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OWNER'S MANUAL
AEGIS®
LH630, LH640, LH685, LH690, LH755, LH775
LIQUID-COOLED
HORIZONTAL CRANKSHAFT
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Safety Precautions To ensure safe operations please read the following statements and understand their meaning. Also refer to your equipment owner's manual for other important safety information. This manual contains safety precautions which are explained below. Please read carefully. WARNING Warning is used to indicate the presence of a hazard that can cause severe personal injury, death, or substantial property damage if the warning is ignored. CAUTION Caution is used to indicate the presence
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Safety Precautions (Cont.) WARNING WARNING WARNING Explosive Gas can cause fires and Accidental Starts can cause severe Carbon Monoxide can cause severe nausea, fainting or death. severe acid burns. injury or death. Avoid inhaling exhaust fumes, Charge battery only in a well Disconnect and ground spark plug and never run the engine in a ventilated area. Keep sources of leads before servicing. ignition away. closed building or confined area. Accidental Starts! Lethal Exhaust Gases! Explosive Gas!
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Heavy-Duty Air Cleaner Reservoir Oil Fill Dipstick Cap Rectifier- Regulator Spark Plug Spark Plug Electric Starter Radiator Oil Filter Oil Drain Plug Oil Drain Plug Figure 1. Typical Kohler Aegis Carbureted Engine. ® Heavy-Duty Air Cleaner Reservoir Radiator Fuel Injector Ignition Coil ECU Fuse Holders Wire Harness Figure 2. Typical Kohler Aegis EFI Engine. ® Oil Recommendations Using the proper type and weight of oil in the crankcase is extremely important. So is checking oil ** * daily and cha
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NOTE: Synthetic oils meeting the listed Unleaded gasoline is recommended as it leaves less classifications may be used with oil changes combustion chamber deposits and reduces harmful performed at the recommended intervals. exhaust emissions. Leaded gasoline is not However to allow piston rings to properly recommended and must not be used on EFI engines, or seat, a new or rebuilt engine should be on other models where exhaust emissions are operated for at least 50 hours using standard regulated.
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Refer to certification label for engine displacement. For Models LH630, LH640, LH685, LH690 Exhaust Emission Control System for models LH630, IMPORTANT ENGINE INFORMATION LH640, LH685, LH690 and LH755 is EM. Exhaust THIS ENGINE MEETS U.S. EPA PH2, EC STAGE II Emission Control System for model LH775 is EM, O2S, (SN:4) AND CA 2008 AND LATER EXH EMISSION ECM, MFI. REGS FOR SI SORE FAMILY Model Designation TYPE APP Model LH690 for example: L designates liquid cooled, DISPL. (CC) H designates horizon
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4. A warm battery has much more starting If the starter does not turn the engine over, shut capacity than a cold battery. off starter immediately. Do not make further attempts to start the engine until the condition is 5. Use fresh winter grade fuel. NOTE: Winter grade corrected. Do not jump start using another gasoline has higher volatility to improve battery (refer to Battery on page 7). See your starting. Do not use gasoline left over from Kohler Engine Service Dealer for trouble analysis. su
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NOTE: Do not operate this engine continuously at 3. Check the system for external leaks. angles exceeding 20° in any direction. Engine damage could result from insufficient 4. If the cause is none of the above or cannot be lubrication. identified, contact an Authorized Kohler Engine Dealer for appropriate diagnosis and correction. Cooling NOTE: If debris builds up on the radiator, cooling WARNING: Hot Parts! system, or other external areas, stop the Engine components can get extremely hot from o
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NOTE: To prevent extensive engine wear or Check Oil Level damage, always maintain the proper oil The importance of checking and maintaining the level in the crankcase. Never operate the proper oil level in the crankcase cannot be engine with the oil level below the “L” overemphasized. Check oil BEFORE EACH USE as mark or over the “F” mark on the follows: dipstick. ™ Oil Sentry 1. Make sure the engine is stopped, level, and is cool Some engines are equipped with an optional Oil so the oil has had
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• To prevent engine damage, do not use anti-freeze 6. Apply a thin film of clean oil to the rubber gasket with stop-leak additive(s) or put other additives on the new filter. in the cooling systems. 7. Install the new oil filter to the filter adapter. Hand Maintenance tighten the filter (clockwise) until the rubber This engine is liquid-cooled, circulating a mixture of gasket contacts the adapter, then tighten the filter ethylene glycol and water for dependable operation. A an additional 3/4 to
