Technical Information · issue 47 of 2006
New STIHL HT 250 Pole Pruner
IssueTI 47/2006
Full text
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STIH)
Technical Information 47.2006
New STIHL HT 250 Pole Pruner – Series 4134
Contents
1. Technical Description
2. Specifications
3. Accessories
4. Service Accessories
5. Assembly Instructions
6. Spare Parts
7. Repairs
TI_47_2006_30_01_01.fm englisch / English USA
)m~ge 2 Technical Information 47.2006
The new HT 250 pole pruner extends the line of 2. Specifications
fixed length pole pruners.
The new unit is characterized by a high chain speed 2.1 Engine
and high torque. STIHL single cylinder two-stroke engine
Applications are the same as those of model HT 100 Displacement: 2.45 cu.in (40.2 cm3)
and HT 130 pole pruners. Bore: 1.57 in (40 mm)
Stroke: 1.26 in (32 mm)
Engine power to 2.1 bhp (1.6 kW)
1. Technical Description ISO 8893: at 9,000 rpm
Idle speed: 2,800 rpm
The powerhead and controls are the same as those
Rewind starter: Single pawl system
of the FS 250 R brushcutter.
Starter rope: 0.120 in dia.,
. Much higher chain speed for smoother cutting 33.5 in long
performance (3.0 mm dia., 850 mm)
. Powerful engine with high torque Clutch engages at: 4,300 rpm
Cut-off speed range
1.1 Controls without cutting
. Ergonomic control handle. attachment: 11,300 – 13,300 rpm
Max. speed of output
. Control handle with integral throttle cable
shaft (chain sprocket): 12,300 rpm
adjuster.
2.2 Ignition System
The shaft and gearbox are the same as those of the Ignition module: with integral electronic
HT 130 pole pruner. speed governor
Spark plug Bosch WSR 6F,
1.2 Boom (Drive Tube)
(resistor type): NGK BPMR 7A
. Boom with flexible drive shaft. Electrode gap: 0.020 in (0.5 mm)
. Reach about 11‘ 5“ (3.5 m)
1.3 Gearbox 2.3 Fuel System
. Gear ratio: 1:1 The STIHL engine features gasoline-oil lubrication
. Oil tank with toolless cap and must be run on a fuel mixture of gasoline and
air cooled two-cycle engine oil.
1.4 Standard Cutting Attachment Fuel:
. Length: 14“ (35 cm) see instruction manual
. Saw chain: PMN Fuel tank capacity:
21.6 oz. (640 cm3)
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Technical Information 47.2006 Page 3
Carburetor: 2.6 Cutting Attachment
All position diaphragm carburetor (C1Q-S83) with
Gear ratio: 1:1
integral fuel pump.
Guide bar: Rollomatic with
For carburetor adjustment see TI 09.2003 (FS 250).
nose sprocket
Low speed screw L Open 1 full turn Cutting length: 14“ (35 cm),
12“ (30 cm), option
High speed screw H Oilomatic chain: Picco-Micro-Mini
(standard setting with caps): Open 3/4 turn (no Pitch: 3/8"P (9.32 mm)
further than stop) Drive link gauge .043“ (1.1 mm)
Chain sprocket: Spur sprocket
(Basic setting without caps): Open 1 1/2 turns Pitch: 3/8"P (9.32 mm)
No. of teeth: 6,
2.4 Weight 7 (option)
Dry, without cutting Chain lubrication: Fully automatic,
attachment speed-controlled
rotary piston oil pump
HT 250: 13.4 lbs. (6.1 kg)
Oil tank capacity: 7.4 oz. (220 cm3)
2.5 Length (with cutting attachment)
HT 250 approx. 7‘ (214 cm)
3. Accessories
Shoulder Strap
Shoulder strap 4130 710 9000 can be used with the
HT 250.
30° Angle Drive
1 2
386TI003 KN
The 30° angle drive 4138 640 0201 is available for Position 1 is used for horizontal cuts (vertical
applications in which an angled cutting attachment branches and bushes), position 2 for a better view of
is an advantage in certain cutting situations. the cutting attachment.
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4. Service Accessories
4.1 Special Servicing Tools
Special tools are listed in the shop manual for
models STIHL FS 120, 200, 350, 450.
