stt-diesel ipl manual 06227 complete

ILLUSTRATEDPARTS MANUAL

Part No. 06227Printed 3/2012Printed in USA

© 2012Scag Power EquipmentDivision of Metalcraft of Mayville, Inc.

Model STT-DieselTurf Tiger

IPL30

31

32

33

34

2933

36

37

40

39

38

41

35

1818

This manual conTains The illusTraTed parTs lisT for models:

sTT61V-28caT with a serial number of G5000001 to G5099999 sTT-28caT with a serial number of G5500001 to G5599999 smT-72V with a serial number of G6600001 to G6699999

i

RTable of contents

Table of contents61V & 72V cuTTer deck ................................................................................................................................2

cuTTer deck conTrols .............................................................................................................................4

sheeT meTal componenTs ........................................................................................................................6

sTT roll-oVer proTecTion sYsTem .......................................................................................................8

sTT suspension seaT ................................................................................................................................10

deck driVe componenTs .........................................................................................................................12

enGine & aTTachinG parTs - caT diesel ..............................................................................................14

radiaTor & aTTachinG parTs - caT diesel ..........................................................................................16

Brake and sTeerinG componenTs ......................................................................................................18

fuel and hYdraulic sYsTem - caT diesel ..........................................................................................20

Bdp-16a hYdraulic pump assemBlY wiTh coolinG fan .................................................................22

elecTrical sYsTem - caT diesel ...........................................................................................................24

replacemenT decals and informaTion plaTes .............................................................................26

elecTrical schemaTic - caT diesel .....................................................................................................28

2

R section 8

61V & 72V cutter deck

14 15 16

17

23

19

18

5

11

6566

68

34

12

12

64

57

a

a

B

B

1

7 9

86

5

3

5

45

62

58

48

56

61

61

711

79

57

20

57

84

48

83

2

69

10

26

42

39

21

74

7323

24

22 20

20

27

30

14

29

32

33

28

35

31

25

43

44

34

30

85

52

51

54 55

2012 STT-28CAT CD

4

7

23

78

6

59

50

63

49 22

20

47

86

60

46

6

7

48

7381

77

75

80

76

3738

36

67

7071

72

11

13

34

3

6

40

41

23

48

53

50

5982

127

672V Only

7474

87

3

Rsection 8

61V & 72V cutter deck

ref. no.

part no. description 61 72ref. no.

part no. description 61 72

12

3

456

78910

11

1213

1415

161718

19

20

212223

242526272829303132333435

36

3738394041

42

4344

481625-0149179649188349188204001-172

04020-094892604041-07

04021-094814104063-0148274648274748274448274648321548374148198048114-04461516

04020-1604021-1348763

04001-79

04019-03

4512404594404001-12

48038461663435894810244364443312481022481025481035432974329648677

48317648317404040-0404021-0404063-0804043-0604001-41

4828794828824359004001-176

Wing Nut, 3/8-16Belt CoverBelt Cover RHBelt Cover LHBolt, Hex Head 1/4-20 x 1” Grd 8Nut, 5/8-11 UNCTapered Hub, 1-1/8” BoreFlatwasher, 3/8” (.391 x .938 x .105)Nut, Hex Elastic Stop 3/8-16Tapered Hub, 1” BoreKey, 1/4 x 1/4 x 1-1/4”Pulley, 6.75 O.D.Pulley, 6.95 O.D.Pulley, 5.75 O.D. Pulley, 6.75 O.D.Pulley, IdlerBelt, Cutter Deck Drive Belt, Cutter Deck DriveGrease FittingPusharm (incl. items 14, 16, & 18)Nut, Hex Head 5/8-18 UNFNut, Hex Elastic Stop 5/8-11Rod End, 5/8” Male RH ThreadBolt, Hex Head 5/8-11 x 4-1/2”Nut, Hex Serrated Flange 5/16-18Push Arm ShaftRoller ShaftBolt, Hex Head 5/16-18 x 1-3/4”Wheel, Anti-ScalpSpindle AssemblySpindle ShaftSeal, TopSpindle HousingSpacer, OutsideBearing AssemblySeal, BottomNut, Special 1-1/16-18Spindle Bushing, BottomSpacer, InsideRelief Fitting, Tapered SpindleWear PadWear PadFlatwasher, 5/16”Nut, Center Lock 5/16-18Key, 1/4 x 1/4 x 2”Flatwasher, 5/8” HardenedBolt, Hex Head 5/8-11 x 9-1/2”Cutter Blade, 21”Cutter Blade, 24.5”Spacer, Spindle BottomBolt, Hex Head 5/16-18 x 1-3/4”

