service repair workshop manual

1. NOTE:
Model 30581: Use this book along with Part No. 95866SL Mitsubishi S4S--DT Engine Service Manual.
Model 30582 and 30583: Use this book along with Part No. 04131SL Mitsubishi S4S--Y2DT61TG Engine Ser-
vice Manual.
Part No. 90743SL, Rev. G
Service Manual
GroundsmasterR 580--D
Preface
The purpose of this publication is to provide the service
technician with information for troubleshooting, testing,
and repair of major systems and components on the
Groundsmaster 580--D, Model 30580, 30581, 30582,
and 30583 (see NOTE above).
REFER TO THE TRACTION UNIT AND CUTTING
UNIT OPERATOR’S MANUALS FOR OPERATING,
MAINTENANCE AND ADJUSTMENT INSTRUC-
TIONS. Space is provided in Chapter 2 of this book to
insert the Operator’s Manuals and Parts Catalogs for
your machine. Replacement Operator’s Manuals are
available on the internet at www.toro.com or by sending
complete Model and Serial Number to:
The Toro Company
8111 Lyndale Avenue South
Minneapolis, MN 55420
The Toro Company reserves the right to change product
specifications or this publication without notice.
This safety symbol means DANGER, WARN-
ING, or CAUTION, PERSONAL SAFETY
INSTRUCTION. When you see this symbol,
carefully read the instructions that follow.
Failure to obey the instructions may result in
personal injury.
NOTE: A NOTE will give general information about the
correct operation, maintenance, service, testing or re-
pair of the machine.
IMPORTANT: The IMPORTANT notice will give im-
portant instructions which must be followed to pre-
vent damage to systems or components on the
machine.
E The Toro Company -- 1989, 1997, 1999, 2003, 2004, 2005, 2007

2. Rev. EGroundsmaster 580–D
Table Of Contents
Chapter 1 – Safety
Safety Instructions 1 – 1. . . . . . . . . . . . . . . . . . . . . . . . . .
Safety and Instruction Decals 1 – 4. . . . . . . . . . . . . . . .
Chapter 2 – Product Records and Maintenance
Product Records 2 – 1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 2 – 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equivalents and Conversions 2 – 2. . . . . . . . . . . . . . . .
Torque Specifications 2 – 3. . . . . . . . . . . . . . . . . . . . . . .
Chapter 3 – Engine (Model 30580)
General Information 3 – 3. . . . . . . . . . . . . . . . . . . . . . . .
Specifications 3 – 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 3 – 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 3 – 26. . . . . . . . . . . . . . . . . . . . . . . . . . .
General Overhaul Instructions 3 – 30. . . . . . . . . . . . . .
Adjustments 3 – 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Removal and Installation 3 – 39. . . . . . . . . . . .
Engine Accessory Removal and Installation 3 – 43. .
Cylinder Head and Valves 3 – 48. . . . . . . . . . . . . . . . . .
Flywheel, Timing Gears and Camshaft 3 – 61. . . . . . .
Pistons, Connecting Rods,
Crankshaft and Block 3 – 73. . . . . . . . . . . . . . . . . . . . . .
Inlet and Exhaust Systems 3 – 91. . . . . . . . . . . . . . . . .
Lubrication System 3 – 106. . . . . . . . . . . . . . . . . . . . . . .
Cooling System 3 – 112. . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel System 3 – 116. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Overhaul Information 3 – 125. . . . . . . . . . . . . .
Chapter 3A – Engine (Model 30581)
General Information 3A – 1. . . . . . . . . . . . . . . . . . . . . . .
Specifications 3A – 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3B – Engine (Model 30582)
General Information 3B – 1. . . . . . . . . . . . . . . . . . . . . . .
Specifications 3B – 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 4 – Hydraulic System
Specifications 4 – 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information 4 – 3. . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic Flow Diagrams 4 – 6. . . . . . . . . . . . . . . . . . . .
Special Tools 4 – 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 4 – 14. . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing 4 – 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments 4 – 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Traction Drive System Repairs 4 – 32. . . . . . . . . . . . . .
PTO System Repairs 4 – 36. . . . . . . . . . . . . . . . . . . . . .
Auxiliary (Lift/Counterbalance) System Repairs 4 – 42
Steering System Repairs 4 – 52. . . . . . . . . . . . . . . . . . .
Hydraulic Reservoir and Filter 4 – 55. . . . . . . . . . . . . . .
4 Wheel Drive Kit (Optional) Repairs 4 – 57. . . . . . . . .
Chapter 5 – Electrical System
(Model 30580, S/N Below 30101)
Electrical Diagrams 5 – 2. . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 5 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 5 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing 5 – 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repairs 5 – 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 6 – Wheels, Brakes & Steering
Specifications 6 – 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information 6 – 3. . . . . . . . . . . . . . . . . . . . . . . .
Adjustments 6 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repairs 6 – 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 7 – Cutting Units
Specifications 7 – 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustments 7 – 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repairs 7 – 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 8 – Electrical System
(Models 30580 (S/N 30101 & Up), 30581 and 30582)
Electrical Diagrams 8 – 2. . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 8 – 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 8 – 7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Identification and Testing 8 – 10. . . . . . . .
Service and Repairs 8 – 12. . . . . . . . . . . . . . . . . . . . . . .
Chapter 9 – Foldout Diagrams
Hydraulic Schematics 9 – 3. . . . . . . . . . . . . . . . . . . . . . .
Electrical Schematics 9 – 5. . . . . . . . . . . . . . . . . . . . . . .
Wire Harness Drawings 9 – 7. . . . . . . . . . . . . . . . . . . . .

