Notes from the woodpile

Tietoc mini chainsaw chain tension and replacement

Ask anyone with a Tietoc mini chainsaw and they will tell you the same thing: the chain seemed loose after a few cuts. That is normal, and fixing it takes a screwdriver and two minutes. Here is how to set chain tension on a Tietoc mini chainsaw, when to replace the chain and how to fit a new one.

Why a new chain loosens

A new chain stretches slightly as the links seat against each other and the bar. Expect to re-tension it after the first few cuts and again after the first session. A loose chain sags under the bar, slaps, cuts slowly and can jump off the guide bar; a chain that is too tight drags, heats up and drains the battery.

How to set chain tension

• Remove the battery
• Loosen the bar nut on the side cover a little, so the bar can move
• Turn the tension screw with the included screwdriver until the chain sits snug against the underside of the bar
• Pull the chain along the bar by hand (wearing gloves): it should move freely, and you should be able to lift a drive link slightly without it leaving the groove
• Hold the bar nose up and tighten the bar nut

On the Tietoc 2-in-1 pole saws, a tool-free knob replaces the screwdriver; the check is the same.

When to replace the chain

A sharp chain throws chips; a dull chain makes fine dust. Other signs are a saw that pulls to one side, smoke even with oil in the tank, and cuts that need you to push. Hitting dirt, a stone or a nail can dull a chain instantly. Mini chainsaw chains can be sharpened with a small round file, but a replacement chain is inexpensive and restores full speed at once.

Choosing a replacement chain

A chain must match three numbers: pitch, gauge and drive-link count. The Tietoc 6-inch chain is 1/4-inch low-profile pitch, 0.043-inch gauge and 36 drive links, with full-chisel cutters. Count the drive links on your old chain if you are not sure. 8-inch saws need an 8-inch chain; the dual-bar and pole saw kits include spares for both sizes.

Other parts to check while the chain is off

A chain change is the right moment for a quick look at the rest of the saw. This short list covers the common problems that could cost you a project later:

• Guide bar: a burr, a worn rail or an uneven groove means the bar needs replacement too
• Oil port and lubrication: clean sawdust out of the port so the oiler can keep the new chain lubricated
• Sprocket: worn, hooked teeth damage a new chain quickly
• Cover and splash guard: cracks are a safety issue, so replace them before the next cut
• Battery and handle: check the rail is clean and the pack clicks in firmly

Genuine Tietoc parts are made to be compatible with the saw, which saves guesswork and keeps quality consistent. A couple of spare chains and a second guide bar are handy for seasonal storm clean-up, when a long day in the yard can wear through a chain. If you report a fault to the store you bought from, these checks also help describe the problem. With correct tension, clean lubrication and a sharp chain, the Tietoc mini chainsaw will tackle garden branches and firewood projects for a long time, and the motor will thank you.

Fitting a new chain

• Remove the battery and loosen the bar nut and tension screw
• Take off the side cover and lift the old chain off the sprocket
• Flip the guide bar so both rails wear evenly
• Lay the new chain around the bar with the cutting edges on top facing forward, toward the nose
• Seat the drive links in the groove and around the sprocket, refit the cover
• Tension as above, oil the chain and run it for a few seconds before cutting

If the guide bar rails are worn, bent or have a burr, replace the guide plate at the same time so the new chain runs true.