Technical Information · issue 17 of 2001
New Model FR 85 T Backpack Brushcutter
Model FR tool Sound Sound Vibration Vibration
IssueTI 17/2001
Full text
Page 1 of 8
Technical Information
17.2001
New Model FR 85 T Backpack Brushcutter – Series 4137
Contents
1. Technical Description
2. Specifications
3. Tools
4. Accessories
5. Service Accessories
6. Repairs
7. Spare Parts
The new FR 85 T (T = split boom) backpack The following Multi-Cut attachments are currently
brushcutter extends the line of units for landscape available: BC, FC, FH, HL (0°, 30° and 0 ... 90°)
maintenance. and HT.
The quick-action coupling on the shaft enables a The engine (series 4137 powerhead) and the
number of different attachments from the STIHL ergonomically designed controls are exactly the
Multi-Cut system to be used to broaden the range of same as those of the STIHL FR 85.
possible applications and make transportation more
convenient. Recommended applications are the same as those
for the respective STIHL single-purpose power
The quick-action coupling is designed in such a way tools.
that the shafts engage without having to be turned
back and forth.
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)m~ge 2 Technical Information 17.2001
1. Technical Description
Engine, gearhead, controls and handle system are
the same as those of the STIHL FR 85.
Split boom / drive shafts
. Quickly disassembled to save space for
transportation
. Rigid shafts
393TI005 KN
2. Specifications
2.1 Powerhead
2.1.1 Engine
Single cylinder two-stroke engine
Displacement: 25.4 cm3
Bore: 34 mm
Stroke: 28 mm
Engine power to 0.95 kW (1.3 hp)
ISO 8893: at 8,500 rpm
Engine speeds: see 2.1.2
Rewind starter: Single pawl system
Starter rope: 3 mm dia., 800 mm long
Clutch: engages at: 3,700 rpm
Model FR tool Sound Sound Vibration Vibration
or pressure level power level measurement measurement
Multi-Cut Lpeq Lweq to ISO 7916 to ISO 7916
attachment to to Idle speed Max. RPM
ISO 7917 1) ISO 108841) (m/s2) (m/s2)
Handle Handle
dB (A) dB (A) right left right left
FR 85 T Cutting head 92 106 0.8 0.5 2.7 2.4
FR 85 T Metal tool 89 103 0.6 0.5 3.3 1.8
FR 85 T Multi-Cut 88 ... 96 103 ... 107 0.5 ... 0.8 0.4 ... 1.6 2.6 ... 6.6 1.8 ... 4.1
attachment
1) Weighted equivalent level includes idling and racing with the same duration of exposure
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) 9,700 to 11,300 rpm
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Technical Information 17.2001 Page 3
Fuel tank capacity: 0.44 L (440 cm3)
Fuel mix: Regular grade gasoline (leaded or unleaded) and two-stroke engine oil
Mix ratio: 50:1 with STIHL 50:1 two-stroke engine oil
25:1 with other brand-name two-stroke engine oils
2.1.3 Ignition System
Ignition module: with integral electronic speed
governor
Spark plug Bosch WSR 6F,
(suppressed): NGK BPMR 7 A or
Champion RCJ 6Y
2.2 Weight
without cutting tool and deflector
FR 85 T: 9.6 kg
3. Tools
3.1 FR Cutting Tools
1 2
The following cutting tools are approved
1 STIHL SuperCut 20-2 4002 710 2162
2 STIHL AutoCut 21-2 4002 710 2113
3 STIHL AutoCut 25-2 4002 710 2108 3 4
4 STIHL TrimCut 30-2 4002 710 2122
5 STIHL PolyCut 20-3 4002 710 2130 5
6 Cutting blade 230-2* 4001 713 3805
7 Cutting blade 230-4* 4001 713 3801
8 Cutting blade 230-8* 4001 713 3803
9 Brush knife 250-3* 4112 713 4100
6 7
* Not approved for
loop handle FR 85 T
without barrier bar
8 9
265TI004 KN
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3.2 Multi-Cut Attachments
Basic unit:
1 FR 85 T (shown without FS attachment)
2 BC cultivator * Note:
3 FC edger No other power tool attachments may be mounted
4 FH power scythe to the short stub shaft (approx. 42 cm) of the HL 0°
5 HL 0° hedge trimmer* hedge trimmer attachment.
6 HL 30° hedge trimmer
7 HL 0 ... 90° hedge trimmer
8 HT pole pruner
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Technical Information 17.2001 Page 5
4. Accessories
4.1 General
Part Name Part No. Application
ElastoStart 0000 190 3400 Rewind starter (grip with rope)
Starter rope 0000 195 8200 Rewind starter
STIHL gear lubricant for hedge Drive shafts in tube, flexible shaft
trimmers
- 80 g tube 0781 120 1109
- 225 g tube 0781 120 1110
STIHL gear lubricant for Gearhead
brushcutters
- 80 g tube 0781 120 1117
- 225 g tube 0781 120 1118
STIHL special oil Rewind spring in starter,
- 100 ml bottle 0781 417 1315
bearing bore in rope rotor
4.2 Nylon Line for Cutting Heads
Line diameter / Color Application
2.4 mm / orange SuperCut 20-2, AutoCut 21-2, AutoCut 25-2, TrimCut 30-2, PolyCut 20-3
2.7 mm / red PolyCut 20-3
5. Service Accessories
5.1 Special Servicing Tools
Special servicing tools are listed in the service manuals for STIHL FS 75, 80, 85, FC 75, HL 75 (powerhead,
controls, gearhead), STIHL FR 350, 450 (support frame) and the appropriate STIHL single-purpose power tools
for the Multi-Cut attachments.
