Technical Information · issue 55 of 1999
HL 45: New Model Hedge Trimmer
IssueTI 55/1999
Full text
Page 1 of 6
Technical Information
55.1999
New Model HL 45 Hedge Trimmer - Series 4232
Contents
1. Technical Description
2. Specifications
3. Cutting Blades
4. Special Accessories
5. Service Accessories
6. Repairs
7. Spare Parts
The new HL 45 broadens the line of hedge trimmers The HL 45 is powered by the 4140 engine used in
and is an ideal unit for occasional applications. models FS 45, 55; FC 55; HS 45; BG 55, 65, 85; SH
55, 85. Angle drive, blade drive gear and cutting
The engine is accommodated in a compact housing
blades have been taken from the HL 75 (straight
which also incorporates the multi-function control
version).
handle.
Ergonomically designed controls and a favorable Typical applications are similar to those of the
power to weight ratio designed for easy handling HL 75 (straight version), but the reach of the
and less operator fatigue. HL 45 is about 75 cm (30 in.) less.
TI_55_1999_30_01.fm englisch / english Page 2 of 6
Page 2 Technical Information 55.1999
1. Technical Description
Crankshaft
. Composite pressed together to form torsionally
rigid assembly.
. Both ends supported in bearings.
Cylinder
. Four port technology (better mixture control,
clean combustion, lower emissions).
. Large cooling area.
Carburetor
. Only one adjusting screw (LD).
. Balanced idle system with fixed idle jet*.
. Fixed full-load jet
Air filter
. Long life filter material
. Large effective filter surface area
Exhaust muffler
. Dual-chamber muffler
Easy start® system
. Manual fuel pump
. ElastoStart™ (available as option)
Controls
. Multi-function control handle
Clutch
. Two clutch shoes without linings
Drive shaft
. Drive tube with rigid shaft supported in a flexible
liner
Gearbox
. Construction as HL 75
Cutting blades
. Double-edged for two-direction cutting
* Balanced idle system is described in detail in the “Carburetors” handbook.
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Technical Information 55.1999 Page 3
2. Specifications
2.1 Powerhead
2.1.1 Engine
Single cylinder two-stroke engine
Displacement: 27.2 cm3 (1.66 cu.in)
Bore: 34 mm (1.34 in)
Stroke: 30 mm (1.10 in)
Engine power to 0.75 kW (1 HP)
ISO 8893: at 7,000 rpm
Engine speeds: see 2.1.2
Rewind starter: Single pawl system
Starter rope: 3 mm (0.12 in) dia.,
800 mm (31.5 in) long
Clutch engages at: 3,800 rpm
2.1.2 Fuel System
Carburetor: All position diaphragm carburetor with integral fuel pump
Idle speed screw LD (standard setting) Open 2 full turns (see 6.1)
Idle speed 2,500 to 3,100 rpm
Cutoff speed range (electronic speed governor) 8,700 to 10,300 rpm
Fuel tank capacity: 0.3 L (10 fl.oz)
Fuel mix: Branded mid grade gasoline (leaded or unleaded) and STIHL two-stroke engine oil
Mix ratio: 50:1 with STIHL 50:1 two-stroke engine oil
2.1.3 Ignition System
Ignition module: with integral electronic speed governor
Spark plug Bosch WSR 6F, NGK BPMR 7 A or Champion RCJ 6Y
(suppressed):
2.2 Weight 5.9 kg (13 lb)
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Page 4 Technical Information 55.1999
3. Cutting Blades
Cutting length 500 mm (20“), double-edged, ground
to angle of 45°
4. Special Accessories
4.1 General
Part Name Part No. Application
ElastoStart™ 0000 190 3400 Rewind starter (grip with rope)
Starter rope 3.0 x 800 mm 0000 195 8200 Rewind starter, also for ElastoStart™
STIHL gear lubricant for hedge Drive shaft in tube, blade drive gear
trimmers
- 80 g tube 0781 120 1109
- 225 g tube 0781 120 1110
STIHL gear lubricant for Angle drive
brushcutters
- 80 g tube 0781 120 1117
- 225 g tube 0781 120 1118
5. Service Accessories
5.1 Special Servicing Tools
Special servicing tools are listed in the service manuals for the series 4140 powerhead and
STIHL 4140 power tool components.