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3. If equipped, remove the coolant drain plugs located on each side of the engine block. See Figure 12. Drain the coolant into a suitable container. After the coolant has drained completely, apply ® ® pipe sealant with Teflon (Loctite No. 592 or equivalent), to the threads and reinstall the plugs. Torque the two plugs to 36.7 N·m (325 in. lb.). Figure 10. Coolant Levels on Reservoir. Coolant Drain Plug Draining Cooling System 1. Stop the engine and allow it to cool sufficiently. 2. Check if the
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2. Reinstall and tighten the radiator cap. 3. Start and run the engine for five minutes, or until it reaches operating temperature. Stop the engine and allow it to cool. Inner Element 4. Drain the cooling system (Refer to Draining Cooling Systems). 5. Fill the cooling system (see Filling Cooling System). Air Cleaner Element Filling Cooling System 1. Check the condition of cooling system hoses, Figure 14. Air Cleaner Element and Inner Element. clamps, and associated components. Replace as require
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3. After the main element is removed, check the Air Intake System and Air Cleaner condition of the inner element. It should be Components replaced whenever it appears dirty, typically every other time the main element is replaced. Air Cleaner Housing/End Cap Assembly Clean the area around the base of the inner Make sure air cleaner housing including the dust element before removing it, so dirt does not get ejector valve and the end cap is in good condition and into the engine. See Figure 17. not
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3. The v-groove of each pulley (upper and lower) NOTE: Operating the engine with a restricted air should not be bent, nicked, or damaged. Pulley intake screen or radiator, damaged/broken fan mounting areas and lower pulley shims should assembly, or missing fan shroud will cause be free of any cracks or elongation. See Figure 20. engine damage due to overheating. Ignition System Carbureted Engines - Use an electronic Capacitive Discharge (CD) ignition system. Other than periodically checking/repl
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NOTE: Do not clean the spark plug in a machine EFI Engines: A special, high volume, high pressure using abrasive grit. Some grit could filter with greater filtration capabilities and internal remain in the spark plug and enter the surface area is used. See Figure 24. engine, causing extensive wear and damage. Fuel Filter 3. Check the gap using a wire feeler gauge. Adjust the gap to 0.76 mm (0.030 in.) by carefully bending the ground electrode. See Figure 23. 4. Reinstall the spark plug into the
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• Make sure the air cleaner element and precleaner Carburetor Troubleshooting and are clean and properly secured. Adjustments In compliance with the government emission • Make sure the air intake screen, blower housing, standards, the carburetor is calibrated to deliver the and cooling surfaces of radiator are clean and free correct fuel-to-air mixture to the engine under all of dirt and debris. operating conditions. The carburetor cannot be adjusted, except for low idle speed (RPM). Carburetor
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Troubleshooting *NOTE: The actual low idle speed depends on the If the MIL comes on, or the engine becomes hard to application -- refer to equipment start, runs roughly, or stalls at low idle speed, initial manufacturer's recommendations. checks should be made in the following areas: When an EFI engine is started cold, the ECU will be • Make sure the fuel tank is filled with clean, fresh using internal programming for cold running, and the gasoline, and shut-off valve (if so equipped) is idle sp
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5. Remove the spark plugs. Add one tablespoon of Storage engine oil into each spark plug hole. Install plugs, If the engine will be out of service for two months or but do not connect the plug leads. Crank the more, use the following storage procedure: engine two or three revolutions. 1. Clean the exterior surfaces of the radiator and 6. On units with EFI engines, disconnect the engine. On EFI engines, avoid spraying water at negative (-) battery cable or use a "battery the wiring harness or any
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LIMITED 3 YEAR KOHLER AEGIS ENGINE WARRANTY ® Kohler Co. warrants to the original retail consumer that each new KOHLER AEGIS engine sold by Kohler Co. will be free from ® manufacturing defects in materials or workmanship in normal residential service for a period of three (3) years from date of purchase, provided it is operated and maintained in accordance with Kohler Co.’s instructions and manuals. Our obligation under this warranty is expressly limited, at our option, to the replacement or rep
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(c) For warranty repairs, the engine must be presented to a Kohler Co. service center as soon as a problem exists. Call 1-800-544-2444 or access our website at: www.kohlerengines.com, for the names of the nearest service centers. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days. If you have any questions regarding warranty rights and responsibilities, you should contact Kohler Co. at 1-920-457-4441 and ask for an Engine Service representative. COVERA
