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One-Side Moveable
1/3 Through 5 HP, “A” and “B” Belts
    The Econoline Pulley series provides reliable variable speed service with a proven design at an economical cost. The wide selection of models feature compact size and reliability, which make them ideal for both adjustable and fixed center drives in all types of applications using classical “A” and “B” (or 4L and 5L) section drive belts.
    Spring-loaded pulleys are through-bored for all types of shaft mounting arrangements. The exposed spring design allows for a cooler running pulley and permits easy cleaning. Complete spring enclosures are available as an option on some models.
Belt Selection
    Econoline pulleys are designed specifically for “A” and “B” section drive belts, though they can also be used with “4L” and “5L” belts if necessary. Cogged, raw-edge belts have a definite advantage over wrapped types because they readily form around small pitch diameters, and provide a better arc of contact and provide best possible transmission of torque. If a “slip clutching” effect is desirable to protect machinery in the event of overload, a wrapped belt is recommended.
Adjustable Center Drives
    An adjustable center drive using the Econoline variable speed driver pulley is an economical, efficient solution for many drive requirements. The typical adjustable center drive consists of a spring-loaded pulley mounted on the motor shaft, a companion sheave on the driven shaft, an adjustable motor base, and a belt. A wide range of sizes and horsepower ratings are available from the Econoline series to fit the system requirements.
    Standard “A” and “B” companion sheaves are recommended for use with Econoline adjustable center drives. Since many Econoline pulleys have only one moveable flange and the companion sheaves are grooved, some misalignment of the belt can be expected and is acceptable for most drives. To minimize this misalignment, the belt should be aligned with the driven sheave when the belt is in the median pitch diameter range of the variable speed pulley, or in the range of principle operation. Due to the minimal bottom contact area of “A” and “B” belts, flat driven sheaves are NOT recommended.
Fixed Center Drives
    Econoline fixed center drives utilize the same type of spring-loaded pulley as an adjustable center drive, only it is normally mounted on the driven shaft. The driver pulley is of similar size and construction, but it is manually adjustable. A fixed center drive offers greater driven speed range in a more compact space. There are two types of controllable pulleys: the M type with a hand wheel and built-in adjusting device, and the MLA type that uses an external control. The MLA type pulley can be used with the Lovejoy #76 Control Stand (see page VSD-21) or some other type of linear controller.
    A fixed center drive consists of four component parts: the adjustable driver pulley, the spring-loaded driven pulley, the belt, and a Model 501 Torque Arm Bracket. This bracket prevents the handwheel from spinning so speed can be changed while the drive is running (see drawing on page VSD-21). The 501 Torque Arm Bracket is NOT needed with the MLA type pulley. A wide variety of drive packages are available from the Econoline Series to suit your needs. Different diameter pulleys can be paired together to achieve a variety of driven speed ranges, and all sizes of driven spring- loaded pulleys are available in a variety of horsepower ratings.
Unit of Measure

Specifications

Description 

 N/A 7050-3/4-PULLEY

Drive Type

 N/A Adjustable Center - Driver

Belt Size

 N/A Any B Type

Belt Type

 N/A B

Model

 N/A 7050

Ratio

 N/A 1.80:1

Weight

 N/A 8.00 lb

UPC Number

 N/A 27864

Dimensional Data

Bore Diameter 

 N/A 3/4 in

Keyway Size 

 N/A 3/16 x 3/32 in

Outside Diameter

 N/A 7.000 in

Max. Pitch Diameter (Dimension PD)

 N/A 6.650 in

Min. Pitch Diameter (Dimension PD)

 N/A 3.690 in

Overall Length

 N/A 4.130 in

Dimension D1

 N/A 3.130 in79.50 mm

Dimension D2

 N/A 2.880 in73.15 mm

Dimension L1

 N/A 0.950 in24.13 mm

Dimension L2

 N/A 1.190 in30.23 mm

Total Travel Distance

 N/A 2.200 in55.88 mm

Cubic inches

 N/A 202.37000 in³

Performance Data

Torque Capacity

 N/A 180.00 in·lb

Motor Power at 1,150 rpm

 N/A 3.00 hp

Motor Power at 1,750 rpm

 N/A 5.00 hp
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