XX

XXX

XXXXX

X

XX

X

XXX

X

X

XXX

XXXXXXXXXXXX

XX

XXXX

XX

X

X

X

XX

XXX

XXXX

X

XX

XX

XXX

X

X

XXX

XXXXXXXXXXXX

X

XXXXX

X

XX

X

45

4647

48

49505152535455

5657

58

5960616263

64

6566676869

707172

7374

757677

78

79

8081

82

8384

85

8687

42484142491704003-2342420942485604021-22

48229548100-1548163204021-0542247804003-2604017-27

04110-0304019-04

04001-20

04001-54436814822448370404043-04

04001-136

46184204003-1204021-10424798482486

4376342479904001-154

04030-0304040-15

04021-1104003-1204040-11

04001-62

04003-40

483167461929

46241146214448337846184646213204001-108

04001-09484368

Baffle, Custom Cut 61VBaffle, Custom Cut 72VBolt, Carriage 3/8-16 x 1”Discharge Baffle 61VDischarge Baffle 72VNut, Hex Elastic Stop 5/16-18 Grd 8Wheel, Anti-ScalpBushing, .376 I.D. OiliteAnti-Scalp WheelLocknut, 3/8-16 Center LockAnti-Scalp Wheel BracketBolt, Carriage 3/8-16 x 4”Bolt, Hex Serrated Flange 3/8-16 x 1”U-Nut, 3/8-16Nut, Hex Serrated Flange 3/8-16Bolt, Hex Head 3/8-16 x 1-1/2”Bolt, Hex Head 3/8-16 x 3”Pivot, Idler - ShortBearings, BallSpring, Cutter DeckFlatwasher,3/8-.39 x .938 x .105 HDBolt, Hex Head 3/8-16 x 1-1/2” Grd 8Idler Arm, Cutter DeckBolt, Carriage 5/16-18 x 3/4”Nut, Elastic Stop 5/16-18Mounting Plate, RH GearboxGearbox Assembly, Deck DriveSpacer, Gearbox MountMounting Plate, LH GearboxBolt, Hex Head 5/16-18 x 4-3/4”Lockwasher, 5/16”Flatwasher, 5/16” (.375 x .875 x .083)Nut, Elastic Stop 7/16-14Bolt, Carraige 5/16-18 x 3/4”Flatwasher, 7/16-.500 x 1.25 x .083Bolt, Hex Head 3/8-16 x 3-1/4”Bolt, Carriage 7/16-14 x 1-1/4”Bolt, Deck AdjustLever Assy, Deck Level (Incl. 80)Cutter Deck 61 V w/DecalsCutter Deck 72 V w/DecalsSpring, Discharge ChuteDischarge Chute 61VDischarge Chute 72VBolt, Hex Head 5/16-18 x 4-1/2”Bolt, Hex Head 5/16-18 x 1"Cap, Spindle

X

XXX

XXXXXXX

XX

X

XXXXX

X

XXXXX

XXX

XX

XXX

X

X

XX

XX

XX

XXX

XXXX

XXXXXXX

XX

X

XXXXX

X

XXXXX

XXX

XX

XXX

X

X

XX

X

XX

X

XX

4

R section 8

cuTTer deck conTrols

STT-28CAT 2008CDC

6 4

21

19

14

32

3536

34

3319

14

11

13

4

32

5

44

1

4241

38

14

3940

37

43

45

7

89

12

18

17

16

15

21

14

19

20

22

27

14

1928

1419

2526

23

14

19

CUTTER DECK

19

28

302425

29

24

31

2526

14

24

10

5

Rsection 8

cuTTer deck conTrols

ref. no.

part no. description

123456789101112131415161718192021222324252627282930313233343536373839404142434445

48176404020-2848176604050-10459054348748242904009-0248100-1448142846210242485704014-0304019-0442350904003-0442238142346304001-2004019 -0348159848114-044352604020-0904040-0904061-07459044854004004-484619294352704021-0504050-0804041-1448154704067-0904021-0942450404021-0704030-0704105-0148176504001-7404020-2743391

Link, Deck LiftNut, Jam 1/2-20 LHRod End, Female - 1/2-20 LHRing, Retaining 1/2” External “E”Bellcrank Weldment, RH RearPin, DeckliftSlide Weldment, Height AdjustmentBolt, Shoulder 1/2 x 3/4”Bushing, .502 ID.Grip, Deck LatchDeck Latch (Includes items 9 & 10)Lockplate, DeckliftScrew, Cap 5/16-18 x 3” FHHSNut, Hex Serrated Flange 3/8-16Guide, LongBolt, Carriage 5/16-18 x 1”Guide, ShortBracket, Cutting Height AdjustmentBolt, Hex Head 3/8-16 x 1-1/2”Nut, Hex Serrated Flange 5/16-18Spring, Helper (61” & 72” Cutter Decks Only)Grease FittingSwivel Joint, LHNut, Hex 5/8-11Flatwasher, 5/8” (.656 x 1.312 x .095)Cotter Pin, 3/16 x 1”Bellcrank Weldment, LH RearChainStud, 5/8-11 x 26.0”Lever Assembly, Deck LevelSwivel Joint, RHLocknut, 3/8-16 Center LockRing, Retaining 1” External “E”Flatwasher, 1” (1.062 x 1.50 x .048)Lanyard, Deck Height PinRing Pin, 1/2 x 3.06”Nut, 3/8-16 Elastic StopFoot Pedal, Height AdjustmentNut, Hex Elastic Stop 1/2-13Lockwasher, 5/8”Capscrew, 5/8-11 x 1-1/2”Rod End, Female - 1/2-20 RHBolt, Hex Head 1/2-13 x 3”Nut, Jam 1/2-20 RHSpacer, Decklift Pedal

6

R section 8

sheeT meTal componenTs

2011 STT-28CAT SMC

1

6

25

31

9

5

4

2

3

32

34

35

42

33

35

36

37

39

40

41

43

46

32

45

44

44

38

38 45

28

16

9

21

19

17

15

20

18

22

23

24

7

18

2930

9

49

50

51

12

8

13

8

48

A

A

11

11

47

10

10

10

10

14

27 26

7

Rsection 8

sheeT meTal componenTs

ref. no.


