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The RoboMower is a line of robotic lawn mowers manufactured by Friendly Robotics. They run off a 24-volt rechargeable battery pack and use three mulching blades. A perimeter switch powers a loop of wire placed around the yard to provide a boundary for the mower.

Operating manuals for the current models are available on the Friendly Robotics web site. Although the manufacturer does not supply repair information to the general public, we have Troubleshooting and Repair pages with information collected, created, or discovered by RoboMower users.

Here are some photos and notes to take apart a RoboMower.

RoboMower Models and Differences

Photo/Model Release Year Color(s) Suggested Yard Size Features/Upgrade Options/Notes
RS 630
2013 Green 32,000ft², 3000m² New design top of the line model. First Robomow to use a lithium battery. Uses two newly designed blades. Has user replaceable drive and cutting motors. Handles a much larger lawn size specified even though the run time is rated at only 1.5 hours versus 3.3 hours for the other models.
RL510 2011 Green 5,400ft², 500m² Newer replacement for the RL400.
RL2000 2010 Green 10,800ft², 1,000m² Newer replacement for the RL100.
RL855 2010 Yellow 10,800ft², 1,000m² Newer replacement for the RL850. It's pretty much the same as the RL1000 but doesn't come with a docking station.
RL200 / RL400 2008? Green Smaller model for smaller lawns. Uses a single blade.
2004 (yellow), 2005 (green) Yellow, Green 21,500ft², 2,000m² Comes with docking station for automatic mowing departure and charging according to programmed schedule.
2004 (yellow), 2005 (green) Yellow, Green 10,800ft², 1,000m² Sixth generation mower. More software improvements. Upgradable with a docking station.
2003 [1] Yellow 4,800ft², 450m² [2] Fifth generation mower. Further improved water-resistance and software.
2002 [3] Yellow 6,500ft², 600m² Fourth generation mower. Controller updated to be completely water-proof.
Toro iMow
2000 Red The iMow was a red version of the RL500 sold under the Toro name. It had knobby tires and was the first model to include thermistors to protect the motors from overheating.
2000 [4] Yellow 3,200ft², 300m² [5] Came as A, B, or C models. Originally shipped with smooth tires. Knobby tires were introduced on the C models for better traction. C models also included new software that improved scan mode.
Yellow 4,300ft², 400m² Model not sold in the USA. Has smooth tires and no manual mowing mode to run the blades on command.
Silver Classic
1998 [6] Silver First generation model. Used a single, large blade.

Robomower Discussions

Places where you can discuss Robomower issues.

Robomower FAQs

Lists of Frequently Asked Questions and answers about Robomowers.

Robomower Troubleshooting and Repair

Visit the RoboMower Troubleshooting and Repair section for information about error codes, disassembly instructions, and more.

What is a Woot Mower?


Woot! is an Internet commerce company based in the Dallas suburb of Carrollton, Texas, which operates a website of the same name. Founded by electronics wholesaler Matt Rutledge, the site debuted on July 12, 2004, with a unique business model, offering a single discounted product per day, instead of the wide range of choices available through traditional online retailers such as This model was evolved from Synapse Micro where products are sold to the wholesale computer dealer market. Woot’s novel, irreverent approach quickly attracted a robust community of customers, who share their opinions on the site’s community forums. Product selections tend to emphasize (but are not limited to) computer components and electronic gadgetry, all sold at closeout prices.

The Friendly Robotics RL500 Robomower was the first product sold at when it launched on July 12, 2004 and was sold several other times over the next couple years. It was last offered for sale on February 25, 2005. It usually was offered for either $179.99 or $219.99, plus $5 S&H, making it an incredible deal. A typical description as posted on their site can be found here.

External References

  • Error creating thumbnail: Unable to save thumbnail to destination
    Scientific American magazine, May 2006, pp. 88-89, has an article about how the RoboMower works with some nice translucent diagrams.

  • Error creating thumbnail: Unable to save thumbnail to destination
    Robot magazine, Spring 2006, pp. 68-70, has an interview with Tyler Ramage from Robo Direct and frequent contributor to the RoboMower Yahoo Groups list. The article has pictures of the mower inside and out, information about how it works, and some of the history of the product. (The listing in the table of contents is very small and easy to overlook.)