CH18-CH25, CH620-CH730, CH740, CH750 Service Manual

1 CH18- ch25 , ch620 - ch730 , ch740 , CH750 Service Manual2 Safety3 Maintenance5 Specifi cations15 Tools and Aids18 Troubleshooting23 Air Cleaner/Intake24 Fuel System37 Governor System55 Lubrication System57 Electrical System76 Starter System85 Clutch87 Disassembly/Inspection and Service102 ReassemblyIMPORTANT: Read all safety precautions and instructions carefully before operating equipment. Refer to operating instruction of equipment that this engine powers. Ensure engine is stopped and level before performing any maintenance or 690 06 Rev. 690 06 Rev. PRECAUTIONS WARNING: A hazard that could result in death, serious injury, or substantial property damage.

2 CAUTION: A hazard that could result in minor personal injury or property : is used to notify people of important installation, operation, or maintenance information. WARNINGE xplosive Fuel can cause fi res and severe not fi ll fuel tank while engine is hot or is extremely fl ammable and its vapors can explode if ignited. Store gasoline only in approved containers, in well ventilated, unoccupied buildings, away from sparks or fl ames. Spilled fuel could ignite if it comes in contact with hot parts or sparks from ignition. Never use gasoline as a cleaning agent.

3 WARNINGR otating Parts can cause severe away while engine is in hands, feet, hair, and clothing away from all moving parts to prevent injury. Never operate engine with covers, shrouds, or guards removed. WARNINGC arbon Monoxide can cause severe nausea, fainting or inhaling exhaust fumes. Never run engine indoors or in enclosed exhaust gases contain poisonous carbon monoxide. Carbon monoxide is odorless, colorless, and can cause death if inhaled. WARNINGA ccidental Starts can cause severe injury or and ground spark plug lead(s) before working on engine or equipment, disable engine as follows: 1) Disconnect spark plug lead(s).

4 2) Disconnect negative ( ) battery cable from battery. WARNINGHot Parts can cause severe not touch engine while operating or just after operate engine with heat shields or guards removed. WARNINGC leaning Solvents can cause severe injury or only in well ventilated areas away from ignition cleaners and solvents are extremely fl ammable. Follow cleaner manufacturer s warnings and instructions on its proper and safe use. Never use gasoline as a cleaning agent. CAUTIONE lectrical Shock can cause not touch wires while engine is running. CAUTIOND amaging Crankshaft and Flywheel can cause personal improper procedures can lead to broken fragments.

5 Broken fragments could be thrown from engine . Always observe and use precautions and procedures when installing fl ywheel. CAUTIONF ailure to utilize or reassemble debris screen as designed could result in debris screen failure and serious personal injury. WARNINGU ncoiling Spring can cause severe safety goggles or face protection when servicing retractable starters contain a powerful, recoil spring that is under tension. Always wear safety goggles when servicing retractable starters and carefully follow instructions in Retractable Starter for relieving spring 690 06 Rev.

6 INSTRUCTIONS WARNINGB efore working on engine or equipment, disable engine as follows: 1) Disconnect spark plug lead(s). 2) Disconnect negative ( ) battery cable from battery. Accidental Starts can cause severe injury or and ground spark plug lead(s) before maintenance, replacement or repair of emission control devices and systems may be performed by any repair establishment or individual; however, warranty repairs must be performed by a Kohler authorized SCHEDULEW eekly Check heavy-duty air cleaner Cleaner/IntakeEvery 25 Hours or Annually Service /replace low-profi le Cleaner/IntakeEvery 100 Hours or Annually Replace low-profi le air cleaner Cleaner/Intake Change oil.

7 Lubrication System/Clutch Remove cooling shrouds and clean cooling Cleaner/Intake Check oil cooler fi ns, clean as necessary (if equipped).Lubrication SystemEvery 200 Hours Change oil fi System Replace fuel fi 250 Hours Replace heavy-duty air cleaner element and check inner Cleaner/IntakeEvery 300 Hours Change oil and fi lter (KOHLER PRO 10W-50 oil and KOHLER PRO fi lter only).Lubrication SystemEvery 500 Hours Replace heavy-duty inner air cleaner Cleaner/Intake Replace spark plugs and set SystemEvery 500 Hours Have crankshaft spline lubricated.

8 Perform these procedures more frequently under severe, dusty, dirty conditions. Have a Kohler authorized dealer perform this Service . Option only if using KOHLER PRO oil and PRO fi PARTSK ohler genuine Service parts can be purchased from Kohler authorized dealers. To fi nd a local Kohler authorized dealer visit or call 1-800-544-2444 ( and Canada).Maintenance424 690 06 Rev. RECOMMENDATIONSAll-season KOHLER PRO 10W-50 synthetic Oil is the ideal oil for KOHLER engines. It is specifi cally formulated to extend the oil and oil fi lter change interval to 300 Hours when paired with a KOHLER PRO Extended Life Oil oil and oil fi lter change intervals are exclusive to and only authorized on KOHLER engines that utilize both the KOHLER PRO 10W-50 synthetic Oil and KOHLER PRO Extended Life Oil Filter.

9 Alternative engine oils and oil fi lters may be used with KOHLER engines but require 100-Hour oil and 200-Hour oil fi lter change intervals for proper maintenance. Oil must be API (American Petroleum Institute) Service class SJ or higher. Select viscosity based on air temperature at time of operation as shown below. F-200203240605080100 C-30-20-10010203040 5W-3010W-30 SAE 30 Kohler PRO 10W-50 FUEL RECOMMENDATIONS WARNINGE xplosive Fuel can cause fi res and severe not fi ll fuel tank while engine is hot or is extremely fl ammable and its vapors can explode if ignited.

10 Store gasoline only in approved containers, in well ventilated, unoccupied buildings, away from sparks or fl ames. Spilled fuel could ignite if it comes in contact with hot parts or sparks from ignition. Never use gasoline as a cleaning : E15, E20 and E85 are NOT approved and should NOT be used; eff ects of old, stale or contaminated fuel are not must meet these requirements: Clean, fresh, unleaded gasoline. Octane rating of 87 (R+M)/2 or higher. Research Octane Number (RON) 90 octane minimum. Gasoline up to 10% ethyl alcohol, 90% unleaded is acceptable.