Kohler COMMAND CH18, Service Manual

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1.8
Section 1
Safety and General Information
General Specifications¹
Power (@ 3600 RPM, exceeds Society of Automotive Engineers-Small Engine Test Code J1940.)
CH18 ........................................................................................................................................ 13.4 kW (18 HP)
CH20 ........................................................................................................................................ 14.9 kW (20 HP)
CH22 ........................................................................................................................................ 16.4 kW (22 HP)
CH23 ........................................................................................................................................ 17.2 kW (23 HP)
CH25, CH730 .......................................................................................................................... 18.6 kW (25 HP)
CH26 ........................................................................................................................................ 19.4 kW (26 HP)
CH740 ...................................................................................................................................... 20.1 kW (27 HP)
CH745 ...................................................................................................................................... 20.9 kW (28 HP)
CH750 ...................................................................................................................................... 22.3 kW (30 HP)
Peak Torque
CH18 @ 2200 RPM ................................................................................................................. 43.6 N·m (32.2 ft. lb.)
CH20 @ 2400 RPM ................................................................................................................. 44.3 N·m (32.7 ft. lb.)
CH22 @ 2400 RPM ................................................................................................................. 49.1 N·m (36.2 ft. lb.)
CH23 @ 2400 RPM ................................................................................................................. 54.1 N·m (37.9 ft. lb.)
CH25 @ 2200 RPM ................................................................................................................. 54.0 N·m (39.5 ft. lb.)
CH730 @ 2400 RPM ............................................................................................................... 55.4 N·m (40.9 ft. lb.)
CH26 @ 2800 RPM ................................................................................................................. 54.2 N·m (40.0 ft. lb.)
CH740 @ 2400 RPM ............................................................................................................... 57.3 N·m (42.3 ft. lb.)
CH745 @ 2600 RPM ............................................................................................................... 57.9 N·m (42.7 ft. lb.)
CH750 @ 2400 RPM ............................................................................................................... 64.4 N·m (47.5 ft. lb.)
Bore
CH18, CH20, CH22 (624 cc) .................................................................................................. 77 mm (3.03 in.)
CH22/23 (674 cc) .................................................................................................................... 80 mm (3.15 in.)
CH25, CH26, CH730-750 ....................................................................................................... 83 mm (3.27 in.)
Stroke
CH18-745 ................................................................................................................................ 67 mm (2.64 in.)
CH750 ...................................................................................................................................... 69 mm (2.7 in.)
Displacement
CH18, CH20, CH22 (624 cc) .................................................................................................. 624 cc (38 cu. in.)
CH22/23 (674 cc) .................................................................................................................... 674 cc (41 cu. in.)
CH25, CH26, CH730-745 ....................................................................................................... 725 cc (44 cu. in.)
CH750 ...................................................................................................................................... 755 cc (46 cu. in.)
Compression Ratio
CH18, CH20, CH22/23 ........................................................................................................... 8.5:1
CH25, CH26, CH730-745 ....................................................................................................... 9.0:1
CH750 ...................................................................................................................................... 9.4:1
Dry Weight
CH18, CH20, CH22/23 ........................................................................................................... 41 kg (90 lb.)
CH25, CH26, CH730-745 ....................................................................................................... 43 kg (94 lb.)
CH750 ...................................................................................................................................... 48 kg (105 lb.)
Oil Capacity (w/filter) - approximate,
determined by oil filter and oil cooler used ............................................................................. 1.6-1.8 L (1.7-1.9 U.S. qt.)
¹Values are in Metric units. Values in parentheses are English equivalents. Lubricate threads with engine oil
prior to assembly.