GGP Mountfield SV-150 Workshop Manual Download Page 5

2.1 GENERAL AND SAFETY REGULATIONS

A) Qualification of operators

All maintenance, disassembly and repairs must be
carried out by expert mechanics who are familiar
with all the accident prevention and safety regula-
tions after reading through the procedures in this
manual.

B) Safety measures

All the engines are built in conformity with the
European safety regulations in force.

To maintain initial safety levels in the long term, the
Service Centre should take proactive measures by
making checks whenever possible.

Every time you are asked to service the engine (or
the lawnmower on which it is installed), you should: 

1) check: 

– that the safety devices function correctly;
– that the guards and covers have not been

removed;

– that the nameplates or specification labels

have not been removed or made illegible,
as they form an integral part of the safety
devices.

2) also:

– make sure the safety devices function cor-

rectly if they have been tampered with or
removed;

– replace ineffective, damaged or missing

guards and covers;

– replace illegible labels;
– do not carry out operations or modifica-

tions on the lawnmower or on the engine
that could affect their performance or lead
to an improper or different use from the
one for which it has been designed and
approved;

– warn the customer that the failure to com-

ply with the above points automatically
voids the warranty and the responsibility of
the manufacturer.

C) Precautions during servicing

The operations described in this manual do not
entail particularly hazardous situations besides the

normal hazard related to mechanical operations
and that can be avoided by taking the necessary
care and attention normally required for this type of
work.

As well as following the usual accident prevention
regulations that apply to most repair shops, we rec-
ommend you: 

– disconnect the spark plug cap before servic-

ing; 

– protect hands with suitable working gloves,

especially when working near the cutting unit; 

– check that you do not cause accidental petrol

leaks or other losses;

– do not smoke when working on the tank or

when handling petrol; 

– do not inhale oil or petrol fumes; 
– clean up all traces of spilt petrol immediately; 
– test the engine in a well-ventilated environ-

ment or where there are adequate exhaust
fume extraction systems;

– do not pollute the environment with oil, petrol

or other waste and dispose of all waste in
accordance with the laws in force.

D) Necessary equipment

All the operations can be carried out with the tools
normally used in a good garage.

Some operations require special equipment and
tools 

[

3.1.F]

.

E) Symbols and terms used for safety purposes

Some paragraphs in this manual are preceded by
symbols which indicate the following:

Operations that should be carried out with
utmost care to avoid impairing the functionality
and safety of the engine and/or lawnmower on
which it is installed.

Operations that should be carried out with
utmost care to avoid injury to operators. 

“WARNING” stresses the risk of injury to oneself
and others if instructions and regulations are not
observed.

01/2005

SV 150

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GENERAL AND SAFETY REGULATIONS 

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WORKSHOP MANUAL 

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Summary of Contents for Mountfield SV-150

Page 1: ...the right to make all the necessary technical or commercial improvements to its products so there may be some differences between the series of lawnmowers and the contents of this manual However the b...

Page 2: ...are parts available 4 Engine tuning This chapter describes how to plan a mainte nance program and outlines a servicing proce dure for general engine tuning 5 Troubleshooting This chapter summarizes al...

Page 3: ...g time All problems related to use are fully covered in the user manual 01 2005 SV 150 ii 0 INTRODUCTION 1 1 WORKSHOP MANUAL page from 2004 to 6 3 INTAKE SYSTEM GENERAL INFORMATION The intake system u...

Page 4: ...laced parts in case clients should make fur ther complaints C Faultnotification The manufacturer should be informed of all faults that recur frequently this allows it to care fully examine the problem...

Page 5: ...al do not entail particularly hazardous situations besides the normal hazard related to mechanical operations and that can be avoided by taking the necessary care and attention normally required for t...

Page 6: ...procedure 6 1 Conveyor nuts 2 4 7 Nm 6 2 Starter screw 6 4 6 Nm 6 3 Governor bracket screw 7 6 8 Nm 6 3 Carburettor screws 8 6 8 Nm 6 5 Cylinder head screws 34 20 25 Nm 6 6 Spark plug tightening torqu...

Page 7: ...it 11 Nut 12 Oil level pipe assembly 13 Air filter base 14 Screw 15 Filtering element 16 Air filter cover 17 Breather pipe 18 Governor bracket 19 Governor spring 20 Spring 21 Carburettor 22 Governor t...

Page 8: ...unctional test point C Should the checks and adjustments fail to achieve a satisfactory result refer to chapter 5 for trou bleshooting C Functional test A functional test needs to be carried out at th...

Page 9: ...nder head screws can loosen causing the gasket to burn The piston rings can wear out due to the pas sage of dust caused by an excessively dirty or unoiled air filter or overheating due to the lack of...

Page 10: ...The engine must start with the lawnmower drive completely disengaged a poorly adjusted cable can generate faulty resistance which makes starting more difficult If the engine is tilted with the spark p...

Page 11: ...he carburettor clog up the petrol supply drops and the engine becomes less efficient The pneumatic governor fin disc is broken or does not move freely and therefore fails to work the carburettor corre...

