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Troy-Bilt TB70SS (41ADT70C711) Gas Trimmer

 Troy-Bilt TB70SS (41ADT70C711) Gas Trimmer Parts

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 Fig # Img Part Name Availability Price
A1Throttle Housing Assembly (includes 2-3)
Part #: 753-04829
In stock
6 available
 $4.01
Add To Cart
A2Throttle Trigger
Part #: 753-04119
In stock
25+ available
 $4.05
Add To Cart
A3Throttle Trigger Spring
Part #: 791-182690
In stock
25+ available
 $4.16
Add To Cart
A4Throttle Cable Assembly
Part #: 746-04085A
In stock
25+ available
 $5.76
Add To Cart
A5Upper Drive Shaft and Housing Assembly (Shaft is 25-1/8")
Part #: 753-04344
In stock
25+ available
 $48.88
Add To Cart
A6Shoulder Harness Clamp
Part #: 791-610327
In stock
3 available
 $17.60
Add To Cart
A7Loop Handle Assembly Obsolete - Not Available
Part #: 791-180869
Discontinued
N/A
A8Screw
Part #: 791-181070
In stock
2 available
 $2.44
Add To Cart
A9Deluxe D-Handle
Part #: 791-182167
Backorder:
Unavailable until 04/29/2015
 $47.73
Add To Cart
A10
Bottom Clamp
Part #: 791-182168
Ships in 4 - 8 business days
 $8.52
Add To Cart
A11Split Boom Coupler
Part #: 753-1190
In stock
25+ available
 $11.89
Add To Cart
A12Screw
Part #: 791-182057
In stock
25+ available
 $3.99
Add To Cart
A13Bolt
Part #: 791-181617
In stock
25+ available
 $3.99
Add To Cart
A14Adjustment Knob
Part #: 791-181981
In stock
25+ available
 $6.14
Add To Cart
A15Knob Retaining Nut
Part #: 791-181886
In stock
5 available
 $3.99
Add To Cart
Fig #ImgPart NameAvailabilityPrice
A16Boom Outer Housing 24" (Cable Sold Separatley)
Part #: 753-04089
In stock
8 available
 $29.59
Add To Cart
A17Lower Flexible Drive Shaft
Part #: 791-181166
Note: 24 9/16" long
In stock
25+ available
 $18.41
Add To Cart
A18Upper Clamp Assembly
Part #: 791-153597
In stock
8 available
 $9.61
Add To Cart
A19Anti-Rotation Screw
Part #: 791-145569
In stock
25+ available
 $5.54
Add To Cart
A20Gearbox Assembly
Part #: 791-180549
In stock
9 available
 $74.82
Add To Cart
A21Guard Mounting Screw Assembly
Part #: 791-180547
In stock
13 available
 $6.07
Add To Cart
A22Guard and Blade Assembly
Part #: 791-180548
In stock
25+ available
 $20.86
Add To Cart
A23Blade Assembly
Part #: 791-682061
In stock
25+ available
 $8.59
Add To Cart
A24Outer Spool Assembly w/ Retainer
Part #: 791-153619
In stock
25+ available
 $18.32
Add To Cart
A25Retainer
Part #: 791-610660
In stock
25+ available
 $3.99
Add To Cart
A26Spring
Part #: 791-610317B
In stock
25+ available
 $5.86
Add To Cart
A27Inner Reel
Part #: 753-1155
In stock
25+ available
 $15.04
Add To Cart
A28Bump Head Knob Assembly
Part #: 791-153066B
In stock
25+ available
 $10.04
Add To Cart
A29Switch
Part #: 791-182405
In stock
25+ available
 $5.75
Add To Cart
A
Replacement Line, 0.095 Diameter Obsolete - Not Available
Part #: 791-180120
Discontinued
N/A
Fig #ImgPart NameAvailabilityPrice
AReel And Line Assembly
Part #: 953-1156
In stock
13 available
 $22.05
Add To Cart
AShoulder Strap
Part #: 791-682075B
In stock
25 available
 $23.38
Add To Cart

Enter your engine's type number in this search field to show the parts that match your engine.

