Stiga TRE586V Instruction manual

Rel. 0.0
WORKSHOP MANUAL
PRODUCTION YEAR
TRE 586V - TRE586VA
TRE635V
TRE 586V - TRE586VA
TRE635V
2020 -->
The manufacturer reserves the right to make all the necessary technical or commercial improvements to
its products, so there may be some differences between the series of engines and the contents of this
manual. However the basic specifications and different operating procedures will remain the same.
by STIGA - No use of the illustrations or duplication, reproduction or translation, even partial, of the texts
in this document may be made without explicit authorization.
IMPORTANT NOTICE : The information contained herein is intended for Service Operations and professionals
only, able to competently perform the operations described herein, using the appropriate equipment in
order to safeguard se-curity and performance of the machine. The manufacturer is not liable for damages
or injuries arising from operations performed by individuals or inadequate facilities.
WORKSHOP MANUAL

Release 00 - 12/2019
Engine TRE 586V-TRE 586VA-TRE 635V
pag. 3
Service manual
INTRODUCTION..................................................................................................... 5
1. RULES AND PROCEDURES FOR SERVICE CENTRES .......................................... 6
1.1. Guarantee validity...................................................................................................................................6
1.2. Service repairs after guarantee period..................................................................................................6
1.3. Faultnotication.......................................................................................................................................6
1.4. Spare parts request..................................................................................................................................6
2. GENERAL AND SAFETY REGULATIONS............................................................. 7
2.1. Qualicationofoperators .......................................................................................................................7
2.2. Safety measures.......................................................................................................................................7
2.3. Precautions during servicing...................................................................................................................7
2.4. Warning labels..........................................................................................................................................8
2.5. Necessary equipment.............................................................................................................................8
2.6. Symbols and terms used for safety purposes........................................................................................8
3. TECHNICAL DATA AND SPECIFICATIONS........................................................ 9
3.1. Identication.............................................................................................................................................9
3.2. Technical data .........................................................................................................................................9
3.3. Adjustments..............................................................................................................................................9
3.4. Expendable materials..............................................................................................................................9
3.5. Use limits....................................................................................................................................................9
3.6. Tightening torques..................................................................................................................................10
3.7. Table of Tightening torques...................................................................................................................11
3.8. Identicationofengineunits.................................................................................................................12
4. ENGINE TUNING AND TESTING ...................................................................... 13
4.1. Operating guidelines.............................................................................................................................13
4.2. Changing the engine oil........................................................................................................................14
4.3. Changeoillter ......................................................................................................................................15
4.4. Engine tuning program..........................................................................................................................16
4.5. Functional test ........................................................................................................................................16
5. PETROL SUPPLY AND AIR INTAKE................................................................... 17
5.1. Maintenanceoflteringelement .........................................................................................................18
6. STARTING SYSTEM........................................................................................... 20
6.1. Replacement of brushes .......................................................................................................................20
6.2. Replacement of starting motor.............................................................................................................22
7. CARBURATION................................................................................................ 23
7.1. Removing and cleaning the carburettor.............................................................................................23
7.2. Replacing the carburettor.....................................................................................................................27
7.3. Adjusting minimum speed ....................................................................................................................27
7.4. Adjusting maximum speed...................................................................................................................28
7.5. Adjusting the carburation......................................................................................................................28
CONTENTS
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Service manual
8. GOVERNOR SYSTEM OF THE CARBURETTOR ................................................. 29
8.1. Adjusting of accelerator cable ............................................................................................................29
