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Model R21

The ideal residential mower

R21 Model Overview

The R21 is the ideal machine for residential properties. Featuring a powerful 21 HP Kohler KT620 with Smart-Choke technology, this machine is a premium Walker Mower priced for residential owners. Tilt-open seat and tilt-up deck are designed for easy maintenance access.

Type: Non-Collection
Power: 21 HP
Engine: Kohler KT620
Ideal Application: 
Residential Properties
Key Attributes: Agile, Accessible, Compact
Standard Options: 18 x 8.5-10 Turf Tire, Standard Seat

Decks: 
Popular Add-ons:
Comfort Seat
LED Headlight Kit
Mulch Kit
Accelerator Grass Catcher

* MODELS MAY BE SHOWN WITH OPTIONAL EQUIPMENT. APPLICABLE FREIGHT, SETUP, AND TAXES NOT INCLUDED. ADDITIONAL DELIVERY FEES APPLY FOR US TERRITORIES AND STATES OUTSIDE OF THE CONTINENTAL US. OPTIONS AND ACCESSORIES EXTRA. PRICES SUBJECT TO CHANGE WITHOUT NOTICE. MSRP SHOWN IN US DOLLAR ARE FOR DOMESTIC USE ONLY. SEE LOCAL DEALER FOR COMPLETE PRICING AND AVAILABLE OFFERS.

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Features

Key Attributes - Agile

Agile

Be Responsive, Be Profitable

Key Attributes - Compact

Compact

Get Into and Out of Tight Spots

kohler-oil-1quart-GRAY

Fully Synthetic Oil

Kohler Pro 300-Hour Extended Life Oil Equipped

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Warranty

3YEARSentire tractor
3YEARSor 300 hours on drive system*
3YEARSengine
LEARN MORE *Gear Axle Assembly, Hydrostatic Transmissions for C, D, T and Hydrostatic Transaxles for B, H, S, R and C23i

Video

 

Bring Home the Model R

 

Model R Introduction

 

HOW TO: Model R Deck Tilt-Up

 

Model R In-Depth

 

Model R Trailer

Specifications

Engine

Manufacturer: Kohler

Model: KT620

Displacement: 660 cc (40.3 cu. in.)

Max Power: 21 HP @ 3600 RPM

Governed RPM: 3600

Max Torque: 35.9 ft-lbs

Cooling System: Air

Fuel: Gasoline (unleaded - min. 87 octane)

Fuel Capacity: 3 gal (11.36 liter)

Electrical

Battery: 12V, 300CCA

Charging System: Flywheel Alternator

Charging Output: 18 Amp DC (Regulated)

Transmission

Manufacturer/Model: Dual Independent Hydro-Gear ZT-2200 Integrated Transaxles

Steering: Hand Lever Control, Individual Wheel

Forward Speed Control: Precision Friction Lock Lever, Cruise Control, with Neutral-Park Position

Parking Brake: Mechanical Cog Lock for each Transaxle (Single Lever Control)

Forward MPH (km/h): 0-6 MPH (0-10 km/h)

Neutral: Transaxle Release by Manual Dump Valve

Blade Drive

PTO Shaft: Single Belt

Blade Drive Clutch and Brake: Electric Clutch [Stops Blades within Five (5) seconds of Disengagement]

Grass Handling

Note: An optional Accelerator® Grass Catcher is available for collection mowing

Grass Catcher Capacity: 31 Gal / 3.3 Bu / 116 L

Deck

Recommended Cut Width: Side Discharge: 42 to 48 in. (107 to 122 cm), Mulch: 42 to 48 in. (107 to 122 cm)

Cutting Height: 1.5 to 4 in (4 to 10 cm)

Deck Suspension: Independent Torsion-Flex Frame with Caster Wheels and Counterweight Springs

Tires

Drive: 18 x 8.50-10 (Pneumatic 4-Ply, Low Profile)

Tailwheel: 13 x 6.50-6 (Pneumatic 4-Ply)

Deck Caster: 8 x 3.00-4 (Semi-Pneumatic)

Size & Weight

LENGTH

  • Tractor with S48 deck: 96 in (244 cm)
  • Tractor with deck tilted: 74 in (188 cm)
  • Tractor wheel base: 39 in (99 cm)

WIDTH

  • Tractor Only (Outside Tire): 39 in (99 cm)
  • Tractor with S48 deck: 49 in (124.5 cm)

HEIGHT

  • Tractor: 42 in (107 cm)

WEIGHT

  • Tractor Only: 404 lbs (183 kg)
  • Tractor with S48 deck: 593 lbs (269 kg)

Downloads

Manuals

Released Class Model Type Model S/N Range Manual P/N Download
11/30/2023 Model-R R21 Operator's 178455 - AND ON 1000-8 PDF
11/27/2023 Model-R R21 Parts 178455 - AND ON 1000-7 PDF
09/22/2022 Model-R R21 Parts 174105 - 178454 1000-6 PDF
03/22/2022 Model-R R21 Operator's 171697 - 178454 1000-5 PDF
09/20/2021 Model-R R21 Parts 165963 - 174104 1000-4 PDF
09/14/2020 Model-R R21 Parts 160824 - 165962 1000-2 PDF
09/03/2020 Model-R R21 Operator's 160824 - 171696 1000-3 PDF
09/17/2019 Model-R R21 Operator's 158429 - 160823 1000-1 PDF
08/28/2019 Model-R R21 Parts 158429 - 160823 1000 PDF