Your engine's type number is the second part of the model number stamped on your Briggs & Stratton engine (see picture).

Trimmer Parts

Repair Articles

How to Replace the Fuel Tank on a Troy-Bilt Super Bronco Tiller
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This article will guide you through the process of replacing a broken or damaged fuel tank in a Troy-Bilt Super Bronco tiller.
How to Replace the Muffler on a Troy-Bilt Pony Lawn Tractor
How to Replace the Muffler on a Troy-Bilt Pony Lawn Tractor

In this article we'll walk you through the process of replacing the muffler in a Troy-Bilt Pony Lawn Tractor.
How to Replace the Lower Handle on a Troy-Bilt Super Bronco Tiller
How to Replace the Lower Handle on a Troy-Bilt Super Bronco Tiller

This article will guide you through the process of replacing a lower handle assembly in a Troy-Bilt Super Bronco Tiller...
How to Replace the Starter Assembly on a Troy-Bilt Super Bronco Tiller
How to Replace the Starter Assembly on a Troy-Bilt Super Bronco Tiller

This article walks you through the steps of replacing a broken or damaged started assembly in a Troy-Bilt Super Bronco tiller.
Repair Stories
Symptom:
Broken switch
Parts Used:
Part Number:
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Entry Date:2013-12-06 11:55:59
1 of 1 customers found these instructions helpful
Kill switch died.
No problem. Disassemble handle; Remove old switch; Install new switch; Assemble handle. Make note how the throttle trigger and and throttle spring are attached, in case they come off.
Did these repair instructions help you?
Discussion
Discussion for the Troy-Bilt TB70SS (41ADT70C711) Gas Trimmer

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I followed Mark's excellent youtube video on rebuilding a 2 cycle carb. I have the wt827a and followed the video step by step. Did it here at the computer and paused between each step. So the procedure went very smoothly.

Though, after re-installing the carb. the trimmer won't start. Gas builds up and vapor locks and I can't pull the cord any more until I remove the plug and drain the gas. I've changed plugs, cleaned the plug, but it won't fire now. Any thoughts?

I've double checked the fuel line routes and they are correct.

Before the rebuild, the trimmer started and would idle but would die as soon as you give it gas. So I figured the rebuild would fix it. The gaskets and valve were very dry and brittle.

After reinstalling, it won't even attempt to fire.

Just double checked to make sure I have spark. Tip of plug showing a nice bright blue spark.

Gas just pours out of the engine when I remove the plug.

I removed carb again, snugged the 4 screws on the one side. In the video it looked like Mark didn't use a lot of torque on those screws. So the first time I think they were not tight enough. With moderate strength, they snugged just a bit (no technical measurement for what a bit is, but it was enough to feel movement until they stopped. Though this is the first time I've rebuilt a 2 cycle carb., I am fairly mechanically inclined and have a 'feel' for proper torque when dealing with aluminum threads). But maybe I'm being too cautious. Should I tighten more?

With the carb off, I pressed the primer bulb and fuel came out one of the holes on the side of the carb that mounts to the engine.

But it seems like it just keeps pouring out like a siphon.

Before the carb rebuild, I replaced all fuel lines and the filter, and new primer bulb. One of the lines was blocked as it didn't run at all before. So I replaced the lines, and the trimmer started great. But as mentioned it just immediately died when giving any amount of gas.

This all started because I left it full of gas over the winter (regular gas with ethanol on top of that). I've learned my lesson about that mistake. Just need to get this jungle under control and can't afford another trimmer right now.
rastoma
Reply: Wt827a Carb - Followed Your Vide...

rastoma

I posted the above earlier in a wrong forum. So it's been awhile since I actually did the above steps.

Just a few minutes ago I went through everything. Removed the carb, took it apart again. Everything looks exactly as it should, according to following the video.

I took the muffler off and gas poured out of it.. a LOT. Still getting spark. Won't attempt to fire. Every time I remove the plug it's dripping wet. I don't see any leaks in the fuel lines.
ShotOut
Reply: Wt827a Carb - Followed Your Vide...