3. Rev. E
CAUTION
Groundsmaster 580--D Page 1 -- 1 Safety
Chapter 1
Safety
Table of Contents
SAFETY INSTRUCTIONS 1. . . . . . . . . . . . . . . . . . . . . .
Before Operating 1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
While Operating 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance and Service 3. . . . . . . . . . . . . . . . . . . . .
SAFETY AND INSTRUCTION DECALS 4. . . . . . . . . .
Safety Instructions
The GROUNDSMASTERR 580-D meets or exceeds
the American National Standards Institute’s safety stan-
dards for riding mowers. Although hazard control and
accident prevention partially are dependent upon the
design and configuration of the machine, these factors
are also dependent upon the awareness, concern, and
proper training of the personnel involved in the opera-
tion, transport, maintenance, and storage of the ma-
chine.
Improper use or maintenance by the operator or owner
of the machine can result in injury. Reduce the potential
for any injury by complying with the following safety
instructions.
TO REDUCE THE POTENTIAL FOR INJURY,
COMPLY WITH THE FOLLOWING SAFETY
INSTRUCTIONS.
Before Operating
1. Read andunderstand theOperator’s Manualbefore
starting and operating the machine. Become familiar
with all controls and know how to stop quickly. Areplace-
ment Operator’s Manual is available on the Internet at
www.Toro.com or by sending complete Model and Seri-
al Number to:
The Toro Company
Attn. Technical Publications
8111 Lyndale Avenue South
Minneapolis, Minnesota 55420--1196.
If you have questions about this Service Manual, please
contact:
The Toro Company
Commercial Service Department
8111 Lyndale Avenue South
Minneapolis, Minnesota 55420--1196.
2. Never allow children to operate the machine or
adults to operate it without proper instruction.
3. Become familiar with the controls and know how to
stop the machine and engine quickly.
4. Keep all shields, safety devices and decals in place.
If a shield, safety device or decal is malfunctioning, illeg-
ible or damaged, repair or replace it before operating the
machine.
5. Always wear substantial shoes. Do not operate ma-
chine while wearing sandals, tennis shoes, sneakers or
when barefoot. Do not wear loose fitting clothing that
could get caught in moving parts and possibly cause
personal injury.
6. Wearing safety glasses, safety shoes, long pants
and a helmet is advisable and required by some local or-
dinances and insurance regulations.
7. Make sure the work area is clear of objects which
might be picked up and thrown by the cutter blades.
8. Do not carry passengers on the machine. Keep ev-
eryone, especially children and pets, away from the
areas of operation.

