Stihl Ms 270 C Owners Manual
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50 English / USAMS 270, MS 270 C, MS 280, MS 280 C : Remove the chain sprocket cover, chain and guide bar. : Disengage the chain brake: Pull hand guard toward the front handle. – Replace the chain sprocket after using two Oilomatic chains. – Replace sooner if the wear marks on the sprocket are deeper than approx. 0.02 in (0,5 mm) since this would reduce the life of the chain. You can use a gauge (“Special Accessories”) to check the depth of the wear marks on sprockets. It is best to use two chains in rotation with one sprocket. Use only original STIHL chain sprockets to ensure correct operation of the chain brake. : Use a screwdriver to remove the E-clip (1). : Take off the washer (2) and rim sprocket (3). : Examine splines on clutch drum (4) – if wear marks are severe, fit a new clutch drum. : Pull clutch drum or spur sprocket (5) and needle cage (6) off the crankshaft. Installing spur sprocket / rim sprocket: Clean the crankshaft stub and needle cage, and lubricate with STlHL grease (“Special Accessories”). : push needle cage on to crankshaft : After fitting clutch drum or spur sprocket, rotate it about one turn to engage oil pump drive. : Fit rim sprocket with cavities facing outward. : Refit washer and E-clip on the crankshaft. Checking and Replacing Chain Sprocket 001BA121 KN 001BA122 KN 1 2 4 5 61 2 3 6
51 MS 270, MS 270 C, MS 280, MS 280 C English / USA Correctly sharpened chainA properly sharpened chain slices through wood effortlessly and requires very little feed pressure. Do not work with a dull or damaged chain as it will increase the physical effort required, cause high vibrations, produce unsatisfactory cutting results and a higher rate of wear. : Clean the chain. : Check the chain for cracks in the links and damaged rivets. : Replace any damaged or worn parts of the chain and match the new parts to the shape and size of the original parts. It is absolutely essential to comply with the angles and dimensions specified below. If the saw chain is incorrectly sharpened – and in particular if the depth gauge is set too low – there is a risk of increased kickback of the chainsaw, with resulting risk of injury . The chain pitch (e.g. 3/8) is marked on the depth gauge end of each cutter. Use only special saw chain sharpening files. Other files have the wrong shape and cut. Select file diameter according to chain pitch – see table “Sharpening Tools”. You must observe certain angles when resharpening the chain cutter. A = Filing angle B = Side plate angle Cutter shapes: Micro = Semi-chisel Super = Full chisel The specified angles A and B are obtained automatically if the recommended files or sharpening tools and correct settings are used. Maintaining and Sharpening Saw Chain 3/8 689BA020 KN Chain type Angle (°) AB Rapid-Micro (RM) 30 85 Rapid-Super (RS) 30 60 Picco-Micro (PM/PMN) 30 85 A B 689BA021 KN
52 English / USAMS 270, MS 270 C, MS 280, MS 280 C Furthermore, the angles must be the same on all cutters. If angles are uneven: Chain will run roughly, not in a straight line, wear quickly and finally break. As these requirements can be met only after sufficient and constant practice: : Use a file holder A file holder (special accessory) must be used for manual resharpening (see table Sharpening Tools). The correct filing angles are marked on the file holder. For checking anglesUse a STlHL filing gauge (special accessory – see table Sharpening Tools). This is a universal tool for checking the filing and side plate angles, depth gauge setting and cutter length. It also cleans the guide bar groove and oil inlet holes.File correctly: Select sharpening tools according to chain pitch. : Clamp the bar in a vise if necessary. : Lock the chain – push hand guard forward. : To rotate the chain, pull the hand guard against the front handle to disengage the chain brake. On models with QuickStop Super, also press down the throttle trigger interlock lever. : Sharpen chain frequently, take away as little metal as possible – two or three strokes of the file are usually enough. : Hold the file horizontally (at right angle to side of guide bar) and file according to the angles marked on the file holder. Rest the file holder on the top plate and depth gauge. 689BA025 KN 90° 60° 85° 70° 80° 0° 35° 10° 30° 689BA022 KN 689BA018 KN 90° 689BA043 KN