ShotOut

You are experiencing severe flooding. The adjustment of the metering valve lever that opens and closes the needle valve to let fuel into the carburetor is crucial. The least little bit of debris under the needle will hold it open and the fuel will flow nonstop. Faulty check valves in the carb will allow fuel to go places it is not supposed to. Also make sure the small micro fine screen inside the carb body is clean. Below it is the needle as you probably observed. I understand you rebuilt it and I know the process, but something is not right. Make sure the metering diaphragm (under the 4 screw cover) is on TOP of the gasket, not right next to the carb body. That would keep the metering lever pushing the needle open all the time, flooding the engine. On the other side of the carb, the fuel pump diaphragm DOES go directly against the carb body. Post back after rechecking your assembly order.
rastoma
Reply: Wt827a Carb - Followed Your Vide...

rastoma

Been fooling with this trimmer on and off for the last 3 weeks. Finally found what I had been missing every time. I used the wrong reed valve. I am so thrilled and ticked off at the same time... ticked that I missed something so simple but crucial.

So, put everything back together today and after priming and pull the crank on position one, I switched to position 2 and the trimmer fired up as easier and smooth as it ever has. Let it run 30 seconds or so and moved to choke to position 3. Engine still idling like a new one. I can give it about 1/3 throttle and it speeds up, smooth and great. 1/3 is not power enough to actually cut any weeds though.

But as soon as I go past 1/3 throttle it starts to die. ARRRRrrrrggghhhhhh!!!!

I know everyone's main thought is go buy a new one. I just can't right now. I'm not working right now (looking of course) and just don't have the money to buy another one.

I know the carb has to be clean as many times I took it apart. I sprayed carb cleaner with through every hole that's accessible and I just don't see how there could be any clogs. I double checked the needle and spring.

Could an incorrect or fouled spark plug cause this behavior? Running smooth at idle and smooth with partial throttle but die on higher throttle?

I can't find the Troy-Bilt TB70SS in any reference chart at any parts store, Lowes, Home Depot or Tractor Supply for the correct spark plug to use. I've read online to use a RDJ7Y but all I can find at 4 difference sources locally is a RDJ7. Is there a difference that could cause problems like this?

Any other suggestions?
1076091
Question: Carb Problems

1076091

My troybilt weedeater that I have had for 2 years wont stay running. It starts and dies.
I troubleshooted all the normal stuff, plug, fuel, filter, took carbureator off and cleaned good, but I noticed the reed assembly piece that goes into crankshaft on bottom of carb assembly appears to be slightly sheered off at the end, I guess from the piston or rod hitting it possibly. Would this be the culprit of my problem you think ?
Tomcowley
Question: Flywheel Shear Pin

Tomcowley

Does the troybuilt TB70SS have a shear pin on the flywheel?
Bruce
Question: Starter Rope

Bruce

My starter rope came out (TB70SS). How do I reattach it?
Scott
Question: Clutch Removal

Scott

I can't figure out how to remove the clutch on a TB70SS weedeater, help?
Randy
Reply: Clutch Removal

Randy

here's the repair link removed
Tim Day
Question: Power Head Quits Turning

Tim Day

The string trimmer head quits spinning. If I turn it upward and tap the motor on the ground, something slips back in place and the trimmer head is now under power, until something becomes disconnected inside, the trimmer head is not under power.
Rod
Reply: Power Head Quits Turning

Rod

Mine does the same; the upper drive shaft assembly and lower drive cable don't engage deep enough and the upper head is rounded out and the cable just slips, resulting in no power to the head.
Craig
Question: Broken Pull String

Craig

I went to use my Gas weed trimmer this year and on the first pull the string came right out of the motor. What do I pull apart to reattach? Where do I start?
My TB70SS runs fine but the trimmer or blower attachment doesn't spin. When I apply more RPMs the motor just revs. It looks to me like the coupler could be stripped. Any idea on replacement? I'm assuming it's b16 on the diagram. Thoughts and suggestions welcome.
Ray McBee
Question: Replacing Crank Rope

Ray McBee

How do I go about replacing a broken starter pull cord?
Phillip
Question: Upper Flexable Drive Shaft

Phillip

I have a TB70SS (troy bilt) trimmer 31cc. I need the upper flexible drive cable (shaft). It does not show on the parts diagram at all. How do I get one?
Mark
Reply: Upper Flexable Drive Shaft

Mark

Hi Phillip,

The upper drive cable is part of the upper drive housing assembly. The upper cable is not sold separately like the lower cable is. The upper drive housing assembly (Item #B6) is part #753-04344 and is available from http://www.ereplacementparts.com .

