A-B1091179MA-AI IDLER PULLEY-B'SIDE

One New Aftermarket Replacement Backside Idler Pulley for Murray / Fits Briggs & Fits Stratton Lawn Tractors

This flat backside idler pulley (B'Side) serves as the engine-to-transmission drive belt tensioner on Murray riding lawn tractors with 38, 40, and 42-inch decks. It maintains proper belt tension in the drive system, ensuring smooth power transfer and reliable mower operation. This aftermarket replacement fits Murray, Scotts, and Ranch King lawn tractors and is a direct replacement for Murray OEM part numbers 091179MA and 421409MA.

Specifications

• Outer Diameter: 3.33 in.
• Inner Diameter: 0.50 in.
• Height: 1.00 in.
• Style: Flat idler pulley
• Application: Engine-to-transmission drive belt (backside/B'Side)

Compatible Models

Murray 38-Inch Lawn Tractors: 38500A, 38500B, 38500x30A, 38500x83A, 38500x192A, 38500x192B, 38501x50A, 38501x50B, 38502x51A, 38502x51B, 38502x66A, 38502x67A, 38502x98A, 38504A, 38504x25A, 38506x4A, 38506x199A, 38510x50A, 38510x59A, 38514x95A, 38515x83A, 38515x92A, 38515x92B, 38516x29A, 38516x52A, 38602x66F, 38602x70H, 38602x70J, 38623x5C, 38623x5D, 38632x66B, 38633x92A, 38633x92B, 38702x7A, 38702x7B, 38702x8D, 38702x8E, 38702x20D, 38702x20E, 38705A, 38705x5A, 38705x5B, 38705x30A, 38706A, 38706x99A, 38706x99B, 38710A, 38711x20A, 38711x29A, 38711x52A, 38711x66A, 38711x67A, 38711x73A, 38711x96A, 38712x53A, 38712x66A, 38713x71A, 38714x51A, 38715A, 38715x82A, 38716x82A

Murray 40-Inch Lawn Tractors: 40320x88, 40501x30A, 40502x50A, 40502x50B, 40503x88A, 40503x88B, 40504x92A, 40505x95A, 40507x8B, 40530x51A, 40530x51B, 40530x51C, 40530x83A, 40530x92A, 40530x192A, 40531x50A, 40531x59A, 40536x4A, 40538A, 40541A, 40541C, 40541x30A, 40542A, 40542B, 40542C, 40542D, 40614B, 40614C, 40706A, 40706B, 40708C, 40717A, 40910B

Murray 42-Inch Lawn Tractors: 42500A, 42500x30A

Murray Lawn Tractors (Series): 31621x70G, 31720x11B, 31720x11C, 31720x20E, 31720x51A, 31720x51B, 31720x51C, 31721x88A, 31722x95A, 39711x97A

Ranch King: 38715x82A, 38716x82A (38-inch); 42500x82A (42-inch)

Scotts 38-Inch: 38702x7A, 38702x7B, 38702x8D, 38702x8E

Scotts 40-Inch: 40507x8B, 40708x8A, 40708x8B

Replaces Part Number(s):

091179MA, 91179MA, 91179, 091179, 0091179, 421409MA, 421409

Aftermarket Interchange Numbers

Hayter MY91179, Fits Stens 280-499, 8TEN 810-CID2269L

New aftermarket replacement part - not remanufactured, not used.