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FS 75

FS 80 R FS 85 R

FS 80 RB FS 85 RB

FS 80 FS 85

R = Loop handle B = Barrier bar

These new brushcutters are further developments of models FS 72, 74 and 76. The engine installed in the three models is exactly the same as that installed in model BG 75 blower and the HS 75, 80, 85 hedge trimmers.

This powerhead has a displacement of 25.4 cm3 (1.55 cu.in) and a power output of 0.9 kW (1.2 bhp). The new units can be used for the same range of applications as models FS 72, 74, 76.

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&RQWHQWV 1. 2. 3. 4. 5. 6. 7. Technical Description Specifications Cutting Tools Special Accessories for User Service Accessories Repairs Replacement Parts

2QO\ WKH GLIIHUHQFHV EHWZHHQ PRGHOV )6 DQG PRGHOV )6 DUH GHVFULEHG LQ WKH IROORZLQJ )RU IXUWKHU LQIRUPDWLRQ VHH 7, PRGHOV )6 DQG 7HFKQLFDO 'HVFULSWLRQ &UDQNVKDIW · Durable machined design &\OLQGHU · Four port technology (better mixture control, cleaner combustion, lower emissions). · Larger cooling area &DUEXUHWRU · Fixed high speed jet with one idle mixture adjusting screw (L; see table 2.1.2) $LU ILOWHU · Improved filter material · Larger effective filter surface area

· Two-chamber muffler · Spark arresting screen easier to remove and

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· With ElastoStart starter grip · 1HZ control handle, functions as on · Control handle with two short circuit wires (1) or

with one short circuit wire (2) on ignition module. Throttle cable performs functions of short circuit wires in version with one wire on the ignition module. Fewer component parts STIHL FS 72, 74, 76, 86, 88, 106, 108.

STOP START

·

&OXWFK · Three clutch shoes without linings

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'ULYH VKDIW · )6 flexible shaft, )6 rigid shaft, supported in a protective tube on all models. &XWWLQJ WRRO PRXQWLQJ · )6 output shaft (4), as STIHL FS 72 with M12 right-hand thread; )6 output shaft (3), as STIHL FS 74, 76, 86, 88, 106, 108 with M10 x 1 left-hand thread.

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(QJLQH Displacement: Bore: Stroke: Engine power to ISO 8893: Engine speeds: Rewind starter: Starter rope: Clutch diameter: Clutch engages at: 25.4 cm3 (1.55 cu.in) 34 mm (1.34 in) 28 mm (1.10 in) 0.9 kW (1.2 bhp) see 2.1.2 Single pawl system; ElastoStart grip see 4. 66.5 mm (2.62 in) 3,700 rpm

Model

Sound pressure level Lpeq to ISO 7917 1) dB (A) Cutting hd. Cutting hd. Metal tool Cutting hd. Metal tool

Sound power level Lweq to ISO 108841) dB (A) 97 98 91 97 92

FS 75 FS 80 FS 80 FS 85 FS 85

1)

Data includes idling and full throttle/no load with the same duration of exposure

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)XHO 6\VWHP Carburetor: All position diaphragm carburetor with integral fuel pump

B

C

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&46$ FDUEXUHWRU B = Idle fixed jet, 0.32 mm diam. C = Valve jet with integral fixed jet, 0.41 mm diam.

6HWWLQJV Low speed screw / (standard setting) Idle speed High speed screw + (standard setting) Cut-off speed (without cutting tool) Max. output shaft speed (rated) * with gear ratio of 1:1.4 FS 75 FS 80, 85* &46$ =DPD Open 1 turn 2800 rpm QRQH 9500 to 11500 rpm 8500 rpm 7500 rpm

Fuel capacity: ,JQLWLRQ 6\VWHP Ignition timing: Length of ignition lead: Spark plug (suppressed):

0.44 l (0.9 US pt)

1.55 - 2.25 mm (0.060 - 0.090 in) B.T.D.C. at 8000 rpm 160 mm (6.3 in) Bosch WSR 6F, NGK BPMR 7 A or Champion RCJ 6Y

*HDUKHDG )6 Start of production 1:1.33, later 1:1.4

Gear ratio: :HLJKW

FS 75 without cutting tool and deflector 4.0 kg (8.8 lb)