4.2 Servicing Aids
Part Name Part No. Application
Set of gaskets 4134 007 1050 Engine
Carburetor parts kit 1129 007 1062 Carburetor
Lubricating grease (8 oz/225 g 0781 120 1111 Oil seals
tube)
Gear lubricant 0781 120 1004 Gearbox
Gear lubricant (2.8 oz/80 g tube), 0781 120 1109, Drive shaft
Gear lubricant (8 oz/225 g tube) 0781 120 1110
Special lubricating oil 0781 417 1315 Rewind spring and bearing bore in rope rotor
Dirko HT red sealant 0783 830 2000 Sealing engine pan/cylinder
(3.2 oz / 90g tube)
STIHL Degreaser 7010 881 9401 Cleaning crankshaft stub and taper on flywheel
(32 US fl.oz. bottle, 6 per carton)
5. Assembly Instructions . Tighten the two clamp screws on the gearbox as
follows:
Pole pruners shipped from the factory are not
completely assembled. 1 = Tighten left-hand screw moderately
The gearbox has to be mounted on the HT 250. 2 = Tighten right-hand screw moderately
3 = Finally tighten left-hand screw
Warning! The engine may be started only with the (57in.lbs/6.5Nm)
shaft properly mounted – there is otherwise a risk of 4 = Finally tighten right-hand screw
engine damage and personal injury. (57in.lbs/6.5Nm)
Instruction sheet 0457 365 0016 describes the
1 2 complete assembly procedure for the HT 250.
3 4
6. Spare Parts
The illustrated parts list for the HT 250 pole pruner
will be available for the market launch.
246TI001 KN
. Mount the gearbox as shown in the instructions.
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Technical Information 47.2006 Page 5
7. Repairs
If the machine is started up in the course of Repair Description HT 250
repairs, it is essential to observe all country- 2 Replace crankcase, crankcase 100
specific safety regulations and the safety gasket or re-seal crankcase.
precautions outlined in the instruction manual. Includes air leak test.
3 Replace crankshaft main bearing(s). 100
7.1 Service Note Includes air leak test.
For servicing and repair procedures on the engine 4 Replace crankshaft seal(s). 60
refer to the shop manual for the STIHL FS 120, 200, Includes air leak test.
300, 350, 400, 450; see also STIHL Service Training 5 Perform engine air leak test. 40
System "Diagnosis". 6 Replace cylinder and/or piston. 55
For the gearbox see the STIHL CombiTool service Includes air leak test and repair of
manual. component(s) causing failure.
7 Replace ignition module or flywheel. 20
7.2 Tightening Torques Includes stop circuit test.
Tightening torques for the engine, shaft and 8 Replace fuel tank line, tank vent, or 10
gearbox are listed in the respective shop manuals. fuel pick-up body.
9 Replace intake manifold or intake 20
7.3 Replacing the Gearbox flange.
Use only the new gearbox 4182 640 0104 as a 10 Repair or replace carburetor. 30
replacement. The gearbox is marked “0104”. Includes fuel system testing.
Use gear lubricant 0781 120 1004 for lubrication of 11 Repair throttle control. 25
the gearbox. 12 Repair or replace rewind starter. 15
13 Repair or replace clutch, clutch 20
. Quantity of gear lubricant: 0.4 oz. (12 g)
shoes or clutch springs.
14 Replace muffler. 15
15 Replace air filter or filter housing. 10
7.4 Serial Number
16 Repair or replace stop switch. 20
Includes circuit testing.
17 Replace clutch housing. 20
18 Replace drive shaft and/or drive tube 20
assembly.
19 Replace bearings or liner in drive 20
tube.
20 Replace chain sprocket. 10
21 Replace gearbox assembly. 10
22 Replace fuel tank or oil tank. 15
275TI001 KN
26 Replace gears and/or bearings in 25
gearbox.
The serial number is located on the side of the fuel 27 Repair or replace oil pump. 20
tank – as shown. Includes oil output test.
40 Miscellaneous repairs and other 15
repairs not listed.
7.5 Repair Times 45 Handling allowance only-no labor. 5
The specified repair times assume that the work is 50 No labor. 0
performed by trained personnel in a properly
equipped service workshop.
The repair times are given in minutes.
The following table can be added to the STIHL
repair times table.
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© ANDREAS STIHL AG & Co. KG, 2006 Technical Documentation
D1/MTK-ja
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