TM 10-4320-307-24
4-5 PUMP ASSEMBLY SHAFT INSPECT/TEST/REPLACE (CONT).
CLEANING/INSPECTION/REPAIR:
Live steam used for cleaning shall not exceed 100 psi (690 kPa). During
steam cleaning operations, adequate ventilation, natural or forced, should
be provided. Do not direct live steam against skin. Death or serious injury
could occur if compressed air is directed against the skin. Do not use
compressed air for cleaning or drying unless the pressure is/has been
reduced to 30 psi (2.11 kgcm2) or less. When working with compressed air
always use chip guards, eye protection, and other personal protective
equipment.
1.
Steam clean shaft assembly and dry with compressed air.
2.
Check the radial tolerances between the following stationary and rotating items:
Minimum Allowable Clearance
Recommended Maximum Wear Clearance
Item
In/MM
In/MM
Seal Bushing (drive end)
0.009/0.23
0.018/0.46
Shaft Sleeve (drive end)
0.009/0.23
0.018/0.46
Seal Bushing
0.015/0.40
0.031/0.80
Shaft Sleeve
0.015/0.40
0.031/0.80
Casing Wear Rings
0.009/0.23
0.018/0.46
Impeller Wear Rings
0.009/0.23
0.018/0.46
NOTE
Repair of the shaft assembly is limited to the replacement of parts.
TEST:
NOTE
After replacing a new impeller, the shaft and impeller must be tested for
balancing. When replacing the original impeller, balancing is not required.
1.
Balance shaft assembly as follows:
a.
Place shaft and rotors on balancing machine.
b.
Connect shaft to balancing machine.
c.
Start balancing machine and slowly increase speed to 650 rpm.
d.
The maximum allowable unbalance shall be less than 0.024 lbs (11 grams) in each correction plane.
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