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Monster GSM25 Pumphead - NEMA 56C Frame
About
A direct replacement pumphead engineered to mount to standard NEMA 56C motors. Built for fast, quiet, and reliable heavy oil transfer.
- Flow Rate vs. RPM: 12 GPM @ 1800 RPM | 20 GPM @ 2850 RPM | 25 GPM @ 3450 RPM.
- Direct Fit: Flanged for NEMA 56C standard electric motors.
- Shaft Size: Features a 14mm keyed shaft (requires appropriate coupler for your motor).
- Smooth Operation: Large displacement helical-cut steel gears for fast and quiet operation.
- Ready to Plumb: 1" NPT ports (Includes two 1.25" hose barbs).
The ultimate cast-iron replacement pumphead. Engineered to move heavy gear oils, waste motor oil, and diesel, built specifically to mount to standard NEMA 56C electric motors.
In a true heavy-duty fluid transfer system, your electric motor is the expensive workhorse that should last for years, while the pumphead inevitably takes the abuse of moving heavy, abrasive oils. When your pumphead eventually wears out, there is no need to buy an entire new system. The W2083 is a cost-effective, direct-replacement pumphead designed for close-coupled pumps with NEMA 56C motors, getting you back to pumping at peak efficiency in minutes.
Key Features & Benefits
- Scalable Performance: The flow rate of this pumphead scales perfectly with your motor's speed. Pair it with a 3450 RPM motor for high-speed 25 GPM transfer, a 2850 RPM motor for 20 GPM, or an 1800 RPM motor for high-torque 12 GPM transfer.
- Fast & Quiet Operation: Equipped with large displacement, helical-cut steel gears that provide a nearly pulseless flow, drastically reducing vibration and noise during heavy transfer jobs.
- Universal Fit: Designed as a direct bolt-on fit for NEMA 56C standard electric motors. The pumphead features a 14mm keyed shaft.
- Self-Priming: Creates strong suction lift right out of the box, saving you time and hassle.
Technical Specifications
| Feature | Specification |
|---|---|
| Oil Viscosity | Fuel Oil to Heavy Gear Oil (including WMO, WVO, Diesel) |
| Flow Rate vs. RPM | 12 GPM @ 1800 RPM 20 GPM @ 2850 RPM (50Hz) 25 GPM @ 3450 RPM |
| Pumphead Material | Heavy-Duty Cast Iron |
| Gears | Large Displacement Helical-Cut Steel |
| Shaft Size | 14mm Keyed Shaft |
| Port Size | 1" NPT Inlet / Outlet |
| Motor Compatibility | NEMA 56C Frame |
What’s Included in the Box
- W2083 Cast-Iron Gear Pumphead (NEMA 56C Mount)
- Two (2) 1" NPT to 1.25" Hose Barbs
Note: Motor, shaft coupler, handle, base, and hoses are NOT included.
Motor Sizing & Fluid Viscosity Guide
Thicker oils require significantly more torque to move, especially at higher speeds. Pairing this pumphead with the correct motor is critical to prevent your motor from overheating. Use the guidelines below to size your custom build:
| Motor Speed (Flow Rate) | Fluid Viscosity / Type | Minimum HP Required |
|---|---|---|
| 1800 RPM (12 GPM) | Cold Motor Oil, Waste Oil (WMO) | 3/4 HP |
| 3450 RPM (25 GPM) | Light Oils (Diesel, Warm ATF, Hydraulic) | 3/4 HP |
| 3450 RPM (25 GPM) | Heavier Oils (Cold Motor Oil, Heavy Gear Oil) | 1 HP to 2 HP |
⚠ Important Operating Notes
To ensure the maximum lifespan of your equipment, please observe the following guidelines:
- Oil Lubricated Only: The internal gears rely on the fluid you are pumping for lubrication. THIS PUMP WILL NOT WORK WITH WATER. Do not pump water, gasoline, or highly flammable solvents.
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