Stihl 4180 Series Service Manual page 45

Contents
1 Safe diagnosis and repairs ............................
2 Safety Precautions.........................................
2.1 Protective Gloves............................................
2.2 Safety Glasses................................................
2.3 Spare Parts.....................................................
2.4 Preparations for Repair...................................
3 Troubleshooting .............................................
3.1 Clutch..............................................................
3.2 Rewind Starter ................................................
3.3 Ignition System ...............................................
3.4 Carburetor.......................................................
3.5 Engine.............................................................
4 Shroud ...........................................................
4.1 Tools, Servicing Aids ......................................
4.2 Removing the Shroud .....................................
4.3 Removing the Cover .......................................
4.4 Mounting the Cover ........................................
4.5 Installing the Shroud .......................................
5 Rewind Starter ...............................................
5.1 Special Servicing Tools, Servicing Aids..........
5.2 Removing the Rewind Starter.........................
5.3 Disassembling the Rewind Starter..................
5.4 Replacing the Rope Guide Bushing................
5.5 Installing the Rewind Spring ........................... 10
5.6 Assembling the Rewind Starter ...................... 10
5.7 Installing the Rewind Starter........................... 11
6 Fuel Tank ....................................................... 12
6.1 Special Servicing Tools, Servicing Aids.......... 12
6.2 Testing the Tank Vent..................................... 12
6.3 Removing the Tank Vent ................................ 13
6.4 Installing the Tank Vent .................................. 13
6.5 Cleaning the Fuel Tank................................... 13
6.6 Removing the Pickup Body............................. 13
6.7 Installing the Pickup Body............................... 13
6.8 Removing the Fuel Tank................................. 14
6.9 Installing the Fuel Tank................................... 14
6.10 Removing the Fuel Hoses .............................. 14
6.11 Installing the Fuel Hoses ................................ 14
6.12 Removing the Tank Cap ................................. 14
6.13 Installing the Tank Cap ................................... 14
7 Fan Housing, AV System............................... 15
7.1 Tools, Servicing Aids ...................................... 15
7.2 Removing the Fan Housing ............................ 15
7.3 Installing the Fan Housing .............................. 15
7.4 Removing Rubber Element............................. 15
7.5 Installing the Rubber Element......................... 16
7.6 Removing the Clutch Drum............................. 16
7.7 Installing the Clutch Drum............................... 16
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Series 4180 Powerhead
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8 Ignition System............................................... 17
8.1 Tools, Servicing Aids ...................................... 17
8.2 Removing the Flywheel .................................. 17
8.3 Installing the Flywheel .................................... 18
8.4 Testing Ignition Module with ZAT 3 Tester ..... 18
8.5 Testing Ignition Module with ZAT 4 Tester ..... 18
8.6 Removing the Ignition Module ........................ 19
8.7 Installing the Ignition Module .......................... 19
8.8 Removing Spark Plug Boot and Leg Spring ... 19
8.9 Installing Spark Plug Boot and Leg Spring ..... 19
8.10 Removing the Short Circuit Wire, Ground
Wire and Throttle Cable.................................. 20
8.11 Installing the Short Circuit Wire, Ground Wire
and Throttle Cable .......................................... 20
9 Clutch ............................................................. 21
9.1 Tools, Servicing Aids ...................................... 21
9.2 Removing the Clutch ...................................... 21
9.3 Disassembling the Clutch ............................... 21
9.4 Assembling the Clutch .................................... 22
9.5 Installing the Clutch ........................................ 22
10 Intake System ................................................ 23
10.1 Tools, Servicing Aids ...................................... 23
10.2 Disassembling the Intake System................... 23
10.3 Assembling the Intake System ....................... 24
11 Carburetor ...................................................... 26
11.1 Special Servicing Tools, Servicing Aids.......... 26
11.2 Adjust the Carburetor ..................................... 26
11.3 Testing Carburetor for Leaks .......................... 27
11.4 Choke Knob .................................................... 27
11.5 Metering Diaphragm and Manual Fuel Pump . 27
11.6 Inlet Needle .................................................... 28
11.7 Pump Diaphragm............................................ 28
11.8 Adjusting Screws ............................................ 29
11.9 Throttle Shaft with Lever................................. 29
11.10 Choke Shaft with Lever .................................. 30
11.11 Accelerator Pump ........................................... 30
12 Control Handle - Loop Handle ....................... 31
12.1 Special Servicing Tools, Servicing Aids.......... 31
12.2 Removing the Control Handle......................... 31
12.3 Fitting the Control Handle ............................... 31
12.4 Disassembling the Control Handle ................. 31
12.5 Assembling the Control Handle ...................... 32
13 Control Handle - Bicycle Handle.................... 34
13.1 Special Servicing Tools, Servicing Aids.......... 34
13.2 Removing the Control Handle......................... 34
13.3 Fitting the Control Handle ............................... 34
13.4 Disassembling the Control Handle ................. 34
13.5 Assembling the Control Handle ...................... 35
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