Zero Turn Lawn Mowers

Walker MD Series


A favourite tractor for municipal, institutional and government customers is the MD. This is in part because of the powerful Kubota, three-cylinder, liquid-cooled diesel engine. One innovation highlight of the D21d is a self-reversing fan to keep radiator clean. The D-series shares the same basic design as the T-series and is capable of using most all of the decks, implements and attachments built for the grass collection style machines.

20.9-hp Kubota, 3 cylinder., liquid-cooled, 722cc diesel engine
Electric radiator fan with reversible, self-cleaning action
Clam-shell style body completely exposes drive train and engine
Shock-mounted instrument panel with warning lights and horn, also includes ignition switch, light switch, water temperature gauge, voltmeter and hourmeter
Remote engine air intake
Belt tightener clutch/band brake
10.0 Bushel Catcher and 10.5″ blower on GHS model
Designed for grass handling, side discharge or mulch decks up to 74″
Splined PTO drive shaft with Quick-Disconnect Coupler
4.7 gallon fuel tank
Parking brake

Engine Specifications



Kubota D722, 3-Cylinder


44.0 cu. In. (722cc)


20.9 @ 3600

Max Torque [ft-lb (N’m) @ RPM]

34 (43.0) @ 2600


Diesel (2-D)

Fuel Capacity

4.7 Gallons (17.8 litres)

Cooling System

Liquid, Radiator

Lubrication System

Full Pressure with Filter


Engine Tuned (Lo Tone)

Electrical System


12 Volt (340 CCA)

Charging System

40-Ampv Automotive Alternator


Diesel with  Glow Plug


12 Volt Electric Key and Solenoid Operated

Interlock Switch System

Ignition Lockout by Seat Switch, Transmission Neutral & Blade Clutch

Tractor Drive

Transmission/Final Drive

Dual Hydrostatic Eaton Model 7, Each wheel independently driven


Hand Lever Control, Individual Drive Wheel

Forward Speed Control

Precision Friction Lock Lever, Cruise Control with Neutral Park Position


Dynamic Braking through Hydrostatic Transmissions

Parking Brake

Mechanical Pin Lock in Transmission Gear

Ground Speed

0-5 MPH (8 Kph) Infinitely Variable (Forward/ Reverse),                                 7.0 MPH w/ (11.2 Kph) Optional Kit

Turning Radius

Zero (0°)

Mower Deck


Cutting Width (Inches)

36-74 (15 Decks)

Cutting Height (Inches)

1 to 4 (2.54 to 10.16 cm), 1/2” (1.27 cm) Increments


0.197 inch Stamped Steel, 10B38 Alloy, Tempered

Maximum Blade Speed

2900 RPM (16700 FPM with 22” Blade)

Blade Drive

Splined PTO Drive Shaft/2 High Speed U-Joints, Shear Pin for Shock Protection on Times Gear Drive on Deck

Blade Clutch & Brake

Manual Belt Tightener/Band Brake

Deck Suspension

Torsion-Flex Fame with Caster Wheels and Counterweight Springs




All Welded Unitised Steel Frame/14 Gauge Steel Body Shell

Mower Deck

11 Gauge Welded Steel

GHS Catcher & Chutes

Molded cross-Linked Polyethylene (High Impact Material, UV Stabilised)


Grammer Suspension Seat with Armrests (Adjustable for Operator Weight)

Tire Size


Deck Caster Wheel

Standard 8 x 3 Pneumatic (4 Ply), Optional 8 x 3 Foamed Rubber


18 x 9.50-8

Rear Tire

11 x 4-5



Outside Dimensions*

44 in. (112 cm) H x 43 in. (109 cm) W x 88 in. (224 cm) L

Wheel Base (Tractor)

42-1/4 in. (102 cm)

Tread Width (Tractor)

29-3/4 in. (75 cm)

Curb Weight (Approx.)


SD Tractor Only

787 lbs. (357 kg)

GHS Tractor Only

932 lbs. (424 kg)

Tractor and Mower

1125 lbs. (510 kg)


3 Years 300 Hours


MD21d   20.9hp Kubota Diesel Engine  $31990

MD21d-H  20.9  Kubota Diesel Engine Hi-Dump   $37890

Price for mower only, deck options additional – please enquire