Page 12: ...The governor rods are bent deformed or do not move freely preventing the governor from reach ing its end of stroke The air gap adjustment between the flywheel and coil must be 0 25 0 40 mm Excess dir...

Page 13: ...e thickness of the clutch lining normally guar antees good braking action for the entire dura tion of the engine If it comes away from the lever act immediately to stop the metal from rubbing against...

Page 14: ...pe 6 1 C SERVICING PROCEDURES WARNING All work on the tank and on the sup ply system must be carried out in safe condi tions so do not smoke always empty the tank work in a ventilated environment away...

Page 15: ...clean inside the tank 15 Empty the tank and dispose of the petrol used for cleaning in accordance with the laws in force 16 Remount the conveyor WARNING Check that the petrol pipe 4 is intact and sec...

Page 16: ...out strain the hooks are deformed or broken 6 2 B inefficient or no return of the cable spring broken 6 2 C In all cases remove the conveyor to make the nec essary checks or repairs SERVICING PROCEDUR...

Page 17: ...r with the tank 6 1 A 22 Loosen the central screw 6 and dismount the bushing 7 and hooks 8 without letting the pul ley 3 slip out of place NOTE The screw 6 has a left handed thread and therefore shoul...

Page 18: ...to the handle 5 with a knot 39 Spray some silicone lubricant onto the spring 9 and apply liquid grease to inside the conveyor housing Check that the spiral spring 10 is securely lodged in the conveyor...

Page 19: ...move the cover 1 by releasing the rear flap 2 and remove the sponge filtering element 3 IMPORTANT The filtering element must be kept clean and soaked in oil Replace it if bro ken cracked or fragmented...

Page 20: ...body 5 loosen the screw 7 fastening the governor system bracket and the two screws 8 remembering that both these screws also fasten the carburettor to the engine block 14 Disconnect the oil vapour cir...

Page 21: ...tank if petrol is not strictly necessary for the operation to be carried out work in a ventilated environment away from naked flames or unprotected sources of heat collect petrol in a suitable contain...

Page 22: ...rneath the screw 5 the float 8 must oscillate freely on the pin 7 the jet 11 should never be modified or replaced with others even if they seem to have the same specifications the choke 12 must open a...

Page 23: ...ine s minimum speed must be between 2200 and 2500 rpm 23 Turn the screw 22 on the carburettor until you achieve a stable minimum speed within the above values D Adjusting maximum speed NOTE This opera...

Page 24: ...ient power if not due to other causes Incorrect adjustment of the throttle cable 6 5 A rods bent or deformed 6 5 B pneumatic device broken or blocked 6 5 B Engine runs irregularly if not due to other...

Page 25: ...t broken and moves freely If the fin disc is even partly broken replace it point D 14 If the above checks do not reveal faults a dif ference between the measured speed and specified speed can be compe...

Page 26: ...e sure the washer 41 is correctly posi tioned underneath the fin disc 37 and securely tighten the pin 39 in such a way that the fin disc 37 moves freely Check that the tie rod 40 has a centre dis tanc...

Page 27: ...r gap 6 6 B oxidized or loose contacts 6 6 B For access to the coil and the flywheel remove the upper conveyor SERVICING PROCEDURES A Checking the efficiency of the ignition sys tem 1 Dismount the spa...

Page 28: ...any cracks or signs of deterioration or burns which reduce its efficiency and insulation level 14 Loosen the two screws 13 securing the coil 12 release the brake manually and rotate the flywheel 14 u...

Page 29: ...are lined up with the poles of the coil core 12 26 Insert a 0 35 mm thickness gauge 15 between the flywheel 14 and the coil poles Push the coil until the poles come in contact with the thickness gauge...

Page 30: ...gine does not stop within 3 seconds after it is turned off clutch lining has come away 6 7 C If the microswitch malfunctions or if the brake lining has come away replace the entire assembly which is m...

Page 31: ...2 mm thick at the thinnest point 23 Make sure that the control lever 14 moves freely and remove any remains of grass and mud 24 Reconnect the petrol pipe and start the engine Release the lawnmower le...

Page 32: ...t 25 and fastened by the stud bolt 23 36 After making all the connections check that the terminal 29 is correctly fixed onto the support 25 and that the wire 21 is correctly attached to the outer hole...

Page 33: ...eyor with the tank 6 1 A 2 Remove the cover 1 secured by three screws 2 3 Unscrew the two nuts 3 and take out the muf fler 4 the heatproof baffle 5 the spacer 6 and the gasket 7 4 When mounting thorou...

Page 34: ...nder head 3 4 Remove the gasket 5 and clean the cylinder head and cylinder surfaces 5 Turn the flywheel manually to move the piston and the valves and clean inside the cylinder removing any deposits f...

Page 35: ...nd the engine brake cable 22 23 Dismount the cutting assembly and undo the 3 screws 23 which are accessible from the bot tom of the lawnmower 24 Hold the engine in points with a firm grip remembering...

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