manualshive.com logo in svg

Stihl MS 780, Instruction Manual, Page: 23 / 44

Share
Download
Stihl MS 780 Instruction Manual Download Page 23

After the saw chain has run in, check the tension

of the chain and correct if necessary – see

"Checking the chain tension".

14 Chain Brake

 

14.1

Saw chain, lock

143BA011 KN

–

in an emergency

–

when starting

–

when idling

Press the hand guard towards the nose of the

guide bar with the left hand - or automatically

due to kickback: Saw chain is blocked - and

stops running.

14.2

Disengage the chain brake.

143BA012 KN

► Pull the hand guard back towards the front

handle.

NOTICE

The chain brake must be released before open‐

ing the throttle (except during functional check‐

out) and before sawing.
Running the engine at high revs with the chain

brake engaged (chain locked) will quickly dam‐

age the engine and chain drive (clutch, chain

brake).

The chain brake is also activated by the inertia of

the front hand guard if the kickback force of the

saw is high enough: The hand guard is acceler‐

ated toward the bar nose – even if your left hand

is not behind the hand guard, e.g. during felling

cut.
The chain brake will operate only if the hand

guard has not been modified in any way.

14.3

Checking Operation of the

Chain Brake

Before starting work: Run engine at idle speed,

engage the chain brake (push hand guard

towards bar nose) and open the throttle wide for

(no more than 3 seconds) – the chain must not

rotate. The hand guard must be free of dirt and

easily moveable.

14.4

Chain Brake Maintenance

The chain brake is subject to (normal wear). It is

necessary to have it serviced and maintained

regularly by trained personnel. STIHL recom‐

mends that maintenance and repair work be car‐

ried out only by authorised STIHL dealers. The

following intervals must be complied with:
Full-time use:

quarterly

Part-time use:

every six months

occasional use:

annually

15 Winter Operation

 

15.1

At temperatures below 10 °C:

1

171BA022 KN

2

15.1.1

Pre-heat carburetor

► Remove the carburetor box cover

► in the carburetor box cover, move the slide

from summer position (1) to winter position (2)

Heated air is now drawn in from around the cylin‐

der and mixed with cold air – this helps prevent

carburetor icing.

14 Chain Brake

English

0458-550-0121-B

23

Summary of Contents for MS 780

Page 1: ...MS 780 Instruction Manual 2 41...

Page 2: ...uct It has been built using modern production techni ques and comprehensive quality assurance Every effort has been made to ensure your satis faction and trouble free use of the product Please contact...

Page 3: ...yone using it understands the information contained in this manual To operate a chain saw you must be rested in good physical condition and mental health If you have any condition that might be aggrav...

Page 4: ...If you have any questions in this respect consult a servicing dealer Use only high quality tools and accessories Otherwise there may be a risk of accidents and damage to the machine STIHL recommends...

Page 5: ...start the engine start as described in the Instruction Manual 2 10 During operation Ensure you always have a firm and safe footing Take special care when the bark is wet danger of slipping 001BA087 L...

Page 6: ...arts These gases may be colour less and odourless and may contain unburnt hydrocarbons and benzene Never work with the machine indoors or in poorly ventilated areas even if your machine is equipped wi...

Page 7: ...ring Never touch a hot muffler risk of burns The condition of the anti vibration elements influ ences vibration behaviour inspect anti vibration elements periodically Inspect chain catcher replace if...

Page 8: ...a foreign object in the wood The reaction of the chain pulls the saw forward to reduce this risk always engage the spiked bumper securely in the tree or limb 3 6 Pushback B 001BA038 KN B Pushback occu...

Page 9: ...s Also dried out plants and brushwood are combustible above all in hot and dry weather If there is a risk of fire do not use the chain saw in the vicinity of easily combustible materials dry plants or...

Page 10: ...e sure no one is endangered by the falling tree the noise of your engine may drown any warning calls 001BA088 L 2 1 2 1 1 1 2 Maintain a distance of at least 2 1 2 tree lengths from the next felling s...

Page 11: ...direction of fall Important Make a felling notch at right angle to direction of fall Saw as close to the ground as possible Cut to a depth of approx 1 5 to 1 3 of the diameter of the trunk Determine...

Page 12: ...0 to 1 5 of the trunk diameter Do not cut into the strip during the felling cut With rotten trunks leave a wider strip Plunge cutting For relieving cuts during shortening For wood carving 001BA269 KN...

Page 13: ...g before starting the felling cut Plunge cut the felling cut E plunge the guide bar fully in Engage the spiked bumper behind the hinge and use this as the rotation point reposition the chainsaw as lit...

Page 14: ...the felling cut towards the holding strap 2 Cut horizontally Do not cut into the holding strap 001BA266 KN Shout a second warning immediately before the tree falls With outstretched arms cut through t...

Page 15: ...ge 2 of the saw chain 1 must match the groove width of the guide bar 3 If non matching components are used the cut ting attachment may be damaged beyond repair after a short period of operation 5 1 Ch...

Page 16: ...to protect your hands from the sharp cutters Fit the chain start at the bar nose 3 1 1 2 4 001BA187 KN Fit the guide bar over the studs 1 the cut ting edges on the top of the bar must point to the rig...

Page 17: ...e engine oil for optimum engine life MotoMix is not available in all markets 9 2 Mixing fuel NOTICE Unsuitable fuels or a mixing ratio that deviates from the specification can lead to severe engine da...

