Browning TorqTaper Plus Shaft Mount Reducers

A TorqTaper Plus reducer mounts directly on the driven shaft, carried by a single tapered bushing, and is held against rotation by a torque arm. Ordering one is three decisions: the case size, which comes from the motor horsepower, the service factor class and the output speed you need; the ratio, which comes from that output speed alone; and the parts that complete the drive — the bushing for your shaft, the torque arm, and whichever of the backstop, motor mount, belt guard and fan kit the application calls for. This guide works through each of them, gives the part numbers by case size, and shows which Browning size replaces another manufacturer's reducer.

How do you select a shaft mount reducer by motor HP?

Start from the motor horsepower and the service factor class the application is rated at. A Class I selection uses the motor horsepower as it stands; a Class II selection multiplies it by 1.4 and a Class III selection multiplies it by 2.0, and the reducer is then selected using that factored horsepower. When the factored horsepower falls between two listed motor horsepower sizes, the next larger size is used.

With the factored horsepower in hand, the case size is the one whose output speed range covers the speed your driven machine needs at that horsepower. Sizes run 107, 115, 203, 207, 215, 307, 315, 407, 415, 507, 608 and 800, motor horsepower runs from 1/4 to 600, and output speeds run from 5 to 400 rpm; the larger the case size, the lower the output speed it is selected for at a given horsepower. The table below is the first two case sizes, which shows how the ranges step down: at 3 HP a 107 covers 32 to 400 rpm output and a 115 covers 23 to 31 rpm, so a 3 HP drive that has to turn at 25 rpm is a 115.

A blank means that case size is not selected at that motor horsepower. Some horsepower and speed combinations are marked as needing a fan kit, and a fan kit is listed for case sizes 307 and larger. Above 25 HP the selection moves to the larger case sizes in the shaft mount reducers category; send us the horsepower, class and output speed and we will confirm the size.

Which ratio do you order for your output RPM?

The ratio is read straight from the output speed, and it is the last two digits of the reducer part number. Five ratios cover the whole range: 35:1 for an output between 5 and 50 rpm, 25:1 between 51 and 80, 15:1 between 81 and 130, 9:1 between 131 and 200, and 5:1 between 201 and 400.

The ratio is exact, so the output speed follows from the input speed: a 207SMTP25 is a 207 case size at 25:1, which turns 70 rpm from a 1750 rpm input, and a 315SMTP15 is a 315 at 15:1, which turns 116.67 rpm from the same input. Both are rated at 80 percent efficiency.

How do you complete the reducer and bushing part numbers?

The reducer number is the case size, the series letters, and the ratio code added at the end — 05, 09, 15, 25 or 35. A 115SMTP09 is therefore a 115 case size at 9:1. The bushing number is the case size, the letters TBP, and a three-digit shaft code: the first digit is the whole number of inches of the shaft diameter, and the second and third digits are the remainder in sixteenths of an inch.

A 1 7/16 inch shaft is 1 whole inch and 7 sixteenths, so the code is 107 and the bushing for a 115 reducer is a 115TBP107, whose bore measures 1.4375 inches. The bushing kit arrives with the bushing, key, capscrews and stabilizer ring. Every case size has a largest shaft it will take: a 115 goes to 1.9375 inches, a 207 to 2.4375 inches and a 315 to 3.9375 inches, so the shaft code also decides whether the case size you selected on horsepower will actually fit the shaft.

What is the complete part number for my case size and ratio?

The ratio code goes on the end of the case size, and the table below is every completed TorqTaper Plus number we hold. Read down to the case size you selected on horsepower and across to the ratio your output speed calls for; the cell is the number to order, linked to its own product page. A dash is a combination we do not hold.

A dash states what we hold now, not what the manufacturer builds; the published case size and ratio ranges are in the tables above. On case sizes 407 through 608 the ratio code sits before a trailing B, so the number in the cell carries one.

The same gear set is built in three other configurations, and their numbers carry a suffix the TorqTaper Plus does not. The suffix names the input the unit is built for and is part of the number to order, so the numbers below are given in full; one case size can be held in more than one of them at the same ratio.

Repair parts filed with the reducers name no ratio, and a unit built at a ratio outside the five codes above has no column here. Both sit with the reducers in the shaft mount reducers category.

What are the torque arm, backstop, motor mount and fan kit for?

A torque arm is required on every shaft mount application: the reducer hangs on the driven shaft, so something has to react to the driven torque. The rest are fitted where the application calls for them: a backstop and a belt guard if required, with any applicable safety rules and regulations consulted on both, and a fan kit where the selection calls for one.

The motor mount comes in two base heights and the choice is about the belt drive between the motor and the reducer input: a low base gives shorter belt drive center distances, a high base gives longer ones. The input shaft diameter in the table below is what you select the driven bushing against when you size that belt drive and its V-belt sheave. A 207TAP-H torque arm kit and a 115-203BSP backstop kit both fit every ratio their case size is built in.

On case sizes 407 through 608 the ratio code and the shaft code sit before a trailing B, shown here as underscores. An empty fan kit cell means none is listed for that case size.

Case sizes 407 and larger list a high base only. Torque arms, backstops, motor mounts, belt guard brackets, fan kits and filtered breather kits are in the speed reducer accessories category.

Which Browning size replaces another maker's reducer?

Shaft mount reducers interchange by case size, so a reducer already on the shaft tells you which Browning size to order without re-selecting on horsepower. Find the number on the existing unit in the table below and read across to the Browning case size; the ratio code you add is the same on both sides, so a Falk Quadrive 5207JR25 is a 207SMTP25.

The Falk numbers take the same ratio code at the end as the Browning reducer. The cross reference guide covers the same exercise for bearings, bushings and couplings.

Which TorqTaper Plus reducers are stocked?

The shaft mount reducers category carries the TorqTaper Plus in all five ratios across the case sizes, together with the three other input and output configurations built on the same gear set: a finished output bore instead of a bushing, a C-face input for a motor bolted straight to the reducer, and a hydraulic adapter on the input.

Gear kits, seal kits and bearing kits for a reducer already in service, along with the right angle units, sit alongside them under gearing. If you have the horsepower, the service factor class and the output speed but not the size, or a competitor number you want matched, send them through the cross reference form and we will confirm the reducer, the bushing for your shaft and the accessories before you order.