53 MS 270, MS 270 C, MS 280, MS 280 C English / USA : Always file from the inside to the outside of the cutter. : The file only sharpens on the forward stroke – lift the file off the cutter on the backstroke. : Avoid touching the tie straps and drive links with the file. : Rotate the file at regular intervals while filing to avoid one-sided wear. : Use a piece of hardwood to remove burrs from cutting edge. : Check angles with the filing gauge. All cutters must be the same length. If the cutters are not the same length, they will have different heights. This makes the chain run roughly and can cause it to break. : Find the shortest cutter and then file all other cutters back to the same length. This can be very time consuming – it is best to have it done in the workshop on an electric grinder. Depth gauge settingThe depth gauge determines the height at which the cutter enters the wood and thus the thickness of the chip removed. Specified distance or setting between depth gauge and cutting edge = a: This setting may be increased by 0.2mm (0.008) for cutting softwood in mild weather season – no frost. Lowering depth gaugesThe depth gauge setting is reduced when the chain is sharpened. : Use a filing gauge to check the setting every time you sharpen the chain. : Place a filing gauge ( 1) that matches the chain pitch on the chain – if the depth gauge projects from the filing gauge, the depth gauge has to be lowered. : File down the depth gauge until it is level with the filing gauge. Chain pitch Depth gauge setting “a“ Inch (mm) mm (inch) 1/4 (6.35) 0.65 (0.026) 3/8 PMN (9.32) 0.45 (0.018) 3/8 PM, PMMC3 (9.32) 0.65 (0.026) 0.325 (8.25) 0.65 (0.026) 3/8 (9.32) 0.65 (0.026) 0.404 (10.26) 0.80 (0.031) 689BA023 KN a 689BA047 KN 1 689BA051 KN
54 English / USAMS 270, MS 270 C, MS 280, MS 280 C : File the top of the depth gauge parallel to the stamped service marking (see arrow) – but do not lower the highest point of the depth gauge in this process. The kickback tendency of the chainsaw is increased if the depth gauges are too low. : Place filing gauge on the chain – highest point of depth gauge must be level with the filing gauge. PM 1, RM2: Rear hump of tie strap (with service marking) is lowered along with the depth gauge. RSC3, RMC3, PMC3, PMMC3: The upper part of the humped drive link (with service marking) is lowered along with the depth gauge. The other parts of the triple-humped tie strap and humped drive link must not be filed since this may increase the kickback tendency of the chainsaw. : After sharpening, clean the chain thoroughly, remove filings or grinding dust – lubricate the chain thoroughly. : Before long out-of-service period, clean the chain and store it in a well-oiled condition. 689BA044 KN 689BA052 KN Sharpening Tools (special accessories) Chain pitch Round file Ø Round file File holder Filing gauge Flat file 1) Sharpening kit 2) inch (mm) mm (inch) Part No. Part No. Part No. Part No. Part No.1/4 (6.35) 4.0 ( 5/32) 5605 772 4006 5605 750 4327 1110 893 4000 0814 252 3356 5605 007 1027 3/8 PMN (9.32) 4.0 ( 5/32) 5605 772 4006 5605 750 4327 0000 893 4000 0814 252 3356 5605 007 1026 3/8 P (9.32) 4.0 ( 5/32) 5605 772 4006 5605 750 4327 1110 893 4000 0814 252 3356 5605 007 1027 0.325 (8.25) 4.8 ( 3/16) 5605 772 4806 5605 750 4328 1110 893 4000 0814 252 3356 5605 007 1028 3/8 (9.32) 5.2 ( 13/64) 5605 772 5206 5605 750 4329 1110 893 4000 0814 252 3356 5605 007 1029 0.404 (10.26) 5.5 ( 7/32) 5605 772 5506 5605 750 4330 1106 893 4000 0814 252 3356 5605 007 1030 1) Use triangular file 0811 421 8971 for PM1 and RM2 2) consisting of file holder with round file, flat file and filing gauge
55 MS 270, MS 270 C, MS 280, MS 280 C English / USA 1) STIHL recommends that this work be done by a STIHL servicing dealer 2) see Chain brake Maintenance ChartPlease note that the following maintenance intervals apply for normal operating conditions only If your daily working time is longer than normal or cutting conditions are difficult (very dusty work area, resin-rich wood, tropical wood etc.), shorten the specified intervals accordingly. If you only use the saw occasionally, extend the intervals accordingly. before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged as required Complete machine Visual inspection (condition, leaks) XX Clean X Throttle trigger, trigger interlock, Master Control Check operation XX Chain brake Check operation XX Have checked by servicing dealer 1)2) X Pickup body/filter in fuel tank Check X Clean, replace filter element XX Replace pickup body XXX Fuel tank Clean X Chain oil tank Clean X Chain lubrication Check X Saw chain Inspect, also check sharpness XX Check chain tension XX Sharpen X Guide bar Check (wear, damage) X Clean and turn over X Deburr X Replace XX Chain sprocket Check X Air filter Clean XX Replace X Antivibration elements Inspect XX Have replaced by servicing dealer 1) X Cooling inlets Clean X Cylinder fins Clean XX
56 English / USAMS 270, MS 270 C, MS 280, MS 280 C1) STIHL recommends that this work be done by a STIHL servicing dealer 2) Firmly tighten cylinder base screws of professional saws (3.4 kW or more) after 10 to 20 hours of operation 3) not in all versions, market-specific Please note that the following maintenance intervals apply for normal operating conditions only. If your daily working time is longer than normal or cutting conditions are difficult (very dusty work area, resin-rich wood, tropical wood etc.), shorten the specified intervals accordingly. If you only use the saw occasionally, extend the intervals accordingly. before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged as required Carburetor Check idle adjustment – chain must not rotate XX Readjust idle X Spark plug Readjust electrode gap X Replace after about 100 operating hours All accessible screws and nuts (not adjusting screws) 2) Retighten X Spark arresting screen 3) in muffler Inspect X Clean or replace X Chain catcher Check X Replace X Safety label Replace X
