Description Drive unit has two concentric output drive shafts Used on solids contact and flocculating clarifiers or softeners Rake drive section is a low-speed, high-torque, totally enclosed gear drive with positive overload protection Turbine drive section is a heavy-duty, higher speed, totally enclosed gear drive The drive unit is supported by a bridge completely spanning the tank The drive unit has a central output shaft to drive the rakes Used in industrial, municipal and mining clarifiers and thickeners Typically used on tank sizes from 10 to 100 ft (3 to 30 m) in diameter

Features Forged alloy steel main gears and pinions designed for 20 years of life calculated per AGMA 2001-C95 Precision, four-point-contact main bearing, with a 10-year warranty Rake drive has accurate torque gauge calibrated in ft-lbf, N-m or any units desired Variable speed turbine drive is standard Alarm and cutoff switches and maximum torque limiting via shear pin or pressure relief valve Dry well lubrication on turbine output Designed for minimum maintenance with permanently lubricated rake intermediate gearbox

RAKE TORQUE CAPACITY - BRIDGE-MOUNTED DUAL DRIVE UNITS TURBINE DRIVE POWER1     Model Continuous Maximum Overload Yield Allowable Horsepower Max. Speed rpm      ft-lbf N-m ft-lbf N-m ft-lbf N-m SX-A*-D25 3,000 4,100 6,000 8,200 8,100 11,000 10 56 SX-B*-D25 6,000 8,200 12,000 16,400 16,200 22,000 10 56 SX-C*-D25 10,000 14,000 20,000 28,000 27,000 36,500 10 56 S25-A*-D25 14,000 19,000 28,000 38,000 54,000 73,000 20 56 S34-A*-D34 18,500 25,000 37,000 50,000 120,000 163,000 25 39 S34-B*-D34 27,000 36,500 54,000 73,000 120,000 163,000 25 39 S44-B*-D44 35,000 47,500 70,000 95,000 195,000 264,000 50 29 S44-C*-D44 47,000 64,000 94,000 128,000 195,000 264,000 50 29 S60-C*-D60 65,000 88,000 130,000 176,000 440,000 597,000 75 21 S60-D*-D60 125,000 169,500 250,000 339,000 440,000 597,000 75 21 S44-B*2-D44 70,000 95,000 140,000 190,000 390,000 528,000 50 29 S44-C*2-D44 94,000 128,000 188,000 256,000 390,000 528,000 50 29 S60-C*2-D60 130,000 176,000 260,000 352,000 880,000 1,194,000 75 21 S60-D*2-D60 250,000 339,000 500,000 678,000 880,000 1,194,000 75 21 1 For higher horsepower requirements or higher speed, consult factory. Replace the * with the primary reducer option selected. Continuous: Torque at which main gear will have a life in excess of 20 years at normal operating speeds. Maximum Overload: The maximum safe, short term operating torque. Yield: The structural maximum torque based on the minimum yield strength of the main gear.

SX-D25 Series Dimensions

	Item Description 1 Primary reducer, rake 2 Electric motor, rake 3 Torque gauge box 4 Lift lug 5 Drain plug 6 Turbine pinion 7 Speed reducer, turbine 8 Electric motor, turbine 9 Planetary gearbox, rake 10 Turbine gear-bearing 11 Main housing

Model A Rake Output Flange1 Turbine Output Flange1 Weight      in     mm     lb     kg         SX-A*-D25 7.935     201.5     4" 10" 3,000     1,361         SX-B*-D25 7.935     201.5     4" 10" 3,250     1,477         SX-C*-D25 10.250     260.4     4" with oversized 15/16" dia holes 10" 3,500     1,591         1 Metric flanges are available.     Replace the * with the primary reducer option selected.

SD Series Dimensions

	Item Description 1 Machine frame 2 Main gear-bearing, turbine 3 Pinion, rake 4 Planetary gearbox, rake 5 Torque gauge 6 Primary speed reducer, rake 7 Electric motor, rake 8 Main gear-bearing, rake 9 Electric motor, turbine 10 Primary speed reducer, turbine 11 Pinion, turbine 12 Pinion support bearing, turbine 13 Drive hub, turbine 14 Drive hub, rake

Model A B C D E Rake Flange1 Turbine Flange1 Weight      in  mm  in  mm  in  mm  in  mm  in mm  lb  kg  S25-A*-D 40  1,016  48  1,219  14  356  4  102  8  203  5" 10" 4,600  2,087  S34-A*-D 48  1,219  56  1,422  14.5  368  6  152  10  254  8" 16" 6,800  3,084  S34-B*-D 52  1,321  60  1,524  17.75  451  6  152  10  254  8" 16" 7,800  3,538  S44-B*-D 60  1,524  68  1,727  17.75  451  6  152  10  254  10" 20" 8,400  3,810  S44-C*-D 64  1,626  72  1,829  19.75  502  6  152  10  254  10" 20" 9,000  4,082  S60-C*-D 76  1,930  84  2,134  21  533  8  203  14  356  16" 30" 13,400  6,078  S60-D*-D 80  2,032  88  2,235  26  660  8  203  14  356  16" 30" 15,000  6,804      1 Metric flanges are available.     Replace the * with the primary reducer option selected.

Rake Primary Speed Reducer Options

Turbine Variable Speed Primary Reducer Options

Mechanical type variable speed reducer

The mechanical variable speed reducer is a ring-cone or a disc design. The output speed varies as the pitch-line distance between two rotating components decreases or increases. The speed variation is adjusted by turning a hand-wheel on the reducer. These reducers include a standard NEMA C-frame on both the input and output connections for easy installation and removal. The reducers provide a 5:1 variable speed range.

Electrical type variable speed reducer

The electrical type variable speed is a variable frequency drive (VFD) that controls the output speed of the electric motor. The VFD can be mounted near the drive unit or at a remote location. VFDs provide a clean, maintenance-free, and economical way of attaining variable speed. Standard features include forward and reverse, speed indication, motor overload protection, soft-start, 4-20 mA signal, and monitoring of operating conditions. These reducers provide a 5:1 variable speed range or 10:1 when used with an inverter duty motor.

Hydraulic type variable speed reducer

The hydraulic type variable speed reducer is a stand-alone industrial hydraulic power unit with a variable volume piston pump and hydraulic motor combination for speed reduction. This design is used when the rake primary speed reducer is an H-type design. A screw located on the pump is turned to change the stroke of the pump pistons and vary the amount of oil delivered to the hydraulic motor, thus varying the final output speed of the drive unit. These speed reducers provide a 3:1 variable speed range.