VPI-HW19 first model

A common problem with the early HW19 motors which were not rigidly mounted like everyone else was doing at the time and VPI changed to.

VPI should be able to provide you with a replacement 600 rpm motor capacitor that should greatly reduce motor vibration. I’ve successfully used their 0.47pfd 600VDC snubber capacitor although it is optimal for the 300 rpm Hurst motors.

Rigidly mounting the motor on a proper absorptive metal piece to further sink noise as well as heat would be much preferred. The optional VPI SAMA - stand alone motor accessory was (is?) specifically designed for this purpose.

I’ve rebuilt a number of those Hurst motors which is fairly easy to do if you have access to VPI’s locking (set-screw) output shaft collars 👍

With the output shaft clip removed along with the bottom friction-fit cover removed, just push the output shaft into the motor housing and remove from the bottom of the motor.

Identical to the top washer/bushing, you’ll find a matching washer/bushing at the base.

A good solvent cleaning and removal of grease will allow you to check its conditions including shaft wear. If OK, reload with a good synthetic grease such as Royal Purple® Ultra-Performance Grease and reassemble 👍

Setting the in/out output shaft play is very easy during reassembly if you have the VPI output shaft collar w/set-screw. Just a perceptible amount of play is perfect.

Experience rebuilding these has clearly shown that the motors NOT coupled to an absorbent metal are more likely to be worn beyond repair to due over temperature wear. Mechanically coupling these Hurst motors is imperative to optimal performance.

While the mechanical aspects of the motor are critical, don’t underestimate the electrical performance!

Jan @ VPI did a fair amount of practical research into the vibrational performance of various motor capacitors. The newer high voltage caps are readily available and highly recommended if you’re NOT using an external controller such as their SDS which can “cog” the motor when line voltages are lowered. (Line level voltages are essential for properly conveying Pace, Rhythm and Timing on high mass systems IMO.)

Best of luck! You’ve got nothing to loose 👍

To emphasize the importance of mechanical grounding, press an edge of the motor frame against something of mass such as the top of your work table with it turning. Feel what happens when the vibration can drain off 😳

@czarivey Great to hear it lived to see another life!

I think you’re going to realize excellent performance from that old Hurst motor now that care has been given with proper cleaning & lubrication.

Happy listening 🎶