FS 80 R 4.8 kg (10.6 lb)

FS 80 5.0 kg (11.0 lb)

FS 85 R 4.9 kg (10.8 lb)

FS 85 5.1 kg (11.2 lb)

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The following cutting tools are approved for use with these brushcutters: STIHL Supercut 10-1 cutting head 1) 4004 710 2110 STIHL Supercut 20-2 cutting head 2) 4002 710 2162 STIHL Autocut 11-2 cutting head 1) 4004 710 2105 STIHL Autocut 25-2 cutting head 2) 4002 710 2108 STIHL Autocut 30-2 cutting head 2) 4002 710 2107 STIHL Polymatic 30-2 cutting head 2) 4002 710 2120 STIHL Polycut 10-3 cutting head 1) 4004 710 2130 STIHL Polycut 20-3 cutting head 2) 4002 710 2130 Cutting blade 230-4 3) 4001 713 3801 Cutting blade 230-8 3) 4001 713 3803 Brush knife 250-3 3) 4112 713 4100 Circular saw blade 200 (scratcher tooth) 4) 4112 713 4201 Circular saw blade 200 (chisel tooth) 4) 4112 713 4203

1) 2) 3)

FS 75 FS 80, 85: all versions FS 80, 85: use only with barrier bar or bike handle 4) FS 80, 85: only for bike handle version

6SHFLDO $FFHVVRULHV IRU 8VHU Part No. 4119 790 3906 4119 790 3901 0000 190 3400 0000 195 8200 Application, Remarks Cutting blade 230-4, 230-8, brush knife 250-3 Circular saw blade 200 (scratcher/chisel tooth) Rewind starter (grip with rope) Rewind starter Drive shaft Gearhead

Part Name Transport guard for metal cutting tools ElastoStart grip ElastoStart grip

STIHL multipurpose grease - Tube 80 g (3 oz) 0781 120 1109 STIHL gear lubricant - Tube 80 g (3 oz) 0781 120 1117

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1\ORQ /LQH IRU &XWWLQJ +HDGV Application Autocut 11-2 Supercut 10-1, Supercut 20-2, Autocut 25-2, Autocut 30-2, Polymatic 30-2, Polycut 10-3, Polycut 20-3 Polycut 10-3, Polycut 20-3

Line diam. / color .080 in/ green .095 in/ orange .105 in/ red

6KDUSHQLQJ $LGV IRU 0HWDO &XWWLQJ 7RROV Part No. 4020 893 5000 Application Circular saw blade 200 (chisel tooth)

Part Name Saw set

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Item Part Name 1 2 3 4 5 Installing tool; including items 2 and 3 Sleeve Spindle Radial seal puller; including item 5 Spindle

Part No. 5910 890 2202 5910 893 1700 5910 893 8501 5910 890 4400 5910 890 8400

Application Installing crankshaft

Rem.

Oil seals

1)

1) Original spindle of puller 0000 890 4400 can be replaced by spindle 5910 890 8400, which is 20 mm (0.80 in) longer. The original puller is then exactly the same as puller 5910 890 4400.

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Use special servicing tools for FS 72, 74, 76 for all other operations not mentioned below. Part Name Press sleeve Assembly sleeve Press sleeve Installing tool Installing tool Service tool ZS including - Installing tool - Sleeve (1x; 30 mm) - Sleeve (2x; 35 mm) 1) 2) 3) 4) Part No. 1115 893 4600 4112 893 2400 4112 893 2401 4126 893 4900 5910 890 2208 5910 007 2220 5910 893 1701 5910 893 1702 Application Installing the oil seal (starter side) Protecting the oil seal (starter side) Installing the oil seal (clutch side) Removing rubber AV element and AV sleeve Fitting hookless snap rings in piston Removing the crankshaft 5910 890 2220 4) 4) Rem.

1) 2)

Drive tube diameter: 25.4 mm (1") See modification 5.1.2.1 See modification 5.1.2.2 Part must be acquired for new models

0RGLILFDWLRQ RI LQVWDOOLQJ WRRO The latest factory-supplied version of installing tool 5910 890 2208 has been modified for use in models FS 75, 80, 85. Existing installing tools can be modified as shown in the drawing on the right.

