TM 3-4230-209-30&P
2-108
2-22. CENTRIFUGAL PUMP (CONT).
REMARKS
ACTION
LOCATION/lTEM
Turn the assembled unit so that the end cup is pointing downward for
Centrifugal Pump/
easy measurement. It is recommended that the unit be blocked to steady
it while measurements are taken.
Determine the number of shims that will be required for the following
procedures.
Step 1. Place a very stiff, smooth length of metal such as a machinist's
parallel over the opening in the pump tank. The metal serves as a
measuring reference point.
Step 2. Using a depth micrometer or depth rule, measure from the top of
bar "A" to "B" and record the measurement. Measure from bar "A"
to "C" and record the measurement.
Step 3. Subtract the recorded measurement "A" to "B" from the recorded
measurement "A" to "C." This measurement must be between
0.018 to 0.063 inch less than the "A" to "B" measurement.
Step 4. Using shims of 0.005 or 0.015 inch thickness in any combination,
bring the unit into the established limits of 0.018 to 0.063 inch
clearance.