How to Change the Chain and Bar on a Stihl MS170 Chainsaw
In this video, we show you how to change the Chain & Bar on a Stihl MS170.
Health & Safety Warning - Please ensure that you have safely prepared the machine and workspace. If you are unsure about any aspect of the task please seek professional advice.
Transcript
Today, we're going to change the Chain & Bar on a Stihl MS170 Chainsaw. Make sure the chain is free before starting. Use a 19mm Hex Socket Spanner to loosen the two nuts that hold on the sprocket cover on the side of the machine. Then use a screwdriver to loosen the chain tensioning screw between the guide bar and the machine, you will notice the chain will begin to become slack. Continue to unscrew the two sprocket cover nuts on the side of the machine. This will allow you to remove the casing, completely freeing the chain and bar. Carefully pull away the chain from the bar until it's fully removed. Make sure the bar & chain are compatible with each other and the machine before fitting. When placing the chain onto the guide bar make sure that the cutting edge, highlighted in red, is facing away from the body of the machine on the top edge of the guide bar. This means that the cutting edge should be facing in the direction of the blades rotation. If the chain is placed in the wrong direction it could lead to further problems, and will give the affect of a blunt chain. This should be avoided by taking the correct precautions. Place your new chain around the bar. Feed the chain around the bar, and check that it is seated correctly. Make sure the chain moves in a smooth motion and it doesn't snag. Place the chain around the chain sprocket. Make sure the two screws are seated in-between the chain bar. Place the casing back on and hand screw on the two nuts. Using the screwdriver to tighten the chain tensioning screw between the guide bar and the machine. Once together, make sure the chain is moving smoothly and isn't too tight and doesn't have excessive slack. That's how you change the Chain & Bar on the Stihl MS170. All the parts & tools needed for this task are listed in the description below.
Parts
Parts and tools included in the MS170 how-to video.
- Stihl Rollomatic Mini Guide Bar 14" - 3005 000 3909
- Stihl Rollomatic Mini Guide Bar 12" - 3005 000 3905
- Stihl 14" Chain Loop PMM3 3/8 Picco 043 - 50 Links - 3610 003 0050
- Stihl 12" Chain Loop PMM3 3/8 Picco 043 - 44 Links - 3610 003 0044
- Sprocket Cover Nut M8 for Stihl Chainsaws - 0000 955 0801
- Chain Sprocket 3/8" Picco 6T for Stihl MS170 MS180 - 1123 640 2003
- Chain Sprocket 3/8" Picco 6T for Stihl MS170 MS180 - Non Genuine
- Chain Sprocket Cover (Quick Tensioner) for Stihl MS170 - 1123 640 1700
- Sprocket Bearing 10x13x10mm for Stihl Chainsaws - 9512 933 2260
- Sprocket Washer 27mm for Stihl Chainsaws - 0000 958 1022
Tools
- 13/19mm Combination Plug/Bolt Spanner for Changing Spark Plugs - Non Genuine
- 13/19mm Torx Wrench/Plug Spanner for Stihl TS410 TS420 - Non Genuine
