Hydra-Cell 112-416 — 40:1 Gearbox for P300 Series Metering Pumps
The Hydra-Cell 112-416 is the OEM-specified 40:1 gear reducer designed exclusively for use with the Wanner Engineering P300 Series metering pump platform. It serves as the mechanical bridge between your drive motor and the pump's crankshaft, stepping down the input shaft speed by a ratio of 40:1 to achieve the slow, precise rotational speeds that accurate chemical metering demands. By reducing pump shaft speed and maintaining proper output torque, this gearbox also allows you to use a smaller, more energy-efficient motor and, when paired with a variable frequency drive (VFD), scale flow within a full 10:1 turndown range without sacrificing the steady-state accuracy that API 675 requires.
What sets the 112-416 apart from generic reducers is its purpose-built integration into the P300 system architecture. The gearbox is a separate, self-contained unit, which prevents cross-contamination between the actuating oil in the pump head and the gear oil in the reducer — a practical advantage in chemical processing, water treatment, and precision dosing environments where fluid integrity is non-negotiable. Whether you're running a single P300 pump or multiplexing multiple heads off one motor and gearbox, the 112-416 delivers the consistent mechanical performance Wanner designed this platform around. It's a direct replacement that keeps your P300 system running at factory-rated performance.
Key Features:
- 40:1 mechanical gear reduction ratio matched to the P300 series crankshaft drive
- Reduces pump shaft speed to enable precise, low-RPM metering operation
- Maintains proper output torque to minimize required motor horsepower
- Compatible with variable frequency drive (VFD) systems for electronic flow adjustment across a 10:1 turndown ratio
- Separate gearbox housing prevents cross-contamination of actuating oil and gear lubricant
- Supports multiplexing configurations — one motor and gearbox can drive multiple P300 pump heads
- Designed to support API 675 standards for steady-state accuracy (±1%), linearity (±3%), and repeatability (±3%)
- Direct OEM replacement part for Wanner Engineering Hydra-Cell P300 series metering pumps
- Part Number: 112-416
Applications:
- Chemical injection and dosing in water and wastewater treatment facilities
- Precision reagent metering in industrial process systems
- Oil and gas chemical injection applications requiring controlled-volume delivery
- Polymer feed systems and corrosion inhibitor dosing
- Food and beverage additive metering where seal-less, leak-free operation is required
- Pharmaceutical and personal care product manufacturing process lines
- Pulp and paper chemical treatment systems
- Mining and mineral processing reagent addition
Specifications:
- Part Number: 112-416
- Compatible Pump Series: Hydra-Cell P300 Series Metering Pumps
- Gear Ratio: 40:1
- Function: Mechanical shaft speed reduction with torque maintenance
- Drive Compatibility: Suitable for use with electric motor and VFD drive combinations
- Flow Adjustment Method (when paired with P300 + VFD): Variable frequency electronic control
- Turndown Ratio Supported (with VFD): 10:1
- API Standard Supported: API 675 (steady-state accuracy, linearity, repeatability)
- Manufacturer: Wanner Engineering, Inc. (Hydra-Cell brand)
Frequently Asked Questions
Q: What is the Hydra-Cell 112-416 gearbox used for?
The 112-416 is a 40:1 gear reducer purpose-built for the Wanner Hydra-Cell P300 series metering pump. It mechanically reduces the input shaft speed from the drive motor to the slower rotational speed the P300 crankshaft needs for accurate, controlled-volume fluid metering.
Q: Can the 112-416 gearbox be used with a variable frequency drive (VFD)?
Yes. The 112-416 is specifically designed to work in conjunction with a VFD. By pairing this 40:1 reducer with a VFD-controlled motor, operators can adjust pump flow electronically across a 10:1 turndown ratio while keeping the motor and VFD sized as small and efficiently as possible.
Q: Does using the 112-416 gearbox allow me to use a smaller motor?
Yes. Because the gearbox mechanically steps down the shaft speed and maintains the necessary torque at the pump input, the drive motor does not need to produce that torque directly. This means a smaller horsepower motor can be specified, reducing both equipment acquisition costs and ongoing energy consumption.
Q: Can one motor and 112-416 gearbox drive multiple P300 pump heads?
Yes. The Hydra-Cell P300 platform supports multiplexing, where a single motor and gearbox combination drives more than one pump head. This allows operators to meter multiple fluids simultaneously — or configure spare, double-flow, or ratio-blending setups — without purchasing separate drive systems for each pump.
Q: Is the 112-416 gearbox oil lubricated separately from the pump's hydraulic fluid?
Yes. The 112-416 gearbox is a separate, self-contained housing with its own gear lubricant supply. This physical separation from the pump's hydraulic actuating oil prevents any cross-contamination between the two fluid systems, which is an important design feature in chemical dosing and process-critical installations.
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