Page 18: ...e cleaned thoroughly from time to time Residual fuel and the liquid used for cleaning must be disposed of in accordance with regula tions and without harming the environment 10 Fueling 10 1 Preparing...

Page 19: ...be aligned with each other Push the filler cap down as far as it will go 001BA221 KN Hold the filler cap down and turn it clockwise until it engages 001BA222 KN Fold down the bracket as far as it will...

Page 20: ...Turn the filler cap clockwise and close it see the section Closing and Checking the lock 10 4 Filler cap with marking 10 4 1 To open 001BA236 KN Open bracket 001BA232 KN Turn filler cap approx 1 4 tu...

Page 21: ...he base of the filler cap is twisted in relation to the upper part Remove the filler cap from the fuel tank and look at it from above 1 001BA238 KN left Base of filler cap is twisted interior marking...

Page 22: ...and the area around it to ensure that no dirt falls into the tank Position the machine so that the filler cap is facing up Open the filler cap 12 2 Fill up with chain oil Refill the chain oil tank ev...

Page 23: ...g during felling cut The chain brake will operate only if the hand guard has not been modified in any way 14 3 Checking Operation of the Chain Brake Before starting work Run engine at idle speed enga...

Page 24: ...ne using a suitable tool This causes only warm air from the vicinity of the cylinder to be taken in prevents icing of air filter and carburetor if the chain saw is extremely cold frost forma tion afte...

Page 25: ...ttle trigger at the same time 16 2 1 Choke shutter closed l if the engine is cold if the engine stalls when you open the throttle after starting if the fuel tank was run until empty engine stopped 16...

Page 26: ...o not let the starter grip snap back Guide it slowly back into the housing so that the starter rope can rewind properly Machines without additional manual fuel pump If the engine is new or after a lon...

Page 27: ...throttle trigger 2 the Master Control lever 1 moves to the run position F and the engine settles down to idling speed 001BA186 KN Pull the hand guard back towards the front handle The chain brake is...

Page 28: ...ect when the chain fits snugly against the underside of the bar but can still be pulled along the bar by hand Retension if neces sary see Tensioning the Saw Chain 17 2 3 Chain at operating temperature...

Page 29: ...3 8 P 5 0 mm Rapid 3 8 0 325 6 0 mm Rapid 0 404 7 0 mm If groove depth is less than specified Replace the guide bar The drive link tangs will otherwise scrape along the bottom of the groove the cutte...

Page 30: ...specific in the muffler and clean or replace if necessary L H 171BA019 KN L H 1 2 1 4 Turn high speed screw H counterclockwise as far as stop no more than 1 2 turn Turn the low speed screw L clockwise...

Page 31: ...or runs poorly at idle speed first check the spark plug Fit a new spark plug after about 100 operating hours or sooner if the electrodes are badly eroded Install only suppressed spark plugs of the ty...

Page 32: ...he cylinder fins and air filter When using biological chain oil e g STIHL BioPlus fill the lubricant oil tank Store the machine in a dry and secure location Keep out of the reach of children and other...

Page 33: ...saw chain for cracks and damaged rivets Replace damaged or worn chain components and adapt these parts to the remaining parts in terms of shape and level of wear rework accordingly Carbide tipped Dur...

Page 34: ...th gauge setting and tooth length as well as clean ing grooves and oil inlet holes 27 6 Proper sharpening Select sharpening tools in accordance with chain pitch Clamp guide bar if necessary Block saw...

Page 35: ...ing the depth gauges The depth gauge setting is lowered when the cutter is sharpened Check the depth gauge setting after each sharpening 2 689BA061 KN 1 Lay the appropriate file gauge 1 for the chain...

Page 36: ...s mm mm Inches Part number Part number Part number Part number Part number 1 4P 6 35 3 2 1 8 5605 771 3206 5605 750 4300 0000 893 4005 0814 252 3356 5605 007 1000 1 4 6 35 4 0 5 32 5605 772 40065605 7...

Page 37: ...ent on equipment Function test X X Chain brake Function test X X Have checked by dealer1 X Manual fuel pump if present check X Have repaired by a specialist dealer1 X Fuel pick up body filter in fuel...

Page 38: ...s responsible for all damage caused by non observance of the safety precautions oper ating and maintenance instructions in this man ual This includes in particular Alterations or modifications to the...

Page 39: ...13 14 15 17 18 19 20 21 22 23 216BA001 KN 3 1 Carburetor box cover lock 2 Spark plug boot 3 Carburetor adjusting screws 4 Chain sprocket cover 5 Chain sprocket 6 Chain brake 7 Chain catcher 8 Chain t...

Page 40: ...approval expires if the engine is modified in any way 32 Ordering Spare Parts Please enter your saw model serial number as well as the part numbers of the guide bar and saw chain in the spaces provide...

Page 41: ...n the gar bage can Take the product accessories and packaging to an approved disposal site for envi ronment friendly recycling Contact your STIHL servicing dealer for the lat est information on waste...

Page 42: ...English 34 Disposal 42 0458 550 0121 B...

Page 43: ...34 Disposal English 0458 550 0121 B 43...

Page 44: ...www stihl com 04585500121B 04585500121B 0458 550 0121 B 0458 550 0121 B...

Reviews:

No comments