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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-254


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 47.25 lb

UPC Number

N/A 40214

NEMA Frame Motor Size

N/A 184T, 213T, 215T, 254T

Dimensional Data

Dimension A

N/A 28.625 in

Dimension B

N/A 23.625 in600.08 mm

Dimension C

N/A 10.375 in263.53 mm

Dimension D

N/A 14.000 in

Dimension E

N/A 10.000 in254.00 mm

Dimension E1

N/A 8.500 in215.90 mm

Dimension E2

N/A 7.500 in190.50 mm

Min. Dimension F

N/A 7.953 in202.01 mm

Max. Dimension F

N/A 8.453 in214.71 mm

Min. Dimension F1

N/A 5.375 in136.53 mm

Max. Dimension F1

N/A 7.250 in184.15 mm

Dimension G

N/A 26.000 in660.40 mm

Dimension H

N/A 0.563 in14.29 mm

Dimension H1

N/A 0.438 in11.11 mm

Dimension I

N/A 2.125 in53.98 mm

Dimension J

N/A 2.250 in57.15 mm

Dimension K

N/A 3.219 in81.76 mm

Dimension L

N/A 0.188 in4.76 mm

Dimension M

N/A 4.500 in114.30 mm

Dimension N

N/A 1.813 in46.04 mm

Dimension O

N/A 0.516 in13.10 mm

Dimension P

N/A 2.500 in63.50 mm

Dimension Q

N/A 2.313 in58.74 mm

Dimension S

N/A 13.000 in330.20 mm

Dimension T

N/A 7.125 in

Dimension U

N/A 2.500 in63.50 mm

Dimension W

N/A 12.750 in323.85 mm

Dimension X

N/A 21.000 in533.40 mm

Diameter (Dimension Y)

N/A 1.250 in

Diamenter (Dimension Z)

N/A 1-5

Cubic inches

N/A 2855.34375 in³

Performance Data

Travel Distance

N/A 11 1/4 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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