Roper Pump N41-320-1 Gear Reducer 3.20 to 1 for 11 17 22 GHB
The Roper N41-320-1 is the 3.20 to 1 built-on gear reducer for 11, 17 and 22 GHB pumps. A gear pump moving thick product has to turn slowly, but standard electric motors turn fast, and this reducer resolves that directly by mounting on the pump head and taking the motor speed down before it reaches the pumping gears. At a 3.20 to 1 ratio a nominal 1750 revolutions per minute motor turns the pump at roughly 545 revolutions per minute.
Of the three common ratios in this family, 3.20 to 1 is the fastest and therefore the highest flow option, which makes it the usual choice where the product is heavy enough to need reduction but not so heavy that the pump struggles to fill its gear teeth at that speed. Built-on reduction is also mechanically tidy: there is no separate reducer to align, no extra coupling to wear out and no additional baseplate real estate to find. What the reducer does need is its own oil, kept at the correct level and changed on schedule, since it runs on gear oil entirely separate from the liquid the pump is handling.
Key Features
- Genuine Roper Pump Company built-on gear reducer, part number N41-320-1
- 3.20 to 1 reduction ratio, giving roughly 545 revolutions per minute from a nominal 1750 revolutions per minute motor
- Mounts directly on the pump head, with no separate baseplate or extra coupling to align
- Sized for the 11, 17 and 22 GHB pump frames
- The fastest of the common ratios in this reducer family, and therefore the highest flow
Applications
- 11, 17 and 22 GHB gear pumps driven by standard speed motors
- Moderately viscous liquid transfer
- Fuel oil, heavy oil and lubricant handling
- Mixing, blending and recirculation packages
- Retrofit where a pump is running too fast for the product
Specifications
- Brand: Roper Pump Company
- Part Number: N41-320-1
- Part Type: Built-on gear reducer
- Ratio: 3.20 to 1
- Fits: 11, 17 and 22 GHB pump frames
- Configuration Note: GHB denotes a tapped port case with an outboard ball bearing and a built-on gear reducer
- Lubrication: Separate charge of gear oil, independent of the pumped liquid
- Condition: New
Frequently Asked Questions
Q: How do I choose between the available ratios?
Work back from the pump speed the product needs, then pick the ratio that lands closest to it with the motor you actually have. Going slower than necessary costs flow you may need.
Q: Can the reducer be fitted to a pump that was built without one?
The GHB designation exists precisely because the pump head has to be built to accept it, so check what your pump plate says before planning the work.
Q: What oil does the reducer take?
A gear oil of the grade called for in your service instructions, filled to the level plug rather than by measured volume, and changed on the interval given for the unit.
Q: Does reduction change the pressure rating?
No. The reducer changes shaft speed, which changes flow. The pressure the pump can develop is set by the pump itself and by the relief protection fitted to it.
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm the correct gear reducer before you order.
CLRMarine