5.2 Servicing Aids
Part Name Part No. Application
Carburetor parts kit 4227 007 1060 Zama
Grease 0781 120 1111 Oil seals
- 225 g tube
Dirko sealant 0783 830 2120 Engine pan/cylinder sealing faces
Set of screws 5910 007 1060 Replacement screws and nuts
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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)m~ge 6 Technical Information 17.2001
6. Repairs
If the unit is started up in the course of repairs, it is essential to strictly observe all country-specific
safety regulations and the safety precautions outlined in the owner’s manual.
6.1 Replacing and lubricating the shafts
6.1.1 Lower part of drive tube
. Loosen the wing screw (1), pull the lower part of
the drive tube (2) out of the coupling sleeve (3). 3 2
. Remove the gearhead/attachment from the
drive tube.
393TI008 KN
. Press down the lock button and hold it there, pull
the drive shaft (4) with sleeve (5) out of the drive
tube (applying pressure to other end of the shaft
simplifies this operation).
If the shaft has turned blue, install a new one.
. Coat the drive shaft with STIHL gear lubricant 5 4
for hedge trimmers, never pump grease into the
drive tube.
393TI009 KN
. Push drive shaft (4) and sleeve (5) into the drive
tube.
. Press down the lock button and push the sleeve
(5) home as far as stop (lock button must snap
into position).
. Fit and line up the gearhead/attachment.
6.1.2 Upper part of drive tube
. Loosen the clamp screw (6) and pull the
coupling sleeve (7) off the drive tube. Press
down the lock button and hold it there, pull the
drive shaft (8) with sleeve (9) out of the drive
tube. 6 7
If the shaft has turned blue, install a new one.
. Coat the drive shaft with STIHL gear lubricant
393TI010 KN
for hedge trimmers, never pump grease into the
drive tube.
9 8
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Technical Information 17.2001 Page 7
. Push the drive shaft (8) and sleeve (9) into the
drive tube. Press down the lock button and push
the sleeve (9) home as far as stop (lock button
must snap into position) - it may be necessary to
turn the shaft back and forth in this process.
9 8
. Push the coupling sleeve (7) on to the drive tube
as far as stop – the lug must engage the slot –
and line up so that the gap in the clamp and the
machine support face downwards.
393TI011 KN
.
Tighten down the clamp screw (6) firmly.
. Refit the lower part of the drive tube with the
6 7
gearhead/attachment.
6.2 Tightening Torques
Tightening torques are listed in the service manuals
for STIHL FS 75, 80, 85, FC 75, HL 75 (powerhead,
controls, gearhead), STIHL FR 350, 450 (support
frame) and the manuals of the appropriate STIHL
single-purpose power tools for the Multi-Cut
attachments.
6.3 Service Note
Refer to the following service manuals for servicing
and repair procedures: STIHL FS 75, 80, 85, FC 75,
HL 75 (powerhead, controls, gearhead), STIHL FR
350, 450 (support frame) and the manuals of the
appropriate STIHL single-purpose power tools for
the Multi-Cut attachments
These service 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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6.4 Repair Times .
The specified repair times assume that the work is Repair procedure FR 85 T
performed by trained personnel in a properly 1 Remove and refit engine 20
equipped service workshop.
2 Crankcase, pressure test* 110
The repair times are given in minutes. 3 Crankshaft, bearings, 110
Note: This table for the FR 85 T can be added to the pressure test*
STIHL repair times table. 4 Sealing rings, pressure test* 70
5 Crankcase leakage test, test run 40
6 Cylinder, piston, pressure test* 55
7 Ignition system, contact* 10
8 Fuel supply, tank vent, 10
7. Spare Parts
test run
The spare parts for the FR 85 T and the Multi-Cut 9 Manifold or flange, -
attachments are included in the illustrated parts lists pressure test
for the equivalent single-purpose units. 10 Carburetor, check* 30
11 Handle and throttle control 10
12 Rewind starter, test run 15
13 Clutch, test run 20
14
15
Muffler
Air filter
10
5
16 Stop switch, test run 10
17 Clutch housing 20
18 Drive tube 25
19 Replace gearhead or bearing 5
housing
20 Limit stop or deflector 10
21 Drive shaft 15
22 Fuel tank 20
23 Check compression pressure -
24 Adjust valve clearance -
25 Replace crankcase, -
bottom half
26 Replace crankshaft -
27 Replace cylinder, piston -
28 Oil supply -
29 Oil pump, test run -
✂
* Test run under load
© 2000 Andreas Stihl AG & Co. Technical Documentation
Waiblingen D1/MTK-na 7175
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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.