The Bomag 31781903 Water Pump is a genuine OEM component designed for BC 771 RB and BC 771 RS refuse and landfill compactors. Sourced directly from Bomag, this water pump carries the same specifications as the unit installed at the factory, ensuring a verified fit for these machines. If your BC 771 RB or BC 771 RS is running hot or showing signs of cooling system trouble, replacing the water pump with an authentic Bomag part number 31781903 is the correct first step toward restoring proper thermal management.
Key Features
- Genuine OEM Cooling Integrity — manufactured to Bomag's exact impeller geometry and seal tolerances, delivering the correct coolant flow rate for the BC 771 RB and BC 771 RS engine cooling system
- Direct-Mount Replacement — matches the original bolt pattern, inlet and outlet dimensions, and shaft size so this water pump installs in place of the failed unit without modification
- Confirmed Fitment — verified for BC 771 RB and BC 771 RS refuse and landfill compactors, covering both the rubber-belt and steel-belt compaction variants in the BC 771 family
- Sustained Engine Protection — a properly functioning water pump maintains consistent coolant circulation throughout the engine, preventing overheating that can lead to head gasket failure or accelerated wear on compactor engines working in high-heat landfill environments
- Thermal Safety Assurance — a failing water pump on a refuse compactor operating in dense, high-friction conditions can cause rapid temperature spikes; replacing it promptly with part number 31781903 keeps the cooling circuit operating within safe limits
The water pump is the heart of the engine's liquid cooling system — it circulates coolant from the radiator through the engine block and cylinder head, drawing away heat generated during combustion. On heavy-duty refuse and landfill compactors like the BC 771 RB and BC 771 RS, where engines operate under sustained load in demanding site conditions, the water pump is under constant stress. When the pump's impeller wears, its seal leaks, or its bearing fails, coolant flow drops and engine temperatures climb quickly, risking serious internal engine damage. Replacing a worn pump with a correctly specified OEM unit restores full coolant circulation and protects the engine from heat-related failure.
Part Details
| Part Number | 31781903 |
|---|---|
| Brand | Bomag |
| Part Type | Genuine OEM |
| Description | Water Pump |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Refuse / Landfill Compactor | BC 771 RB | 00817403 |
| Refuse / Landfill Compactor | BC 771 RS | 00817405 |
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.
