Hands On
Service Methods and Tips

JAN/FEB 2002
Volume 45/Issue 1


Project Articles
9-Drawer Workshop Toolbox
Child's Desk and Chairs
Candle Sconce and Desktop Pencil Holder

Ask Smitty
Owner’s Gallery
Letters from Owners
Academy Notes
Finishing Touches - Pt.3 Applying a Natural Finish
Service Pointers
Speed Changer
Safety Tips
Safety Is Your Decision

What's New
The Standard Anniversary Model Shopsmith MARK V

Find A Shopsmith Woodworking Academy Near You

National Woodworking Academy in Dayton, OH

Online Accessory Catalog
Request Printed Accessory Catalog
Online Replacement Parts Catalog

Find A Shopsmith
MARK V Demo Near You

Request MARK V Information Package

Links Worth Visiting
Free Woodworking Tips

Contacting Shopsmith

Copyright 2002.
Shopsmith, Inc.
All Rights Reserved

Troubleshooting Table
Speed Changer

Printer friendly PDF copy of article

On the Shopsmith MARK V, the Speed Changer is a dial that is used to control the speed or rpms of the machine's main or auxiliary spindle. This speed is adjustable from 700 to 5200 rpms. With the machine turned ON, you turn the dial clockwise to increase the speed -- counter-clockwise to reduce the speed.

Before changing operations or turning the machine off, ALWAYS return the Speed Dial to the "A" (Slow) setting. Failure to do so puts unnecessary strain on the machine during start-up and could fuses to blow or circuit-breakers to cut out when the machine is turned back on.

Unless performing certain maintenance procedures, NEVER turn the Speed Dial when the MARK V is not running, as this could damage the speed changing mechanism. WARNING: ALWAYS unplug the MARK V prior to performing any service procedure.


Possible Cause(s)


MARK V won't change speeds from high to low -- or low to high

Control sheave stuck on idler shaft

Floating sheave stuck on motor shaft.

Bent or burred long key in motor shaft.

Motor sheaves mis-aligned.

Free sticking sheave. Lubricate sheave and idler shaft.

Free sticking sheave. Lubricate motor shaft and floating sheave.

Remove key. File off burr or replace key.

Align motor sheaves.

Speed setting creeps up when MARK V is running

Leaf spring under handle doesn't press hard enough against control handle

Speed control bracket bearing worn

Worm gear worn

Remove control handle, gently bend spring up slightly

Replace control bracket

Replace worm gear

Speed dial hard to turn

Sheaves sticking

Foreign matter in quadrant mechanism

Faces of sheaves damaged

Lower sheaves misaligned

Keys on motor or idler shafts damaged

Lubricate sheaves, motor and idler shaft

Clean mechanism

Remove burrs or nicks with fine file

Align lower sheaves

Remove burrs from keys with file -- or replace keys

Speed changes when handle is turned, but speed dial doesn't move

Gears behind handle stripped

Replace either handle, idler gear or speed dial, whichever is worn

Speed dial moves when handle is turned, but speed doesn't change

Control arm quadrant worn

Retaining loop on upper floating sheave disconnected

Control handle mounted improperly on control shaft

Replace control arm quadrant

Connect retaining loop to control arm quadrant

Tighten setscrew in handle so it seats in depression on worm control shaft

Speed dial rattles

Spring under speed dial broken or missing

Repace spring

Speed dial doesn't lay flat in headstock

Screws loose, missing or holes stripped

Tighten or replace screws, if holes are stripped, add nuts

Control handle comes off

Control handle improperly mounted on control shaft

Tighten setscrew in handle so it seats in depression on shaft

If you have tried these remedies and they didn’t work . . . or if you’re experiencing difficulties that are not listed here, feel free to call Shopsmith’s TOLL-FREE Technical Services Hotline (1-800-762-7555) for the answer or send an e-mail to Shopsmith Technical Support.

WARNING: Always unplug machine before making any adjustments or performing any maintenance procedures.