1234567891011121314151617181920212223242526272829303132

33343536373839404142434445464748495051

04001-1454102004021-0748128446233042484704001-1904019-0504019-0304019-0204001-0204050-0149173045148104003-01*42268204003-124620074866104029-0104021-0942448804001-1904019-0404017-2745148004021-0904021-1104030-0504001-2845220245220348419504021-2048165748102504021-07435844358304001-167451416482028-019278548262248262148114-104856604001-117484341491731483371

Bolt, Hex Head 1/2-13 x 3.5”WeightNut, Hex Elastic Stop 1/2-13Bumper, Rubber 5/16-18 x 5/8”Main Frame Assembly w/DecalsFoot PlateBolt, Hex Head 3/8-16 x 1”Nut, Hex Serrated Flange 7/16-14Nut, Hex Serrated Flange 5/16-18Nut, Hex Serrated Flange 1/4-20Bolt, Hex Head 1/4-20 x 1-1/4"Retaining Ring .625" EXT. "E"Seat Plate Weldment w/DecalFender Weldment, RHBolt, Carriage 1/4-20 x 6”Battery (not avail. through Scag)Cover, BatteryBolt, Carriage 5/16-18 x 3/4”Plate, Battery BoxRubber PadWing Nut, 1/4-20 x 3/4”Nut, Elastic Stop 3/8-16Battery Box MountBolt, Hex Head 3/8-16 x 1”Nut, Hex Serrated Flange 3/8-16Screw, Hex Serrated Flange 3/8-16 x 1”Fender Weldment, LHNut, Hex Elastic Stop 3/8-16Nut, Elastic Stop 7/16-14Lockwasher, 7/16”Bolt, Hex Head 7/16-14 x 1-1/4”Extention Weldment, Caster (Use with 61” Deck)Extention Weldment, Caster (Use with 72” Deck)Cap, GreaseNut, Hex Elastic Stop 1.0”-14Bearing W/RaceSeal, 2.00” OD. x 1.625” BoreNut, Hex Elastic Stop 1/2-13Spacer, Caster WheelSleeve, Caster Wheel Bolt, Hex Head 1/2-13 x 9-1/2” Yoke Weldment, Caster Plug, 1/4-28 THD FormWheel Assembly, (Inc. 44, 45, & 46)SealBearing w/ RaceGrease FittingCable, Seat StopBolt, Hex Head 7/16-14 x 1-3/4"Grip, Seat LatchLever Assembly, Seat ReleaseSpring, Seat Latch

8

R section 8

2

3

4

4

2

3

4

34

1

1

1

7

8

6

9

5

7

5

11

1011

6 10

9

2

5

5

sTT roll-oVer proTecTion sYsTem

9

Rsection 8

sTT roll-oVer proTecTion sYsTem

ref.no.


1234567891011

46221004001-8704021-1904040-1348416804001-16304021-07425487484170484169484167

STT, ROPSBolt, Hex Head 1/2-13 x 4”Nut, Center Lock 1/2-13Flatwasher, 1/2-.562 x 1.375 x .109Pin Assembly (incl. #9 & #10)Bolt, Hex Head 1/2-13 x 3-3/4”Nut, Center Lock 1/2-13Stop Bracket, ROPSSpring, ROPSClip, ROPSSpring Clip, ROPS

10

R section 8

sTT suspension seaT

3

4

7

65

11

10

9

8

4

3 12

2

13

12

12

12

12

15

16

14

11

Rsection 8

ref. no.


12345

67

8910

11

1213141516

929204001-17804040-11483594482950482945482946482940482943482948482942482952482944482948482941

04001-1248344004041-0704019-03491730

Suspension Seat Assembly w/seat beltBolt, Hex Head 7/16-20 x 1”Flatwasher, 7/16-.500 x 1.25 x .083Retractable Seat Belt Armrest OnlyArmrest Assembly Kit, LHArmrest Assembly Kit, RHBack Cushion KitLumbar KitKnob KitShock Absorber KitSeat Adjustment, Track SetWeight Adjustment KitKnob Kit Seat Cushion KitSeat Drain Kit (Included with Seat Cushion)Bolt, Hex Head 5/16-18 x 1-3/4"Wire Harness AdapterFlatwasher, 3/8-.391 x .938 x .105Nut, Serrated Flange 5/16-18Seat Plate Weldment w/Decal

sTT suspension seaT

12

R section 8

deck driVe componenTs

Frame

33

D

77

29 78

11

C

D

B

B

C

AA

A

2011 STT-28CAT DDC

6

45

23

29

61

50

27

40

42

27

41

38

26

3

5352

30 28

69

26

56

7071

69

7273

74

64

6568

67

66

31

57

58

5919

60

4647

43

49

751

10

55

54

144 48

23

28

1929

2524

87

39

9

6263

36

10

14

1834

3534

33

32

36

1617

31

18

22

2120

19

19 11

A

A

37

A

10

11

13

14

15

2

1

1

1

1

3

3

12

5

10

10

20

75

18

76

10

44

4

79

13

Rsection 8

deck driVe componenTs

ref. no.

part no. descriptionref. no.


123456789101112131415161718192021222324252627282930313233343536373839404142434445

04019-0242392504003-0704003-024815314377204030-0504002-2604063-2304019-0404021-0904001-1354328648130904011-1104019-0604001-18504001-2104043-04482244363146160848274448373548373248188404001-17204063-2704021-0548321404001-13648308804001-1904041-0742476404019-0348128442469104003-124813984814604818146201104021-1043587

Nut, Serrated Flange 1/4-20Belt Guard, RearBolt, Carriage 1/4-20 x 1/2”Bolt, Carriage 1/4-20 x 3/4”Hinge, Belt GuardStub ShaftLockwasher, 7/16” SpringBolt, Hex Head M10 x 1.5 x 35Key, 1/4 x 1/4 x 3-1/4”Nut, Serrated Flange 3/8-16Nut, Elastic Stop 3/8-16Bolt, Hex Head 3/8-16 x 1-3/4” Grd 8SpacerLatch, HoodScrew, #10-32 x .56Nut, Serrated Flange 1/2-13Bolt, Hex Head 1/2-13 x 2” Grd 8Bolt, Hex Head 3/8-16 x 1-3/4”Washer, 3/8” HardenedBall BearingSpacer, Idler BearingIdler Arm Weldment, Pump DrivePulley, 5.75” O.D.Belt, Pump DrivePulley, 6.35 Dia. - 1.125 BoreTapered Hub, 17mm BoreBolt, Hex Head 1/4-20 x 1” Grd 8Key, 5 x 5 x 35 mmNut, Center Lock 3/8-16Pulley, Idler 4” Dia.Bolt, Hex Head 3/8-16 x 1-1/2” Grd 8Spring, Transmission IdlerBolt, Hex Head 3/8-16 x 1”Flatwasher, 3/8-.391 x .938 x .105BracketNut, Serrated Flange 5/16-18Bumper, RubberCover, RearBolt, Carriage 5/16-18 x 3/4”Pulley, 6.35 Tapered BoreBelt, Deck DrivePulley, Idler 5” Dia.Clutch, Ogura GT 3.5 - 1.125 BoreNut, Hex Elastic Stop 5/16-18Spacer