57
MS 270, MS 270 C, MS 280, MS 280 C English / USA
1Carburetor box cover twist lock
2 Carburetor adjusting screws
3 Spark plug boot
4 Decompression valve*
(automatically resetting)
5 Chain sprocket cover
6 Chain sprocket
7 Chain brake
8 Adjusting wheel of quick
chain tensioner*
9 Side chain tensioner
10 Chain catcher
11 Bumper spike
12 Guide bar
13 Oilomatic saw chain
# Serial number
14 Oil filler cap
15 Muffler
16 Front hand guard
17 Front handle (handlebar)
18 Starter grip
19 Fuel filler cap
20 Master Control lever
21 Throttle trigger
22 Throttle trigger interlock
23 Rear handle
24 Rear hand guard
* see Guide to Using this Manual
Main Parts of the Saw
#
3
9
146BA015 KN
12
56
78
10 11
12
13
4
22
24
19
18
23
14
146BA016 KN
15
16
17
2021
58 English / USAMS 270, MS 270 C, MS 280, MS 280 CDefinitions 1. Carburetor Box Cover Twist LockLock for carburetor box cover. 2. Carburetor Adjusting Screws For fine tuning the carburetor. 3. Spark Plug Boot Connects the spark plug with the ignition wire. 4. Decompression Valve (automatically resetting) Releases compression resistance to make engine starting easier - when activated 5. Chain Sprocket Cover Covers the clutch and the sprocket. 6. Chain Sprocket The toothed wheel that drives the saw chain. 7. Chain Brake A device to stop the rotation of the chain if activated in a kickback situation by the operators hand or by inertia. 8. Adjusting Wheel Quick chain tensioner 9. Chain Tensioner Permits precise adjustment of chain tension. 10. Chain Catcher Helps to reduce the risk of operator contact by a chain if it breaks or comes off the bar. 11. Bumper Spike Toothed stop for holding saw steady against wood. 12. Guide Bar Supports and guides the saw chain. 13. Oilomatic Saw Chain A loop consisting of cutters, tie straps and drive links. 14. Oil Filler Cap For closing the oil tank. 15. Muffler Reduces engine exhaust noise and directs the exhaust gases. 16. Front Hand Guard Provides protection against projecting branches and helps prevent left hand from touching the chain if it slips off the handlebar. It also serves as the lever for chain brake activation. 17. Front Handle Handlebar for the left hand at the front of the saw. 18. Starter Grip The grip of the starter, for starting the engine. 19. Fuel Filler Cap For closing the fuel tank. 20. Master Control Lever Lever for choke control, starting throttle, run and stop switch positions. 21. Throttle Trigger Controls the speed of the engine. 22. Throttle Trigger Interlock Must be depressed before the throttle trigger can be activated. 23. Rear Handle The support handle for the right hand, located at or toward the rear of the saw. 24. Rear Hand Guard Gives added protection to operators right hand. Guide Bar Nose The exposed end of the guide bar. (not illustrated, see chapter Tensioning the Saw Chain) Clutch Couples engine to chain sprocket when engine is accelerated beyond idle speed. (not illustrated) Anti-Vibration System The anti-vibration system includes a number of anti-vibration elements designed to reduce the transmission of vibrations created by the engine and cutting attachment to the operators hands. (not illustrated)
59 MS 270, MS 270 C, MS 280, MS 280 C English / USA EngineSTIHL single cylinder two-stroke engine EPA / CEPA: The Emission Compliance Period referred to on the Emissions Compliance Label indicates the number of operating hours for which the engine has been shown to meet Federal emission requirements. Category: A = 300 hours, B = 125 hours, C = 50 hours CARB: The Emission Compliance Period used on the CARB-Air Index Label indicates the terms: Extended = 300 hours, Intermediate = 125 hours, Moderate = 50 hours Electronic magneto ignition systembreakerless Spark plug (suppressed) Bosch WSR 6 F, NGK BPMR 7 A Electrode gap 0.02 in (0.5 mm) Fuel/Oil SystemDiaphragm carburetor All position with integral fuel pump Fuel tank capacity 1.1 US pt (0.520 l) Fuel mixture See Fuel Chain lubrication Fully automatic, speed-controlled reciprocating oil pump. Additional manual oil flow control. Oil tank capacity 0.6 US pt (0.280 l) Specifications MS 270 MS 270 C MS 280 MS 280 C Displacement 3.0 cu in (50 cm 3)3.0 cu in (50 cm 3)3.3 cu in (54.68 cm 3)3.3 cu in (54.68 cm 3) Bore 1.73 in (44.0 mm)1.73 in (44.0 mm)1.81 in (46.0 mm) 1.81 in (46.0 mm) Stroke 1.30 in (32.9 mm)1.30 in (32.9 mm)1.30 in (32.9 mm) 1.30 in (32.9 mm) Idle speed 2,800 rpm 2,800 rpm 2,800 rpm 2,800 rpm Weight without bar and chain 11.7 lb (5.3 kg) 11.9 lb (5.4 kg) 11.7 lb (5.3 kg) 11.9 lb (5.4 kg)