Horse Power Rating Chart
Double Stage Reduction Crane Duty Helical Gearboxes-HB Type

SIZE

HB-250

HB-350

RPM

960

720

960

720

Duty

I

II

III

IV

I

II

III

IV

I

II

III

IV

I

II

III

IV

R
A
T
I
O

8.23

24.4

17

12.7

9.5

19

12.7

10.6

7.4

55.5

39

30.4

21

43

30.4

24.2

16.8

10.35

20.1

13.8

10.6

7.4

16

10.6

8.5

6.35

46

32.6

25.2

16.8

37

25.2

20

13.7

12.64

17

11.7

9.6

6.4

13.8

9.5

7.4

5.3

39

27.4

21

14.7

31.5

22

16.8

11.6

15.74

14.9

9.5

8.5

5.3

10.6

7.4

6.4

4.3

33.6

23.1

17.9

12.6

25.2

17.9

13.7

9.5

20.49

11.7

8.5

6.4

4.3

8.5

6.4

4.3

3.2

26.3

18.9

13.7

9.5

21

14.7

10.5

7.4

23.34

9.6

7.4

5.3

3.2

7.4

5.3

4.3

3.2

23.1

16.8

12.6

8.4

18.9

12.6

9.5

6.3

31.50

7.4

5.3

4.3

3.2

6.4

4.3

3.2

2.1

17.8

12.6

9.5

6.3

13.7

9.5

7.4

5.3

40.17

6.4

4.3

3.2

2.1

4.3

3.2

2.1

2.1

14.7

10.5

7.4

5.3

10.5

7.4

5.3

4.3

48.57

5.3

3.2

2.1

2.1

4.3

2.1

2.1

1.1

12.6

8.4

6.3

4.3

9.5

6.3

4.3

3.2

SIZE

HB-400

HB-500

RPM

960

720

960

720

Duty

I

II

III

IV

I

II

III

IV

I

II

III

IV

I

II

III

IV

R
A
T
I
O

8.23

75

54

41.5

33

60.5

42.5

34

26.5

184

126

96

65

147

102

75.5

52

10.35

66

45.5

37

28.6

53

37

29.6

22.2

153

107

76.5

52.5

124

86

62

41

12.64

57.2

39.2

31.8

24.4

46.5

31.8

25.4

19.1

129

92

64

43.5

104

71

51

35

15.74

49.8

34

26.5

19.1

39.2

26.5

21.2

14.8

111

76

49

34

84

59

42

29

20.49

44.5

30.8

24.4

17

35

24.4

19.1

12.7

78

55

37

25

62

43

29

20

23.34

39

27

21.2

14.8

32

21.2

17

11.7

72

50

34

23.5

57

40

27

18.5

31.50

30.4

22

14.7

10.6

23.2

17

11.7

8.5

61

42

29

20

47

34

23

16

40.17

25.5

18

12.7

8.5

21.2

14.7

9.5

7.4

48

34

22

15

37

25

17

11.6

48.57

23.4

15.9

10.6

7.4

18

11.7

8.5

5.3

41

28.5

18

13

31.5

22

14

9.5

SIZE

HB-650

HB-750

RPM

960

720

960

720

Duty

I

II

III

IV

I

II

III

IV

I

II

III

IV

I

II

III

IV

R
A
T
I
O

8.23

358

252

196

143

274

201

160

113

610

435

302

204

485

340

250

161

10.35

306

210

171

118

244

170

135

92

510

356

238

165

410

284

193

152

12.64

263

181

144

96

208

145

114

77

432

306

203

136

342

238

159

109

15.74

221

150

118

78

175

120

93

62

370

255

167

116

279

197

134

93

20.49

199

136

90

60

156

108

71

49

292

195

129

85

228

155

100

69

23.34

181

123

81

54

142

97

63

44

264

176

119

78

208

140

90

63

31.50

138

95

62

42

108

77

49

34

206

142

92

63

159

111

74

51

40.17

113

78

48

34

88

61

38

26

163

109

68

48

125

86

53

38

48.57

95

65

41

28.5

73

49

31.5

22

135

92

58

41

104

74

44

32

SIZE

HB-850

HB-1000

RPM

960

720

960

720

Duty

I

II

III

IV

I

II

III

IV

I

II

III

IV

I

II

III

IV

R
A
T
I
O

8.23

1025

702

468

330

815

570

413

285

2050

1367

1050

739

1630

1086

835

588

10.35

857

587

391

270

689

478

319

220

1714

1142

878

622

1378

918

706

493

12.64

726

497

331

233

574

395

255

180

1452

968

691

490

1148

765

546

382

15.74

622

426

284

200

469

323

215

153

1244

802

572

402

938

625

446

314

20.49

426

292

195

139

333

228

152

108

852

591

422

297

666

475

339

240

23.34

385

269

179

128

304

211

136

97

770

531

379

267

608

419

299

210

31.50

301

206

137

98

232

159

106

76

602

415

296

208

462

318

220

155

40.17

238

163

109

79

182

125

83

60

476

328

234

165

366

250

173

119

48.57

197

135

90

65

152

104

69

50

394

271

193

136

307

211

146

102