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Model # L21ZSNC Official Lawn-Boy walk-behind lawn mower
Here are the diagrams and repair parts for Official Lawn-Boy L21ZSNC walk-behind lawn mower, as well as links to manuals and error code tables, if available.
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L21ZSNC Walk-Behind Mowers
#13
Drive group diagram
Spring
Part #613879
Replaced by #613879
?
Manufacturer substitution
This part replaces 613879. Substitute parts can look different from the original.
$29.04
In Stock
#47
Engine group diagram
Switch kit
Part #683968
Replaced by #93-4307
?
Manufacturer substitution
This part replaces 683968. Substitute parts can look different from the original.
$64.69
In Stock
#NI
All parts diagram
Repair kit
Part #683777
Replaced by #683777
?
Manufacturer substitution
This part replaces 683777. Substitute parts can look different from the original.
$15.29
In Stock
#41
Engine group diagram
Screw
Part #307028
Replaced by #614343
?
Manufacturer substitution
This part replaces 307028. Substitute parts can look different from the original.
This item is not returnable
$5.57
In Stock
#NI
All parts diagram
Bag
Part #684333
Replaced by #100-6362
?
Manufacturer substitution
This part replaces 684333. Substitute parts can look different from the original.
$217.11
In Stock
#7
Starter group diagram
Pulley
Part #612950
Replaced by #612950
?
Manufacturer substitution
This part replaces 612950. Substitute parts can look different from the original.
$37.71
In Stock
#11
Handle group diagram
Control cable
Part #683943
Replaced by #683943
?
Manufacturer substitution
This part replaces 683943. Substitute parts can look different from the original.
$144.78
In Stock
#10
Housing and shroud group diagram
Screw
Part #607809
Replaced by #614677
?
Manufacturer substitution
This part replaces 607809. Substitute parts can look different from the original.
This item is not returnable
$7.26
In Stock
#4
Starter group diagram
Clip rope
Part #612824
Replaced by #612824
?
Manufacturer substitution
This part replaces 612824. Substitute parts can look different from the original.
This item is not returnable
$7.11
In Stock
#6
Carburetor group diagram
Throttle spring
Part #613142
Replaced by #613142
?
Manufacturer substitution
This part replaces 613142. Substitute parts can look different from the original.
$13.06
In Stock
Symptoms for gas walk-behind mowers
Choose a symptom to see related walk-behind mower repairs.
Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…
Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…
Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…
Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…
Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…
Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…
Repair guides for gas walk-behind mowers
These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.
How to rebuild a lawn mower carburetor
The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…
Repair difficulty
Time required
60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine
Replace the recoil starter if it doesn't move when you pull the starter rope.…
Repair difficulty
Time required
15 minutes or less
How to replace a lawn mower wheel
Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…
Repair difficulty
Time required
15 minutes or less
Effective articles & videos to help repair your walk-behind mowers
Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.
Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…
Get answers to frequently asked questions about Sears and Sears PartsDirect.…
Learn about the different kinds of mower blades and how to maintain them.…