Stihl MS 251 C-Q Instruction Manual
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Stihl MS 251 C-Q Instruction Manual

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STIHL MS 251 C-Q
Instruction Manual

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Summary of Contents for Stihl MS 251 C-Q

  • Page 1 STIHL MS 251 C-Q Instruction Manual...

  • Page 3: Table Of Contents

    Spark Arresting Screen in Muffler Spark Plug Storing the Machine Checking and Replacing the Chain Sprocket This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process with electronic systems. MS 251 C-Q...

  • Page 4: Quickstop Super Chain Brake System

    QuickStop Super Chain Guide to Using this Manual Brake System This Instruction Manual refers to a This STIHL chain saw is equipped with a STIHL chain saw, also called a machine chain brake system that can be in this Instruction Manual.

  • Page 5: Safety Precautions

    English Engineering improvements Intake air baffle: winter Safety Precautions operation STIHL's philosophy is to continually Special safety precau- improve all of its products. For this Intake air baffle: summer tions must be observed to reason we may modify the design,...
  • Page 6 To operate a chain saw you must be Clothing must be sturdy rested, in good physical condition and STIHL offers a comprehensive range of but allow complete free- mental health. If you have any condition personal protective clothing and dom of movement.
  • Page 7 Place the cliplock filler technically equivalent components that released. cap (bayonet-type) in have been approved by STIHL for this position, turn as far as Master Control lever must move – machine. If you have any questions in stop and fold the cliplock easily to STOP, 0 or †...
  • Page 8 Check the fuel system for leaks and immediately by moving the Master make sure the safety devices are Control lever / stop switch to STOP, 0 or working properly. Never continue using †. MS 251 C-Q...
  • Page 9 Store the machine in a safe, dry room. Exception: adjustment of carburettor Have the machine repaired by a STIHL and idle speed. servicing dealer if the saw chain still Vibrations continues to move during idling.

  • Page 10: Reactive Forces

    Store in a dry, cool and secure place protected against light and sunlight. In the event of a chain brake malfunction, switch off the machine immediately – risk of injury! Consult a MS 251 C-Q...
  • Page 11 Be aware of the location of the guide – deal with them in open areas. the wood, the chain saw may suddenly bar nose Do not cut with the guide bar nose – MS 251 C-Q...

  • Page 12: Working Techniques

    Dry plants and scrub are also easily combustible, especially in hot and dry weather conditions. If there is a risk of fire, do not use your chainsaw near combustible MS 251 C-Q...
  • Page 13 Never work without the spiked bumper because the saw may pull you forwards and off balance. Always engage the spiked bumper securely in the tree or limb. MS 251 C-Q...
  • Page 14 – the noise of your engine On steep slopes, plan escape may drown any warning calls. – routes parallel to the slope. When walking away along the – escape path, watch out for falling limbs and watch the top of the tree. MS 251 C-Q...
  • Page 15 45°- 60° to the horizontal cut. Make felling notch at a right angle to – the planned direction of fall. Cut close to the ground. – Cut to a depth of about 1/5 to 1/3 of – the trunk diameter. MS 251 C-Q...
  • Page 16 Make cuts at both sides of Use a low kickback chain and Leave a broader hinge on rotten exercise particular caution the trunk at same height as bottom of – trees. MS 251 C-Q...
  • Page 17 English 1. Begin cut by applying the lower Contact your STIHL dealer for advice on portion of the guide bar nose – do selecting the right felling wedge (length, not use upper portion because of – width and height). risk of kickback. Start cutting at full...
  • Page 18 (3). Do not cut into the stabilizing strap. – Continue the felling cut on the other side of the trunk. Make sure the second cut is at the same height as the first cut. MS 251 C-Q...
  • Page 19 (2). Cut horizontally. – Do not cut into the hinge. – Do not cut into the holding strap. – Enlarge felling cut as far as holding strap (3). Do not cut into the holding strap. – MS 251 C-Q...

  • Page 20: Cutting Attachment

    (1) must match the groove width of the guide bar (3). If non-matching components are used, the cutting attachment may be damaged beyond repair after a short period of operation. Shout a second warning immediately before the tree falls. MS 251 C-Q...

