Table Of Contents - Bosch PB-650 Service Manual

PB-650
PB-750
1 SERVICE INFORMATION ................................... 2
1-1 Specifications .................................................. 2
1-2 Technical data ................................................. 3
1-3 Torque limits .................................................... 4
1-4 Special repairing materials ............................. 5
1-5 Service limits ................................................... 6
1-6 Special tools ................................................... 7
2 STARTER SYSTEM ............................................ 8
2-1 Removing starter drum and rope .................... 9
2-2 Replacing rope guide .................................... 10
2-3 Installing rewind spring ................................. 10
2-4 Installing starter drum and rope ..................... 11
2-5 Increasing rope tension ................................ 12
2-6 Replacing starter pawl .................................. 12
3 IGNITION SYSTEM ........................................... 13
3-1 Troubleshooting guide .................................. 13
3-2 Testing spark ................................................. 14
3-3 Checking spark plug ..................................... 14
3-4 Replacing spark plug cap and coil ................ 15
3-5 Checking coil resistance ............................... 15
3-6 Checking ignition switch ............................... 16
3-7 Checking flywheel magnets .......................... 16
3-8 Replacing ignition coil ................................... 16
3-9 Setting pole shoe air gaps ............................ 17
3-10 Assembling dust cover and lead .................. 17
4 FUEL SYSTEM .................................................. 18
4-1 Cleaning air filter ........................................... 19
4-2 Checking fuel cap and strainer ..................... 19
4-3 Adjusting carburetor ..................................... 20
4-4 Testing carburetor ......................................... 21
4-5 Checking fuel tank and vent ......................... 22
4-6 Replacing fuel line and grommet .................. 22
4-7 Checking metering lever ............................... 23
4-8 Checking inlet needle valve .......................... 23
4-9 Checking diaphragm and others .................. 24
4-10 Removing main jet ........................................ 24
4-11 Checking pulse passages ............................. 25
4-12 (Option) Assembling heavy duty air cleaner kit .. 25
5 HANDLE AND CONTROL SYSTEM ................ 26
5-1 Adjusting handle position .............................. 26

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5-2 Removing handle .......................................... 26
5-3 Replacing throttle wire and switch ................ 27
5-4 Adjusting throttle control lever friction .......... 27
5-5 Assembling handle ....................................... 27
5-6 Positioning throttle wire and tube ................. 27
5-7 Adjusting throttle wire ................................... 28
5-8 (Option) Assembling static protection kit ...... 28
6 BACKPACK FRAME .......................................... 29
6-1 Replacing back cushion and harness ........... 29
6-2 Removing backpack frame ........................... 30
6-3 Checking rubber cushions ............................ 30
7 BLOWER SYSTEM ........................................... 31
7-1 Replacing elbow blowing pipe ...................... 31
7-2 Replacing fan case grid ................................ 32
7-3 Separating fan case and engine ................... 32
7-4 Assembling fan and fan case ....................... 33
7-5 Assembling engine unit on backpack frame ..... 34
8 ENGINE ............................................................. 35
8-1 Testing cylinder compression ....................... 35
8-2 Cleaning cooling air passage ....................... 36
8-3 Checking muffler and exhaust port of cylinder ... 36
8-4 Testing crankcase and cylinder sealings ...... 37
8-5 Checking cylinder ......................................... 38
8-6 Removing flywheel ....................................... 38
8-7 Checking woodruff key for flywheel .............. 38
8-8 Installing flywheel ......................................... 39
8-9 Checking piston and piston ring ................... 39
8-10 Disassembling crankcase ............................. 40
8-11 Removing main ball bearing and oil seal ..... 40
8-12 Assembling main ball bearing ...................... 41
8-13 Assembling crankshaft and crankcase ......... 41
8-14 Assembling oil seal ....................................... 42
8-15 Assembling piston rings on piston ................ 42
8-16 Installing piston ............................................. 43
8-17 Installing cylinder .......................................... 43
9 MAINTENANCE GUIDE .................................... 44
9-1 Troubleshooting guide .................................. 44
9-2 Service intervals ........................................... 46
9-3 Disassembly chart ........................................ 47
INDEX .................................................................... 48
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