Roper Pump N41-460-1 Gear Reducer 4.60 to 1 for 11 17 22 GHB
The Roper N41-460-1 is the 4.60 to 1 built-on gear reducer for 11, 17 and 22 GHB pumps, the deepest of the three common ratios for these frames. It brings a nominal 1750 revolutions per minute motor down to roughly 380 revolutions per minute at the pumping gears, which is where the heaviest products are handled: material that has to be heated before it will move at all, and anything that would be torn or aerated by a faster pump.
Deep reduction has a second benefit beyond filling the gears. Torque at the pump shaft rises as speed falls, so a heavily reduced package can break away against cold, stiff product that would stall a faster drive, which matters on a line that has been left standing overnight. The trade off is flow, since every revolution taken off the pump takes volume with it, so the ratio should be matched to the product rather than chosen for safety. As with the rest of the family, the reducer bolts directly to the pump head, runs on its own charge of gear oil and needs that oil kept at level and changed on schedule.
Key Features
- Genuine Roper Pump Company built-on gear reducer, part number N41-460-1
- 4.60 to 1 reduction ratio, giving roughly 380 revolutions per minute from a nominal 1750 revolutions per minute motor
- Deepest of the common ratios for these frames, for the heaviest products
- Higher shaft torque for breaking away against cold, stiff product
- Sized for the 11, 17 and 22 GHB pump frames
Applications
- 11, 17 and 22 GHB gear pumps on very heavy product
- Asphalt, bunker fuel and roofing compound service
- Molasses, heavy syrup and feed supplement transfer
- Shear sensitive products that should not be pumped quickly
- Lines that stand and cool between runs
Specifications
- Brand: Roper Pump Company
- Part Number: N41-460-1
- Part Type: Built-on gear reducer
- Ratio: 4.60 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: Is more reduction always the safer choice?
Not if you still need the flow. Every step down in speed is a step down in delivered volume, so match the ratio to the product rather than defaulting to the deepest one available.
Q: Does deeper reduction help with a hard start on cold product?
It does. Torque at the pump shaft climbs as speed drops, so a heavily reduced drive has more to work with against a line that has stiffened while standing.
Q: Should the line be heated before starting?
On heavy product, yes. Bringing jacket or trace heat up first lets the pump turn against a thinner liquid and keeps the starting load off the drive train and the seal.
Q: What is the first sign a reducer is in trouble?
A change in sound and a housing that runs hotter than usual, often before any leak appears. Check the oil level and condition at that point rather than after the noise becomes obvious.
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