  • Page 21: Mounting The Bar And Chain (Quick Chain Tensioner)

    (3) marked on the side of the chain guide bar (3) relative to one another scabbard. Remove chain sprocket cover (3) Mounting the tensioning gear Insert and tighten screw (2) Remove and reverse tensioning gear (1) MS 251 C-Q...
  • Page 22 WARNING When fitting the chain sprocket cover, the teeth of the adjusting wheel and the Put on protective gloves – risk of injury tensioning gear must mesh; if by the sharp cutters. necessary, MS 251 C-Q...

  • Page 23: Tensioning The Saw Chain (Quick Chain Tensioner)

    Check chain tension frequently – Check chain tension frequently – see "Operating Instructions" see chapter on "Operating Instructions". MS 251 C-Q...

  • Page 24: Fuel

    Use only high-quality two-stroke engine STIHL MotoMix uses STIHL HP Ultra location protected from light and the sun. oil – preferably STIHL HP, HP Super or two-stroke engine oil for an extra long Fuel mix ages – only mix sufficient fuel HP Ultra, which are specially formulated engine life.

  • Page 25: Fueling

    Tank caps and fuel tanks may be position. marked in different ways Depending on the version, your machine may be equipped with a tank cap and fuel tank with or without symbols. Rotate the tank cap about a quarter turn counterclockwise. MS 251 C-Q...
  • Page 26 Take care not to spill fuel while fueling and do not overfill the tank. Bottom of cap is twisted in relation to top: STIHL recommends you use the STIHL filler nozzle for fuel (special accessory). Fill up with fuel. Closing Fold the grip flush with the top of the cap.
  • Page 27 Take care not to spill fuel while fueling and do not overfill the tank. The marks on the tank cap and fuel tank STIHL recommends you use the STIHL are then in alignment. filler nozzle for fuel (special accessory). Fill up with fuel.

  • Page 28: Chain Lubricant

    Biological chain oil must be resistant to Right: Bottom of cap in correct posi- aging (e.g. STIHL BioPlus), since it will tion – inner mark is under the otherwise quickly turn to resin. This grip. It is not in line with the results in hard deposits that are difficult outer mark.

  • Page 29: Filling Chain Oil Tank

    Take care not to spill chain oil while work. refilling and do not overfill the tank. Every new chain has to be broken in for STIHL recommends you use the STIHL about 2 to 3 minutes. filler nozzle for chain oil (special accessory).

  • Page 30: Chain Brake

    Disengaging the coasting brake Disengaging the chain brake Chain Brake The chain brake system has two functions: Standard STIHL chain brake STIHL coasting brake Press down the throttle trigger Pull the hand guard back toward the The coasting brake stops chain rotation interlock lever.

  • Page 31: Winter Operation

    Air filter system personnel. STIHL recommends that you have servicing and repair work carried Retrofit new air filter if necessary – out exclusively by an authorized STIHL see "Air filter system" servicing dealer. Maintain the following servicing intervals: Place the shutter with the opening in...

  • Page 32: Starting / Stopping The Engine

    – been running for about one minute. When the engine begins to fire – after clearing a flooded combustion – chamber. MS 251 C-Q...
  • Page 33 Machines without additional manual fuel pump: If the engine is new or after a long out-of-service period, it may be necessary to pull the starter rope several times to prime the fuel system. MS 251 C-Q...
  • Page 34 – Guide it slowly back into the housing been running for about one minute. so that the starter rope can rewind properly. Hold and start your saw as described. MS 251 C-Q...
  • Page 35 If you did not move the Master Control immediately – or the engine housing and lever from the choke closed chain brake might otherwise be position (l) to the starting throttle damaged. MS 251 C-Q...

  • Page 36: Operating Instructions

    Slacken off the chain if you have retensioned it at operating Check chain tension frequently temperature during work. A new saw chain must be retensioned more frequently than one that has been in use already for an extended period. MS 251 C-Q...

