John Deere

OMMT6743

Issue F9

Professional Utility Mower

2653A Diesel PIN (080001 - )

Introduction

Safety Signs

Controls

Operating

Operating Cutting Units

Replacement Parts

Service Machine Safely

Service Interval Chart

Service Lubrication

Service Engine

Service Transmission

Service Cutting Units

Service Electrical

Service Miscellaneous

Troubleshooting

Storing Machine

Assembly

Specifications

Metric Bolt and Cap Screw Torque Values

Unified Inch Bolt and Cap Screw Torque Values

Warranty

John Deere Service Literature

John Deere Quality Statement

Copyright© Deere & Company

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Specifications

Engine

Model Yanmar 3TNE68A

Engine Model Number 3008D002

Engine Power 13.4 kW ( (18 hp)

Cylinders 3

Displacement 784 cc ( (47.8 cu. in.)

Lubrication Pressurized

Oil Filter Full Flow Filter

Air Cleaner 4 in. Radial seal, dual stage, restriction indicator

Fuel System

Fuel Diesel

Electrical System

Type 12-volt (0.8 kW) ignition glow plug via rocker switch

Battery 480 CCA (Cold CrankingAmps)

Capacities

Fuel Tank 28 L ( (7.4 gal)

Hydraulic Reservoir 20.8 L ( (5.5 gal)

Cooling System 4.0 L ( (4.2 qt)

Engine Oil (with filter) 3.0 L ((3.1 qt)

Wheel Motor And Reel Drive

Drive Wheels Front, with standard third (rear) wheel drive

Traction Drive Hydrostatic, 2-pedal

Pump Gear

Reel Control Valves Electro-hydraulic

Filtration 10 Microns & 100 mesh strainer

Cutting Unit Lift Hydraulic cylinder for front two units and hydraulic cylinder for center unit

Travel Speeds

Mowing 0-8.1 km/h ((0-5 mph)

Transport 0-12.8 km/h ( (0-8 mph)

Reverse 0-8.1 km/h ( (0-5 mph)

Cutting Units

Number 3

Size 66 cm ( (26 in.) or 76.2 cm ( (30 in.)

Backlapping Standard on machine, variable speed adjustment

Clip Frequency: 5 blade units 0.323/km/h ( (0.201/mph)

Clip Frequency: 8 blade units 0.203/km/h ( (0.126/mph)

Reel Diameter 17.8 cm ( (7 in.)

Bedknife Adjustment 0.05 mm ( (0.002 in.)

Number of Blades 5 or 8

Steering And Brakes

BrakeType Dual 20.3 cm ( (8-inch) disk

Steering Hydraulic power

Dimensions

Wheelbase 140 cm ( (55 in.)

Tread Width 132 cm ( (52 in.)

Mowing Position Width with 26 Inch Reels 183 cm ( (72 in.)

Mowing Position Width with 30 Inch Reels 213 cm ( (84 in.)

Turning Radius Uncut Circle with 26 Inch Reels 50.8 cm ((20 in.)

Turning Radius Uncut Circle with 30 Inch Reels 40.6 cm ((16 in.)

Weight (full fluids, no operator with cutting units) 789 kg ( (1740 lb)

Tires

Front - 20x10-10 151.7 kPa ( (22 psi maximum)

Rear - 20x10-8 82.7 kPa ( (12 psi maximum)

Recommended Lubricants

Engine Oil John Deere PLUS-50®

Engine Coolant Ethylene Glycol Base

Transmission Oil John Deere HY-GARD®

Grease John Deere SPECIAL PURPOSE HD WATER RESISTANT GREASE ( John Deere MULTI-PURPOSE HD LITHIUM COMPLEX GREASE ( John Deere SPECIAL PURPOSE HD CORNHEAD GREASE ( John Deere SPECIAL PURPOSE COTTON PICKER SPINDLE GREASE

(Specifications and design subject to change without notice.)