46474849505152535455565758596061626364656667686970717273747576777879

48243304001-1104040-0442346504001-1004102-0304041-2804001-10904030-0248153648343004001-1714616094363204001-17004063-0604001-1764616654810244353448114-04486774364448102243296433124810254329748103545200548243804063-2004012-08425214

Rod Assembly, Clutch Anti-RotationBolt, Hex Head 5/16-18 x 1-1/2”Flatwasher, 5/16”Bracket, Anchor, Anti-RotationBolt, Hex Head 5/16-18 x 1-1/4”Bolt, Hex Head 7/16-20 x 2-1/4”Flatwasher, 7/16-.469 x 1.75 x .25Bolt, Hex Head 1/4-20 x 1-3/8”Lockwasher, 1/4” SpringTapered Hub, 1” BoreSpring, PTOBolt, Hex Head 3/8-16 x 4-1/2” Grd 8Idler Arm Weldment, PTO DrivePivot, Idler PTOBolt, Hex Head 3/8-16 x 2-1/2” Grd 8Key, 1/4 x 1/4 x 1-1/2”Bolt, Hex Head 5/16-18 x 1-3/4” Grd 8Spindle Assembly, Deck DriveSeal, 2.0 OD x 1.5 BoreShaft, Deck DriveGrease Fitting, 1/4-28Relief FittingSpindle HousingRoller Bearing TaperedSpacer, InsideSpacer, OutsideSeal, 2.0 OD x 1.625 BoreSpindle Bushing, BottomNut, 1.06-18 ThreadPump Mounting Plate WeldmentDriveshaftKey, 1/4 x 1/4 x 1”Set Screw, 3/8-16 x 3/4” Torx SocketBracket, Idler Stop

14

R section 8

enGine & aTTachinG parTs - caT diesel

TORADIATOR

CAP

B

2012 STT-28CAT EAP

B

1

1

18 19

67

8

14

910

11

12

13

23

24

60

7

447

4645

1845

18

5754

47

4849

5754

4856

48

55

18

18

1852

51

50

18

18

5958

18

22

2113

17

17

2017

20

1713

16

15

3

2

4

7

3

5

a

5354

c

33

31

3029

43

d

2627

283

2734

25

35

283

38

32

36

39 4041

42

d

37

a

50

64

65

66

4c

63

62

61

7

60

25

15

Rsection 8

enGine & aTTachinG parTs - caT diesel

ref. no.



123456

78910111213141516171819202122

232425262728293031323334353637383940414243

4445

48373904040-0404017-16483781462116

04019-0304040-0542463448350742463304009-0704001-2104041-074374048347104019-0404021-0904041-1104110-0142491004017-05

04001-17645200548136-0948456904002-1204030-0348343348181104002-2104030-0248374604011-06424580424921

4838414377204030-0504002-26483360

424924483756

** Hose, Coolant Resrvoir BottleOverflow Tank Assy. (includes #5)Flatwasher, SAE 5/16-.344 x .688 x .065Bolt, Hex Head Serr. Flng 5/16-18 x 3/4”Cap, Overflow TankHood Assembly w/Decals (incl. 8, 9, 10, 11, 12, and 13)Nut, Serrated Flange 5/16-18Flatwasher, 3/8-.406 x .812 x .065Lock, Hood LatchSpring, Hood LatchLatch, HoodBolt, Shoulder 5/16-18 x 1/2”Bolt, Hex Head 3/8-16 x 1-3/4”Flatwasher, 3/8-.391 x .938 x .105Spacer, HoodDisc, Anti FrictionNut, Serrated Flange 3/8-16Nut, Elastic Stop 3/8-16Flatwasher, 3/8-.406 x 1.50 x 7 GaugeU-Nut, 1/4”-20Muffler GuardBolt, Hex Head Serrated Flange, 1/4-20 x 3/4”Bolt, Hex Head 5/16-18 x 1-3/4” Grd 8Pump Mounting Plate WeldmentClamp, 2-1/4” Max. Dia.Hose, Air IntakeBolt, Hex Head M8-1.25 x 20Lockwasher, 5/16” SpringElbow, 45 DegreeOil Pressure SenderBolt, Hex Head M6-1.0 x 16Lockwasher, 1/4” SpringThrottle CableScrew, Self TappingClampMounting Bracket, Throttle Cable** Gasket, MufflerMuffler, Cat DieselStub Shaft, (Cat)Lockwasher, 7/16” SpringBolt, Hex Head M10 x 1.5 x 35Temperature Sensor, Engine Coolant** Engine, Cat Diesel 28HP (Available only through Cat Dealers)Mount, RadiatorMount, Radiator Isolation

464748495051525354555657585960616263646566

42490742490648335142445204001-1904040-1504021-2204030-0404021-0942444942444804041-1104002-2404030-0604001-1942591904003-12483485483635483636483637