4. Rev. A Groundsmaster 580--DPage 1 -- 2Safety
9. Since diesel fuel is highly flammable, handle it care-
fully:
A. Use an approved fuel container.
B. Do not remove fuel tank cap while engine is hot
or running.
C. Do not smoke while handling fuel.
D. Fill fuel tank outdoors and only to within an inch
(25 mm) from the top of the tank, not the filler neck.
Do not overfill.
E. Wipe up any spilled fuel.
10. Be sure interlock switches are adjusted correctly so
engine cannot be started unless traction pedal is re-
leased -- neutral position -- and PTO switch is in NEU-
TRAL position.
While Operating
11. Check interlock switches daily for proper operation.
If a switch malfunctions, replace or adjust it before oper-
ating the machine. The interlock system is for your
protection, so do not bypass it. Replace all interlock
switches every two years.
12. Do not run engine in a confined area without ade-
quate ventilation. Exhaust is hazardous and could be
deadly.
13. Sit on the seat when starting and operating the ma-
chine.
14. Before starting the engine each day, test warning
lamps and signal lights to assure proper operation.
15. Pay attention when using the machine. To prevent
loss of control:
A. Mow only in daylight or when there is good artifi-
cial light.
B. Watch for holes or other hidden hazards.
C. Be extremely careful when operating close to
sand traps, ditches, creeks, steep hillsides or other
hazards.
D. Reduce speed when making sharp turns. Avoid
sudden stops and starts.
E. Look to the rear to assure no one is behind the
machine before backing up.
F. Watch for traffic when near or crossing roads.
Always yield the right--of--way.
G. Reduce speed when driving downhill.
16. Keep hands, feet and clothing away from moving
parts and the cutting units.
17. This product may exceed noise levels of 85 dB(A) at
the operator position. Ear protectors are recommended,
for prolonged exposure, to reduce the potential of per-
manent hearing damage.
18. Do not touch engine, turbo--charger, radiator, muf-
fler or exhaust pipe while engine is running or soon after
it is stopped. These areas could be hot enough to cause
burns.
19. Before getting off the seat:
A. Move traction pedal to neutral.
B. Set parking brake.
C. Disengage cutting units and wait for blades to
stop.
D. Stop engine and remove key from switch.
E. Do not park on slopes unless wheels are
chocked or blocked.
20. If a cutting blade strikes a solid object or vibrates ab-
normally, stop immediately, turn engine off, set parking
brake and wait for all motion to stop.Inspect for damage.
Repair or replace any damaged parts before operating.

5. Rev. AGroundsmaster 580--D Page 1 -- 3 Safety
Maintenance and Service
21. Before servicing or making adjustments, stop en-
gine and remove key from the switch.
22. Assure entire machine is properly maintained and in
good operating condition. Frequently check all nuts,
bolts and screws.
23. Frequently check all hydraulic line connectors and
fittings. Assure all hydraulic hoses and lines are in good
condition before applying pressure to the system.
24. If the Groundsmaster 580--D loses power and
needs to be moved, either by--pass the hydraulic pump
or unlock the front wheel hubs. Unlocking the front
wheels disables the machine braking system. Block the
wheels before unlocking the hubs to keep the machine
from moving. To tow the machine, connect to the towing
vehicle with a rigid towing device. Do not use chains,
cables or other non--rigid devices for towing. Lock the
hubs when towing is completed.
25. Keep body and hands away from pin hole leaks or
nozzles that eject high pressure hydraulic fluid. Use
cardboard or paper to find hydraulic leaks. Hydraulic
fluid escaping under pressure can penetrate skin and
cause injury. Fluid accidentally injected into the skin
must be surgically removed within a few hours by a doc-
tor or gangrene may occur.
26. Before any hydraulic system maintenance, stop en-
gine and lower cutting units to the ground so all pressure
is relieved.
27. For major repairs or other assistance, contact your
local Toro Distributor.
28. To reduce potential fire hazard, keep engine area
free of excessive grease, grass, leaves and dirt.
29. If engine must be running to perform maintenance
or an adjustment, keep hands, feet, clothing and other
parts of the body away from cutting units and other mov-
ing parts. Keep everyone away.
30. Do not overspeed the engine by changing governor
setting. Maximum engine speed is 2750 rpm. To assure
safety and accuracy, have an Authorized Toro Distribu-
tor check maximum engine speed.
31. Shut engine off before checking or adding oil to the
crankcase.
32. Disconnect battery before servicing the machine. If
battery voltage is required for troubleshooting or test
procedures, temporarily connect the battery.
33. For optimum performance and safety, use genuine
Toro replacement parts and accessories. Replacement
parts and accessories made by other manufacturers
could be dangerous and may void the product warranty
of The Toro Company.

6. Rev. E Groundsmaster 580--DPage 1 -- 4Safety
Safety and Instruction Decals
Numerous safety and instruction decals are affixed to
the Groundsmaster 580--D. If any decal becomes illeg-
ible or damaged, install a new decal. Part numbers for
replacement decals are listed in your Parts Catalog. Or-
der replacement decals from your Authorized Toro Dis-
tributor.

7. Rev. EGroundsmaster 580--D Page 2 -- 1 Product Records and Maintenance
Chapter 2
Product Records and Maintenance
Table of Contents
PRODUCT RECORDS 1. . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EQUIVALENTS AND CONVERSIONS 2. . . . . . . . . . .
Decimal and Millimeter Equivalents 2. . . . . . . . . . . .
U.S. to Metric Conversions 2. . . . . . . . . . . . . . . . . . . .
TORQUE SPECIFICATIONS 3. . . . . . . . . . . . . . . . . . . .
Capscrew Markings and Torque Values -- U.S. 3. . .
Capscrew Markings and Torque Values -- Metric 3.
Product Records
Insert Operator’s Manual and Parts Catalog for your
Groundsmaster 580--D at the end of this chapter. Addi-
tionally, if any optional equipment or accessories have
been installed to your Groundsmaster, insert the Instal-
lation Instructions, Operator’s Manuals and Parts Cata-
logs for those options at the end of this chapter.
Maintenance
Maintenance procedures and recommended service in-
tervals for the Groundsmaster 580--D are covered in the
Operator’s Manual. Refer to that publication when per-
forming regular equipment maintenance.

