Part Location Diagram of N498091 DeWALT SA GEAR AND SPINDLE, SERV ONLY
See part 17 in the diagram
( Grid squares measure 1x1 inch )

SA GEAR AND SPINDLE, SERV ONLY N498091

Manufactured by:
DeWALT
ERP Number:
ERP18994000
Part Number:
N498091
Original Equipment Manufacturer ?
In Stock
Delivers in 3-5 Business Days!

Easy 

15 - 30 mins 

(47 rated repairs) ?

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Product Description

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This is a Genuine OEM Sourced replacement part designed for Black and Decker String Trimmer. This item is used to secure and drive the Spool. It is made out of Plastic and Metal. Includes a Plastic Housing, Plastic Gear, Metal Bearing and Two (2) Metal Eyelets.

Troubleshooting

This part fixes the following symptoms:
  • Engine revs but trimmer head will not turn
This part works with the following brands:
  • Black and Decker
  • Craftsman
This part works with the following products:
  • Trimmer
Part# N498091 replaces these:
N498091,

Customer Part Reviews

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4.8
Average Rating (out of 5):
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(68 Reviews)
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Questions & Answers

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I don't see a parts diagram for this Craftsman 40 volt string trimmer. I want to make sure I am ordering the correct part labeled line trimmer cutting head & gear for the 40 volt model.
Norine For model number 98020 - June 22, 2022

Hello Norine, Thank you for contacting us. We have researched the model you have provided and have found the part you are looking for is Part Number:N498091. If you need help placing an order, customer service is open 7 days a week. Please feel free to give us a call. We look forward to hearing from you!

eReplacementParts Team
June 22, 2022

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On my black and decker weed Wacker it was trimming fine then it sounds like something inside broke . It just spins but don't spin the spool and line. What do you think is causing that.
Scott For model number LSY140 - May 14, 2023

Hello Scott, thank you for your question. This sounds like the Gear Assembly N498091. We hope this helps.

eReplacementParts Team
May 14, 2023

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Customer Repair Instructions

All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.

Easy 

15 - 30 mins 

(47 rated repairs) ?
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Sorry, we couldn't find any existing installation instruction that matched.

Would no longer spin and spindle was very loose in housing.

Tim from Fresno, California

29 of 29 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
N498091, 90615074
Not sure that I needed both Motor Housing Assy and Gear and Spindle but I ordered both parts just in case. When I received the parts I compared mine to the new parts and found the gears were worn down so they were not touching the internal gear to make the spindle spin. I also found the plastic housing had melted somewhat where the spin dle rested which caused it to be loose. I used both replacement parts and was glad I did, it now works like new. This was an easy replacement just remove screws change out parts and replace with the same screws.
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String line would feed out constantly until it was all gone.

John from Carlinville, Illinois

26 of 26 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Pliers
Parts Used:
N498091
I followed the advice on this page. The descriptions of problems made it easy to select the right parts. Rather than replace my trimmer, a $2.97 part saved the day. The website said that it was a common problem with this particular trimmer and recommended that I order a spare. I did. Very pleased start to finish.
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Motor housing and spindle wore out because of grass built up around shaft

ann from moncks corner, South Carolina

14 of 14 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
N498091, 90615074
1 Removed edger guide and safety shield
2 Removed screws in motor housing to split case
3 Removed motor and spindle assembly from old housing
4 Put motor and new spindle into new housing
5.Reassembled housing, safety shield, and edger guide

Note,,,,, be careful to route wires to avoid pinching them whe n assembling two halves of housing.
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Long stringy weeds got pulled in and spun around the gear assembly. The housing melted. This is second time this happened.

jennifer from Amissville, Virginia

11 of 11 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
30 - 60 mins
Tools:
Pliers, Screw drivers
Parts Used:
N498091, 90615074
Unscrewed all screws and opened housing. Unscrewed the screws holding the motor in place. Replaced the gear. Screwed the wires to the motor. Had to do this twice because the wires were not tucked in properly the first time. Make sure the handle is going the right way too. My only complaint is new screws were not supplied. Some of the old ones had stripped due to being stuck tight with crud. The price to replace these two parts is a no brainer compared to buying a new trimmer.
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Trimmer head would not engage with motor drive gear