  • Page 37: Taking Care Of The Guide Bar

    Measure groove depth – using the measuring tool on the file gauge (special accessory) – in the area with the greatest wear Chain type Chain pitch Minimum groove depth Picco 1/4“ P 4.0 mm Rapid 1/4“ 4.0 mm MS 251 C-Q...

  • Page 38: Air Filter System

    English Thorough filter cleaning Air Filter System Cleaning the Air Filter Wash the filter in STIHL special- purpose cleaner (special The air filter system can be adapted to accessory) or a clean, non- If there is a noticeable loss of engine suit different operating conditions by flammable cleaning liquid (e.

  • Page 39: Adjusting The Carburetor

    – then back off 1/4 turn Carefully turn the low speed adjusting screw (L) Setting the idle speed counterclockwise until the engine runs smoothly and accelerates Make standard setting properly. Start engine and let it warm up MS 251 C-Q...

  • Page 40: Spark Arresting Screen In Muffler

    Let the muffler cool down operating hours – or sooner if the electrodes are badly eroded. Install only suppressed spark plugs of the type approved by STIHL – see "Specifications". Clean dirty spark plug. Check electrode gap (A) and Removing the spark plug readjust if necessary –...

  • Page 41: Storing The Machine

    Using two saw chains in alternation helps preserve the chain sprocket. STIHL recommends use of original STIHL chain sprockets in order to ensure optimal functioning of the chain brake. MS 251 C-Q...

  • Page 42: Maintaining And Sharpening The Saw Chain

    – can lead to increased kickback tendency of the chain saw – risk of injury! Clean crankshaft stub and needle cage and lubricate with STIHL lubricant (special accessory) Slide needle cage onto the crankshaft stub MS 251 C-Q...
  • Page 43 The chain pitch marking (a) is embossed Sharpening angle Use a file holder in the area of the depth gauge of each STIHL saw chains are sharpened with a Always use a file holder (special cutter. 30° sharpening angle. Ripping chains, accessory, see table "Sharpening tools")
  • Page 44 The depth gauge determines the depth guide bar) in accordance with the to which the cutter penetrates the wood specified angle – according to the and thus the chip thickness. MS 251 C-Q...
  • Page 45 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 consisting of file holder with round file, taper square file and file gauge MS 251 C-Q...

  • Page 46: Maintenance And Care

    Clean Lubricating oil tank Clean Chain lubrication Check Check, pay attention to sharpness Saw chain Check chain tension Sharpen Check (wear, damage) Clean and turn over Guide bar Deburr Replace Chain sprocket Check Clean Air filter Replace MS 251 C-Q...
  • Page 47 Safety information label Replace STIHL recommends STIHL servicing dealers During initial use of professional chain saws (with a power output of 3.4 kW or more), tighten the cylinder block screws after 10 to 20 hours of operation MS 251 C-Q...

  • Page 48: Main Parts

    17 Front handle (handlebar) 18 Spark plug boot 19 Starter grip 20 Fuel filler cap 21 Master Control lever 22 Throttle trigger 23 Coasting brake lever (throttle trigger lockout) 24 Rear handle 25 Rear hand guard Serial number MS 251 C-Q...

  • Page 49: Specifications

    44 mm .325" Rollomatic E guide bars maximum chain velocity in accordance Stroke: 30 mm with ISO 11681. Contact your STIHL Cutting lengths: 35, 40, 45 cm Engine power to 2.2 kW (3.0 bhp) servicing dealer for advice on personal Pitch: .325"...

  • Page 50: Ordering Spare Parts

    When repairing the machine, only use replacement parts which have been Serial number approved by STIHL for this power tool or are technically identical. Only use high- quality replacement parts in order to Guide bar part number avoid the risk of accidents and damage to the machine.

  • Page 51: Disposal

    Model: MS 251 C-BEQ Serial identification: 1143 Done at Waiblingen, 28.10.2016 STIHL products must not be thrown in Displacement 45.6 cc ANDREAS STIHL AG & Co. KG the garbage can. Take the product, accessories and packaging to an conforms to the relevant provisions of p p.
  • Page 52 0458-740-8321-B www.stihl.com *04587408321B* 0458-740-8321-B...

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