8. Groundsmaster 580–DPage 2 – 2Product Records and Maintenance
Equivalents and Conversions

9. Groundsmaster 580–D Page 2 – 3 Product Records and Maintenance
Torque Specifications

10. Chapter 3
Engine (Model 30580)
Table of Contents
NOTE: This Chapter provides engine information for TORO Model 30580.
See Chapter 3A for Model 30581 or Chapter 3B for Model 30582.
GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . 3
Engine Serial Number Location. . . . . . . . . . . . . . 3
Engine External Views. . . . . . . . . . . . . . . . . . . . . 4
Engine Sectional Views. . . . . . . . . . . . . . . . . . . . 5
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Definition of Terms. . . . . . . . . . . . . . . . . . . . . . . . 6
General Specifications . . . . . . . . . . . . . . . . . . . . 7
Service and Overhaul Standards . . . . . . . . . . . 11
Tightening Torques . . . . . . . . . . . . . . . . . . . . . . 20
Sealants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . 23
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 26
GENERAL OVERHAUL INSTRUCTIONS . . . . . . . 30
Determining When To Overhaul The Engine . . . 30
Disassembly Precautions . . . . . . . . . . . . . . . . . 30
Reassembly Precautions. . . . . . . . . . . . . . . . . . 30
Testing Compression Pressure . . . . . . . . . . . . . 31
ADJUSTMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Valve Clearance . . . . . . . . . . . . . . . . . . . . . . . . 32
Priming / Bleeding Fuel System . . . . . . . . . . . . 33
Fuel Injection Timing . . . . . . . . . . . . . . . . . . . . . 34
No-Load Minimum and Maximum Speed . . . . . 35
Throttle Lever and Control Cable Adjustment . . 37
Fuel Stop Solenoid Adjustment. . . . . . . . . . . . . 38
Fan Drive Belt Inspection and Adjustment . . . . 38
ENGINE REMOVAL AND INSTALLATION . . . . . . . 39
ACCESSORY REMOVAL AND INSTALLATION. . . 43
Prepratory Steps . . . . . . . . . . . . . . . . . . . . . . . . 43
Engine Accessory Removal . . . . . . . . . . . . . . . 43
Engine Accessory Installation . . . . . . . . . . . . . . 47
CYLINDER HEAD AND VALVES . . . . . . . . . . . . . . 48
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Inspection and Repair . . . . . . . . . . . . . . . . . . . . 50
Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
FLYWHEEL, TIMING GEARS AND CAMSHAFT . . 61
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Inspection and Repair . . . . . . . . . . . . . . . . . . . . 64
Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
PISTONS, CONNECTING RODS,
CRANKSHAFT & BLOCK . . . . . . . . . . . . . . . . . 73
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Inspection and Repair . . . . . . . . . . . . . . . . . . . . 76
Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
INLET AND EXHAUST SYSTEMS. . . . . . . . . . . . . 91
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Exhaust Manifold . . . . . . . . . . . . . . . . . . . . . . . . 92
Turbocharger . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
LUBRICATION SYSTEM . . . . . . . . . . . . . . . . . . . 106
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Oil Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
COOLING SYSTEM . . . . . . . . . . . . . . . . . . . . . . . 112
Water Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Radiator, Fan and Fan Belt . . . . . . . . . . . . . . . 115
FUEL SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Fuel Injection Nozzles . . . . . . . . . . . . . . . . . . . 117
Fuel Feed Pump . . . . . . . . . . . . . . . . . . . . . . . 120
Fuel Injection Pump. . . . . . . . . . . . . . . . . . . . . 122
Governor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
GENERAL OVERHAUL INFORMATION . . . . . . . 125
Oil Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
O-Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Lock Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Split Pins and Spring Pins . . . . . . . . . . . . . . . . 127
Rev. EGroundsmaster®
580-D Page 3 - 1 Table of Contents

11. Stopping the Engine
Important: Before stopping the engine after mowing
or full load operation, cool the turbocharger by
allowing the engine to idle at low speed for 5
minutes. Failure to do so may lead to turbocharger
failure.
Rev. E

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