Symptoms
- No oil residue on the bar after cutting
- Bar and chain feel hot after short use
- Blue smoke from the bar area
- Chain wears out much faster than normal
Likely causes
- CommonEmpty or low bar oil reservoirThe most overlooked cause; bar oil is separate from the fuel mix and must be refilled regularly.
- CommonClogged oil outlet hole or bar grooveSawdust and debris block the small oil passage on the bar.
- PossibleClogged oil filter or pickupDebris in the reservoir blocks the oil pickup tube.
- PossibleWorn or failed oil pumpThe pump's drive gear or plunger wears out over years of use.
- Less commonWrong or too-thick oil in cold weatherUsing non-bar oil or oil too thick for the temperature can restrict flow.
What to do
- Check the bar oil reservoir level and refill with proper bar and chain oil if low.
- With the saw off, clean out the oil outlet hole on the bar with a small wire or pick.
- Remove the bar and clean the groove and oil holes along its length.
- Check the oil filter inside the reservoir (if equipped) and clean or replace it.
- Hold the saw a few inches above a light surface, run it at half throttle, and look for a line of oil flinging off the chain to confirm flow.
- In cold weather, switch to a lighter-viscosity bar oil rated for the temperature.
- If no oil flow appears after cleaning, the oil pump likely needs professional replacement.
Tools and parts
- Bar and chain oil
- Small wire or pick
- Bar wrench
Bar and chain oilSearch: “chainsaw bar and chain oil”
Oil pump kitSearch: “chainsaw oil pump replacement”
When to call a pro
If the reservoir, filter, and bar groove are all clear but oil still isn't flowing, a small-engine shop can replace the oil pump.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.