Specifications, Service and Repair of Farm and Lawn Tractors

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Kohler Command PRO CV730S

General Technical Data

Kohler CV730S Engine Specifications

Engine Model ................... Kohler Command PRO CV730S
Engine Type ................... 4-cycle gasoline, OHV, air-cooled
Number of Cylinders ................... V-Twin
Displacement, cc (cu.in) ................... 725 (44.0)
Engine Bore, mm (in) ................... 83.0 (3.27)
Engine Stroke, mm (in) ................... 67.0 (2.64)
Rated Engine Power, hp (kW) ................... 25.0 (18.4)
Rated Engine Speed, rpm ................... 3600
Maximum Torque, Nm (ft-lbs) ................... 54.1 (39.9)
Torque Speed, rpm ................... 2800
Compression ................... 9.0:1
Lubrication ................... Full pressure
Oil filter ................... Full-flow type
Air Cleaner ................... Replaceable, paper element
Oil Capacity, L (qts) ................... 1.9 (2.0)
Electrical System Rating, Volts ................... 12
Starter Type ................... Electric
Battery Rating ................... 12V, 400 CCA

Fuel System

Fuel System Type ................... Carburetor
Carburetor Model ................... Nikki or Keihin
Carburetor Type ................... Fixed main jet
Fuel Pump ................... Pulse type
Fuel Filter ................... In-line
Governor ................... Mechanical, centrifugal type

Dimensions

Length, mm (in) ................... 450 (17.8)
Width, mm (in) ................... 448 (17.7)
Height, mm (in) ................... 357 (14.1)
Net weight, kg (lbs) ................... 43.0 (94)

Kohler CV730S Maintenance Data

Cylinder Block and Valves

Cylinder Bore I.D. (Maximum), mm (in) ................... 83.051 (3.2697)
Cylinder Head (Max. Out-of-Flatness), mm (in) ................... 0.076 (0.003)
Intake Valve Clearance (Cold), mm (in) ................... 0.038-0.076 (0.0015-0.0030)
Exhaust Valve Clearance (Cold), mm (in) ................... 0.050-0.088 (0.0020-0.0035)

Engine Oil

Engine Oil Type (Summer) ................... SAE 10W-30
Engine Oil Type (Winter) ................... SAE 5W-20, 5W-30
Oil Classification ................... SG, SH, SJ or higher
Oil Capacity (w/o Filter), L (qts) ................... 1.7 (1.8)
Oil Capacity (with New Filter), L (qts) ................... 1.9 (2.0)

Carburetor Adjustment

Main Fuel ................... 2-1/2 turns
Idle Fuel ................... 3/4 to 1 full turn
Low Idle Speed, rpm ................... 1200±75
High Idle Speed, rpm ................... 3600±50

Ignition System

Spark Plug Type ................... Champion RC12YC
Spark Plug Gap, mm (in) ................... 0.76 (0.030)
Module Air Gap, mm (in) ................... 0.28-0.33 (0.011-0.013)
Thread Size, mm (in) ................... 14 (0.55)
Reach, mm (in) ................... 19.1 (0.75)
Spark Plug Torque, Nm (ft-lbs) ................... 24.4-29.8 (18-22)

Service Intervals

Service Precleaner Element ................... Every 25 hours
Replace Air Cleaner Element ................... Every 100 hours
Change Engine Oil ................... Every 100 hours
Clean Oil Cooler Fins ................... Every 100 hours
Check Carburetor Adjustment ................... Every 100 hours
Check Spark Plug Condition and Gap ................... Every 200 hours
Change Oil Filter ................... Every 200 hours
Replace Spark Plug ................... Every 300 hours
Check and Adjust Valve Clearance ................... Every 300 hours

Kohler CV730S Service Specifications

Cylinder Block

Cylinder Bore I.D (Standard), mm (in) ................... 82.988-83.013 (3.2672-3.2682)
Cylinder Bore I.D (Max. Wear Limit), mm (in) ................... 83.051 (3.2697)
Cylinder Bore (Max. Out-of-Round), mm (in) ................... 0.12 (0.0047)
Cylinder Bore Max. Taper, mm (in) ................... 0.05 (0.0020)
Cylinder Head Max. Out-of-Flatness, mm (in) ................... 0.076 (0.003)
Camshaft End Play (With Shim), mm (in) ................... 0.076-0.127 (0.0030-0.0050)
Camshaft Clearance, mm (in) ................... 0.025-0.063 (0.0010-0.0025)
Camshaft Bore I.D, mm (in) ................... 20.000-20.025 (0.7874-0.7884)
Camshaft Bearing Surface O.D, mm (in) ................... 19.962-19.975 (0.7859-0.7864)
Connecting Rod-to-Crankpin Clearance, mm (in) ................... 0.030-0.055 (0.0012-0.0022)
Connecting Rod-to-Crankpin Side Clearance, mm (in) ................... 0.26-0.63 (0.0102-0.0248)
Connecting Rod-to-Piston Pin Clearance, mm (in) ................... 0.015-0.028 (0.0006-0.0011)