8.2. Verify petrol pump (if present)..............................................................................................................30
8.3. Pump replacement (if present).............................................................................................................30
8.4. Adjusting maximum speed...................................................................................................................31
9. IGNITION......................................................................................................... 33
9.1. Checkingtheefciencyoftheignitionsystem ..................................................................................33
9.2. Adjusting the air gap and checking the coil......................................................................................34
9.3. Replacing the coil..................................................................................................................................36
10. ENGINE BLOCK - External repairs............................................................... 37
10.1. Checking the compression...................................................................................................................37
10.2. Adjusting the valve clearance .............................................................................................................38
10.3. Dismantling and cleaning the cylinder head .....................................................................................39
10.4. Overhauling the cylinder head and valves ........................................................................................41
10.5.Dismantlingandreplacingthemagnetoywheel .............................................................................44
10.6. Checking the oil breather.....................................................................................................................46
10.7.Replacingtheuppercompressionringoftheengineshaft(ywheelside) ....................................46
10.8. Verify alternator charge........................................................................................................................47
10.9.Replacingthelowercompressionringoftheengineshaft(sumpside)..........................................48
11. ENGINE BLOCK - Overhauling internal parts............................................. 49
11.1. Remove the engine from the machine................................................................................................49
11.2. Carter opening.......................................................................................................................................49
11.3.Dismantlingandcheckingthecamshaftandcounterweightgovernor..........................................51
11.4. Dismantling and checking the piston, piston rings, connecting rod and engine shaft..................54
12. TURNING OFF AND STOPPING ENGINE....................................................... 61
13. EXHAUST SYSTEM.......................................................................................... 61
14. TROUBLESHOOTING...................................................................................... 62
15. CHARGING SYSTEM ..................................................................................... 64
15.1 Electrical diagram..................................................................................................................................64
15.2 Control of the charging system ............................................................................................................65
15.3 Recharge system diagram....................................................................................................................66
CONTENTS
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Engine TRE 586V-TRE 586VA-TRE 635V
pag. 5
Service manual
The purpose of this manual is to provide to Service
Centres the information necessary for a correct
maintenance, dismantling and repair procedure
for engines TRE 586V - TRE 586VA - TRE 635V.
Interventions on the engine must be performed
in accordance with instructions in the following
pages and with safety regulations in force in the
country in which the engine is operated, and only
byauthorisedandappropriately trained personnel.
In every manual page the following informations
are described:
pag. 18 Release 00 - 12/2019
Engine TRE 586V-TRE 586VA-TRE 635V
Service manual
General information
The
located betweenthe carburettorand thecylinder head, whichcarries theair/petrol mixtowards theintake
valve.
See the relevant section [ 14] or advice on resolving problems due to the malfunctioning of the air
intake system.
cylinder.
components.
5. PETROL SUPPLY AND AIR INTAKE
2
1
3
3
4
5.1.
WARNING: Never run the engine without
air filter. The engine would certainly be
damaged.
1).
2 - Open the cover (1) by turning the knob (2) anti-
clockwise (open padlock symbol).
3) and remove the
4) from the cartridge.
A: Motor type for which the page is valid;
B: Reference to the chapter and the argument
with the relative numbering;
C: Presence of previous or following chapters from
the present chapter;
D: Issue date or possible audit;
E: Audit number;
F: Page progressive numbering.
INTRODUCTION
A
B
CC
DE
F
Certainsymbolsareusedinthe manual, highlighting
particularly important information, risks, warnings
and prescriptions:
Warns of operations that should be carried
out with utmost care to avoid impairing the
functionality and safety of the lawnmower.
Warns of operations that should be carried
out with utmost care to avoid impairing the
functionality and safety of the lawnmower.
NOTE: Refers to specific advice by the
manufacturer.
Reference to another procedure or part of
the manual.
Recommends that washers and O-rings are
checked and replaced if necessary.
Refers to use of special tools.
Shows all the operations requiring different
intervention methods depending on the
engine version.
NOTE: During the description of procedures,
the indications “right”, “left”, “front”, “rear”,
“upper” and “lower” refer to the engine
mounted on the machine seen from the
user’s perspective.
Integrated abbreviations:
“RON”: Ride On
“FM”: Front Mover
Please read all the contents of this manual to
become familiar with the basics of the engine,
which is fundamental for operating in a logical
manner without making errors or wasting time.
INDEX
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pag. 6
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Engine TRE 586V-TRE 586VA-TRE 635V
Service manual
1.1. Guarantee validity
Thewarrantyissuppliedundertheterms,procedures
and limits stated in the contract.
1.2. Service repairs after guarantee period
The Service Centre must write a report for each
intervention containing the serial number of the
engine[ 3.1], summary information about the
problems complained of, the intervention made
and possible spare parts used.
