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Discussion Starter · #1 · (Edited)
RE: DeWalt 20V Grass Trimmer - DCST920 (Type 3)
will not start.... help

Greetings from Canada!
We bought this trimmer last summer, and were very pleased with its performance and battery life. We used it about 6 times. Pulled it out this spring, recharged battery fully, started then stopped in 2-3 seconds, only couple rotations. Unfortunately, receipt misplaced, info for warranty wasn't registered. Thus warranty service not an option.
Problem Solving Steps:
=================
1. Borrowed neighbor's 20V battery, didn't start.
2. Cleaned trimmer from all debris. Removed Spool trimmer head. Found a spec gra When I removed the Spindle Lock Plate, found a very twisted piece of string & grass debris. Removed. Reassembled trimmer, inserted battery, no action.
3. Google search found that many have experienced problems with this trimmer within few months. Many replaced the DeWalt bumper trim head with a Husqvarna T35, with success. We ordered part, installed & hopes for it to have solved problem ~~ fizzled ~~. Unit would not start.
4. More google search, suggested removing Guard Assembly and just the cover of the Gear Case Assembly, blow out any debris found. Very little grass found was blown out. However, areas of grease buildup on gears & other areas grease free. Is that a sign of something? like over heating? We did not explore further. Reassembled, and trimmer did not start.
5. Further google search led to reading couple reviews on Amazon. Customers found the motor & pinion required replacement. Apparently a common problem for Type 1,2 &3. Dewalt is aware of issue, but will not cover replacement 1 year full nor 3 year part warranty.

See pics below. How does one determine that motor is problem?

Please: Any input, suggestions, feedback is welcomed.
Thank you in advance,
~ very frustrated Gem
 

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Is there any sound, at all, when you pull the trigger?
If you are expecting for grease to be packed in the gears, they usually put a dollop in and call it good.
Sadly, most battery powered outdoor tools just aren't built rugged enough. They are pretty much disposable when they break. Now the battery powered construction tools are a whole different matter as they work great.
 

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RE: DeWalt 20V Grass Trimmer - DCST920 (Type 3)
will not start.... help

We bought this trimmer last summer, and were very pleased with its performance and battery life. We used it about 6 times. Pulled it out this spring, recharged battery fully, started then stopped in 2-3 seconds, only couple rotations. Unfortunately, receipt misplaced, info for warranty wasn't registered. Thus warranty service not an option.
Problem Solving Steps:
=================
1. Borrowed neighbor's 20V battery, didn't start.
2. Cleaned trimmer from all debris. Removed Spool trimmer head. Found a spec gra When I removed the Spindle Lock Plate, found a very twisted piece of string & grass debris. Removed. Reassembled trimmer, inserted battery, no action.
3. Google search found that many have experienced problems with this trimmer within few months. Many replaced the DeWalt bumper trim head with a Husqvarna T35, with success. We ordered part, installed & hopes for it to have solved problem ~~ fizzled ~~. Unit would not start.
4. More google search, suggested removing Guard Assembly and just the cover of the Gear Case Assembly, blow out any debris found. Very little grass found was blown out. However, areas of grease buildup on gears & other areas grease free. Is that a sign of something? like over heating? We did not explore further. Reassembled, and trimmer did not start.
5. Further google search led to reading couple reviews on Amazon. Customers found the motor & pinion required replacement. Apparently a common problem for Type 1,2 &3. Dewalt is aware of issue, but will not cover replacement 1 year full nor 3 year part warranty.

See pics below. How does one determine that motor is problem?

Please: Any input, suggestions, feedback is welcomed.
Thank you in advance,
~ very frustrated Gem


I SAY "EREPLACEMENTPARTS.COM", May have the parts for repair, Have used them several times and very quick on shipping and the repair of product your order parts for, Good LUCK! Keep us posted on progress, THANKS

waltmart
 

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Discussion Starter · #4 ·
Is there any sound, at all, when you pull the trigger?
If you are expecting for grease to be packed in the gears, they usually put a dollop in and call it good.
Sadly, most battery powered outdoor tools just aren't built rugged enough. They are pretty much disposable when they break. Now the battery powered construction tools are a whole different matter as they work great.
Gosh thanks for quick reply, no there is no sound at all when pulling trigger. Thanks for your grease comment. Frustrating that DeWalt Brand trimmer worked only for couple months. Puzzling that despite unit being stored safely over winter without the battery, that it wouldn't start this spring.
 

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Discussion Starter · #5 ·
I SAY "EREPLACEMENTPARTS.COM", May have the parts for repair, Have used them several times and very quick on shipping and the repair of product your order parts for, Good LUCK! Keep us posted on progress, THANKS

waltmart
Thanks for quick reply. Appreciate e-replacementparts.com tip... we live in Canada, meaning shipping & duty taxes are hindrance. Will keep in mind, if no other options available.
 

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maybe the switch is broken... or wires.
do you have a multimeter?... follow the battery voltage in the wires through the switch and to the motor. They are simple devices with just a few wires.
if the motor sees voltage but is not spinning - you have your answer.
if the motor does not see voltage, the circuit is broken somwhere along the way: wires, switch, or battery connector.
 

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Discussion Starter · #7 ·
maybe the switch is broken... or wires.
do you have a multimeter?... follow the battery voltage in the wires through the switch and to the motor. They are simple devices with just a few wires.
if the motor sees voltage but is not spinning - you have your answer.
if the motor does not see voltage, the circuit is broken somwhere along the way: wires, switch, or battery connector.
Thank u for the info. We will give it a try tmrw & let u know how it went
 

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I got a Milwaukee cordless drill a couple years back that was displaying the exact symptoms as your trimmer. I found some little steel shavings stuck to the magnets in the motor, grounding it out on the motor housing. Someone was drilling upward into a piece of steel or iron, and the shavings ended up getting sucked into it. Probably not as likely on a trimmer, but maybe you were doing some metalwork cleanup nearby and some shavings went airborne?
 
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