Montgomery Ward Twin 20
The Montgomery Ward Twin 20 is a tractor produced by Montgomery Ward Lawn Tractors. It is equipped with a 816 cc 49.8 ci engine. The listed engine power is Gasoline (gross): 19.9 hp / 14.8 kW. Transmission: Sundstrand. Operating weight: 600 lbs 272 kg.
Engine Power
Gasoline (gross): 19.9 hp / 14.8 kW
Fuel & Capacities
3.8 gal
14.4 L
Transmission
Sundstrand
Operating Weight
600 lbs
272 kg
Overview
 | 1975 - 1976
Garden tractorSimplicity built
Garden tractor
Simplicity built |
|---|
Production | |
|---|---|
Distributor | Montgomery Ward |
Manufacturer | Simplicity |
Garden tractor | |
Built in Port Washington, Wisconsin, USA | |
Original price was $3,650 in 1975 | |
The Montgomery Ward Twin 20 carried model codes SIM33300, SIM33301, SIM33302 and SIM33303 depending on tire options. | |
Variants | |
|---|---|
9020 | similar Simplicity model |
720 | similar Allis Chalmers model |
Montgomery Ward Twin 20 Engine | |
|---|---|
19.9HP Onan 816cc 2-cyl gasoline | |
Fuel tank | 3.8 gal
14.4 L |
Engine details ...  | |
Montgomery Ward Twin 20 Transmission | |
|---|---|
hydrostatic | |
Transmission details ...  |
Mechanical | |
|---|---|
Two-wheel drive | |
Manual steering | |
Disc brakes | |
Open operator station. |
Hydraulics | |
|---|---|
Pressure | 500 psi
34.5 bar |
Front valves | 1 |
Total flow | 2.5 gpm
9.5 lpm |
Tractor hitch | |
|---|---|
Rear Type | 0 |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Clutch | electric |
Rear PTO Type | 2000 |
Front PTO | independent |
Clutch | electric |
Front PTO Type | 3600 |
Dimensions & Tires | |
|---|---|
Wheelbase | 56 inches
142 cm |
Weight | 1300 lbs
589 kg |
Front tire | 20x8.00-10 |
Rear tire | 29x12.00-15 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Charging system | flywheel alternator |
Charging amps | 20 |
Charging volts | 12 |
Battery volts | 12 |
Battery AH | 45 |
References | |
|---|---|
 | |
Lawn, Garden & Farm Catalog published in 1975, by Montgomery Ward | |
Suburban Farm & Garden Catalog published in 1976, by Montgomery Ward |
Engine
Engine Detail — 816 cc / 49.8 ci Gasoline
Manufacturer | Onan CCKB |
Fuel Type | Gasoline |
Configuration | 2-cylinder, air-cooled horizontal-shaft opposed-twin |
Displacement | 816 cc
49.8 ci |
Bore/Stroke | 3.25x3.00 inches
83 x 76 mm |
Power (gross) | 19.9 hp
14.8 kW |
Air cleaner | paper element |
Compression | 7:1 |
Rated RPM | 3600 |
Idle RPM | 1300-3850 |
Starter | electric |
Starter volts | 12 |
Sparkplug | Champion H-8 |
Autolite AL5 | |
Sparkplug gap | 0.025 inches
0.635 mm |
Point gap | 0.020 inches
0.508 mm |
Intake valve clearance | 0.007 inches (cold)
0.178 mm |
Exhaust valve clearance | 0.016 inches (cold)
0.406 mm |
Oil capacity | 4 qts
3.8 L |
Oil change | 100 h |
Transmission
Transmission — Sundstrand
Transmission | Sundstrand | |||
Type | hydrostatic | |||
Gears | infinite forward and reverse (3-range) | |||
Oil capacity | 6 qts
5.7 L | |||
Oil type | ATF AATF FDextron | ATF A | ATF F | Dextron |
 | ||||
ATF A | |
|---|---|
ATF F | |
Dextron |
Dimensions
Montgomery Ward Twin 20 Tires | |
|---|---|
Lawn/turf front | 20x8.00-10 |
Lawn/turf rear | 29x12.00-15 |
Dimensions | |
|---|---|
Wheelbase | 56 inches
142 cm |
Length | 83 inches
210 cm |
Width | 56 inches
142 cm |
Height (steering wheel) | 48 inches
121 cm |
Shipping weight | 1300 lbs
589 kg |
Clearance (front axle) | 15 inches
38 cm |
Clearance (drawbar) | 13 inches
33 cm |
Attachments
Attachment overview | |
|---|---|
60" mid-mount mower deck | |
Snowblower | |
Blade | |
Front-end loader | |
Backhoe | |
Advertised attachments for the Montgomery Ward Twin 20 included a 48-inch PTO-driven tiller and a Danco-built 48-inch rear rotary mower. |
60" Mower deck | |
|---|---|
Type | mid-mount Montgomery Ward 33305 |
3-blade | |
Cutting width | 60 inches
152 cm |
Weight | 280 lbs
127 kg |
Montgomery Ward 33319 Backhoe | |
|---|---|
Backhoe type | Montgomery Ward 33319 Backhoe |
Weight | 600 lbs
272 kg |
Digging depth | 72 inches
182 cm |
Reach from pivot | 108 inches
274 cm |
Swing Arc | 135° |
Photos
Montgomery Ward Twin 20 tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for Montgomery Ward Lawn Tractors Montgomery Ward Twin 20 based on its 19.9 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 1 to 2 Bottom (12")1 - 2 铧 (30 cm) | Light Duty | Ideal for garden plots and light sandy soil. |
Rotary Cutter / MowerMowing & Clearing | 4 ft (48 in)1.2 m | Light Duty | Pasture clipping and light brush under 1" diameter. |
Rotary TillerSeedbed Prep | 42 to 48 in105 - 120 cm | Light Duty | Covers compact tractor tire width. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for Montgomery Ward Lawn Tractors Montgomery Ward Twin 20.
Estimated Continuous Field Runtime: 3.7 hrs
Approximately 3.7 hours of continuous field operation at ~75% rated power on a full tank (3.8 gal / 14.4 L).
Estimated 75% Load Fuel Burn~1 gal/hr (3.9 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
Montgomery Ward Lawn Tractors Montgomery Ward Twin 20 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Montgomery Ward Lawn Tractors Montgomery Ward Twin 20.
Converted Equivalents:
Horsepower (HP)19.9 hp
Kilowatts (kW)14.8 kW
Metric Horsepower (PS / CV)20.2 PS
Direct Competitor Comparison
Compare Montgomery Ward Twin 20 against same-era industry alternatives in the same horsepower class.
Current Model
Montgomery Ward Lawn Tractors
Montgomery Ward Twin 20
Engine Power:Gasoline (gross): 19.9 hp / 14.8 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 184 Lo-Boy
Engine Power:18
Production Years:1977 - 1980