Chainsaw Chain Not Getting Oil

Common Symptoms

• Chain and bar look dry — no oil sheen on the bar groove
• Smoke rising from the bar rail during cutting
• Chain dulls extremely quickly, especially at the tip
• Bar rail turns dark blue from heat
• Oil tank empties very slowly or stays full despite running
• Squealing or rattling sound from the drive sprocket area

Most Likely Causes

1. 1

   Clogged Oil Pickup Tube (Most Common)

   The oil pickup tube inside the tank draws oil from the bottom of the reservoir to the pump. Old bar oil thickens in cold weather and the pickup tube's strainer end can clog with wood debris and sap residue. The pickup tube is a clear or black plastic tube inside the tank — visible when you open the oil fill cap and look inside with a flashlight.

2. 2

   Blocked Bar Oil Port

   The oil exits the chainsaw body through a small port (typically 2–4mm diameter) that aligns with a groove in the guide bar. This port clogs with sawdust, sap, and old oil residue. Remove the bar and use a thin wire to clear the port — you should be able to blow air through it freely.

3. 3

   Bar Oil Groove Packed with Debris

   The guide bar has an oil distribution groove running around its inner rail. When sawdust and sap pack this groove, oil can't distribute along the full bar length even if the pump is working. Remove the bar, clamp it lightly in a vise, and clean the groove with a bar groove cleaning tool or a flathead screwdriver.

4. 4

   Failed or Worn Oil Pump

   The worm-gear oil pump is driven off the engine crankshaft. The worm gear is plastic on most STIHL and Husqvarna models and wears over time, especially if the oil tank ran dry repeatedly. A worn worm gear strips and stops driving the pump piston. The symptom: all passages are clear, but no oil exits at the bar port even with the pump set to maximum.

5. 5

   Cracked Oil Tank

   Impact damage or UV degradation can crack the plastic oil tank body. If the tank drains but no oil reaches the bar, and the pump and passages test clear, inspect the tank body and oil passage channels for hairline cracks. A cracked tank is visible when you fill it and watch for seepage.

Quick DIY Checks

1. 1Perform the oil throw test first: start the saw and run it at high throttle for 10 seconds, holding the tip over a clean white surface or cardboard. You should see a visible oil line. No oil line = confirmed delivery failure. A light mist = pump set to minimum. Turn the oil adjuster screw clockwise to increase output if present.
2. 2Remove the guide bar and chain. Locate the oil outlet port on the saw body (the small hole in the bar mounting area). Start the engine briefly and observe — you should see oil weeping out of this port. If oil exits here but not on the bar, the bar's inlet hole or groove is clogged.
3. 3Open the oil tank and use a bent wire to pull out the pickup tube. The tube end has a small filter screen or mesh — clean it by rinsing with fresh bar oil and blowing air through it. Replace the tube if the plastic is cracked or brittle ($5–$12).

1. 4Clean the bar groove. Remove the bar and secure it. Use a flathead screwdriver or bar groove cleaner to scrape hardened debris from the groove around the full bar perimeter. Also check that the bar's oil inlet hole (in the bar slot, near the drive tang) is open — poke with a wire to clear.
2. 5If no oil exits at the body oil port with the engine running, the pump itself is failed. Access the pump by removing the sprocket cover and clutch drum (requires a clutch removal tool). Inspect the worm gear for stripped teeth — on most STIHL and Husqvarna models this gear is gray/white plastic. A stripped worm gear must be replaced ($8–$18).
3. 6After reassembly, refill the oil tank with fresh bar and chain oil (ISO 68 viscosity for most conditions). Run the saw at high throttle for 30 seconds and repeat the oil throw test to confirm delivery is restored before cutting.

Repair vs Replace

Recommended Tools & Parts

• Oil Pickup Tube & Filter (STIHL MS Series)

  Replacement oil pickup tube with filter screen for STIHL MS170, MS180, MS250, MS271, MS291, and similar models. Clears oil starvation at source.

  $5–$12

  Buy on Amazon →

• Oil Pump Worm Gear (Husqvarna)

  Replacement plastic worm drive gear for Husqvarna 435, 440, 450, 455, and 460 chainsaw oil pumps. Restores full oil delivery when gear is stripped.

  $8–$18

  Buy on Amazon →

• Bar and Chain Oil (1 Gallon)

  High-viscosity tackifier bar oil for year-round chainsaw lubrication. Clings to chain at high speed and protects bar rail from heat and wear.

  $12–$20

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.