5.2 Servicing Aids
Part Name Part No. Application
Carburetor parts kit 4227 007 1060 Zama C1Q S44
Set of gaskets 4140 007 1050 Engine
Dirko sealant 0783 830 2120 Engine pan/cylinder sealing faces
Electrician’s repair kit 5910 007 1050 Electrical system
Standard commercial solvent- Cleaning crankshaft stub
based degreasant containing no
chlorinated or hydrogenated
hydrocarbons
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Technical Information 55.1999 Page 5
6. Repairs
If the unit is started up, it is essential to strictly observe all local and national safety regulations and
the safety precautions outlined in the owner’s manual.
6.1 Carburetor Adjustment
Standard setting
. Checking cutting blades and clean if necessary (clean, move freely, not warped). Lubricate with a spray
lubricant.
. Check air filter and fit a new one if necessary
. Carefully screw down the idle speed screw (LD) counterclockwise (left-hand thread)
until it is against its seat, then open it two full turns clockwise.
Adjusting idle speed
. Carry out standard setting
. Start and warm up the engine
Engine stops while idling:
. Turn the idle speed screw (LD) clockwise until the cutting blades begin to move, then turn it back 1/2 turn.
Cutting blades move while engine is idling:
. Turn the idle speed screw (LD) counterclockwise until the cutting blades stop moving and then turn the
screw about another full turn in the same direction (counterclockwise).
Erratic idling behavior, poor acceleration:
. Turn the idle speed screw (LD) slowly counterclockwise no more than 1/2 turn.
Tightening torques
The tightening torques are listed in the workshop manuals for the series 4140 powerhead and
STIHL 4140 power tool components.
6.2 Service Note
The workshop manuals for the STIHL series 4140 powerhead and STIHL 4140 power tool components can be
used for servicing and repair procedures on model HL 45.
These workshop manuals do not include the chapters "Servicing the Carburetor", "Troubleshooting" or any
repairs involving standard procedures. Such procedures are described in separate handbooks, i.e.
“Carburetors” and "Standard Repairs, Troubleshooting".
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Page 6 Technical Information 55.1999
6.3 Repair Times .
The specified repair times assume that the work is Code Type of Repair HL 45
performed by trained personnel in a properly 1 Crankcase, Crankshaft, 0.9
equipped service workshop. Crankshaft Bearings
2
3 Crankcase Gasket/Sealing 0.8
The repair times are given in tenths of an hour
4 Crankshaft Seals 0.9
(0.1 = 6 minutes).
(Includes pressure & vacuum testing)
5 Cylinder and/or Piston 0.9
Note: This table for model HL 45 can be added to
6 Ignition Module 0.5
the STIHL repair times table.
7 Fuel Hose 0.5
8 Replace Gear Box Cover 0.5
9 Repair/Rebuild Carburetor 0.8
10 Replace Carburetor, Carburetor 0.4
7. Spare Parts Jet (if tried to repair use code 9)
An illustrated parts list is available for the new 11 Throttle Handle, Throttle Control, 0.6
model. Throttle Cable
12 Recoil Starter 0.5
13 Clutch 0.7
14 Cutter Bar 0.5
15 Muffler 0.4
16 Air Filter, Filter Cover, Tank Cap, 0.4
Tank Vent, Fuel Filter, Spark Plug,
Miscellaneous Minor Repairs
17 Stop Switch 0.6
18 Fuel Tank 0.4
19 Repair Gear Box, Gears/Bearings 0.8
20 All Other Repairs 0.5
✂
© 1999 Andreas STIHL AG & Co. Technical Documentation
Waiblingen D1/MTK-sc 6787
TI_55_1999_30_01.fm Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.