20 Most Recent Troy-Bilt 4-Cycle Curve Shaft Gas String Trimmer #41ADT41C966 Questions & Answers

There is a round, rotary black part between the metal piece to which the cutting head attaches and the outer plastic seat of the cutting head. There are two square slots, each about a quarter inch wide, on opposites sides of the black piece. Slide an Allen wrench or something similar firmly into the slot. Holding the Allen wrench in a stable position, turn the outer plastic ring of the cutting head (it has scalloped edges that can be gripped firmly) counter clockwise to unscrew the cutting head from the bolt on which it is mounted. Be careful with the tool (e.g. Allen wrench) used to hold the black piece steady, as it is plastic and could be damaged by the edge of the tool.

Troy-Bilt... | Answered on Sep 14, 2019

Owners manual will state proper oil to be used but a good bet is that it requires SAE 30 wt. oil. Check and make sure no cooling fins are clogged with dirt, grease, debris, insect nests etc. Oil helps cool your engine also, but the proper amount is very important. I recommend synthetic oil for engine longevity. It's superior to standard oil for different reasons.

Troy-Bilt... | Answered on Sep 11, 2019

Threads are left hand. Hold the black wheel and use large plier or pipe wrench to turn the knob cloclwise

Troy-Bilt... | Answered on Jul 02, 2019

change spark plug or like mine it my only use non-e85 gas

Troy-Bilt... | Answered on Feb 01, 2018

Replacement head can be purchased from amazon, here Amazon com troy built head. I hope this helped you. Have a nice day. Vince

Troy-Bilt... | Answered on Jan 31, 2018

Believe you may have bad gears in item no. 17 would try replacing. To see this diagram go to partstree.com type in your model no. etc.iplimage (3)-pdt4gccsesyirln1xmij4nvf-5-0.png

Troy-Bilt... | Answered on Oct 12, 2017

Your clutch has failed. Most common reason is a broken clutch spring, but sometimes a shoe will break. To get to your clutch, you need to separate the engine from the shaft at the front face of the engine, NOT where the shaft enters the engine housing.

Troy-Bilt... | Answered on Sep 28, 2017

Non detergent, straight 30 weight.

Sometimes can be found labeled as "Tractor Oil". Otherwise, any premium 10w-30 I find in my experience with these stout 4-cycles to be just fine!

If breaking in engine from new, out of the box? Change oil with 10 hours on the clock with engine is still warm. You only need 3.2 Oz. to fill the crankcase!

So pour slowly. It is full when the trimmer is placed on a level workbench surface with the trimmer head dangling off the end. There is going to be a slight forward tilt away from the oil fill plug. Fill only until it just literally comes to the bottom of the oil fill plug with the trimmer laying flat on your workbench.


(I warned you. ;D )

Also at this time, clean and re-oil air filter and check your manual - these trimmers after break in require a valve lash adjustment. .005" @ TDC if my memory is correct....The manual I *think* states anywhere from .003 ~ .007 to be within spec. After break in, only need to adjust valves seasonaly. Regular oil changes @ 20~25 hours of run-time keeps them happy.

Troy-Bilt... | Answered on Jun 16, 2017

Mark, Ensure plug is good, remove,inspect replace in tn tank fuel filter if clogged, remove muffler and clean screen in side, carb., carb. could be dirty or out of adjustment or diaphragms worn out and needs rebuilding. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
String Trimmer Starts Then Stalls
Toro String Trimmer Starts Then Stalls
My String Trimmer Starts But Won Stay Running

Troy-Bilt... | Answered on Jun 11, 2016

Al, .025" is the plug gap for your trimmer,page 20 in your manual. There may be a recall on your model to do with safety.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Troy Bilt Model TB425CS Parts
Troy Bilt String Trimmer Sold at Lowe Recalled for Laceration Hazard

Troy-Bilt... | Answered on May 15, 2016

Contact the consumer desk.

TB22 EC Curved Shaft String Trimmer by Troy-Bilt


Troy?Bilt Products
Rating: 3.7 - ‎232 votes - ‎$99.99 - ‎In stock
25cc, 2-Cycle Gas Trimmer / Attachment-Capable Design ... The TB22 EC gas string trimmer is both JumpStart™ and TrimmerPlus® attachment capable, making ...

Gas Trimmer ' TB635 4-Cycle Curved Shaft ... - Troy-Bilt


Troy?Bilt Products
Rating: 3.3 - ‎32 votes - ‎$179.99 - ‎In stock
The TB635 EC curved shaft gas trimmer with SpringAssist™ technology features the new Click N Trim™ bump head, making line replacement easier than ever. ..... next one they put on - will only run for about 4 seconds. they've had for about 2 ... Both String Trimmer and Edger work great, easy to start and very low vibration.

Troy-Bilt... | Answered on Dec 09, 2015

sounds like your flex cable has taken a trip south. Pull the shaft off the head and take a look at the flex cable. If flex cable is ok, they your clutch is defective.

Troy-Bilt... | Answered on Oct 03, 2015

Once all the bolts are removed, tap all the way around, (with a rubber mallet), where the head meets the bottom portion of the motor. It should come right off with a little coaxing.


Troy-Bilt... | Answered on Jul 03, 2015

Recoil spring is broken or slipped out of retention slot. Coil needs to be retentioned or replaced. Unless you have done this before I recommend taking to pro. This is easy job if you have the jig but almost impossible if you don't.

Troy-Bilt... | Answered on May 15, 2015

???? you got me there in time .

Troy-Bilt... | Answered on Feb 28, 2015

Google Troy-Bilt and they should have a link to download a PFD showing the manual.

Troy-Bilt... | Answered on Nov 27, 2014

Remove the plug wire boot from the plug and the use a 16 mm. socket to remove the plug. Check the gap on the new plug and install in reverse order.

Troy-Bilt... | Answered on Oct 29, 2014

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