A copy of these reports must be kept and made
available to the manufacturer together with the
replaced parts, in case clients should make further
complaints.
1.3. Faultnotication
The manufacturer should be informed of all faults
that recur frequently; this allows it to carefully
examine the problem and make corrections on
the production line.
Similarly, the manufacturer shall report any
faults traced on its engines, indicating the best
troubleshooting procedure.
1.4. Spare parts request
When asking for spare parts, you must quote
their code by referring to the exploded views
correspondingtotheyearofmanufacturereported
on the nameplate [ 3.1].
Useonly original spareparts;the useofnon-original
spare parts may compromise the efciency and
durability of the engine.
Gaskets, washers, O-rings and oil seals must be
checked and, if necessary, replaced during every
inspection and/or maintenance operation.
1. RULES AND PROCEDURES FOR SERVICE CENTRES
INDEX
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pag. 7
Service manual
2. GENERAL AND SAFETY REGULATIONS
IMPORTANT: Before commencing with any
intervention, carefully read the information
provided in the present manual, in particular
the following safety regulations.
2.1. Qualicationofoperators
All maintenance, disassembly and repairs must
be carried out by expert mechanics who are
familiarwith all theaccidentprevention and safety
regulations after reading through the procedures
in this manual.
2.2. 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 machine on which it is installed), you should:
• check:
- that the safety devices function correctly;
- that the casings and protection covers have not
been removed;
- thatthenameplatesorspecicationlabelshave
not been removed or made illegible, (as they
form an integral part of the safety devices).
• Also:
- restore to proper working order any safety
devices which have been manipulated or
removed;
- replace ineffective, damaged or missing guards
and covers;
- replace illegible labels;
- donotcarryoutoperationsormodicationson
the machine 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 comply
with the above points automatically voids
the warranty and the responsibility of the
manufacturer.
2.3. Precautions during servicing
As well as following the usual accident prevention
regulations that apply to most repair shops, we
recommend you:
- the site used for disassembly and assembly must
be clean;
- checking and maintenance operations must
becarriedoutwiththeengineswitchedoffand
cold; high temperature operation of the engine
may cause injury and/or burns;
- clean the engine, removing dirt/dust, metal
debris, carbon deposits, grease stains and other
impuritieswithcleaningagentsandcompressed
air;
- prepare suitabletools and devicesfor disassembly
and assembly;
- when dismantling, highlight the most difcult
parts with reference mark, this helps when
reassembling the most complex parts;
- carry out assembly in the opposite order to
disassembly, i.e. assemble in order from the
inside to the outside and from the main part to
the auxiliary part and its components, until the
wholeengineisassembled;
- disconnect the spark plug cap before servicing;
- 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;
- testtheengineinawell-ventilatedenvironment
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;
INDEX
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pag. 8
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Engine TRE 586V-TRE 586VA-TRE 635V
Service manual
2. GENERAL AND SAFETY REGULATIONS
Exhaustgascontainscarbonmonoxide,which
is highly toxic, odourless and colourless.
Avoid inhaling.
- Performtestsontheengineinawell-ventilated
environment or in the presence of adequate
exhaust gas extraction systems.
- Once the engine has been assembled, perform
a test for correct operation and any adjustments
beforettingitbackontothemachine.
2.4. Warning labels
On the cowl motor, in a immediately identication
position, are some indication or prescription plates
for the safety of the operator.
The plates are as follows:
MM/YYYY
TRE586VA XXXXX
1 - Fire hazard due to:
- Petrol or oil
Prevent by following the precautions below:
- Do not smoke or ignite a ame in the vicinity of
the petrol or oil;
- Turn engine off before adding petrol;
- Do not spill petrol on overheated or electric parts
of the engine;
-Handleorstorepetroloroilinwell-ventilatedareas;
- Use non-ammable oil for cleaning engine parts.
-Accumulationofammablematerial
Prevent by following the precautions below:
-Removedryleaves,chips, pieces of paper,dustor
other ammable material which has accumulated
in or is attached to the engine.
- Electrical cabling
Short circuits can cause res. Prevent by following
the precautions below:
- Always keep the electrical connections of the
machine clean and tightly sealed;
- Tighten any loose connectors or cabling clamps.
