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SHERWOOD Pump Preventative Maintenance and Inspection
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Pleasure Boating |
Commercial/Fishing Use |
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Maintenance |
(Low Hours) |
(High Hours) |
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Schedule
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Light Duty Severe Duty (High RPM, Silt or Sand) |
Heavy Duty Severe Duty (High RPM, Silt or Sand) |
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Impeller Kit |
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Every year |
6 - 12 months |
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6 - 12 months |
3 - 6 months |
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Minor Kit |
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2 years |
Every year |
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Every year |
6 months |
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Major Kit |
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4 years |
2 years |
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2 years |
Every year |
The #1 reason for premature engine wear is overheating.
To maintain engine performance, insist upon genuine Sherwood impellers and service kits.
Recommended inspection to be performed at any service interval:
Impeller . . . . . . . . . Inspect for cracks or tears. Also, inspect for excessive abrasion of vane ends. Replace annually, or if any of the conditions exist, as in the picture below.*
Wear Plate . . . . . . . Inspect for wear, flatness, and pin for fatigue. Replace at major pump rebuild or if wear is evident to maintain pump flow and suction performance.
Cam . . . . . . . . . . . . Replace at minor or major pump rebuild or if pitting/wear is evident.
Cover . . . . . . . . . . . Replace at major pump rebuild or if wear exists to maintain pump flow and suction performance.
Mechanical Seal Replace at minor and major pump rebuild or if leaking.
Lip Seal . . . . . . . . . . Replace at major pump rebuild or if leaking.
Shaft . . . . . . . . . . . . Inspect for wear in area of lip seal and rubber impeller. Grooving of lip seal area or heavy fretting of the impeller end shaft will require shaft replacement.
Bearing . . . . . . . . . . Inspect for loss of grease, corrosion or rough rotation. Replace at major pump rebuild.
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