Honda HA4120
The Honda HA4120 is a tractor produced by Honda Lawn Tractors. It is equipped with a 614 cc 37.5 ci engine. The listed engine power is Gasoline (listed): 20 hp / 14.9 kW. Transmission: Tuff Torq K61. Operating weight: 559 lbs 253 kg.
Engine Power
Gasoline (listed): 20 hp / 14.9 kW
Fuel & Capacities
2.5 gal
9.5 L
Transmission
Tuff Torq K61
Operating Weight
559 lbs
253 kg
Overview
 | 1998 - 2001
Lawn tractorJohn Deere built
Lawn tractor
John Deere built |
|---|
Production | |
|---|---|
Distributor | Honda |
Manufacturer | John Deere |
Lawn tractor | |
Built in Horicon, Wisconsin, USA | |
Honda HA4120 Engine | |
|---|---|
20HP Honda 614cc 2-cyl gasoline | |
Fuel tank | 2.5 gal
9.5 L |
Engine details ...  | |
Honda HA4120 Transmission | |
|---|---|
hydrostatic | |
Transmission details ...  |
Mechanical | |
|---|---|
Two-wheel drive | |
Open operator station. |
Dimensions & Tires | |
|---|---|
Wheelbase | 45.9 inches
116 cm |
Weight | 559 lbs
253 kg |
Front tire | 15x6.00-6 |
Rear tire | 20x10.00-8 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Battery volts | 12 |
Engine
Engine Detail — 614 cc / 37.5 ci Gasoline
Manufacturer | Honda GXV620 |
Fuel Type | Gasoline |
Configuration | 2-cylinder, air-cooled V-Twin |
Displacement | 614 cc
37.5 ci |
Bore/Stroke | 3.03x2.60 inches
77 x 66 mm |
Power | 20 hp
14.9 kW |
Rated RPM | 3600 |
Starter | electric |
Starter volts | 12 |
Sparkplug | NGK BPR5ES |
Sparkplug gap | 0.030 inches
0.762 mm |
Oil capacity | 2.2 qts
2.1 L |
Transmission
Transmission — Tuff Torq K61
Transmission | Tuff Torq K61 |
Type | hydrostatic |
Gears | infinite forward and reverse |
Oil capacity | 3.6 qts
3.4 L |
Oil type | SAE 10W-30 SH |
 | |
Dimensions
Honda HA4120 Tires | |
|---|---|
Lawn/turf front | 15x6.00-6 |
Lawn/turf rear | 20x10.00-8 |
Dimensions | |
|---|---|
Wheelbase | 45.9 inches
116 cm |
Length | 68.4 inches
173 cm |
Width | 59.2 inches
150 cm |
Height | 40.7 inches
103 cm |
Weight | 559 lbs
253 kg |
Attachments
48" Mower deck | |
|---|---|
Type | mid-mount Honda |
3-blade | |
Cutting width | 48 inches
121 cm |
Cut height | 1 to 4 inch
2 to 10 cm |
Photos
Honda HA4120
Recommended Implements & Sizing Guide
Engineering recommendations for Honda Lawn Tractors Honda HA4120 based on its 20 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. |
Disc HarrowSecondary Tillage | 5 to 6 ft (16-18" discs)1.5 - 1.8 m (40-45 cm 耙片) | Light Duty | Small acreage soil break-up and secondary aeration. |
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 Honda Lawn Tractors Honda HA4120.
Estimated Continuous Field Runtime: 2.4 hrs
Approximately 2.4 hours of continuous field operation at ~75% rated power on a full tank (2.5 gal / 9.5 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
Honda Lawn Tractors Honda HA4120 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Honda Lawn Tractors Honda HA4120.
Converted Equivalents:
Horsepower (HP)20 hp
Kilowatts (kW)14.9 kW
Metric Horsepower (PS / CV)20.3 PS
Direct Competitor Comparison
Compare Honda HA4120 against same-era industry alternatives in the same horsepower class.
Current Model
Honda Lawn Tractors
Honda HA4120
Engine Power:Gasoline (listed): 20 hp / 14.9 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 184 Lo-Boy
Engine Power:18
Production Years:1977 - 1980
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