Replace those that are damaged.
2-Observetheinstructionsand warningscontained
in the present manual and on the safety plates on
the engine.
Inappropriate functioning and maintenance can
result in serious injury or even death.
3 - Ventilation of closed areas:
In the event that it is necessary to start the engine
in a closed environment or if petrol or cleaning oil
is being used, open doors and windows to ensure
adequate ventilation and, therefore, avoid gas
poisoning.
4 - Motor label (see [ 3.1]).
2.5. Necessary equipment
All the operations can be carried out with the tools
normally used in a good garage.
The symbol used for certain interventions
indicates that special tools or equipment are
recommended.
2.6. 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 machine 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.
1 2 3
4
INDEX
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pag. 9
Service manual
3.1. Identication
Every motor is marked with a serial number on the
base and applied on the cowl; this serial number
can identify:
MM/YYYY
TREXXXX XXXXX
NOTE - The monthly progress reading is reset
to zero every month.
The serial number must be reported on every
operating sheet in the warranty application and
is fundamental for identifying and ordering spare
parts.
3.2. Technical data
TRE 586VA TRE 586V TRE 635V
Displacement 586 cc 586 cc 635 cc
Bore 73 mm 73 mm 76 mm
Stroke 70 mm
Minimum speed (SLOW) 1800 (±150) r.p.m.
Ride On (RON) 2800 (±100) r.p.m.
Front mover (FM) 3200 (±100) r.p.m.
Oil sump capacity 1,70 litres
Weight 36 kg
3.3. Adjustments
Distance between spark plug
electrodes 0,7 - 0,8 mm
Coil air gap 0,3 - 0,40 mm
Inlet valve clearance 0,10 - 0,15 mm
Exhaust valve clearance 0,10 - 0,15 mm
Generator charge 3,0 ÷ 4,0 Ω(Ohm)
3. TECHNICAL DATA AND SPECIFICATIONS
3.4. Expendable materials
Petrol Unleaded (green)
minimum 90N.O.
Engine oil
- from 5 to 35 °C
-from -15to +35°C
SAE 30 - 10W30
Spark plug RN9YC (Champion)
or equivalent
3.5. Use limits
The following table gives the use limits of certain
components subject to wear, after which the
component must be replaced.
TRE 586VA - TRE 586V
TRE 635V
Brushes lenght starter push
botton 11,7 ÷ 8,0 mm
Compression 12,5 bar
Minimum inlet valve stem
diameter 6,515 mm
Minimum exhaust valve stem
diameter 6,495 mm
Minimum inlet valve head rim
thickness 2,70 mm
Minimum exhaust valve head
rim thickness 3,20 mm
Valveseatwidth 2,0 mm
Minimum valve spring length 39,0 mm
Maximumgapbetweenendsof
cylinder rings 1,0 mm
Max. axial gap for compression
rings 0,11 mm
Minimumgudgeon pindiameter 16,90 mm
Max. gudgeon pin-piston seat
diameter 17,07 mm
Max.connecting
rod diameter
gudgeon pin
side 17,07 mm
crank side 38,075 mm
Diameter connecting rod’s pin
on engine shaft 37,93 mm
Verify the engine shaft extremes 0,10 mm
DiameterPump seatoncamshaft 15,916 mm
Diameter aspiration cam 29,75 mm
Diameter discharge cam 29,75 mm
Diameter oil pump seat 40,90 mm
Height pump cylinder 8,90 mm
Cylinder/seat clearance on the
pump 0,34 mm
Month of
manufacture
Year of manufacture
Monthly
progress reading
INDEX
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pag. 10
Release 00 - 12/2019
Engine TRE 586V-TRE 586VA-TRE 635V
Service manual
3. TECHNICAL DATA AND SPECIFICATIONS
3.6. Tightening torques
8-12 Nm
25-32 Nm
8-12 Nm
8-12 Nm
50-55 Nm
8-12 Nm
8-12 Nm
8-12 Nm
8-12 Nm
8-12 Nm
8-12 Nm
24-32 Nm
8-12 Nm11-13 Nm8-12 Nm
80-100 Nm
24-32 Nm
INDEX
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