Metric Bolt and Cap Screw Torque Values


MIF

Class 4.8

Class 8.8 or 9.8

Lubricateda

Drya

Lubricateda

Drya

Size
N·m
lb-ft
N·m
lb-ft
N·m
lb-ft
N·m
lb-ft

M6

4.8

3.5

6

4.5

9

6.5

11

8.5

M8

12

8.5

15

11

22

16

28

20

M10

23

17

29

21

43

32

55

40

M12

40

29

50

37

75

55

95

70

M14

63

47

80

60

120

88

150

110

M16

100

73

125

92

190

140

240

175

M18

135

100

175

125

260

195

330

250

M20

190

140

240

180

375

275

475

350

M22

260

190

330

250

510

375

650

475

M24

330

250

425

310

650

475

825

600

M27

490

360

625

450

950

700

1200

875

M30

675

490

850

625

1300

950

1650

1200

M33

900

675

1150

850

1750

1300

2200

1650

M36

1150

850

1450

1075

2250

1650

2850

2100



MIF

Class 10.9

Class 12.9

Lubricateda

Drya

Lubricateda

Drya

Size
N·m
lb-ft
N·m
lb-ft
N·m
lb-ft
N·m
lb-ft

M6

13

9.5

17

12

15

11.5

19

14.5

M8

32

24

40

30

37

28

47

35

M10

63

47

80

60

75

55

95

70

M12

110

80

140

105

130

95

165

120

M14

175

130

225

165

205

150

260

109

M16

275

200

350

225

320

240

400

300

M18

375

275

475

350

440

325

560

410

M20

530

400

675

500

625

460

800

580

M22

725

540

925

675

850

625

1075

800

M24

925

675

1150

850

1075

800

1350

1000

M27

1350

1000

1700

1250

1600

1150

2000

1500

M30

1850

1350

2300

1700

2150

1600

2700

2000

M33

2500

1850

3150

2350

2900

2150

3700

2750

M36

3200

2350

4050

3000

3750

2750

4750

3500


DO NOT use these values if a different torque value or tightening procedure is given for a specific application. Torque values listed are for general use only and include a 10% variance. Check tightness of fasteners periodically. DO NOT use air powered wrenches.

Shear bolts are designed to fail under predetermined loads. Always replace shear bolts with identical grade.

Fasteners should be replaced with the same grade. Make sure fasteners threads are clean and that you properly start thread engagement. This will prevent them from failing when tightening.

When bolt and nut combination fasteners are used, torque values should be applied to the NUT instead of the bolt head.

Tighten toothed or serrated-type lock nuts to the full torque value.

a "Lubricated" means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings. "Dry" means plain or zinc plated without any lubrication.

Unified Inch Bolt and Cap Screw Torque Values


MIF

Grade 1
Grade 2b

Lubricateda

Drya

Lubricateda

Drya

Size
N·m
lb-ft
N·m
lb-ft
N·m
lb-ft
N·m
lb-ft

1/4

3.7

2.8

4.7

3.5

6

4.5

7.5

5.5

5/16

7.7

5.5

10

7

12

9

15

11

3/8

14

10

17

13

22

16

27

20

7/16

22

16

28

20

35

26

44

32

1/2

33

25

42

31

53

39

67

50

9/16

48

36

60

45

75

56

95

70

5/8

67

50

85

62

105

78

135

100

3/4

120

87

150

110

190

140

240

175

7/8

190

140

240

175

190

140

240

175

1

290

210

360

270

290

210

360

270

1-1/8

470

300

510

375

470

300

510

375

1-1/4

570

425

725

530

570

425

725

530

1-3/8

750

550

950

700

750

550

950

700

1-1/2

1000

725

1250

925

990

725

1250

930



MIF

Grade 5, 5.1, 5.2

Grade 8 or 8.2

Lubricateda

Drya

Lubricateda

Drya

Size
N·m
lb-ft
N·m
lb-ft
N·m
lb-ft
N·m
lb-ft

1/4

9.5

7

12

9

13.5

10

17

12.5

5/16

20

15

25

18

28

21

35

26

3/8

35

26

44

33

50

36

63

46

7/16

55

41

70

52

80

58

100

75

1/2

85

63

110

80

120

90

150

115

9/16

125

90

155

115

175

130

225

160

5/8

170

125

215

160

215

160

300

225

3/4

300

225

375

280

425

310

550

400

7/8

490

360

625

450

700

500

875

650

1

725

540

925

675

1050

750

1300

975

1-1/8

900

675

1150

850

1450

1075

1850

1350

1-1/4

1300

950

1650

1200

2050

1500

2600

1950

1-3/8

1700

1250

2150

1550

2700

2000

3400

2550

1-1/2

2250

1650

2850

2100

3600

2650

4550

3350


DO NOT use these values if a different torque value or tightening procedure is given for a specific application. Torque values listed are for general use only and include a 10% variance. Check tightness of fasteners periodically. DO NOT use air powered wrenches.

Shear bolts are designed to fail under predetermined loads. Always replace shear bolts with identical grade.

Fasteners should be replaced with the same grade. Make sure fasteners threads are clean and that you properly start thread engagement. This will prevent them from failing when tightening.

Tighten toothed or serrated-type lock nuts to the full torque value.

a"Lubricated" means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings. "Dry" means plain or zinc plated without any lubrication.
b"Grade 2" applies for hex cap screws (not hex bolts) up to 152 mm (6-in.) long. "Grade 1" applies for hex cap screws over 152 mm (6-in.) long, and for all other types of bolts and screws of any length.