DescriptionThis video provides step-by-step repair instructions for replacing the oil pump on a Homelite chainsaw. The most common reason for replacing the oil pump is when the cutting chain doesn’t run smoothly.
All of the information for this oil pump replacement video is applicable to the following brands:
Homelite
Tools used: multi screwdriver, T25 Torx screwdriver, flat head bit, spark plug wrench, cord, clutch removal tool, adjustable wrench, needle-nose pliers
Step-By-Step Instructions1
Before you replace the oil pump on your chainsaw first make sure the engine has cooled the on-off switch is in the “off” position and the chain brake is disengaged.
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We recommend performing this procedure with little or no oil in the tank.
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Now push the bar tensioner knob in and rotate it counter-clockwise to remove the chain cover.
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Push the bar back to loosen and remove the cutting chain.
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Use a t-25 torx bit screwdriver to remove the screws securing the top cover.
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Remove the wire and boot from the spark plug.
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Use a socket or a spark plug wrench to help unthread the spark plug.
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Confirm that the piston is in the “down” position then insert a cord into the cylinder to prevent the piston from moving.
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Next, use a small flathead screwdriver to remove the e-clip securing the clutch sprocket.
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Pull the clutch washer and the sprocket off.
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Using a clutch tool, rotate the clutch clockwise to loosen then unthread the clutch.
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Remove the large washer.
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Now use a t-20 torx bit screwdriver to remove the mounting screws to release the oil pump.
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Detach the inlet and outlet oil tubes from the pump and pull the old pump free.
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Install the new oil pump by positioning it on the engine shaft.
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Attach the two oil tubes to the appropriate ports on the new pump.
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Fully seat the pump and replace the mounting screws to secure.
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Confirm that the outlet tube is properly seated in the slot in the housing.
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Replace the large clutch washer.
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Now rethread the clutch counter-clockwise onto the engine shaft and use the clutch tool to tighten.
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Remove the cord from the cylinder and rethread the spark plug.
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Be careful not to over tighten.
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Reattach the wire and boot to the spark plug.
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Realign the top cover and replace the screws to secure.
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Slide the clutch sprocket back onto the engine shaft.
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Reposition the washer with the beveled edge facing outward and secure the assembly with the e-clip.
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Realign the cutting chain on the chain bar.
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Make sure the teeth on the chain are facing towards the front end of the chain bar on the top and away from the front end on the bottom.
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Loop the chain onto the clutch sprocket as you align the chain bar on the mounting bolts.
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Reposition the chain cover by inserting the chain tensioner pin into the bar – be aware you may need to adjust the position of the pin to fully align the cover.
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Secure the cover loosely by rotating the bar tensioner knob clockwise.
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Now lift the bar and rotate the chain adjustment dial clockwise until there is no slack in the chain.
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Once the chain is taut, tighten the tension on the bar.
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With the repair completed turn the on-off switch to the “on” position fill the oil tank with oil and your chainsaw should be ready for use.