Bosch ALR 900 User Manual

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Robert Bosch GmbH

Power Tools Division

70745 Leinfelden-Echterdingen

Germany

www.bosch-pt.com

F 016 L70 480 (2008.10) O / 15 XXX

ALR 900 | AVR 1100

en Original instructions

OBJ_DOKU-14727-002.fm Page 1 Friday, October 10, 2008 11:35 AM

Table of Contents

Other manuals for Bosch ALR 900

Operating Instructions171 pages

Questions and Answers:

O
omaddoxJul 26, 2025
Why my Bosch ALR 900 Lawn Mower functions intermittently?
- J
  Jody KingJul 26, 2025
  If your Bosch Lawn Mower functions intermittently, the possible causes include a damaged extension cable (inspect and replace if needed), damaged internal wiring (contact a service agent), worn or missing tines/blades (for ALR 900, fit a replacement; for AVR 1100, contact a service agent), wet conditions (increase the height of cut), too much debris on the ground, possible clogging (check underneath the machine and clear, wearing gardening gloves), raking/verticutting too low (increase height of cut), grass too long (cut the grass), a very uneven surface (increase height of cut), or a full grassbox (empty it regularly).
D
Dr. Cynthia MccoyAug 1, 2025
How to improve poor collection of my Bosch Lawn Mower?
- S
  sextonchristopherAug 1, 2025
  If you experience poor collection with your Bosch Lawn Mower, it could be due to raking/verticutting in wet conditions (increase the height of cut), raking/verticutting too low for the conditions (increase the height of cut), possible clogging (check underneath the machine and clear out as necessary, always wear gardening gloves), blocked side grilles (clear debris from the outside of the side grilles), or missing tine springs (for ALR 900 only, replace tine springs, always wear gardening gloves).
T
Tracey HernandezAug 6, 2025
What to do if my Bosch ALR 900 Lawn Mower fails to operate?
- C
  Cody FuentesAug 7, 2025
  If your Bosch Lawn Mower fails to operate, several factors could be at play. First, ensure the power is turned on. Check if the mains socket is faulty, and if so, use another socket. Inspect the extension cable for damage and replace it if needed. Also, verify if the fuse is faulty or blown and replace it. Clogging might be the issue, so check underneath the machine and clear any obstructions, wearing gardening gloves. For AVR 1100 models, the motor protector might be activated. If the raking/verticutting is too low, increase the height of cut. Clear any obstruction from the rotor, wearing gardening gloves, and remove any debris from the side grilles. Finally, ensure the grassbox isn't full and empty it regularly.
H
Heather GreenAug 13, 2025
Why my Bosch ALR 900 labours or belt squeals?
- J
  jonathanryanAug 13, 2025
  If your Bosch Lawn Mower labours or the belt squeals, it could be due to the height of cut being too low (increase the height of cut), cutting tines/blades not rotating due to grass obstruction (clear the obstruction, always wear gardening gloves), or a slipping or damaged belt (contact a service agent).
A
Amber ClarkAug 18, 2025
What causes excessive vibrations/noise in my Bosch ALR 900 Lawn Mower?
- T
  Tara RodriguezAug 18, 2025
  Excessive vibrations or noise in your Bosch Lawn Mower can be attributed to damaged cutting tines or blades. For ALR 900 models, fit a replacement. For AVR 1100 models, contact a service agent.

Bosch ALR 900 Specifications

General

Type	Push lawn mower
Power	900 W
Cutting width	320 mm
Cutting system	-
Removable tray	Yes
Recommended lawn area	- m²
Grass collecting volume	50 L
Power source	AC
Cordless	No

Weight and Dimensions

Weight	9400 g

Summary

Safety Warnings and Machine Identification

General Hazard Safety Symbols

Explanation of standard safety warning symbols used on the machine.

Assembly and Setup Instructions

Handlebar Assembly

Step-by-step guide for assembling the machine's handlebars.

Grassbox Assembly and Fitting

Operation and Component Details

Starting the Lawnraker/Verticutter

Procedures for safely starting the ALR 900 and AVR 1100.

Safety Notes and Precautions

Explanation of Safety Symbols

Detailed explanation of the safety symbols found on the machine.

Safe Operating Practices

Essential guidelines for the safe and correct operation of the equipment.

Operational Safety and Maintenance Advice

Safety for Slope Operation

Power Cable Handling and Safety

Electrical Safety and Assembly Procedures

Electrical Safety Guidelines

Information on power supply, extension cables, and safety devices.

Product Assembly Steps

Adjusting the Cutting Height

Operating the Machine: Start, Stop, and Tips

Starting and Stopping Instructions

Step-by-step guide for safely starting and stopping the machine.

Raking and Verticutting Operation

Troubleshooting Common Issues

Machine Fails to Operate

Diagnostic steps for when the machine does not turn on.

Intermittent Machine Operation

Troubleshooting common causes for the machine stopping or malfunctioning.

Troubleshooting, Maintenance, and Tine Service

Machine Labouring or Belt Issues

Maintenance and Cleaning Schedule

Raker Tine Removal and Installation

Detailed guide for replacing the raker tines.

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