Kohler KD420 User manual
Technical Drawings
Standard Equipment
• Recoil Start with Automatic Compression Release
• Fuel Tank
• Fuel Filter
• Dry Air Cleaner
• Muffler with Guard
• Accelerator and Stop Manual Control
• 12 V Electric Start with Control Panel
• SAE J609a Ext 4 Crankshaft with Type B
Mounting Flange
• Fuel Safety Shutdown for Low Oil Pressure
Accessories
• Internal Dynamic Balancer
• 24 V Electric Start
• Accelerator and Stop Remote Control
• Key Start Panel with Shutdown Device
• Fuel Lift Pump
• Oil Temperature Switch
• Glow Plug on Intake Manifold
• SAE J609a Ext 9, 6 and 3 Integral Crankshafts
with Type B Mounting Flange
• Extended Wiring Harness
403.0/15.86 335.5/13.20
31.0/1.22
138.5/5.45
512.0/20.15
120.0/4.72120.0/4.72
196.70/7.74
509.0/20.03
488.0/19.21
155.0/6.10
4.0/
0.15
203.5/8.01
99.0/3.89
54.0/2.12
14.0/0.55
49.0/1.92
120.0/4.72
120.0/4.72
45.0/1.77
5.5/0.21
5.5/0.21
96.0/3.77
8.0/0.31
21.0/0.82
5.0/0.19
23.0/0.90
105.0/4.13
25.0/0.98
4.0/0.15
8.0/0.31
33.0/1.29
135.0/5.31
5.0/0.19
KOHLER® Diesel
Model KD420
KOHLER Co., Kohler, Wisconsin 53044 • Tel: 920-457-4441
800-544-2444 • Fax: 920-459-1570 • KohlerEngines.com
4 of 4
Form E-2148 9/10
© 2010 by Kohler Co.
Printed in U.S.A.
1 Cylinder • 442 cc • 7.3 kW/9.8 hp • 3600 rpm • 17 ft lbs @ 2200 rpm
Certification
• EPA Tier 4 (Hand-Start Provision)
• ECE R 24
Features
• 4-Stroke Air-Cooled Diesel Engine
• SAE J609a Crankshaft
• Counterclockwise Rotation
• Direct Injection
• Full-Pressure Lubrication
• Centrifugal Mass Governor
• Built-In Full-Flow Oil Filter
• Oil-Breathing Blow-By with Safety Device
• Automatic Extra-Fuel Starting Device
• Self-Bleeding Fuel System
• Torque Regulator
• Automatic Compression Release
• Die-Cast Aluminum Crankcase
with Integral Cast-Iron Cylinder Liner
• Aluminum Cylinder Head
• Mounting Feet
• Hydraulic Valve Lifters
• EGR System
Applications
• Two-Wheel Tractor
• Agricultural Mower
• Water Pump
• High-Pressure Cleaner
• Generator
• Vibrating Plate
• Hydraulic Power Pack
• Vibrating Roller
KOHLER® Diesel
Model KD420
1 of 4
© 2010 by Kohler Co.
Relentless Power.
Legendary Performance.
Specifications
Cylinders
Displacement
Bore
Stroke
Compression Ratio
Rating kW/hp
Maximum Torque
Minimum Idling Speed rpm
Fuel Tank Capacity
Oil Consumption
Oil Sump Capacity
Minimum Allowable Oil Pressure
Maximum Allowable Angle of Operation (Peak Values)
Volume of Air Required for Correct Combustion @ 3600 rpm
Volume of Air Required for Correct Cooling @ 3600 rpm
Dry Weight
Recommended Minimum Battery Size
Minimum Pulley Diameters for Belt Drive
No. of Cylinders 1
cc/cu in 442/27
mm/in 86/3.4
mm/in 76/3.0
20.3:1
N (80/1269/CEE) ISO 1585 7.3/9.8
NB ISO 3046 IFN 7.0/9.3
NA ISO 3046 ICXN 6.4/8.6
Nm/ft lbs @ 2200 rpm 23/17
950-1000
liters/quarts 5/5.3
kg/h/lb/h 0.0044/0.0097
liters/quarts 1.5/1.6
bar/psi 1-1.5/14.5-21.8
25° (35°)
liters/min/cfm 580/20
liters/min/cfm 5500/194
kg/lb 45/99.1
V/CCA Standard, Heavy-Duty 12/420, 510
D1 (mm) ≥ 620 [66+L2 (mm)] N (kW)
n (rpm)
D2 (mm) ≥ 650 [53+L1 (mm)] N (kW)
n (rpm)
Maximum Allowable Axial Load in Both Directions
A-B = 200 kg/441 lbf
Sound Pressure Level dBA
Sound Pressure Level Polar Diagram
Open Field at 7 Meters – No Load
Running Engine
KOHLER® Diesel
Model KD420
2 of 4 KohlerEngines.com
© 2010 by Kohler Co.
3600 rpm3000 rpm2000 rpm1000 rpm
dBA
65
70
80
Curves
N Power Curve – 80/1269/CEE – ISO 1585
NB Power Curve – ISO 3046/1 – IFN
NA Power Curve – ISO 3046/1 – ICXN
MN Torque Curve – (N Curve)
MB (B Curve – MA (A Curve)
C Specific fuel consumption – (NB Curve)
KOHLER® Diesel
Model KD420
KohlerEngines.com 3 of 4
© 2010 by Kohler Co.
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