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MTD YARD-MAN YM21CS - User Manual

MTD YARD-MAN YM21CS
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IMPORTANT: READ THE OPERATOR’S MANUAL THOROUGHLY AND FOLLOW THE SAFE OPERATION PRACTICES WHILE OPERATING THE UNIT.
Removing Unit From Carton
A
ssemble The Unit
Starting The Unit
S
lide shield’s slot onto
m
ounting bracket. Rotate
shield onto shaft. Push
square bolt through shield
and bracket. Tighten
washer and wing nut
o
nto bolt.
Remove cap from lower
boom. Push cutting
attachment into coupler.
Turn coupler knob clockwise
to tighten.
Assemble The Unit
Mix thoroughly in separate
fuel can:
3.2 fl. oz. of 2-cycle
e
ngine oil
1 gallon of unleaded
gasoline
NOTE: Do not mix directly in
fuel tank.
Place unit on a level surface.
F
ill fuel tank.
Press primer bulb 10 times,
o
r until fuel is visible
Crouch in starting position. SQUEEZE and HOLD
throttle for ALL further
steps.
Pull rope 5 times. Move choke lever to
Position 2 and squeeze
throttle.
Pull rope 3-5 times to start
engine. Run unit for 30-60
seconds to warm up.
Continue to squeeze
throttle. Move choke lever
to Position 3.
11 2
Remove all contents from
carton.
5 6 7
19 10
3
Put D-handle on shaft. Move
handle a minimum 6 inches
away from shaft grip. Insert
clamp bolt and tighten the
wing nut.
Move choke lever to
P
osition 1.
Continue to squeeze
throttle. Run unit for an
additional 60 seconds to
complete warm-up. Unit
may be used during this
time.
8
4
S
tarting The Unit
11
12
13
14
1
5
Primer
Bulb
1
0 X
5 X
3-5 X
Choke Lever
Starter Rope
Fuel Cap
Throttle Control
O
n/ Off Switch
D
-Handle
E
z-Link™
Cutting Head Shield
Need Help?
Call 1-800-800-7310
DIDN’T START?
Repeat these instructions.
IF engine fails to start after 2 attempts,
move choke lever to position 3 and pull
t
he starter rope until engine starts
IF unit still fails to start, refer to the
o
perator’s manual for additional starting
and troubleshooting information
1
Gallon 3.2 oz
4
0:1
Choke Lever
Choke Lever
Slot
Bracket
Min. 6"
N
O ASSEMBLY TOOLS REQUIRED
Bump
Knob
Inner
Reel
Outer
Spool
Spring
Top Hole
Bottom Hole
Split Wall
Unscrew the bump knob
counterclockwise.
Remove the inner reel and
spring.
Cut one 6-foot (1.8 m) length
of new 0.095” split line
trimming line. Split each end
about 6 inches (150 mm).
Insert the end of one line into
the top hole and the end of
the other line into the bottom
hole.
Wind the line tightly in the
direction shown on the inner
reel. The split wall will divide
the line. Wind the line until it
is completely divided and
about 6 inches (150 mm) of
line remains.
Insert the two 6-inch sections
into the two .095 holding
slots.
11 2
Pass the two line ends
through the eyelets. Place the
spring inside the inner reel.
Insert the inner reel into the
outer spool. Push the inner
reel and outer spool together.
Reloading the Line*
3
4
5
6
7
Hold the inner reel and outer
spool together. Firmly pull the
two line ends to release them
from the holding slots. Screw
the bump knob on clockwise.
Tighten the bump knob
securely.
18
For replacement line, call 1–800-800-7310 or go to
an authorized service dealer.
For single line installation or replacement spool
installation instructions, refer to the Replacing the
Trimming Line section of this manual.
*This is to assist in the reloading of Splitline® only. These instructions
are NOT part of the fast assembly instructions. Line does not need to
be installed on the initial assembly and start-up.
Reloading the Line
Holding Slots
Eyelets
769-07511 P00 11/11
NEED HELP? CALL 1-800-800-7310 IN U.S. OR 1–800–668–1238 IN CANADA
YM21CS
2-Cycle Trimmer
Operator’s Manual
Español — Page 11 English — Page 1Français — Page 6

