Lesson 3/Learning Event 1
LEARNING EVENT 1:
PERFORM MONTHLY AND QUARTERLY
CHECKS AND SERVICES ON THE 50-GPM PUMP
On a monthly and quarterly basis at organizational preventive maintenance, you must perform all
the checks and services which have previously been discussed. You must also inspect the entire
pump unit for operational damage and each component for wear and damage. You must clean the
pump with clear water, rinse it, and dry it. You must also inspect and tighten all hardware on the
unit if required.
In correcting deficiencies on the 50-GPM Pump, organizational maintenance is allowed to make
more extensive repairs than the operator. Subsequent paragraphs explain how to disassemble and
reassemble components of the pump for repair when required.
Centrifugal Pump Assembly
In servicing the centrifugal pump assembly of the 50-GPM Pump, clean the pump body with
pressurized water. Spray the interior and exterior and allow to dry. Clean pump components
thoroughly. Use an approved solvent on metal parts. Inspect all parts for cracks, excessive wear,
or damage and deterioration. Replace or repair as necessary. When the gasket check valve,
impeller, or seal assembly (figure 6 on page 29 and figure 7 on page 30) needs servicing or
replacing, you will need to disassemble the centrifugal pump to perform the service. The
following paragraphs tell how to disassemble the pump for access to and service of parts.
Check Valve. The check valve is also called the suction valve. To obtain access to it refer to
figure 7 on page 30 and unscrew the suction flange nuts (37). Remove the suction flange (2),
exposing the check valve gasket (5) to which two weights (4 and 6) are attached.
Do NOT pry with a sharp instrument. You could damage the gasket.