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Internet # 313805729

Model # 36BBM20R-EXT

Store SKU # 1005523533

36 in. 20 HP 656cc Gas Powered by Briggs and Stratton Engine Walk Behind Brush Lawn Mower with Commercial Hydro Duty

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Product Details

About This Product

This Heavy-duty BRUSH BEAST brush walk behind mower powered by a 20 HP Briggs and Stratton v-twin engine combined with dual hydro-static drives transforms tall grasses and thickets into a 4 in. finish cut appearance in a single pass. Dual breakaway blades act like battering axes to cut up to 4 in. Diameter x 20 ft. trees. Landscapers, large lot owners, hunting clubs, grounds keepers and parks departments will appreciate the electric start, effortless dual hydro control and fast forward speed. Clear up to an acre in less than 30-minutes.


  • Cuts up to 4 in. Dia tree trunks effortlessly when clearing large areas
  • Clears up to 1 acre of dense vegetation in under 30-minutes
  • Dual break away blades on 50 lbs. flywheel create incredible cutting power
  • 1.5 in. Dia blade pivot studs
  • Substantial heavy-duty construction with 7-Gauge steel welded deck
  • Professional cut quality that can only be achieved with 18,750 ft./minute blade tip speed
  • Dual hydrostatic drive for ease in maneuverability
  • Effortless startup with the electric start and battery feature
  • Patented soft start clutch and spindle brakes for longer belt life and lower maintenance
  • Exclusive V-bar E-Z hydro speed control for easy maneuverability
  • Quality cut at high speeds through tall grass with the high capacity deck
  • High quality aramid fiber V-belt for longer life usage
  • Front discharge for improved safety
  • Replaceable 3/8 in. rubber guarding to prevent kick back
  • Fully assembled and tested when delivered, just add oil and gas
  • Save money with this 2-in-1 feature: converts in minutes to a 36 in. turf beast mower with finish cut mower conversion kit, sold separately (part number M36FDB)
  • Recommend: review mower buying guide for selecting the correct mower application
  • Return Policy

Product Information

Internet # 313805729

Model # 36BBM20R-EXT

Store SKU # 1005523533


Dimensions: H 38 in, W 39.5 in, D 87 in


Assembled Depth (in.)87 inAssembled Height (in.)38 in
Assembled Width (in.)39.5 inBlade Length (in.)35.25 in
Cutting Width (in.)36 inchesFront Wheel Size (in.)3
Mower Deck Width (in.)36 inRear Wheel Height (in.)High Wheel
Rear Wheel Size (in.)16


Assembly RequiredNoCutting Height Options1-position
Cutting OptionsFront-DischargeDeck Material7 Gauge Steel
Deck TypeStampedDrive TypeRear-wheel Drive
Engine Displacement (cc)656Engine MakeBriggs and Stratton Engine
Engine Torque (ft.-lb.)33.6FeaturesRust Resistant
Fuel Tank Capacity (gal.)4.5 galIncludedNo additional items or accessories included
Lawn Mower TypeBrush MowerMaximum Cutting Height (in.)4 in
Maximum Forward Speed (mph)8Maximum Reverse Speed (mph)1
Minimum Cutting Height (in.)4 inMower Size TypeWide Area Mower
Number of Blades2Number of CylindersV-Twin
Number of Deck Wheels2Number of Handlebar Positions1
Oil Capacity (oz.)57.6Power TypeGas
Product Weight (lb.)656 lbRecommended Oil TypeSAE 10W-30
Recommended TerrainFlat, Sloped, UnevenRefurbishedNo
Returnable30-DaySize of Yard2 - 4 Acres
Start TypePush Button StartTransmission TypeHydrostatic

Warranty / Certifications

Certifications and ListingsEPA Approved, UL ListedManufacturer Warranty12 Month Limited

Questions & Answers

Q:What battery does this take?
by|Jul 2, 2022
1 Answer
Answer This Question

A:  A gas powered battery. Find it on isle 4.

by|Feb 28, 2024
    2 found this answer helpful
    Q:Do this have an oil pump, I have very uneven terrain and do not want to burn out an engine
    by|Mar 22, 2021
    0 Answer
    Answer This Question
    Q:if housing is rigid and the cutters don't appear to extend beyond, how can it cut 3" saplings without having to bend them over?
    by|Mar 20, 2021
    2 Answers
    Answer This Question

    A:  It doesn't. I find that saplings over 2" are very difficult to cut. The mower rises to knock the tree down, and that's very dangerous. The hand controls are also awful for my hands--so hard to squeeze the forward motion with only the thumbs.

    by|Jun 12, 2023
      2 found this answer helpful

      A:  Suggestion: Cuts down the sapling first. While the mower is very powerful, you do not want to damage the hydrostatic drive underneath.

      by|May 18, 2023
        3 found this answer helpful
        Q:Why does the company claim this machine can cut up to 4 inch trees 20 feet tall, yet the promo video only shows it cutting grass? Answer...its just another bramble mower with no tree cutting ability. If they were to invent an actual walk behind "forest mulcher/mower"...they would have a true "Beast"...but all they have now is a shiny lawnmower.
        by|Mar 15, 2021
        0 Answer
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        Customer Reviews

        3 out of 5
        • 3 out of 2 reviews
        • 0% recommend this product
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        Showing 1-2 of 2 reviews
        Low Quality and Worse Product Support
        This machine is low quality and the product support is even worse. Save yourself time and money and do NOT purchase this mower. It is made by GXI Outdoor Power, do a search to find all of their negative reviews. My mower came missing a part, and after some back and forth with their customer service team it was determined that I would need to purchase the replacement part and pay for shipping. I don't normally leave bad reviews. I'm just hoping this will help others not make the same mistake I did.
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          Rating provided by a verified purchaser
          • Verified Purchase
          1 found this review helpful
          Showing 1-2 of 2 reviews