Harold from ROCKVILLE, Maryland

7 of 7 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers
Parts Used:
N498091, 90615074
Replaced both the motor housing assembly and the Gear and spindle assembly.
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Spool wore out housing assembly then teeth on spool to much play

Danny from ofallon, Missouri

7 of 7 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
N498091, 90615074
Remove the screws from the motor housing assembly and separate housing and remove guard. Remove worn gear and spindle. Install new spindle and gear. Assemble motor housing and guard in reverse order.
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Long grass had wrapped around the gear assembly shaft, got hot and melted the motor housing bearing holder. With no solid support the gear assembly misaligned and the metal motor gear shaved off much

John from Chehalis, Washington

5 of 5 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
N498091, 90570298N
1. Remove the string guard
2. Remove all screws holding the damaged motor housing together.
3. Pry off one half of the damaged housing to expose the motor and gear assembly.
4. Remove the gear assembly from the other half of the damaged motor housing.
5. Remove two screws from the motor power cord hold down plate t o free the motor cord from the damaged motor housing assy.
6. Remove the other half of the damaged housing to expose the motor.
7. Place the motor into the new motor housing half.
8. Secure the motor power cord in the new housing by screwing the motor power cord hold down plate.
9. Insert the new gear assembly into the new motor housing assembly half
10. Place the remaining new half over the motor and gear assembly.
11. Make sure you have the head rotation release button positioned properly
12. Screw the two motor housing halves together
13. Replace the string guard.
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Over a period of time grass and vines had wrapped around the spindle shaft causing downward pressure between the spindle assembly and the gear housing. This pressure generated heat melting the plasti

Rex from THOMASVILLE, Alabama

3 of 3 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Screw drivers
Parts Used:
N498091, 90615074
1. Removed the damaged housing and spindle/gear assembly.
2. Installed the new housing and spindle/gear assembly.
3. Verified the tightness of all screws.
4. Performed about 30 minutes of weed eating to verify everything works fine.
Note: These parts appear to be OEM and therefore perfect replacement parts. I\'ve now used my repaired weed eater/trimmer for several hours. I works like brand new. I have 6 power settings and only use it on the lowest setting (1). I have used it on setting 6 a couple of times but is just a waste of power and runs down the batter a lot quicker than setting 1. I can get about an hour out of the battery on setting 1 on normal grass, otherwise about 30 minutes if the grass/weeds and tough and super tough. Most importantly is making sure the long strands of grass and vines don\'t wrap around the spindle assembly - which is what eventually caused the failure of the original product. I was really amazed at the reasonable price of these parts given how expensive the electric weed trimmer is. I usually run the battery powered 40Volt weed trimmer for about 1 hour per week on average. I am pleased with the repairs using these parts and would do it again.
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Motor housing worn out and gear stripped

JOSEPH from STONEWALL, Mississippi

2 of 2 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
N498091, 90615074
Removed old motor housing and stripped gear. Replaced with new housing and gear. Everything fit like OEM parts. No problems,very impressed .

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Gears were overloaded and worn smooth and out of alignment.

RONALD from REMER, Minnesota

2 of 2 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Screw drivers
Parts Used:
N498091, 90615074
Opened the motor housing assembly...it was very obvious what needed to be replaced...ordered the parts.....they arrived in 4-5 business days....replaced and reassembled unit and fired that baby up! perfect!
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Model Cross Reference

This part works with the following models:
ERP Number: ERP18994000
Manufacturer Part Number: N498091
Brand Model Number Description
Craftsman CMCST98020E1 Trimmer - 40v Max Li-Ion Strin
Black and Decker LST140C Trimmer - 40v Lith String Trim