Good luck with your repair!

-Mark



cd
Question: What Do You Need?

cd

What type of oil do you need for the tb70ss weed wacker?
Mark
Reply: What Do You Need?

Mark

Hi cd,

This trimmer uses 2-cycle oil mixed with the gas. There are many different 2-cycle oils on the market. The following oil should work great...

http://www.ereplacementparts.com/shindaiwa-one-engine-oil-p-532926.html

Thanks!

-Mark
LaVar Hadley
Question: Removal

LaVar Hadley

How do I remove the clutch assembly?
Mark
Reply: Removal

Mark

Hi LaVar,

Removal of the clutch drum isn't too hard of a project at all if you know a few tricks first. We have prepared an article and video that will provide you with all of the information you will need to remove the clutch drum. You can find the article and video at the following link...

http://www.ereplacementparts.com/article/1771/How_to_Remove_a_Trimmer_Clutch.html

I hope this helps you with your repair!

-Mark
Dan
Question: Bronco Tb70ss

Dan

I am trying to figure out how the throttle trigger spring goes into the housing. Can you show me how it goes into it?

Thanks
todd
Question: Pull Rope Replacement

todd

Trying to replace pull rope and can't take red cover off. Got it apart from shaft not from engine.
Mark
Reply: Pull Rope Replacement

Mark

Hi Todd,

Removal of the clutch drum isn't too hard of a project at all if you know a few tricks first. We have prepared an article and video that will provide you with all of the information you will need to remove the clutch drum. You can find the article and video at the following link...

http://www.ereplacementparts.com/article/1771/How_to_Remove_a_Trimmer_Clutch.html

I hope this helps you with your repair!

-Mark
John
Question: Trimmer Head Replacement

John

Are there any after market trimmer head replacements for a Troy Bilt Bronco TB70ss that hold more string? Better Quality?
Hi All,

I have a Troy-bilt TB70SS string-trimmer. The problem I am having is that quite often the attachment fails to spin up when I squeeze the trigger.

When I squeeze the trigger I hear the engine rev up and expect the various attachments to start working. Sometimes they do but more often than not they don't.

I've been able to replicate with multiple attachments so I don't think it has anything to do with the attachments themselves.

Any suggestions?

Thanks in advance!
bec98x
Reply: String Trimmer Attachment Slippi...

bec98x

check to make sure the power head is all the way on. If it is not sometimes the drive shaft is not engaged to the clutch drum. Also check that the connecting mechanism is also seated all the way on the tube.
mrclean53
Question: Troy Bilt TB70SS Gas Trimmer

mrclean53

I have had my trimmer 4 yrs. and it usually works good.But this year it starts up and dies immediately-will not idle.And if it starts and I accelerate it dies.I sprayed carb cleaner in it 2 times overnite and no help.I noticed the primer bulb doesn't fill with gas as i prime it like it used to.Is the primer bulb the culprit? Or could the idle need adjusting?Any advice would be greatly appreciated. Thanks, Bob
Shrxfn
Reply: Troy Bilt TB70SS Gas Trimmer

Shrxfn

I just had this problem and I replaced the primer bulb it had a hairline crack in it. One other way to tell is if the primer bulb fills half way before starting and then you have to refill it once it dies as it sucks all of the gas out of it. Once I fixed this I found out that my fuel line is also suspect but I am unable to find just the fuel line. This was just my experience. BTW the primer bulbs can be found at Lowes. Fuel lines nowhere to be found yet. I am on hold with Troy Bilt techsupport to see if I can just get the fuel line.
ekahielua54
Reply: Troy Bilt TB70SS Gas Trimmer

ekahielua54

I don't see a carb repair kit listed in the parts list, you might want to replace the carb...
ShotOut
Reply: Troy Bilt TB70SS Gas Trimmer

