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Salient Features

Hardened and profile ground gears

Unicast case with 3-point mounting

Dry well arrangement

Pumpless lubrication

Greaves GA series parallel shaft vertical gear drives in

triple reduction are intended to satisfy characteristic

requirements and conditions encountered in Aerator

application. The series covering sizes from 112 to 250

with ratio range of 25.6 : 1 to 42.5 : 1 in triple stage are

exclusively meant for Aerator drives with essential

features like uni-cast case, 3-point mounting, pumpless

lubrication and drywell arrangement. The units are

supplied with suitable motor mounting adaptors, flexible

coupling on input and rigid coupling on output (optional)

corresponding to specific requirements. This catalogue

contains specifications, dimensions and ratings for

selection of standard gear drives against usual

applications. Our engineers will be pleased to assist in

case of unusual conditions attracting special

requirements. GR

EA

VE

S

GA-Series Aerator Drive Gearboxes

Bearings :

Taper roller bearings from major manufacturers are usedthroughout. These bearings are of ample capacity to supportcombined thrust and radial loads.Optional Feature :

Rigid coupling on output extension may be provided withsuitable flange dimensions as per customers specificrequirement.Painting :

Casting surfaces are painted with redoxide primer bothinternally and externally. External cast faces are finallyfinished with alkyde semi-gloss blue paint, which is resistantto dilute acids and alkalis, oils and solvents, sea water andtemperatures upto 140oC.Preservation / Protection :

Greaves Aerator gear units are despatched without oil. Priorto despatch they are test run with a rust preventative oilassuming adequate protection to internal parts for a period of6 months, covering normal transport and covered storage.


SALIENT FEATURE

Case :

Single piece grey cast iron casing is of rigid construction withnecessary reinforcements. Provided with easily accessibleservice ports they are suitably designed on CAD work stationsto absorb external loads and to dampen noise and vibration.The three point mounting facilitates in achieving alignment.Helical Gears :

These gears are machined from high quality alloy case-hardening steel, which are individually flank ground toprecision grade accuracy. Case hardened surface with softercore provides improved wear resistance and fatigue strength.Shafting :

Input and intermediate shafts integral with pinions aremachined from case-hardening alloy steel. Direct hardeningsteel is used in case of output shaft. The cylindrical seats forbearings, wheel, seal, coupling are finished by precisiongrinding. These are also designed to accommodate externaloverhung loads and stresses, as appropriate. Single lip oilseals are provided on plunge ground surfaces to arrest oilleakage and dust entry. Specific requirement towards flangefitment dimensions must be addressed during placement oforder.Lubrication :

The top bearings are grease lubricated with suitable retainerplates and external nipple provided on covers. The bottomoutput bearing placed within the drywell is also greaselubricated. Other bottom bearings are immersed in sump oil.The gear meshes are lubricated by oil splash.

NOTE :

As improvements in design are being continuously made, this specification is not to be regarded as bindingand is subject to alterations without notice.

1.0 Selection from mechanical rating :

1.1 Gearbox ratio = Input speed / output speed

1.2 Model ratings as listed in rating chart correspond to

maximum mechanical capacities at 1500 rpm input

against respective ratios.

1.3 Service power rating

= Mechanical Rating (from table) / service factor *

(* minimum service factor of 2.0 is

recommended for helical gear drives under

Aerator application)

1.4 Select a suitable model from the table which

represents a ratio closest to the desired one

and a service power rating that meets or

exceeds the motor power at 1500 rpm.

2.0 Check for thermal rating :

2.1 Thermal ratings are given for gearboxes without

additional cooling.

2.2 Determine the thermal service factor from table 1.

2.3 Calculate the required thermal power

capacity (Pt), when

Pt = absorbed power/thermal service factor

2.4 Check the model selected mechanically under clause

1.4 which should have a thermal rating (as tabled)

equaling/exceeding the required capacity Pt. If not, go

for the next higher size.

