Benchmark 5240-050 - Chainsaw Maintenance Procedures; Bar and Chain Disassembly;Assembly; Chain Tension Adjustment and Maintenance

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DISASSEMBLE THE WORN BAR AND CHAIN
1. Remove the battery, allow the saw to cool and tighten the oil tank cap.
2. Position the chainsaw on its side with the side cover facing upwards.
3. Wear gloves. Remove the side cover by turning the side cover knob
counter-clockwise. Clean the side cover with a dry cloth.
NOTE: This is a good time to inspect the drive sprocket for excessive wear
or damage.
ASSEMBLE THE NEW BAR AND CHAIN
Follow the instructions in the ASSEMBLING/ REPLACING THE BAR AND CHAIN
section in this manual.
ADJUST THE CHAIN TENSION
Follow the instructions in the ADJUSTING THE CHAIN TENSION section in
this manual.
CHAIN MAINTENANCE
WARNING: Always wear gloves when handling the saw chain; these
components are sharp and may contain burrs.
Use only low-kickback chains on this saw. This fast cutting chain will provide
kickback reduction when properly maintained.
A properly sharpened saw chain cuts through wood eortlessly, even with very
little pressure.
Never use a dull or damaged saw chain. A dull saw chain cutter leads to increased
physical strain, increased vibration load, unsatisfactory cutting results and
increased wear.
For smooth and fast cutting, the chain needs to be maintained properly. The chain
requires sharpening when the wood chips are small and powdery, the chain must
be forced through the wood during cutting, or the chain cuts to one side. During
maintenance of your chain, consider the following:
• Improper filing angle of the side plate can increase the risk of a severe kickback.
• Raker (depth gauge) clearance. Too low increases the potential for kickback.
Not low enough decreases cutting ability.
• If cutter teeth have hit hard objects, such as nails and stones, or have been
abraded by mud or sand on the wood, have the chain sharpened by a qualified
service technician.
NOTE: Inspect the drive sprocket for wear or damage when replacing the chain.
If signs of wear or damage are present in the areas indicated, have the drive
sprocket replaced by qualified service technician.