Ariens LM21SC User Manual

24 pages

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Owner/Operator Manual

Models

911511 - LM21SC

911513 - LM21

911514 - LM21S

911515 - LM21SE

911516 - LM21SW

Walk Behind Lawn Mower

01192700A 11/00

Printed in USA

ENGLISH

FRANÇAIS

ESPAÑOL

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Questions and Answers:

T
Tiffany DicksonAug 4, 2025
Why won't my Ariens LM21SC Lawn Mower engine start?
- K
  Kevin HowardAug 5, 2025
  If your Ariens Lawn Mower engine won't start, several factors could be the cause. First, check the fuel level and fill the tank if it's empty or low. Next, verify the spark plug wire connection. Also, inspect the engine/brake control cable for any detachment, breakage, or improper adjustment, and adjust, repair, or replace it as needed. Finally, for electric start models, ensure the battery is charged or replace it if necessary.
T
tara72Aug 19, 2025
What to do if self-propelled drive does not engage on Ariens Lawn Mower?
- R
  Robert JonesAug 19, 2025
  If the self-propelled drive on your Ariens Lawn Mower isn't engaging, start by ensuring the traction drive bail is engaged. Check the drive belt to see if it's out of position and adjust it if necessary. Also, inspect the drive belt for wear or damage and replace it if needed. Make sure the rear wheels are in the same cutting height positions. Adjust or replace the friction wheel if its engagement is not adjusted properly or damaged. Check the idler and spring, and adjust as necessary. Finally, check the drive cable and adjust, repair, or replace it if required.

Ariens LM21SC Specifications

General

Brand	Ariens
Model	LM21SC
Category	Lawn Mower
Language	English

Summary

Controls and Features Overview

Component Identification

Lists and diagrams identifying the various controls and features of the mower.

Introduction and Preparation

Manual Guidance

Guidance on how to read and understand the manual's contents.

Service and Replacement Parts

Information on identifying and ordering replacement parts.

Product Registration and Policy

Details on completing registration, unauthorized parts, and dealer delivery.

Safety Precautions and Practices

Safety Alerts and Symbols

Explanation of safety symbols and signal words used in the manual.

Safe Working Practices and Laws

Guidance on safe working practices and adherence to local laws.

Operator Training Requirements

Ensuring proper training for all operators of the unit.

Safety Decals and Rules

Safety Decal Locations

Identifying the locations of important safety decals on the mower.

Operational Safety Rules

Rules for safe operation, including handling discharge and guards.

Service and Adjustments Introduction

Battery Precautions

Precautions and information related to the mower's battery.

General Maintenance Guidelines

General maintenance guidance and adherence to engine manufacturer's instructions.

Assembly Instructions

Unpacking the Mower Unit

Instructions for safely removing the mower from its shipping carton.

Mower Component Assembly

Detailed steps for assembling the mower components after unpacking.

Mower Operation

Controls and Features Explanation

Detailed explanations of how to use the mower's controls and features.

Handlebar Adjustment

Instructions for adjusting the handlebar to a comfortable position.

Cutting Height Adjustment (Standard Models)

How to adjust the cutting height on standard models.

Optional Controls

Swivel Wheel Cutting Height Adjustment

Adjusting cutting height specifically for swivel wheel models.

Engine Starting Controls

Using primer bulb, throttle/choke, and ignition switch for starting.

Variable Speed and Drive Control

Using speed selector and wheel drive control for self-propelled operation.

Fueling and Mower Configurations

Fuel Tank Filling Procedure

Step-by-step instructions for safely adding fuel to the mower's tank.

Mower Configuration Options

Instructions for configuring the mower for bagging, side discharge, or mulching.

Emergency Stopping Procedure

Procedure for stopping the mower quickly in an emergency situation.

Starting, Shutting Off, and Mowing Tips

Manual Engine Starting

Step-by-step guide for starting the engine using the manual recoil starter.

Electric Engine Starting

Step-by-step guide for starting the engine using the electric starter.

Engine Shut Off Procedure

Procedure for safely shutting off the mower's engine.

Effective Mowing Techniques

Tips for safe and effective mowing, including slope handling and debris clearing.

Maintenance Schedule and Checks

Recommended Maintenance Schedule

Recommended schedule for performing regular maintenance tasks.

Air Cleaner and Engine Oil Checks

Instructions for checking and maintaining the air cleaner and engine oil.

Mower Blade and Drive Component Checks

Inspecting mower blade, drive belt, engine/blade control, and drive control.

Other Maintenance Checks

Checking fasteners, spark plug, engine cooling, and muffler.

Service and Adjustments

Service Position and Handlebar Adjustment

Safe tipping for service and adjusting the handlebar height.

Battery Charging

Instructions for charging the battery on electric start models.

Engine/Blade Control and Drive System Adjustments

Adjusting engine/blade control, drive belt, and wheel drive systems.

Storage Procedures

Cleaning and Inspection Before Storage

Instructions for cleaning and inspecting the mower before storage.

Component Storage Guidelines

Proper storage procedures for the grass bag, battery, and engine.

Troubleshooting and Parts Information

Troubleshooting Common Issues

Common causes and corrections for engine start and drive engagement issues.

Service Parts and Accessories

List of genuine Ariens service parts and optional accessories.

Specifications

Warranty Information

Warranty Coverage Details

Details on warranty coverage, limitations, exclusions, and remedies.

Warranty Disclaimers

Ariens' disclaimer of warranties beyond those expressly stated.

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