Mounting Bracket Weldment RHMounting Bracket Weldment LHMount, Engine IsolationPlate, Rear Engine MountBolt, Hex Head 3/8-16 x 1”Flatwasher, 5/16” (.375 x .875 x .083)Nut, Elastic Stop 5/16-18 Grade 8Lockwasher, 3/8” SpringNut, Elastic Stop 3/8-16Plate, Engine Mount LHPlate, Engine Mount RHFlatwasher, 3/8” (.406 x 1.50 x 7 ga)Bolt, Hex Head M12-1.25 X 25mmLockwasher, 1/2” SpringBolt, Hex Head 3/8-16 x 1”Bracket, Air Cleaner MountBolt, Carriage 5/16-18 x 3/4”Air Filter Assembly (Enginaire p/n 68665)Rain Cap (Enginaire p/n 68381)Air Filter, Inner (Enginaire p/n 68300)Air Filter, Outer (Enginaire p/n 68340)

** Available through the individual engine manufacturer.

16

R section 8

radiaTor & aTTachinG parTs - caT diesel

STT CAT 2012 RAP

A

C

BB

BB

C

CC

1

4

3

3

4

95

9

810

11

6

6

89

10

109

8

7

1413

28

28

31

3014

3014

22

1413

910

8

109

8

810

21

7

27

17

20 29

26

24

25

2324

2

1729

1213

1516

1314

14

A

19

16

1516

1718

16

17

Rsection 8

radiaTor & aTTachinG parTs - caT diesel

ref. no.


12345678910111213141516171819202122232425262728293031

45228804001-2304015-19483745

48130904011-1104001-0604030-0204040-14 42494442592904041-0704021-0904020-0304030-0348375642494704002-0342492445204245200848376448136-1448376548375042493348375504019-0304041-11452001483767483809

Debris Screen WeldmentBolt, Hex Head 3/8-16 x 4-1/2”Bolt, Socket Head 3/8-16 x 4-1/2”Foam, Seal, 1/2” x 1/4” x 14-1/2”** Radiator CapLatch, HoodScrew, #10-32 x .56Bolt, Hex Head 1/4-20 x .63”Lockwasher, 1/4” SpringFlatwasher, 1/4” (.312 x .750 x .065)HeatshieldBracket, Radiator SupportFlatwasher, 3/8” (.391 x .938 x .105)Nut, Elastic Stop 3/8-16Nut, 5/16-18Lockwasher, 5/16”Mount, Radiator IsolationBracket, Radiator Mount to EngineBolt, Hex Head M8 x 1.25 x 25Mount, RadiatorGuard, FanShroud Weldment, RadiatorHose, Upper RadiatorClamp, Hose, 1-3/4”Hose, Lower RadiatorRadiatorSupport, Debris ScreenMount, Radiator IsolationNut, Hex Serrated Flange 5/16-18Flatwasher, 3/8” (.406 x 1.50 x 7 ga)Guard, BeltAlternator Belt (not shown)Alternator (not shown)


18

R section 8

Brake and sTeerinG componenTs

STT DB&SC

A

1

10

9

33

17

9

19

23

41

1121

34

36

57 73

48

46

42

43 44 83

15

56

70

69

71

62

65

64

67

60

5251

50

34

35

TO RH PUMP

TO LH PUMP

3736

27

28

35

33

77

34

31

3029

8

11

32

13

B

9

B

25

18

72

49

5554

6

26

84

68

66

3736

61

59

7

20

13

14

22

14

39

1624

3863

24

38

12

78

22

21

A

40

79

76

45

2

75

43

6

74

80

81

85

53

34

5885

C

C

59

11

82

5

47

82

82

86

86

19

Rsection 8

Brake and sTeerinG componenTs

ref. no.



12

34567

89101112131415161718

192021222324252627282930313233343536373839404142434445

48437646240246240304001-0904030-0348325048323845148345148404001-1704021-1004001-4504021-09423488482244360704069-0104001-1304021-1346160146160204003-044360004003-1204019-0304050-01436024591804003-0204040-1404021-084347748138904060-0104061-0648258604020-2548368004020-2648258504021-0548415148233048114-0446108248154804001-2243773

Grip, Handle BarHandle Bar, LH (Includes item 1)Handle Bar, RH (Includes item 1)Bolt, Hex Head 5/16-18 x 1”Lockwasher, 5/16”Rubber SpacerBar, Control LeverControl Lever Weldment, LHControl Lever Weldment, RHBolt, Hex Head 5/16-18 x 2”Nut, Hex Elastic Stop 5/16-18Bolt, Hex Head 3/8-16 x 2”Nut, Hex Elastic Stop 3/8-16Mount, Control Linkage Ball Bearings, Neutral ReturnSpacerPin, Rue Cotter 3/8 Dia.Bolt, Hex Head, 5/16-18 x 2.75 ZincNut, Hex Elastic Stop 5/8-11Bracket, Control Lever LHBracket, Control Lever RHBolt, Carriage 5/16-18 x 1”Spacer, Bearing Bolt, Carriage 5/16-18 x 3/4”Nut, Hex Serrated Flange 5/16-18Ring, Retaining 5/8” External “E”SpacerBracket, Neutral ReturnBolt, Carriage 1/4-20 x 3/4”Flatwasher, 1/4” (.312 x .750 x .065)Nut, Hex Elastic Stop 1/4-20Pin, Retaining SpringSpringRoll Pin, Spring 5/32 x 3/4”Pin, Cotter 9/16 x 1-1/2”Rod End, Male 3/8-24 RH ThreadNut, 3/8-24 RH ThreadTube, Control LinkNut, Hex 3/8-24 LH ThreadRod End, Male 3/8-24 LH ThreadLocknut, 5/16-18, Elastic StopGas DamperRod End, 3/8-24 RH FemaleGrease FittingLever, Parking Brake (Inc. item 43)Grip, Parking BrakeBolt, Hex Head 3/8-16 x 2-3/4”Swivel Joint

