Stihl 4137 Series, Manual, Page: 2 / 58

1 Series 4137 Components - HT
q
© ANDREAS STIHL AG & Co. KG, 2005
Contents
1. Introduction 2
2. Safety 3
3. Specifications 4
3.1 Fuel System 4
3.2 Tightening Torques 5
4. Troubleshooting 7
4.1 Clutch, Chain Drive,
Chain Tensioner
7
4.2 Rewind Starter 8
4.3 Fuel System 9
4.4 Engine 11
5. Engine 12
5.1 Shroud 12
5.2 Clutch 12
5.3 Clutch Drum 14
5.4 Muffler/Spark Arresting
Screen
15
5.5 Removing and Installing
the Engine
16
6. Rewind Starter 16
6.1 General 16
6.2 Removing and
Installing
17
6.3 Rope Rotor/
Rewind Spring
18
6.4 Tensioning 19
6.5 Starter Rope 20
6.6 Starter Grip 20
6.7 Carrier/Pawl 21
7. AV System 22
7.1 Repair 22
8. Throttle Control 24
8.1 Control Handle
up to 1997
24
8.1.1 Throttle Trigger /
Interlock Lever
24
8.1.2 Detent/Torsion Spring 25
8.1.3 Throttle Cable 26
8.2 Control Handle
up to 2001
27
8.2.1 Throttle Trigger/
Interlock Lever
27
8.2.2 Slide Control 28
8.2.3 Throttle Cable 28
8.3 Control Handle
from 2002
29
8.3.1 Throttle Trigger/
Interlock Lever
29
8.3.2 Contact/Detent Spring 30
8.3.3 Throttle Cable 31
8.4 Adjusting the Throttle
Cable
32
9. Fuel System 32
9.1 Air Filter 32
9.2 Carburetor 33
9.2.1 Leakage Test 33
9.2.2 Removing and
Installing
34
9.2.3 Spacer Flange 35
9.3 Servicing the
Carburetor
36
9.3.1 Flange Mounting with
Oval End Cover
36
9.3.2 Flange Mounting with
Square End Cover
37
9.3.3 Metering Diaphragm 37
9.3.4 Inlet Needle 38
9.3.5 Fixed Jet 38
9.3.6 Pump Diaphragm 39
9.4 Adjusting the
Carburetor
39
9.4.1 Carburetor with Two
Adjusting Screws
39
9.4.2 Carburetor with
LD Screw
40
9.4.3 User Adjustment,
Carburetor with
Limiter Cap
41
9.4.4 Service Adjustment,
Carburetor with
Limiter Cap
42
9.5 Tank Vent 44
9.6 Pickup Body 45
9.7 Fuel Tank/Fuel Hoses 45
10. Drive Tube 47
10.1 Drive Shaft/
Flexible Liner (HT 70) 47
10.2 Removing and
Installing Drive Tube 48
10.3 Telescopic Drive Tube
(HT 75)
49
10.3.1 Removing and
Installing 49
11. Special Servicing
Tools
54
12. Servicing Aids 55