John Deere 636M vs. 661R EFI

The 636M and the 661R EFI are both fantastic pieces of equipment. They share a number of similarities but have a few key differences, too. We’ll go over those differentiators to help you make the right decision for you and your property.

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SPECS John Deere 636M John Deere 661R EFI
Key Specs - Engine Power Gross at 3,600 rpm: 18.5 hp
13.8 kW
Gross at 3,600 rpm: 25 hp
18.6 kW
Key Specs - Transmission Hydrostatic Hydrostatic
Key Specs - Mower deck Size 36 in.
91.4 cm
61 in.
155 cm
Mower decks - Height-of-cut range Increments
0.25 in.
0.64 cm
1.5-5 in.
3.8-12.7 cm
Increments
0.25 in.
0.64 cm
1.5-5 in.
3.8-12.7 cm
Dimensions - Length 62 in.
157.5 cm
68 in.
172.7 cm
See Complete 636M Specs See Complete 661R EFI Specs