Valves

Hydraulic Valve Lifter to Crankcase Clearance, mm (in) ................... 0.0241-0.0501 (0.0009-0.0020)
Intake Valve Stem-to-Valve Guide Clearance, mm (in) ................... 0.038-0.076 (0.0015-0.0030)
Exhaust Valve Stem-to-Valve Guide Clearance, mm (in) ................... 0.050-0.088 (0.0020-0.0035)
Intake Valve Guide I.D, mm (in) ................... 7.038-7.058 (0.2771-0.2779)
Exhaust Valve Guide I.D, mm (in) ................... 7.038-7.058 (0.2771-0.2779)
Valve Guide Reamer Size (Standard), mm (in) ................... 7.048 (0.2775)
Valve Guide Reamer Size (0.25 mm Oversize), mm (in) ................... 7.298 (0.2873)
Intake Valve Minimum Lift, mm (in) ................... 8.07 (0.3177)
Exhaust Valve Minimum Lift, mm (in) ................... 8.07 (0.3177)

Crankshaft

Crankshaft End Play (Free), mm (in) ................... 0.070-0.590 (0.0028-0.0230)
Crankshaft Bore (In Crankcase), mm (in) ................... 40.965-41.003 (1.6128-1.6143)
Crankshaft to Sleeve Bearing Clearance, mm (in) ................... 0.03-0.09 (0.0012-0.0035)
Crankshaft Bore, mm (in) ................... 40.987-40.974 (1.6136-1.6131)
Crankshaft Bore-to-Crankshaft Clearance, mm (in) ................... 0.039-0.074 (0.0015-0.0029)
Flywheel End Main Bearing Journal O.D, mm (in) ................... 40.913-40.935 (1.6107-1.6116)
Flywheel End Main Bearing Journal Max. Taper, mm (in) ................... 0.022 (0.0009)
Oil Pan End Main Bearing Journal O.D, mm (in) ................... 40.913-40.935 (1.6107-1.6116)
Oil Pan End Main Bearing Journal Max. Taper, mm (in) ................... 0.022 (0.0009)
Connecting Rod Journal O.D, mm (in) ................... 35.955-35.973 (1.4156-1.4163)
Connecting Rod Journal Max. Taper, mm (in) ................... 0.018 (0.0007)
Crankshaft T.I.R (PTO End, Crank in Engine), mm (in) ................... 0.279 (0.0110)
Crankshaft T.I.R (Entire Crank, in V-Blocks), mm (in) ................... 0.10 (0.0039)

Piston and Piston Rings

Piston-to-Piston Pin Clearance, mm (in) ................... 0.006-0.017 (0.0002-0.0007)
Piston Pin End I.D, mm (in) ................... 17.015-17.023 (0.6699-0.6702)
Piston Pin Bore I.D, mm (in) ................... 17.006-17.012 (0.6695-0.6698)
Piston Pin O.D, mm (in) ................... 16.995-17.000 (0.6691-0.6693)
Top Compression Ring-to-Groove Side Clearance, mm (in) ................... 0.025-0.048 (0.0010-0.0019)
Middle Compression Ring-to-Groove Side Clearance, mm (in) ................... 0.015-0.037 (0.0006-0.0015)
Oil Control Ring-to-Groove Side Clearance, mm (in) ................... 0.026-0.176 (0.0010-0.0070)
Top and Middle Compression Ring End Gap, mm (in) ................... 0.25-0.56 (0.0100-0.0224)
Piston Thrust Face O.D, mm (in) ................... 82.986 (3.3194)
Piston Thrust Face-to-Cylinder Bore Clearance, mm (in) ................... 0.001-0.045 (0.039-0.0018)

Kohler CV730S Tightening Torque Specs

Cylinder Head Flange Nut, Nm (ft-lb) ................... 16.9-33.9 (12.5-25)
Cylinder Head Bolt, Nm (ft-lb) ................... 22.6-41.8 (16.7-30.8)
Rocker Arm Screw, Nm (ft-lb) ................... 11.3 (8.3)
Connecting Rod Cap, Nm (ft-lb) ................... 22.7 (16.7)
Flywheel Retaining Screw, Nm (ft-lb) ................... 66.4 (49)
Intake Manifold Mounting, Nm (ft-lb) ................... 7.4 (5.5)
Carburetor Mounting Nut, Nm (ft-lb) ................... 6.2-7.3 (4.6-5.4)
Oil Drain Plug, Nm (ft-lb) ................... 13.6 (10)
Oil Pan, Nm (ft-lb) ................... 24.4 (18)
Governor Lever Nut, Nm (ft-lb) ................... 6.8 (5)
Ignition Module, Nm (ft-lb) ................... 4.0-6.2 (2.9-4.6)
Oil Filter, Nm (ft-lb) ................... 10.4-12.7 (7.5-9.2)

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