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Adjustable Motor Bases

Sliding and Tilting Bases
    It is necessary to change the distance between the motor and driven shaft in order to change speed with an adjustable center drive. The best way to do this is with an adjustable motor base. Lovejoy offers four basic types of motor bases to satisfy requirements of space, convenience, interchangeability, motor frame size, and economy.
Sliding “SMB” Type

Models: SMB143, SMB184, and SMB254
    SMB motor bases are extremely low profile and made of strong, lightweight steel, plated for protection against rust and corrosion. A folding knurled adjusting handle replaces the common round hand wheel to offer easy speed adjustment with minimum effort and no tools. Adjustable maximum and minimum speed stops are included. The adjusting handle is easily removed for the addition of a sprocket or universal joint to adapt to existing control methods.
    For remote control in hazardous or inconvenient locations, Lovejoy offers electric servo motor controlled bases in the SMB style, both chain-driven (MRC) and direct coupled (ERC). Both types come complete with motor, control, and wiring diagram.
Unit of Measure





N/A SMB-143


N/A Pump Mounting Bracket


N/A Steel


N/A Adjustable Center VSP Drive

Model Compatibility

N/A for NEMA Motor Frame Sizes


N/A One Adjustable Motor Base


N/A 9.00 lb

UPC Number

N/A 40212

NEMA Frame Motor Size

N/A 48, 56, 143T

Dimensional Data

Dimension A

N/A 15.750 in

Dimension B

N/A 12.625 in320.68 mm

Dimension C

N/A 8.000 in203.20 mm

Dimension D

N/A 8.750 in

Dimension E

N/A 5.500 in139.70 mm

Dimension E1

N/A 4.250 in107.95 mm

Min. Dimension F

N/A 1.656 in42.07 mm

Max. Dimension F

N/A 4.469 in113.51 mm

Dimension G

N/A 13.875 in352.43 mm

Dimension H1

N/A 0.406 in10.32 mm

Dimension I

N/A 1.875 in47.63 mm

Dimension J

N/A 1.938 in49.21 mm

Dimension K

N/A 2.500 in63.50 mm

Dimension L

N/A 0.109 in2.78 mm

Dimension M

N/A 3.500 in88.90 mm

Dimension N

N/A 1.375 in34.93 mm

Dimension O

N/A 0.406 in10.32 mm

Dimension P

N/A 1.875 in47.63 mm

Dimension Q

N/A 1.406 in35.72 mm

Dimension S

N/A 7.000 in177.80 mm

Dimension T

N/A 5.125 in

Dimension U

N/A 1.250 in31.75 mm

Dimension W

N/A 7.250 in184.15 mm

Dimension X

N/A 11.375 in288.93 mm

Diameter (Dimension Y)

N/A 0.625 in

Diamenter (Dimension Z)

N/A 1/2-13

Cubic inches

N/A 706.28906 in³

Performance Data

Travel Distance

N/A 5 5/8 in



  • Three sizes available to fit NEMA motor frames from fractional through 15 horsepower
  • Simple installation provided by a one-piece motor mounting plate
  • Best possible belt alignment maintained because the motor shaft remains perpendicular to the plane of adjustment
  • Slotted for standard NEMA motor frame mounting, but can be drilled for special mounting sizes to offer flexibility of design
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