4/02
Form 3049
To maintain best engine performance and to prolong engine life - replace your impeller annually.*
Three tips to help you install your new impeller:
• Use a non-petroleum based lubricant (silicon or soapy water) to help slide the impeller into the housing.
• Install the impeller with a twisting motion onto the shaft. Never force an impeller onto the shaft. The impeller
must be able to move freely on the shaft to properly prime and function.
• Use a small amount of non-petroleum based lubricant to help hold the o-ring when replacing the cover.
Proper storage of the impellers during a prolonged lay-up can help maintain the life of the impeller.
Remove the impeller from the housing and store it a cool dark place. This will avoid the following:
• Copper bonding of the impeller to the housing
• Vanes "setting" into position as stored in the housing
• Ultraviolet deterioration
* See Maintenance Schedule on page 5
Genuine Sherwood Tech Tips
Inspection
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 as the entire
shaft and bearing assembly (see page 3 for proper assembly number).
Ripped
Vane
Bead Worn
To A Flat
Pitting
Cavitation
Bowed (set)
Tear