Bomag 05794074 Diaphragm Kit

The Bomag 05794074 Diaphragm Kit is a genuine OEM component designed for Bomag walk-behind light rollers and tandem rollers, including the BW 75 ADL, BW 90 AD, BW 120 AD, BW 135 AD, BW 138 AD, BW 80 AD-2, BW 90 AD-2, BW 100 AC-3, BW 100 AD-3, BW 100 ADM-2, BW 120 AC-3, BW 120 AD-3, BW 125 ACH, BW 125 ADH, BW 135 AC, BW 138 AC, BW 151 AC-2, BW 161 AC-2, BW 164 AC-2, BW 80 ADS, BW 90 AC-2, BW120AD 3, and BW 138-AD. Sourced directly from Bomag, this kit delivers the exact materials, tolerances, and geometry of the original — ensuring a proper seal and correct diaphragm action on first installation. When your fuel system shows signs of irregular fuel delivery or a failed membrane, this kit provides everything needed to restore correct operation across the full range of compatible rollers.

Key Features

• Genuine OEM Diaphragm Material — manufactured to Bomag's original material specification, ensuring the correct flexibility, chemical resistance, and sealing performance for sustained fuel system integrity
• Complete Kit Format — includes all diaphragm components needed for a full service, so technicians have every piece on hand without sourcing individual parts separately
• Direct-Fit Replacement — engineered to the original dimensional profile, allowing this kit to seat and seal correctly without modification in all compatible applications
• Broad Roller Coverage — confirmed fit across Bomag BW-series tandem rollers and the BW 75 ADL walk-behind light roller, including AC, AD, ACH, ADH, ADS, and ADM variants spanning multiple generations
• Restored Fuel Delivery Consistency — a failed or hardened diaphragm causes erratic fuel flow, rough running, and potential stalling; replacing it with this kit brings fuel delivery back to correct, steady operation

A diaphragm kit services the flexible membrane inside a fuel pump or carburetor, which is responsible for drawing and pushing fuel in controlled pulses through the fuel system. Over time, heat, fuel chemistry, and mechanical cycling cause the diaphragm to harden, crack, or lose its flex — leading to poor fuel delivery, hard starting, and uneven engine performance. Replacing the diaphragm with a correctly specified kit restores the sealing and pumping action the fuel system depends on, bringing the engine back to smooth, consistent operation.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

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Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.