The Bomag 05574284 Diaphragm Cylinder is a genuine OEM component designed for Bomag BW 24 RH, BW 25 RH, BW 27 RH, BW 27 RH-4i, BW 27 RH-4i BC pneumatic tyred rollers, and BW 177 PDH 5 single drum rollers. Sourced directly from Bomag, this diaphragm cylinder meets the exact specifications of the original part it replaces. Confirm fitment against part number 05574284 before ordering to ensure a correct, direct match for your machine.
Key Features
- Genuine OEM Construction — manufactured to Bomag's exact material and dimensional specifications, delivering the precise actuation force and seal integrity this braking application demands
- Direct Drop-In Replacement — engineered to match the original mounting points and port connections on compatible Bomag rollers, so installation follows standard service procedures
- Broad Model Coverage — fits BW 24 RH, BW 25 RH, BW 27 RH, BW 27 RH-4i, and BW 27 RH-4i BC pneumatic tyred rollers, as well as the BW 177 PDH 5 single drum roller
- Consistent Braking Response — a properly functioning diaphragm cylinder maintains predictable, even brake actuation; a worn or leaking unit can cause spongy or uneven braking across the roller's axle
- Safety-Critical Component — as a core element of the braking system, using a genuine OEM diaphragm cylinder helps ensure the roller responds correctly to operator brake inputs, supporting safe operation on grade and on site
A diaphragm cylinder uses pressurized air acting against a flexible diaphragm to generate the mechanical force needed to engage the brake assembly. When the operator applies the brake, air pressure pushes the diaphragm outward against a push rod, which in turn actuates the brake mechanism. Over time, the diaphragm can develop cracks, harden, or lose elasticity, resulting in reduced braking force, air leaks, or sluggish brake response — all of which compromise control of the roller. Replacing a degraded diaphragm cylinder with a genuine Bomag part restores the intended actuation stroke and keeps the braking system operating as designed.
Part Details
| Part Number | 05574284 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Diaphragm Cylinder |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Pneumatic Tyred Roller | BW 24 RH | 00817755, 00818457, 00818949, 00818951, 00824405 |
| Pneumatic Tyred Roller | BW 27 RH | 00817757, 00818315, 00818953, 00818997, 00824407 |
| Pneumatic Tyred Roller | BW24RH | 00818279, 00818691 |
| Single Drum Roller | BW177PDH 5 | 00818281 |
| Pneumatic Tyred Roller | BW 25 RH | 00818321 |
| Pneumatic Tyred Roller | BW 27 RH-4i | 00824131, 00824409 |
| Pneumatic Tyred Roller | BW 27 RH-4i BC | 00824723 |
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
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