3.0 Check for bending moment :

3.1 Calculate the actual bending moment experienced by

the gearbox output shaft where,

Bending moment (kNm)

absorbed power (kW)x 9.5 x L (m)

=

shaft speed x 0.75 R (m)

3.2 Check the bending moment value calculated under

clause 3.1 against the capacity limited by shaft stress

(ref. Table 2). The actual value should be within the

table figure to make the unit suitable for supporting a

paddle directly coupled to the gearbox output shaft

and for accepting the bending moment generated

thereby.


SELECTION PROCEDURE

Table 2

Bending Moment Capacity (kNm)

Allowable Bending Moment at output shaft

lower bearing, limited by shaft stress

Unit Size

112 125 140 160 180 200 225 250

2.3 3.0 4.1 5.8 8.4 12.0 16.8 22.0

Unit Size Nominal

Ratio

Input

speed

rpm

Nominal

output

rpm 112 125 140 160 180 200 225 250

25.6 1500 58.6 11.1 15.4 22.1 34.1 49.8 63.8 86.9 125

28.4 1500 52.8 10.1 14.2 20.9 29.8 45.4 62.3 84.0 123

31.4 1500 47.8 8.6 11.9 17.1 26.5 41.2 53.1 74.5 109

34.7 1500 43.2 7.7 10.7 16.7 24.5 38.1 49.4 69.7 102

38.4 1500 39.1 7.0 9.6 14.8 22.4 33.5 48.5 63.0 93.9

42.5 1500 35.3 6.3 8.6 13.2 20.0 30.8 41.2 57.0 85.4

Triple Reduction Units - Vertical Parallel Shafts - Mechanical & Thermal Capacity (kW)

MECHANICAL CAPACITIES (kW)

THERMAL CAPACITY (kW)

(Units without fan)


Unit SizeNominal

Ratio

Input

speed

rpm

Nominal

output

rpm 112 125 140 160 180 200 225 250

25.6

to

42.5

1500

58.6

to

35.3

8.5 15.4 25.2 33.3 42.3 50 63 75

Table 1 Thermal Service Factor(Gearboxes without additional cooling)

Running Time in any hourAmbientTemperature

OC 100%

80% 60% 40% 20%

10 1.12 1.34 1.57 1.79 2.05

20 1.00 1.20 1.40 1.60 1.80

30 0.88 1.06 1.23 1.41 1.58

40 0.75 0.90 1.05 1.20 1.35

50 0.63 0.76 0.88 1.01 1.13

RECOMMENDED LUBRICANT

ISO VG 320

Brand GradeBalmer Lawrie Protomac SP 320

Bharat Petrolium Amocam 320

Castrol Alpha SP 320

Gulf Harmony HD 320

Hindustan Petrolium Parthan 320

Indian Oil Servomesh SP 320

Veedol Apreslube 320

Approximate Weight & Oil Capacity

Unit Size Net Wt. (Kg.)

Gross Wt. (Kg.)

Oil Qty. (litre)

GA 112 200 230 12

GA 125 245 280 14

GA 140 290 330 16

GA 160 310 360 18

GA 180 330 380 22

GA 200 400 460 25

GA 225 520 600 30

GA 250 650 750 36

Principal Dimensions

(Unless specified otherwise all dimensions are in mm)

SIZE A A1 B C D F F1 G H J L L1 M M1 N GA-112 112 263 372 120 200 112 70 225 85 120 490 16 417 M6 165 GA-125 125 286 406 135 220 125 80 260 95 135 550 16 456 M6 185 GA-140 140 320 470 150 250 140 90 320 105 145 610 16 525 M6 205 GA-160 160 362 532 175 300 160 100 348 115 165 720 16 592 M6 235 GA-180 180 405 585 195 320 175 100 367 145 175 760 16 645 M6 255 GA-200 200 452 680 215 350 185 120 447 155 185 870 18 765 M8 300 GA-225 225 510 750 240 400 205 140 394 170 205 970 18 835 M8 325 GA-250 250 570 800 270 425 220 150 483 185 220 1020 32 900 M16 370