Questions and Answers

  • K
    Kyle RussellAug 5, 2025
    Why won't my MTD Trimmer engine start?
    • N
      natasha27Aug 5, 2025
      Several factors can prevent your MTD Trimmer engine from starting: * The fuel tank might be empty, in which case you should fill it with properly mixed fuel. * You may not have pressed the primer bulb enough; try pressing it 10 times or until fuel is visible. * The engine could be flooded; with the choke lever in position 3, squeeze the trigger and pull the starter rope. * The fuel might be old (over 30 days) or improperly mixed; drain the tank and add fresh, properly mixed fuel. * There could be a fouled spark plug; replace or clean it.
  • D
    Deanna CooleyAug 9, 2025
    What to do if my MTD YARD-MAN YM21CS engine lacks power or stalls?
    • D
      Debra MunozAug 9, 2025
      If your MTD Trimmer engine lacks power or stalls, it could be due to: * Old or improperly mixed fuel (over 30 days old). Drain the fuel tank and add fresh, properly mixed fuel. * A fouled spark plug. Replace or clean the spark plug.
  • L
    Leonard RogersAug 15, 2025
    How to fix MTD YARD-MAN YM21CS Trimmer engine that will not idle?
    • L
      Lisa GarciaAug 15, 2025
      If your MTD Trimmer engine won't idle, there are a few things you can check: * The air filter might be plugged. Try replacing or cleaning it. * The fuel could be old (over 30 days) and/or improperly mixed. In this case, drain the fuel tank and add fresh, properly mixed fuel. * The idle speed may be improper. You can try adjusting the idle speed.
  • S
    Sharon StokesAug 20, 2025
    Why MTD YARD-MAN YM21CS Trimmer engine will not accelerate?
    • S
      Sean WardAug 20, 2025
      If your MTD Trimmer engine will not accelerate, consider these potential causes: * The fuel is old (over 30 days) and/or improperly mixed. Solution: Drain the fuel tank and add fresh, properly mixed fuel. * The cutting head is bound with grass. Solution: Stop the engine and clean the cutting head. * The air filter is dirty. Solution: Clean or replace the air filter.
  • C
    christopheradamsAug 25, 2025
    What to do if cutting head will not advance line on my MTD Trimmer?
    • J
      James BarrettAug 25, 2025
      If the cutting head of your MTD Trimmer won't advance the line, it might be because: * The cutting head is bound with grass: Stop the engine and clean the cutting head. * The cutting head is out of line: Refill with new line. * The inner reel is bound up: Clean the inner reel and outer spool. * The cutting head is dirty: Disassemble, remove the welded section, and rewind.
  • A
    Andrea WhiteAug 29, 2025
    What causes the cutting line to advance uncontrollably on my MTD YARD-MAN YM21CS Trimmer?
    • C
      Cheyenne FoxAug 29, 2025
      If the cutting line on your MTD Trimmer advances uncontrollably, it's likely due to oil, cleaner, or lubricant being present in the cutting head. To resolve this, clean and thoroughly dry the cutting head.

Summary

FastGuide Assembly and Starting

Removing Unit From Carton

Initial step to take all contents from carton.

Assemble The Unit

Step-by-step guide to assemble the trimmer components.

Starting The Unit

Instructions for priming, choking, and starting the engine.

Troubleshooting Starting Issues

Guidance for when the unit fails to start after attempts.

Reloading Trimming Line

Procedures for adding new trimming line to the cutting head.

Service and Safety Information

Obtaining Service and Support

Contact details and procedures for warranty service and assistance.

General Safety Rules

Key safety instructions for operating the trimmer.

Precautions After Use

Steps to take after finishing operation for safe storage.

Additional Safety Precautions

Further warnings and safety guidelines for operation.

Safety Symbol Explanations

Meaning of safety symbols and pictographs used in the manual.

Unit Overview and Assembly

Unit Applications

Describes the various uses of the trimmer.

Fuel and Oil Information

Guidelines for using blended fuels, additives, and fueling the unit.

Assembly Instructions

Steps to install the cutting attachment shield and D-handle.

EZ-Link System

Instructions for operating, installing, and removing EZ-Link™ system add-ons.

Operation and Maintenance

Proper Unit Holding Technique

How to hold the unit correctly for safe and effective operation.

Adjusting Line Length

Methods for extending trimming line during operation.

Trimming Best Practices

Tips for efficient cutting and optimal results.

Replacing Trimming Line

Detailed steps for replacing line in the cutting head.

Air Filter Care

Instructions for cleaning and maintaining the air filter.

Idle Speed Adjustment

How to adjust the engine idle speed for proper operation.

Maintenance, Troubleshooting, and Specs

Replacing the Spark Plug

Procedure for removing, checking, and installing a new spark plug.

Cleaning and Storage

Guidelines for cleaning the unit and preparing it for storage.

Troubleshooting Engine Issues

Solutions for common problems like no start, idle, or power.

Troubleshooting Cutting Head

Solutions for problems with line advancement and control.

Product Specifications

Lists key technical specifications like engine type, displacement, and dimensions.

Manufacturers Limited Warranty

Warranty Service and Obtaining Help

How to obtain warranty service and locate dealers.

Warranty Exclusions

Conditions and parts not covered by the limited warranty.

Legal Disclaimers and State Law

Information on implied warranties, liability, and state-specific rights.

MTD YARD-MAN YM21CS Specifications

General IconGeneral
BrandMTD
ModelYARD-MAN YM21CS
CategoryTrimmer
LanguageEnglish

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