Bomag 05740812 Thermostat

The Bomag 05740812 Thermostat is a genuine OEM thermostat designed for a wide range of Bomag tandem rollers, the BPR 75/60 D-2 reversible vibratory plate, and the BMP 8500 and BMP 8500 Kubota trench compactors. As a direct OEM replacement, this thermostat matches the original component's operating temperature rating and physical dimensions, ensuring correct engine coolant regulation right out of the box. Compatible models include the BW 80 AD-5, BW 90 AD-5, BW 90 AC-5, BW 100 AD-4, BW 100 AC-4, BW 120 AD-4, BW 120 AC-4, BW 125 AD-4, BW 125 AC-4, BW 115 AD-3, BW 115 AC-3, BW 131 AD-2, BW 131 ACW-2, BW 131 AD-3, BW 131 ACW-3, and additional BW-series variants. Sourcing part number 05740812 directly through DHS Equipment means you receive an authentic Bomag component backed by OEM manufacturing standards.

Key Features

• OEM-Calibrated Opening Temperature — manufactured to the exact coolant-activation threshold specified for these Bomag engines, so the cooling system cycles correctly under working loads
• Drop-In Fitment — matches the original housing seat, seal diameter, and bypass port geometry for a straightforward swap with no machining or adapters
• Broad Bomag Coverage — fits the BPR 75/60 D-2 reversible vibratory plate, BMP 8500 and BMP 8500 Kubota trench compactors, and an extensive range of BW-series tandem rollers including the BW 80 AD-5, BW 90 AD-5, BW 100 AD-4, BW 120 AD-4, BW 125 AD-4, BW 100 SCC-5, BW 100 SC-5, BW 90 SC-5, BW 90 SL-5, BW 90 SL-5 CC, BW 100 ADM-5, BW 100 ACM-5, BW 100 SLM-5, and more
• Engine Temperature Stability — a correctly functioning thermostat keeps the engine in its optimal operating range, protecting against both overheating and the accelerated wear caused by running chronically cold
• Genuine Bomag OEM Part — produced under Bomag's own quality program, so the materials, wax-element formulation, and dimensional tolerances are identical to what left the factory originally

The thermostat is a temperature-sensitive valve that sits in the engine's cooling circuit and controls when coolant is allowed to flow through the radiator. When the engine is cold, the thermostat stays closed and circulates coolant in a short loop so the engine reaches operating temperature quickly. Once the coolant hits the designed opening point, the valve opens and hot coolant is routed to the radiator to be cooled before returning to the engine. A thermostat that sticks closed will cause rapid overheating; one that sticks open will keep the engine running too cool, leading to poor fuel combustion, increased wear, and higher emissions. Replacing a failed thermostat with a genuine OEM unit like the Bomag 05740812 restores precise temperature control and protects the engine across long compaction shifts.

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

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.