SIZE R S T d E d1 K T1 T2 Z Z1 GA-112 3 40 10 50.018

50.002

200 18.008

17.997

40 20.500

20.400

53.500

53.300

6.000

5.964

14.000

13.957

GA-125 3 45 10 55.030 55.011

210 18.008

17.997

40 20.500

20.400

59.000

58.800

6.000

5.964

16.000

15.957

GA-140 3 50 15 70.030 70.011

240 19.009

18.996

40 21.500

21.400

74.500

74.3000

6.000

5.964

20.000

19.948

GA-160 3 56 15 75.030 75.011

325 22.009

21.996

50 24.500

24.400

79.500

79.300

6.000

5.964

20.000

19.948

GA-180 3 56 20 85.035 85.013

340 25.009

24.996

55 28.000

27.800

90.000

89.800

8.000

7.964

22.000

21.948

GA-200 3 57 20 90.035 90.013

340 28.009

27.996

60 31.000

30.800

95.000

94.800

8.000

7.964

25.000

24.948

GA-225 3 57 25 100.035 100.013

380 32.018

32.002

60 35.000

34.800

106.000

105.800

10.000

9.964

28.000

27.948

GA-250 3 65 25 110.035 110.013

380 38.018

38.002

80 41.000

40.800

116.000

115.800

10.000

9.964

28.000

27.948


Unit Size Nominal Ratio 112 125 140 160 180 200 225 250

25.6 25.972 25.392 25.870 25.502 26.320 25.527 26.383 25.946 28.4 28.396 27.762 28.457 28.152 28.318 28.467 28.555 29.278 31.4 31.375 30.793 31.257 31.812 31.600 31.686 32.345 31.449 34.7 35.286 34.632 34.536 35.286 34.853 34.688 35.821 35.634 38.4 39.027 38.304 38.361 39.363 38.606 38.407 39.688 39.037 42.5 43.419 42.614 42.365 43.112 42.404 43.057 43.917 43.192

Exact Ratio

KW FRAME SIZE

d2 d3 d4+ 0.1 0.0

P Q

1.5 90L 200 165 130 4 13

2.2 100L 250 215 180 4 15

3.7 112M 250 215 180 4 15

5.5 132S 300 265 230 4 15

7.5 132M 300 265 230 4 15

9.3 160M 350 300 250 4 18

11 160M 350 300 250 4 18

15 160L 350 300 250 4 18

18.5 180M 350 300 250 4 18

22 180L 350 300 250 4 18

30 200L 400 350 300 4 18

37 225S 450 400 350 4 18

45 225M 450 400 350 4 18

55 250M 550 500 450 8 18

UNIT SIZE

MOTOR FRAME

G UNIT SIZE

MOTOR FRAME

G

132S 245 180L 365

112M 225 180M 365

100L 225 160L 365

112

90L 213

180

160M 365

160M 310 200L 383

132M 260 180L 377

132S 260 180M 377

112M 240

200

160L 377

125

100L 240 225S 430

160M 320 200L 394

132M 270 180L 397

140

132S 270

225

180M 397

180M 348 250M 483

160L 348 225M 470

160M 348 225S 470

160

132M 300

250

200L 422


PART IDENTIFICATION

Item No. Description Qty.01 INPUT PINION WITH SHAFT 0102 1ST STAGE WHEEL 0103 2ND STAGE PINION SHAFT 0104 2ND STAGE WHEEL 0105 FINAL PINION SHAFT 0106 OUTPUT WHEEL 0107 OUTPUT SHAFT 0108 INPUT BEARINGS 0209 1ST INTERMEDIATE BEARINGS 0210 2ND INTERMEDIATE BEARINGS 0211 OUTPUT BEARINGS 0212 INPUT OIL SEAL 0113 OUTPUT OIL SEAL 0114 MOTOR MOUNTING ADAPTOR 0115 INPUT FLEXIBLE COUPLING 0116 OUTPUT RIGID COUPLING (OPTIONAL) 01

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