ShotOut

A primer bulb will not work correctly when 1. There are holes in the fuel lines inside OR outside the tank 2. The fuel filter has broken off the line inside the tank and is not staying immersed in fuel. 3. The fuel lines are breaking up and bits and pieces are inside the fine metal screen IN the carburetor 4.. The main nozzle check valve is stuck open in the throat of the carburetor.5. The dreaded hairline crack in the bulb itself.These symptoms are quite easy to check. Sometimes, just replacing the bulb is not enough. The fuel lines and filter need to be replaced too. The covers need to be taken off of the carburetor and the inside of the carb cleaned....especially the circular fine mesh screen under the pump cover. When it clogs with debris, the primer can't pull fuel into the carb because the clog stops it.
There are repair kits for all of these small diaphragm carburetors..Full rebuild or gasket and diaphragm kits. You need to KNOW the make and model of the carb or disassemble it and compare the parts to PICTURES of parts in the kits to get the correct one. New parts are NOT that hard to replace on these. Ebay is a great place to find kits.
As far as mrclean53's machine, I think he needed a new fuel pump diaphragm for the carburetor. His is acting typical of a failed, dried out one. He is fortunate it ran well for 4 years, considering the damage ethanol in fuel causes.
I just realized how old this thread is, but the primer bulb failures REMAIN the same.
Whenever I click on https://forums.ereplacementparts.com/power-tool-repair/57277-check-valve-failures.html I am allowed to go to the originating post.

I posted a comment at Discussion for Nozzle Assembly - Check Valve - ( 84-613-1 ) and located it within the forum threads.
BUT! If, after reading that post, I click on either 'Previous' or 'Next' threads I get the following error message: "Firefox can't find the server at forums.ereplacementparts.compower-tool-repair."
I'm sure there is an explanation for this error, but how can I remedy the problem? :confused:
This product worked good for about a month after I bought it. It was a giant pain to start and then it would only run on half choke. Recently the starter cord pulled out and I don't think its even worth it to fix it. The string head was ridiculous as well.
Larry w. Herrington
Review: Troy-Bilt - TB70SS Troy Bilt TB ...

Larry w. Herrington

I cannot give this trimmer any rating I have own this weed trimmer for less than one(1) year. It runs sometime an has never functioned properly from the first day I purchased it!! I personally think that the 3 stooges engineered this contraption. I am sure that I am not the only person who owns one an has the same headaches. I am 72 years old ; over the years I have own craftsman tools and have worn them out, but they have been reliable and serviceable this trimmer should be taken off the market. I wanted something I could use when I needed it. I might as well bought something else closer to a sickle I would have got my monies worth. I am recommending that nobody should buy this trimmer.
David P
Reply: Troy-Bilt - TB70SS Troy Bilt TB ...

David P

I bought one of these trimmers in 2004 and have been running it to the present. Last week the pull cord pulled out partially and will not retract back in. I plan to repair it and continue to run it. I am very pleased with the way it has performed.I have used it as a trimmer, pole saw , and blower.It has performed very well with all these attachments.
Alvin
Reply: Troy-Bilt - TB70SS Troy Bilt TB ...

Alvin

I know what you mean. Mine worked for about 6 months then nothing but issues. My wife bought a weed eater brand has been working for over a year with no problems.
Miguel Portilla
Reply: Troy-Bilt - TB70SS Troy Bilt TB ...

Miguel Portilla

I have to agree with you Larry. I also have this trimmer. I have owned it for about 2 years and its been nothing but trouble since the beginning. The quality and design on so many parts is very poor. I would strongly recommend to anyone to stay away from this product and Troy Built products. I will never purchase a Troy Built again.
Gene Rice
Review: Troy-Bilt - TB70SS
1 star
Gene Rice
Never bought such a ps of junk in my 67 years.. Will not buy another.. Will pass on the my feelings..
Larry W. Herrington
Reply: Troy-Bilt - TB70SS

Larry W. Herrington

I agree, see my remarks, I think I have screwed up an given it a too high rating. I gave it a 5 and it should have been a Zero!!!!
fancyboxy