46474849505152535455

56575859

60616263646566676869

7071727374757677787980818283848586

48343-0404064-0204062-0104004-494854448206104001-0804001-19248163704010-12

04001-324595348373704001-19004001-5204021-1904009-1048410804001-124837014248944306346210404063-2548185048185148185204028-024868042237304001-2042349104017-1604001-7904001-3248163804001-16804003-0548326904021-0504019-0404041-0704040-0504001-21

Clevis, Traction ControlPin, ClevisHair Pin CotterRod, Parking BrakeRod End, LH ThreadBushing, Self AlignBolt, Hex Head 5/16-18 x 3/4”Bolt, Hex Hd 3/8-24 x 5-1/2”Switch, Parking BrakeScrew, Hex Slotted Washer Head #10 32 x 3/4”Bolt, Hex Head 3/8-16 x 1-1/4”Bellcrank, Brake ActuatorSpringBolt, Hex Hd 1/2-13 x 2-3/4” (upper)Bolt, Hex Hd 1/2-13 x 2-1/2” (lower)Locknut, Hex 1/2-13 Center LockBolt, Shoulder 1/2 x 3/8-16 x 2-3/4”Wheel Motor, ParkerBolt, Hex Head, 5/16-18 x 1.75, ZincBrake CaliperMounting Bracket, BrakeSpacerWheel Hub/Disk Brake AssemblyKey, Woodruff 5/16 x 1”Wheel Assembly 24 x 12-12 Turf MasterRim W/Valve StemTire, 24 x 12-12 Turf MasterLug Nut, 1/2-20Nut, Hex CastleThreaded PlateBolt, Hex Head 3/8-16 x 1-1/2”Actuator, SwitchBolt, Hex Serrtd Flng 5/16-18 x 3/4”Bolt, Hex Head 5/8-11 x 4-1/2”Bolt, Hex Head 3/8-16 x 1-1/4”Switch, Handle NeutralBolt, Hex Head 3/8-16 x 1-1/4” Grd 8Bolt, Carriage 3/8-16 x 1-1/2”KnobNut, Center Lock 3/8-16Nut, Serrated Flange 3/8-16Flatwasher, 3/8-.391 x .938 x .105Flatwasher, 3/8-.406 x .812 x .065Bolt, Hex Head, 3/8-16 x 1-3/4”

20

R section 8

fuel and hYdraulic sYsTem - caT diesel

2011 STT-28CAT F&HS

d

e

f

c

ih

19

19

55

45

19

43

62

Z

4

4

61

27

G

aB

4

5

3

4

ToinJecTion

pump

32

48

5453

20

fromfuelrail

23

f

e

G

27

22

25

26

30

24

31

4

34

46

34

d

Ih

3

18

1

1

B

3

65 4

8

9

11

13 16

15

riGhTenGineframerail

4

2

7

48

28

47

3837

27

23

12

17

52

14

41

44

42

41

41

Z

56

59

60

3

27

37

39

3

3

357

c3

a

365

4487

10

35

33

35

3

3

29

5051 38

49

38

2120

21

36

riGhTframerail

407

58

63

23

41

66

64

65

63

37

37

38

37

21

Rsection 8

fuel and hYdraulic sYsTem - caT diesel

ref. no.



12345678

9101112131415161718192021222324

2526272829303132333435

3637383940

48572-064831004881148136-13482266-01482266-0204021-0904043-04

04001-2048310104030-0204001-0404060-0904021-0542269404001-2148179348380548350-0148603-0248938-0242351304001-01461451

48116448150704021-0804010-1042494248257148257248257348257448136-0548351

04003-2248059-04* 483620

04041-07

Union, 3/4”-16 JIC x O-RingPump, Right Hand, BDP 16A*** Hose, 3/8” ID PushlockHose Clamp, 0.69 dia.Elbow, 90 Deg - 9/16 O-Ring x 3/8” HoseElbow, 90 Deg - 3/4 O-Ring x 3/8” HoseNut, Hex Elastic Stop 3/8-16Flatwasher, 3/8” (.391 x .938 x .105) Grade 8Bolt, Hex Head 3/8-16 x 1.5”Pump, Left Hand, BDP-16A Lockwasher, 1/4” SpringBolt, Hex Head, 1/4-20 x 1-1/2”Roll Pin, Spring 3/16 x 3/4”Nut, Center Lock 3/8-16Clamp Plate, Pump ControlBolt, Hex Head, 3/8-16 x 1-3/4”Block, Pump ControlHose Assembly, PumpElbow, 90 Degree, 7/8-14 THDO-RingBushing, 7/8-14 JIC x 3/4-16 O-RingStrap, Hydraulic TankBolt, Hex Head 1/4-20 x 3/4”Oil Reservoir Assembly (includes 26, 30, 31, 32, 33)Cap, Hydraulic TankInsert, Filler NeckNut, Hex Elastic Stop 1/4-20Screw, Phillips Head, 1/4-20Support Bracket, Hydraulic TankBushing, .56 Dia. VitonElbow, 90 Degree .38 HoseBushing, .78 Dia. VitonElbow, 90 DegreeClamp, Hose*** Hose Assembly, 1/2” ID (Oil Reservoir to Filter Base)Bolt, Carraige 3/8-16 x 1”Clamp, Fuel Hose 5/16” ID*** Fuel Hose, 5/16” ID. Non-Perm** Fuel FilterFlatwasher, 3/8” (.391 x .938 x .105)

414243444546474849505152535455

5657585960616263646566

04019-034875848241704001-0948247748571-0248376848059-03481179481778482571481308483749482571462305

