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Kohler LH630 - page 1
LH630, LH640, LH685, LH690, LH755, LH775 O WNER ' S M ANUAL L IQUID -C OOLED H ORIZONT AL C RANKSHAFT AEGIS ® ...
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Kohler LH630 - page 2
2 Safety Precautions W ARNING Explosive Fuel can cause fires and severe burns. Do not fill the fuel tank while the engine is hot or running . W ARNING Explosive Fuel! Gasoline is extremely flammable and its vapors can explode if ignited. Store gasoline only in approved containers, in well ventilated, unoccupied buildings, away from sparks or flames ...
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Kohler LH630 - page 3
3 Carbon Monoxide can cause severe nausea, fainting or death. A void inhaling exhaust fumes, and never run the engine in a closed building or confined area . W ARNING W ARNING Explosive Gas can cause fires and severe acid burns. Charge battery only in a well ventilated area. Keep sources of ignition away . Accidental Starts! Disabling engine. Accid ...
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Kohler LH630 - page 4
4 Figure 1. T ypical Kohler Aegis ® Carbureted Engine. Oil Recommendations Using the proper type and weight of oil in the crankcase is extremely important. So is checking oil daily and changing oil regularly . Failure to use the correct oil, or using dirty oil, causes premature engine wear and failure. Oil T ype Use high quality detergent oil of A ...
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Kohler LH630 - page 5
5 Figure 4. Oil Container Logo. Refer to Maintenance Instructions beginning on page 8 for detailed oil check, oil change, and oil filter change procedures. Fuel Recommendations W ARNING: Explosive Fuel! Gasoline is extremely flammable and its vapors can explode if ignited. Store gherasoline only in approved containers, in well ventilated, unoccupie ...
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Kohler LH630 - page 6
6 EP A CARB Category C 250 Hours Moderate 125 Hours Category B 500 Hours Intermediate 250 Hours Category A 1000 Hours Extended 500* Hours Figure 5. Engine Identification Label. The Emission Compliance Period referred to on the Emission Control or Air Index label indicates the number of operating hours for which the engine has been shown to meet Fed ...
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Kohler LH630 - page 7
7 4. A warm battery has much more starting capacity than a cold battery . 5. Use fresh winter grade fuel. NOTE: Winter grade gasoline has higher volatility to improve starting. Do not use gasoline left over from summer . St arting 1. Place the throttle control midway between the slow and fast positions. Place the choke control (non-EFI engines only ...
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Kohler LH630 - page 8
8 NOTE: D o not operate this engine continuously at angles exceeding 20° in any direction. Engine damage could result from insufficient lubrication. Cooling NOTE: I f debris builds up on the radiator, cooling system, or other external areas, stop the engine immediately and clean. Operating the engine with blocked or dirty cooling system areas can ...
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Kohler LH630 - page 9
9 Check Oil Level The importance of checking and maintaining the proper oil level in the crankcase cannot be overemphasized. Check oil BEFORE EACH USE as follows: 1. Make sure the engine is stopped, level, and is cool so the oil has had time to drain into the sump. 2. T o keep dirt, debris, etc., out of the engine, clean the area around the dipstic ...
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Kohler LH630 - page 10
10 6. Apply a thin film of clean oil to the rubber gasket on the new filter . 7. Install the new oil filter to the filter adapter . Hand tighten the filter (clockwise) until the rubber gasket contacts the adapter , then tighten the filter an additional 3/4 to 1 turn . 8. Fill the crankcase with new oil of the proper type, to the ‘‘F’’ mark ...
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Kohler LH630 - page 11
11 Figure 1 1. Radiator Drain Plug Location. Figure 10. Coolant Levels on Reservoir . Draining Cooling System 1. Stop the engine and allow it to cool sufficiently . 2. Check if the radiator is cool to the touch. Slowly loosen the radiator cap to the first stop and allow any pressure to bleed off. Then loosen it fully and remove it. Loosen/remove ra ...
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Kohler LH630 - page 12
12 Figure 15. Removing End Cap. Figure 14. Air Cleaner Element and Inner Element. NOTE: Operating the engine with loose, damaged, or missing air intake components can allow unfiltered air into the engine, causing premature wear and failure. T o Service Every 250 hours of operation (more often under extremely dusty or dirty conditions), replace the ...
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Kohler LH630 - page 13
13 3. After the main element is removed, check the condition of the inner element. It should be replaced whenever it appears dirty , typically every other time the main element is replaced. Clean the area around the base of the inner element before removing it, so dirt does not get into the engine. See Figure 17. Figure 17. Removing Inner Element. ...
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Kohler LH630 - page 14
14 Figure 20. Pulley and Drive Belt. 4. The drive belt is designed and constructed for this application. Do not use a substitute belt . Check the overall condition of the belt. If belt is cracked, damaged, or adequate tension does not exist, have necessary servicing performed by an authorized Kohler Engine Service Dealer . Clean Air Int ake/Cooling ...
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Kohler LH630 - page 15
15 EFI Engines: A special, high volume, high pressure filter with greater filtration capabilities and internal surface area is used. See Figure 24. NOTE: D o not clean the spark plug in a machine using abrasive grit. Some grit could remain in the spark plug and enter the engine, causing extensive wear and damage. 3. Check the gap using a wire feele ...
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Kohler LH630 - page 16
16 • Make sure the air cleaner element and precleaner are clean and properly secured. • Make sure the air intake screen, blower housing, and cooling surfaces of radiator are clean and free of dirt and debris. If, after checking the items listed above, the engine is hard to start, runs roughly , or stalls at low idle speed, it may be necessary t ...
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Kohler LH630 - page 17
17 T roubleshooting If the MIL comes on, or the engine becomes hard to start, runs roughly , or stalls at low idle speed, initial checks should be made in the following areas: • Make sure the fuel tank is filled with clean, fresh gasoline, and shut-off valve (if so equipped) is opened completely . • Make sure fuel tank vent cap is not blocked a ...
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Kohler LH630 - page 18
18 Specifications Model: .............................................................. LH630/LH640 ............ LH685/LH690 ............. L H7 55 .......................... LH775 Bore: ......................................... in. (mm) ....... 3.03 (77) ..................... 3.15 (80) ...................... 3.3 (83) .. ...................... 3.3 ( ...
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Kohler LH630 - page 19
19 KOHLER CO. FEDERAL AND CALIFORNIA EMISSION CONTROL SYSTEMS LIMITED W ARRANTY SMALL OFF-ROAD AND CLASS 1 LSI ENGINES The U.S. Environmental Protection Agency (EP A), the California Air Resources Board (CARB), and Kohler Co. are pleased to explai n the Federal and California Emission Control Systems W arranty on your off-road equipment engine. In ...
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Kohler LH630 - page 20
( 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 i n a reasonable amount of time, not to exceed 30 days. If you have any ques ...
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