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35,5 (1,398")

17,3 (0.681")

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0RGLILFDWLRQ RI LQVWDOOLQJ WRRO In future, the factory-supplied installing tool 5910 890 2208 will come with six additional 5.5 mm (7/32") holes for use on models FS 75, 80, 85. Existing installing tools which do not have these holes can be modified with the aid of the scale template on the last page of this TI. To mark the new holes, copy the template, cut it out and place it on the underside of the flange. Stamp the numbers 14 and 15 next to the holes on the top side of the flange. Apply new notches to the periphery of the flange and stamp the numbers 14 and 15 next to them. The illustration on the right shows the top side of the new version of the flange.

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This carburetor does not have a high speed adjusting screw (H screw). Emissions at idle speed and part-load revs are reduced by using a lean idle mixture. 6WDQGDUG VHWWLQJ / Open turn Carefully screw home low speed screw clockwise until it is against its seat. Then rotate it one turn counterclockwise.

· Mount the cutting tool ,I Q\ORQ OLQH FXWWLQJ KHDG LV ILWWHG Check length of line. (DFK line must extend as far as limiting blade on deflector.

· Check air filter and clean if necessary · Start the engine and warm it up

Set idle speed to 2,800 rpm with idle speed screw (/$). ,I UXQQLQJ SUREOHPV RFFXU DW WKLV VWDQGDUG VHWWLQJ HJ HQJLQH VWDOOV ZKLOH LGOLQJ SRRU DFFHOHUDWLRQ FDUU\ RXW WKH IROORZLQJ DGMXVWPHQWV 3RRU DFFHOHUDWLRQ RU HQJLQH VWDOOV a) Check standard setting (/ ) b) Rotate low speed screw (/) one eight turn counterclockwise c) Set idle speed to 2,800 rpm with idle speed screw (/$) If necessary, repeat adjustments b and c. (QJLQH VWDOOV GXULQJ WUDQVLWLRQ IURP IXOO ORDG WR LGOH VSHHG RU UXQV HUUDWLFDOO\ DW LGOH VSHHG a) Check standard setting (/ ) b) Rotate low speed screw (/) one eighth turn clockwise c) Set idle speed to 2,800 rpm with idle speed screw (/$) If necessary, repeat adjustments b and c.

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&XWWLQJ WRRO URWDWHV DW LGOH VSHHG a) Set idle speed to 2,800 rpm with idle speed screw (/$) b) Turn idle speed screw (/$) counterclockwise until cutting tool stops rotating - then turn it another one half turn in the same direction.

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(QJLQH - under pressure: - under vacuum: &DUEXUHWRU - Inlet needle testing: 7LJKWHQLQJ 7RUTXHV 0.8 bar (11.6 psi) 0.5 bar (7.25 psi) 0.5 bar (7.25 psi)

Tightening torques are listed in the service manual for the STIHL FS 75, 80, 85; FC 75 and HL 75.

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A service manual is available for the STIHL FS 75, 80, 85. This service manual contains no chapters on "Servicing the Carburetor", "Troubleshooting" or standard repairs. These procedures are described in separate manuals. 5HSDLU 7LPHV

1 2 3 4 5 6 7 8 9 10 11 12 13

Crankcase, Short Block Crankcase and/or Bearings Crankcase Gasket, Sealing Crankshaft Seals Cylinder and/or Piston Ignition Fuel Hose, Fuel Supply Replace Gear Box Assy Carburetor Fan Housing, Clutch Housing Front Handle, Throttle Recoil Starter Clutch Drive Tube, Drive Shaft Muffler Air Filter, Filter Cover Stop Switch Fuel Tank Replace Arbor Gears All Other Repairs & Misc. Repairs

2.1 2.2 2.0 0.7 0.8 0.5 0.5 0.5 0.7 0.8 0.6 0.5 0.5 0.5 0.4 0.3 0.4 0.4 0.8 0.5

The specified repair times assume that the work is performed by trained personnel in a properly equipped service workshop. The repair times are given in tenths of an hour (0.1 = 6 minutes). 1RWH The brushcutter repair times on the right can be used to update the STIHL repair times table manual.

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14 15 16 17 18 19 20

A separate parts list is available for the new units.

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1RWH All repairs include diagnostic time.

© 1996 Andreas Stihl

Andreas Stihl D1/MTK-na Technical Documentation

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Information

TI 36.96 US

12 pages

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