42491404003-0742488404019-0242488548250504003-1204017-16484251484242484294

Nut, Serrated Flange 5/16-18Oil FilterOil Filter BaseBolt, Hex Head 5/16-18 x1.0” ZincTee, 3/4 O-Ring x JIC x 1/2” HoseCapFuel Pump, CatClamp, 3/16" ID*** Hose, 3/16” Fuel LineHose FittingBushingValve, Fuel ShutoffFitting, Hose with ScreenBushingFuel Tank Assembly (incl. items 50, 51, 53, 54 & 64)Support Bracket, Fuel TankBolt, Carraige 1/4-20 x 3/4”Mounting Bracket - LH, Oil CoolerNut, Serrated Flange 1/4-20Mounting Bracket - RH, Oil CoolerOil CoolerBolt, Carraige 5/16-18 x 3/4”Bolt, Hex Head 5/16-18 x 3/4”Fuel Gauge Assy. (incl. item 65)Seal, Fuel GaugeCap, Fuel Tank

* High Pressure Fuel Line. MUST only be replaced with the part number listed.** Available through the individual engine manufacturer.*** Order by the inch.

22

R section 8

Bdp-16a hYdraulic pump assemBlY with cooling fan

OR

OR

PORT "A"SIDE

PORT "B"SIDE

Overhaul Seal K

it1

23

4

5

6

7

89

1011

12

13

14

15

1617

17

18

19

20

20

21

21

22

23

24

2526

27

28

29

30

31

3233

34

3536

37

23

Rsection 8

Bdp-16a hYdraulic pump assemBlY with cooling fan

ref. no.


12345678910111213141516171819202122232425262728293031323334353637

HG70740HG51455HG70735HG51462HG51436HG2000015HG2000014HG2000025HG2000024HG2000032HG2000023HG2000038HG51092HG70578HG70738HG70739HG50641HG51437HG9005110-7500HG70743HG70742HG9005200-7500HG70736HG2513030HG9004100-1430HG50406HG50173HG70924HG51457HG70402HG71287HG51348HG52016HG52014HG52256HG44809HG52059

Overhaul Seal KitValve PlateCylinder Block Kit - 16ccThrust Ball Bearing AssemblyVariable SwashplateSlot GuideTrunnion ArmBlock SpringBlock Thrust WasherShaft Ball BearingSpacerRetaining RingSealKit, Pump Shaft (keyed thru taper)Housing KitTrunnion Seal KitPinO-RingStraight Thread PlugShock Valve Kit (.031 Orifice)Shock Valve Kit (.024 Orifice)Straight Thread PlugEnd Cap KitBypass Valve KitO-RingGerotor Assembly (.19 cu.in./rev.)Socket Head Cap Screw (M8 x 1.25-25mm)Charge Pump Kit (.19 STD. Splined)Hex Screw, Flanged Head (M10 x 1.50-65mm)Charge Relief KitFan Kit (incl. items 32, 34, 35, 36)HubBracket, ShroudFanWasherNutShroud

24

R section 8

elecTrical sYsTem - caT diesel

SC

AG

PO

WE

R E

QU

IPM

EN

T

45

3

41

46

46

46

46

45

46

47

45

44

46

2930

31

2930

31

38

3736

25

26 29

3130

29

3130

9

6

8

7

31

35

3233

34

4

2423

22

2011 STT 28CAT ES

4039

TOFUEL

SHUTOFFSOLENOID

TOGLOWPLUGS

TOFUELPUMP

43

3940

21

2

4211

27

28

17

17

11

1920

20

17

13

14

16

15

12

5

1A

A

A

10

18

3031

12

12

25

Rsection 8

elecTrical sYsTem - caT diesel

ref.no.


12345678

9101112

13141516

171819

20212223242526272829303132333435363738394041424344454647

481811

483537462011

4838094837674833604822534829848030-0948030-1048030-11481176-10481176-1104020-0204001-44

48163848375948278448278548182648301348118448118248180548118348395746213848377104040-1404030-0204001-0104090-02924004021-0842367448254404041-1948375804010-0104031-0146214648163748405448374604020-0104110-01451879

** Fuel PumpOil Pressure Sender** Glow Plugs** Fuel Shutoff SolenoidHourmeterClutch, Ogura GT 3.5 - 1.125 Bore** Starting MotorAlternatorAlternator Belt (not shown)Sending Unit, Water Temp.DiodeFuse, 20 AMPClamp, Cable 1/2” ID.Clamp, Cable 3/4” ID.Clamp, Double Cable 5/8” ID.Cable, Battery - Red Cable, Battery - BlackNut, Hex 1/4-20Bolt, Hex Head 1/4-20 x .5”Battery, (Not Available Through Scag)Switch, Interlock, Normally OpenMain Wire Harness, STT CatCircuit Breaker, 50 AMPCover, Circuit BreakerRelay, 12V 40 AMP Hi CapacityRelay, 12V 40 AMP StandardVolt Meter (Includes Mounting Hardware)Indicator Light, Glow Plugs (Includes Mounting Hardware)Engine Oil Pressure Gauge (Includes Mounting Hardware)Water Temperature Gauge (Includes Mounting Hardware)Switch, PTOKey Assembly w/FobKey, IgnitionFlat Washser, 1/4”Lockwasher, 1/4”Bolt, Hex Head 1/4-20 x 3/4”Pop Rivet, 3/16” x 5/8”CupholderNut, Elastic Stop 1/4”-20Bracket, Cupholder MountingRetainer, CupholderFlatwasher, 0.196 ID.Key Switch (Includes Mounting Hardware)Screw, Phillips Washer Head #10-32 x 1/2”Lockwasher, #10 External ToothInstrument Panel, Top w/DecalsSwitch, Interlock, Park Brake Normally OpenElectronic Control ModuleThrottle ControlNut, Hex #10-32U-Nut, 1/4-20Base, Instrument Panel


