly, noting the
proper orientation.
d.
Press a bearing cone onto each
end of the crankshaft with the
tapered end outward. The
bearing race should rest against
the shoulder on the crankshaft.
e.
Lubricate the bearings with grease.
8.
Install the crankshaft through the outboard end of the crankcase.
9.
With the oil pump assembly removed, install the bearing carrier and gasket (the bolt holes are positioned
to ensure proper orientation). Tighten the bolts evenly per the Bolt Torque Table.
10. Reinstall the inboard bearing cover plate and a trial set of shims. If the bearings have not been replaced,
use the previous shim set. If the bearings have been replaced, use a
thicker
trial set of shims.
11. Rotate the crankshaft by hand to verify free movement of the shaft.
NOTE: If the crankshaft is loose, with an excessive amount of end play, too many shims have been used.
Lateral crankshaft movement (end play) between the bearings should be 0.0015" to 0.0030" (0.038 to
0.076 mm). If necessary, remove shims until the end play is within tolerance.
If the crankshaft binds, or will not turn, not enough shims have been used pushing the bearing cup too
tight against the bearing cone. In this case, the crankshaft must be removed from the crankcase and the
inboard bearing cup must be driven out toward the inboard side of the crankcase. Reinstall the crankshaft
and the bearing cover plate using additional shims as required.
12. Install the oil pump per the "Oil Pump Replacement" section.
13. Reassemble the compressor according to "Compressor Assembly."
Summary of Contents for HD172A
Page 23: ...CB 9A 040 page 23 NOTES...
