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Collection, Preservation and Display of Old Lawn Mowers

Atco Identification


Amongst my wee collection of older mowers, is this Atco 4 hp Briggs & Stratton ( dated August 1975 ), split rear roller with an aluminium grassbox. It is next in line for ' doing up '.

Would anyone be able to recognise this model ?

I proffer my thanks in advance .



wristpin Wed, 09/11/2016

By the looks of it a Heavy Duty 20". (or may be 24"!)

May have started life with rubber covered rear rollers.

hortimech Thu, 10/11/2016

Nope, not an HD, long time since I saw one, but it was a short lived model. If I remember correctly, the cylinder cut adjusters are different, instead of the opposing screws of the HD, it used adjuster knobs. The other thing I would check, the cut size, something is nagging at me, is it 18 inch ?


Swifty Thu, 10/11/2016

Apologies , tried unsuccessfully  to upload   images of  cylinder with tape measure showing a cutting size of 18 inches and an overall  width of 20 inches. 


wristpin Thu, 10/11/2016

Hortimech , you are right about the short lived model and yes it is an 18" . Only ever saw one and that was after I was fairly sure that the customer  had a 17" and not an 18". Had to eat my words then  as well!

I have to say that when I said it was an HD 20 the handle bars and Briggs engine were worrying me but I'd forgotten about the 18" option!

 Here it is The Atco 18" Middleweight. (please note that the first page is blank)…

For once that regular auction site description of "extremely rare" is possibly true!


Swifty Fri, 11/11/2016

Many thanks to Wristpin and Hortimech  for their astute observations and  for taking time to download  the very useful parts manual , despite the paucity of information provided. I have unsuccessfully tried for a few years  to find one similar .

I shall look forward to preserving this Atco 18 Middleweight.

Thank you again.