26

R section 8

replacemenT decals and informaTion plaTes

2

2011 STT-28CAT Decals Page 1

6

FORWARD

REVERSEFR

8

Heavy-DutyCommercial

481971

12 13

1

5

7

4

3

__________ __________ __________ ____________________ __________ __________ ____________________ __________ __________ ____________________ __________ __________ __________

9

1110

16

15

14

SLOW FAST

483358

483762GLOWPLUGS

OFF ON

STARTPREHEAT

MOWER DECKPULL OUT TO ENGAGE

PUSH IN TO DISENGAGE

483633

484292

Avoid injury from burns - Shut o� engine - Allow to cool several minutes - Remove cap slowly - Do not over�ll

DIESEL FUEL ONLY

17

483300

Failure to follow theseinstructions could resultin serious injury or death

Do not operate machine onsteep slopes or near drop o�sAvoid sharp and/or quick turns

Do not exceed the machineweight rating on the ROPSAlways use the seat belt

Do not jump if machine tipswhile ROPS is fully extendedand using seat belt

If ROPS is foldable:Keep ROPS fully extendedwhenever possibleWHEN ROPS MUST BE DOWNDo not use the seat beltDrive with extra care

SERIOUS INJURYOR DEATH MAYRESULT FROM

MACHINE ROLLOVER

AVOID SERIOUS INJURY OR DEATHo Read the Operators Manualo Solicite etiquetas en espanol a un distribudo Scago Operate only on slopes you can back up & never on slopes greater than 15 degreeso If machine stops going up hill, stop blades and back down slowlyo Avoid sudden turnso Do not mow when children or others aroundo Never carry children even with blades o�o Look down and behind before & while backingo Keep safety devices (guards, shields, switches, etc.) in place and workingo Remove oblects that could be thrown by the bladeso Trained operators only 484321

WARNING

READ OPERATOR'S MANUAL

INSTALL BELT COVERBEFORE OPERATING MACHINE

27

Rsection 8

ref. no.



12345

67891011121314151617181920

483407483406483044484292483201483693481568483633481971483402484321483425482565482493484293483762483358483300484320482577483405

Decal, Danger-Spinning BladesDecal, Warning-Rotating BladesDecal, PatentsDecal, Fuel TankDecal, 61” Velocity PlusDecal, 72” Velocity PlusDecal, Traction ControlDecal, Seat ReplacementDecal, Heavy Duty CommercialDecal, Belt CoverDecal, WarningDecal, ROPSDecal, Cutting Height - LowerDecal, Cutting Height - UpperDecal, Start/Drive ProcedureDecal, Instrument Panel - Upper (CAT)Decal, Instrument Panel - Lower (CAT)Decal, ROPS WarningDecal, Checks and AdjustmentsDecal, Turf TigerDecal, Warning

212223242526**

48322948372748404483509481664481663461982

Decal, Turf TigerDecal, Scag LogoDecal, Metalcraft-Made In USADecal, Scag Diesel PoweredDecal, Stripes-RHDecal, Stripes-LHSpanish Decal Kit, STT

replacemenT decals and informaTion plaTes

481569

R

19

2011 STT-28CAT Decals Page 2

21

2625

18

481663

4816

64

24

20

R 483509

R

483727

22

2348404

28

R section 8

elecTrical schemaTic - caT diesel

TERMINAL “I”

TERMINAL “S”

TERMINAL “B”

TERMINAL “A”

POSITION CIRCUIT “MAKE”ACCESSORY B + A

OFF - -

RUN B + I

START B + I + S + A

86

85

87a 87

30

N.O.N.C.

COM.

A

B C

A B

C86

85

87

30

D

D

D

GR

N W

/BL

K S

TR

IPE

PIN

K

WHITE

OR

AN

GE

BR

OW

N

WH

ITE

W/R

ED

ST

RIP

E

YELLOW

BL

AC

K

RE

DR

ED

GR

N W

/WH

T S

TR

IPE

GR

N W

/WH

T S

TR

IPE

RE

D

GR

N W

/BL

K S

TR

IPE

GR

EE

N

GR

EE

N

RE

D

RE

D

RE

DRE

DR

ED

RE

D

RE

D

LIG

HT

BL

UE

BL

UE

BL

AC

K

BL

AC

KB

LA

CK

BLACKBLACK

RE

D

RE

D

WH

ITE

W/B

LK

ST

RIP

EW

HIT

E

BL

AC

K

RE

D

RE

D

BL

AC

K

BL

AC

K

WH

T W

/PU

RP

LE

ST

RIP

E

WH

T W

/PU

RP

LE

ST

RIP

E

PIN

K

ORANGE

BR

OW

N

BLUE

RED

PURPLE

LIG

HT

BL

UE

RE

D

RE

D

BL

AC

K

RE

D

WH

T W

/PU

RP

LE

ST

RIP

E

WH

ITE

W/B

LK

ST

RIP

E

WH

T W

/PU

RP

LE

ST

RIP

EB

LK

W/W

HIT

E S

TR

IPE

BL

UE

BL

AC

K

RE

D

RE

D

OR

AN

GE

WH

ITE

W/R

ED

ST

RIP

E

RE

D

RE

DR

ED

RE

D

RE

DR

ED

RE

D

PIN

K

YELLOW

YELLOW

RED

RED

RED

RED

RED

WHT W/PURPLE STRIPE

WHITE W/RED STRIPE

RE

D

BL

AC

K

BL

AC

K

BL

AC

K

RE

D

REDRED

RED

RE

D

RE

D

WH

T W

/PU

RP

LE

ST

RIP

E

WH

T W

/PU

RP

LE

ST

RIP

E

RED

RED

BL

K W

/WH

ITE

ST

RIP

E

DIODE(600V 2A)

stt-diesel ipl manual 06227 complete

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