Replacement Guide

Fenner FW40 Replacement — Complete TRV 40 Compatibility Guide

If you have a worn-out Fenner FW40 worm gearbox and need a replacement, the TorqDrive TRV 40 is a direct dimensional match. In most installations it bolts straight in with no modification to your motor, output shaft or mounting bracket.

Is the TRV 40 really a direct replacement?

Yes. The TRV 40 follows the same NMRV/FW dimensional standard as the Fenner FW40. This standard fixes the centre distance, mounting hole pattern, output shaft bore and IEC input flange — so a same-frame, same-ratio TRV 40 matches the original Fenner unit.

Matching dimensions (FW40 / TRV 40)

Dimension	Specification
Centre distance	40 mm
Output hollow shaft bore	18 mm
Input motor flange	IEC 63 or 71 (B5 / B14)
Mounting	Foot, flange or face — same hole pattern
Max output torque	54 Nm
Max input power	0.37 kW

Because these match the original, your existing motor, driven shaft and bracket all fit the TRV 40.

What to check before ordering

• Gear ratio — note the ratio on your old FW40 nameplate (e.g. i=30) and order the same. Available 7.5:1 to 100:1.
• Motor frame — confirm IEC 63 or 71, and B5 (flange) or B14 (face).
• Mounting position — so the output shaft points the right way.
• Output bore — standard 18 mm hollow; confirm if you need an output shaft kit or torque arm.

How to read your old Fenner nameplate

The Fenner nameplate shows the model (FW40), the ratio (i=NN) and the motor frame. If the plate is worn or unreadable, use the TorqDrive Gearbox Identifier — enter the dimensions and it tells you the matching TRV model.

Why buy the TRV 40 replacement from TorqDrive

• Direct FW40 dimensional match — no machine modification
• Same-day dispatch before 3 PM from Kolkata
• Cash on Delivery available across India
• GST invoice for input tax credit
• 1-year warranty

Replacing a different Fenner size? We cover FW30 through FW150. WhatsApp us your old nameplate details and we'll confirm the right TRV model.

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