Shindaiwa Grass Trimmers, Brushcutters and Lawn Edgers All Model Service Manual

Q Shindaiwa Inc. 1994 1 Service Manual Shindaiwa Grass Trimmers, Brushcutters and Lawn Edgers Contents Section page 1 Model Designation and Identification ... 2 2 Troubleshooting ...................................... 8 3 Carburetors ............................................ 18 General Information ................................. 18 Troubleshooting Carburetors ................... 20 TK Carburetors ........................................ 25 Walbro Carburetors ................................. 34 4 Recoil Starters ....................................... 44 5 Ignition Systems .................................... 50 6 Clutches and Flywheels ........................ 58 7 Cylinders and Pistons ........................... 64 8 Engine Crankcase ................................. 72 9 Mufflers ................................................... 80 10 Mainshafts and Outer Tubes ................ 84 11 Gearcases .............................................. 94 12 Lawn Edgers ........................................ 102 13 Appendix .............................................. 104 Specifications ........................................ 104 Torque Values ........................................ 108 Tolerances and Wear Limits .................. 110 Fuel and Oil ........................................... 112 Metric Conversions ............................... 114 Special Service Tools ............................ 115

Q Shindaiwa Inc. 1994 2 Attention Statements Additional attention statements that are not preceded by the Attention Symbol are: IMPORTANT! A statement preceded by “IMPORTANT” is one that possesses special significance. NOTE: A statement preceded by “NOTE” contains information that is handy to know and may make your job easier. ☛ A statement preceded by a pointing finger is a tip, suggestion or other “trick of the trade” that just might ease your task. Throughout this manual are special “attention” statements surrounded by boxes and preceded by the triangular Attention Symbol: WARNING! A statement preceded by the word “WARNING” contains information that should be acted upon to prevent serious bodily injury. CAUTION! A statement preceded by the word “CAUTION” contains information that should be acted upon to avoid damaging your machine.

Q Shindaiwa Inc. 1994 3 F-18 Grass Trimmer SHINDAIWA ENGINE MODEL SER. NO. X X X X X X X X X X X X ACC-20 Located on the engine Typical nameplate location Typical identification placard locations ACC-22 F-20 Grass Trimmer F-230 Grass Trimmer F-21 Grass Trimmer Model Designation and Indentification Section 1 Curved-shaft Grass Trimmers MODEL ID

Q Shindaiwa Inc. 1994 4 Straight-shaft Grass Trimmers T-18 Grass Trimmer T-20 Grass Trimmer T-27 Grass Trimmer Section 1 Model Designation and Indentification MODEL ID T-230 Grass Trimmer T-250 Grass Trimmer T-25 Grass Trimmer

Q Shindaiwa Inc. 1994 5 Model Designation and Indentification Section 1 Brushcutters C-230 Brushcutter C-27 Brushcutter MODEL ID C-250 Brushcutter C-25 Brushcutter

Q Shindaiwa Inc. 1994 6 Section 1 Model Designation and Indentification C-35 Brushcutter B-45 Brushcutter BP-35 Brushcutter RC-45 Brushcutter Brushcutters MODEL ID

Q Shindaiwa Inc. 1994 7 Model Designation and Indentification Section 1 Lawn Edgers LE-230 Lawn Edger LE-250 Lawn Edger MODEL ID

Q Shindaiwa Inc. 1994 8 CRK-27 Section 2 Troubleshooting The 2-Stroke Cycle Engine Theory of Operation 1. Intake When the piston moves up toward the cylinder head, a vacuum is created in the crankcase. As the piston uncovers the intake port, the vacuum draws a fresh charge fuel-air mixrure into the crankcase. The fuel-air mixture accomplishes two functions before it is moved to the combustion chamber during the transfer process: ■ Oil in the fuel-air mix coats all internal parts including cylinder walls, crankshaft, and bearings. ■ In addition, the atomized fuel mixture absorbs heat as it enters the crankcase, lowering the engine’s operating tempera- tures. 2. Compression The piston continues to move upward, closing off all ports above the piston crown. The air-fuel mixture introduced during the previous revolution’s transfer cycle is now trapped in the combustion chamber and compressed. 3. Ignition As the piston approaches the cylinder head, the spark plug fires and ignites the fuel-air mixture. To compensate for increases in engine rpm, the spark timing is advanced electronically. Spark plug Compression/ Combustion Exhaust and transfer ports closed Intake port open Crankcase Vacuum Figure 2.1 Crankcase vacuum is created during the compression stroke. As the piston uncovers the intake port, a fresh fuel-air mixture is drawn into the crankcase. When the spark plug fires, the compressed mixture above the piston ignites and begins to expand. A two-stroke cycle or “two-cycle” engine produces one power stroke for every revolution of its crankshaft. Intake and compression occurs during the piston’s “up” stroke; power and exhaust occurs during the “down” stroke. Six distinct processes occur during every revolution of the crankshaft. Since a loss or weakness of even one of these processes will affect the other five, an understanding of them will go a long way toward accu- rately diagnosing problems during troubleshooting. TROUBLESHOOTING

Q Shindaiwa Inc. 1994 9 Troubleshooting The 2-Stroke Cycle Engine Section 2 CRK-26 Figure 2.2 The burning mixture expands, forcing the piston down and rotating the crankshaft. Continued piston movement compresses the fresh mixture in the crankcase. As the piston exposes the transfer port, crankcase pressure forces fresh mixture into the combustion chamber and helps push the remaining exhaust gasses through the exhaust port. Intake port closed Exhaust and transfer ports open 4. Power (combustion) The fuel-air mixture expands rapidly, forcing the piston down the cylinder. Piston movement is transferred to the crankshaft through the connecting rod, turning the crankshaft. 5. Exhaust Expanding gasses continue to force the piston downward. As the piston exposes the exhaust port, most of the spent combustion gasses are expelled through the port and out the muffler. 6. Transfer The piston’s downward movement covers the intake port and simultaneously opens the transfer port. That allows the compressed fuel-air mixture from Step 1 to enter the cylinder. As the fresh fuel-air mixture enters the cylinder, it also helps push or scavenge remaining exhaust gasses out through the exhaust port. TROUBLESHOOTING

Q Shindaiwa Inc. 1994 10 Section 2 Troubleshooting All Shindaiwa products are powered by high performance engines that produce the most horsepower from the lightest possible design. Two factors are critical to the service life and durabiity of any high performance engine: Factors That Affect Durability 1. Lubrication Proper lubrication is essential for reducing friction between an engine’s moving parts. By reducing friction, lubrication also helps reduce the heat developed during engine operation. Since a 2-cycle engine doesn’t have a reservoir of oil in its crankcase, a steady supply of high-quality lubricant must enter the engine with the fuel mixture. Refer to the Fuel and Oil Section of the Appendix for specific fuel/oil information. 2. Cooling Cooling any high performance engine is a complex task. To remove the heat generated from both friction and the combustion process, Shindaiwa engines rely on: ■ Lubricating Oil ■ Air-Fuel Mixture ■ Cylinder Fin Design ■ Flywheel Fan CAUTION! Proper lubrication and cooling are essential to both the performance and service life of any two-cycle engne! Even a partial failure in one or both of these areas can lead to engine seizure! TROUBLESHOOTING

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Shindaiwa Grass Trimmers, Brushcutters and Lawn Edgers All Model Service Manual

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