Stihl RM 248.3 User Manual (English)

Questions and Answers:

T
Timothy CarsonAug 7, 2025
How to start a Stihl RM 248.3 when it won't start?
- C
  Charles BatesAug 8, 2025
  If your Stihl Lawn Mower engine won't start, several factors could be the cause. Make sure the control bar for mowing is pressed, as the engine starts as described in this instruction manual. Check that the fuel tank isn't empty and refuel if necessary. Also, ensure the fuel line isn't blocked. Using fresh, good-quality unleaded petrol is important. A dirty air filter can also prevent starting, so clean or replace it as described in the engine instruction manual. Verify the spark plug socket is connected and the spark plug isn't dirty or damaged and adjust electrode gap. If the blade meets too much resistance, set a higher cutting height or start the engine in lower grass.
K
Katrina RichmondAug 14, 2025
Why is my Stihl RM 248.3 engine difficult to start and overheating?
- P
  Patrick LyonsAug 14, 2025
  If your Stihl Lawn Mower engine is hard to start, losing power, or overheating, the lawn mower housing might be blocked, so clean it. The cutting height might be too low, or the feed rate too high; adjust the cutting height or mow more slowly. Water or blockage in the fuel tank and carburettor can also cause issues; empty the fuel tank and clean the fuel line and carburettor. A dirty air filter or spark plug can also be responsible; clean or replace them. Ensure the engine oil level is correct, adding or changing oil as described in the engine instruction manual. Finally, check if the cooling ribs are dirty and clean them if needed.
J
Jonathan FreemanAug 22, 2025
Why is my Stihl RM 248.3 not cutting grass cleanly?
- N
  Nathan BarronAug 22, 2025
  If your Stihl Lawn Mower isn't cutting grass cleanly, the blade may be blunt or worn. Sharpen or replace the blade to resolve this issue.
L
Lorraine GambleAug 30, 2025
What to do if my Stihl RM 248.3 vibrates excessively?
- S
  Sheila JohnsonAug 31, 2025
  Excessive vibration in your Stihl Lawn Mower can be due to a damaged blade, which should be replaced. Another cause could be that the blade is not correctly attached; in that case, attach the blade correctly.

Stihl RM 248.3 Specifications

General

Brand	Stihl
Model	RM 248.3
Category	Lawn Mower
Language	English

Summary

Guide to Using this Manual

2.1 Applicable Documents

Manual is a translation of original instructions.

2.2 Warning Notices in Text

Explains DANGER notices for fatal injury risks.

Overview

3.1 Lawn Mower

Identifies parts of the lawn mower with numbered labels.

Safety Precautions

4.1 Warning Symbols

Explains warning symbols on the lawn mower.

4.2 Intended Use

Defines the STIHL RM 248.3/RM 253.3 lawn mower's purpose.

4.3 Requirements for the User

Outlines user qualifications and responsibilities for safe operation.

4.4 Clothing and Equipment

Recommends appropriate clothing and safety gear for operating the mower.

4.5 Work Area and Surroundings

Advises on safe work area practices and environmental considerations.

4.6 Safe Condition

Details the conditions for the lawn mower to be in a safe state.

4.7 Fuel and Refuelling

Provides instructions and warnings for refueling the lawn mower.

4.8 Working

Offers guidance on safe operation and potential risks during mowing.

4.9 Transporting

Gives instructions on how to safely transport the lawn mower.

4.10 Storing

Provides guidelines for properly storing the lawn mower.

Preparing the Lawn Mower for Operation

5.1 Preparing the Lawn Mower for Operation

Lists essential steps before starting work with the lawn mower.

Assembling the Lawn Mower

6.1 Assembling, Attaching and Detaching the Grass Catcher Box

Details how to assemble, attach, and detach the grass catcher box.

6.2 Removing and Inserting the Mulch Insert

Explains how to remove and insert the mulch insert.

6.3 Attaching and Detaching the Extension

Provides instructions for attaching and detaching the extension.

Refuelling the Lawn Mower

7.1 Refuelling the Lawn Mower

Step-by-step guide for refueling the lawn mower safely.

Adjusting the Lawn Mower for the User

8.1 Folding Up the Handlebar

Instructions on how to fold up the handlebar for storage or transport.

8.2 Folding the Handlebar

Details how to fold the handlebar for space-saving storage or transport.

8.3 Adjusting the Handlebar

Explains how to adjust the handlebar to the user's preference.

Starting and Stopping the Engine

9.1 Starting the Engine

Guides on how to start the lawn mower's engine.

Checking the Lawn Mower

10.1 Checking the Controls

Instructions for checking the lawn mower's control functions.

10.2 Checking the Blade

Steps for inspecting the lawn mower's blade for wear and damage.

Operating the Lawn Mower

11.1 Holding and Guiding the Lawn Mower

Guidance on how to properly hold and steer the lawn mower.

11.2 Setting the Cutting Height

Instructions on how to adjust the cutting height of the lawn mower.

