Specifi cations
724 690 06 Rev. C KohlerEngines.com
ENGINE IDENTIFICATION NUMBERS
Kohler engine identifi cation numbers (model, specifi cation and serial) should be referenced for effi cient repair,
ordering correct parts, and engine replacement.
Model . . . . . . . . . . . . . . . . . . . . . CH620
Command Engine
Horizontal Shaft
Numerical Designation
Specifi cation . . . . . . . . . . . . . . . CH620-0001
Serial . . . . . . . . . . . . . . . . . . . . . 3923500328
Year Manufactured Code Factory Code
Code Year
39 2009
40 2010
41 2011
GENERAL SPECIFICATIONS
3,6
CH18/CH20/
CH22/
CH620-CH640
CH22/CH23/
CH670-CH680
CH25/
CH730/CH740
CH750
Bore 77 mm
(3.03 in.)
80 mm
(3.15 in.)
83 mm (3.27 in.)
Stroke 67 mm (2.64 in.) 69 mm
(2.7 in.)
Displacement 624 cc
(38 cu. in.)
674 cc
(41 cu. in.)
725 cc
(44 cu. in.)
747 cc
(46 cu. in.)
Oil Capacity (refi ll) 1.6-1.8 L (1.7-1.9 U.S. qt.)
Maximum Angle of Operation (@ full oil level)
4
25°
TORQUE SPECIFICATIONS
3,5
CH18/CH20/
CH22/
CH620-CH640
CH22/CH23/
CH670-CH680
CH25/
CH730/CH740
CH750
Blower Housing and Sheet Metal
M5 Fasteners 6.2 N·m (55 in. lb.) into new holes
4.0 N·m (35 in. lb.) into used holes
M6 Fasteners 10.7 N·m (95 in. lb.) into new holes
7.3 N·m (65 in. lb.) into used holes
Carburetor and Intake Manifold
Intake Manifold Mounting Fastener (torque in 2
increments)
fi rst to 7.4 N·m (66 in. lb.)
fi nally to 9.9 N·m (88 in. lb.)
M6 Mounting Screw 6.2-7.3 N·m (55-65 in. lb.)
Adapter (for Heavy-Duty Air Cleaner) Mounting
Fastener
7.3 N·m (65 in. lb.)
Closure Plate
Fastener 24.4 N·m (216 in. lb.)
3
Values are in Metric units. Values in parentheses are English equivalents.
4
Exceeding maximum angle of operation may cause engine damage from insuffi cient lubrication.
5
Lubricate threads with engine oil prior to assembly.
6
Any and all horsepower (hp) references by Kohler are Certifi ed Power Ratings and per SAE J1940 & J1995 hp
standards. Details on Certifi ed Power Ratings can be found at KohlerEngines.com.
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