11.3 Mowing and Mulching

Explains the dual functionality of mowing and mulching.

11.4 Emptying the Grass Catcher Box

Guides on how to empty the grass catcher box.

After Finishing Work

12.1 After Finishing Work

Steps to take after completing the mowing task.

Transporting

13.1 Transporting the Lawn Mower

Provides instructions for safely transporting the lawn mower.

Storing

14.1 Storing the Lawn Mower

Details the steps for storing the lawn mower correctly.

14.2 Storage Position

Explains how to position the lawn mower for space-saving storage.

Cleaning

15.1 Upending the Lawn Mower

Instructions for safely upending the lawn mower for cleaning.

15.2 Cleaning the Lawn Mower

Step-by-step guide for cleaning the lawn mower.

Maintenance

16.1 Maintenance Intervals

Outlines recommended maintenance intervals for the engine and mower.

16.2 Removing and Attaching the Blade

Instructions for safely removing and attaching the lawn mower blade.

16.3 Sharpening and Balancing the Blade

Guidance on sharpening and balancing the mower blade.

Repairing

17.1 Repairing the Lawn Mower

Advises against self-repair and recommends consulting a specialist.

Troubleshooting

18.1 Remedy Lawn Mower Faults

Provides a table to diagnose and resolve common lawn mower issues.

Specifications

19.1 Lawn Mower STIHL RM 248.3, RM 253.3

Lists technical specifications for the STIHL RM 248.3 and RM 253.3 lawn mowers.

19.2 Blade

Details blade specifications like thickness, width, and sharpening angle.

19.3 Sound Values and Vibration Values

Provides sound pressure and vibration level data for the models.

Spare Parts and Accessories

20.1 Spare parts and accessories

Recommends using original STIHL spare parts and accessories.

20.2 Essential Spare Parts

Lists essential spare parts for the lawn mower.

Disposal

21.1 Disposing of the Lawn Mower

Guides on environmentally responsible disposal of the lawn mower.

EC Declaration of Conformity

22.1 Lawn Mower STIHL RM 248.3, RM 253.3

Declares compliance with relevant EC directives for the lawn mower.

UKCA Declaration of Conformity

23.1 Lawn Mower STIHL RM 248.3, RM 253.3

Declares compliance with relevant UK regulations for the lawn mower.

Addresses

www.stihl.com

Website for STIHL product information and support.

Related product manuals

Stihl RM 248.3 User Manual

Table of Contents

Questions and Answers:

Stihl RM 248.3 Specifications

Summary

Guide to Using this Manual

2.1 Applicable Documents

2.2 Warning Notices in Text

Overview

3.1 Lawn Mower

Safety Precautions

4.1 Warning Symbols

4.2 Intended Use

4.3 Requirements for the User

4.4 Clothing and Equipment

4.5 Work Area and Surroundings

4.6 Safe Condition

4.7 Fuel and Refuelling

4.8 Working

4.9 Transporting

4.10 Storing

Preparing the Lawn Mower for Operation

5.1 Preparing the Lawn Mower for Operation

Assembling the Lawn Mower

6.1 Assembling, Attaching and Detaching the Grass Catcher Box

6.2 Removing and Inserting the Mulch Insert

6.3 Attaching and Detaching the Extension

Refuelling the Lawn Mower

7.1 Refuelling the Lawn Mower

Adjusting the Lawn Mower for the User

8.1 Folding Up the Handlebar

8.2 Folding the Handlebar

8.3 Adjusting the Handlebar

Starting and Stopping the Engine

9.1 Starting the Engine

Checking the Lawn Mower

10.1 Checking the Controls

10.2 Checking the Blade

Operating the Lawn Mower

11.1 Holding and Guiding the Lawn Mower

11.2 Setting the Cutting Height

11.3 Mowing and Mulching

11.4 Emptying the Grass Catcher Box

After Finishing Work

12.1 After Finishing Work

Transporting

13.1 Transporting the Lawn Mower

Storing

14.1 Storing the Lawn Mower

14.2 Storage Position

Cleaning

15.1 Upending the Lawn Mower

15.2 Cleaning the Lawn Mower

Maintenance

16.1 Maintenance Intervals

16.2 Removing and Attaching the Blade

16.3 Sharpening and Balancing the Blade

Repairing

17.1 Repairing the Lawn Mower

Troubleshooting

18.1 Remedy Lawn Mower Faults

Specifications

19.1 Lawn Mower STIHL RM 248.3, RM 253.3

19.2 Blade

19.3 Sound Values and Vibration Values

Spare Parts and Accessories

20.1 Spare parts and accessories

20.2 Essential Spare Parts

Disposal

21.1 Disposing of the Lawn Mower

EC Declaration of Conformity

22.1 Lawn Mower STIHL RM 248.3, RM 253.3

UKCA Declaration of Conformity

23.1 Lawn Mower STIHL RM 248.3, RM 253.3

Addresses

www.stihl.com

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