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Bauer 20V Brushless Cordless 4-1/2 Inch Angle Grinder Owner's Manual

Quick guide for the Bauer 20V Brushless Cordless 4-1/2 Inch Angle Grinder (Model 58308). Includes setup, operation, maintenance, and troubleshooting instructions.

Quick answers from the manual

Quick answer

  • The Bauer 58308 is a 20V Brushless Cordless 4-1/2 Inch Angle Grinder. It requires a Bauer 20V Li-Ion battery and charger (sold separately). p. 1, 10

Key actions

  • Install the wheel guard before operating. p. 12
  • Install the side handle for control. p. 12

First start

  • Install the wheel guard and side handle, then insert a charged battery pack. p. 11, 12

Problems and fixes

Tool will not start

Check battery connection, charge, or thermal reset breaker.

p. 17

Maintenance and reset

  • If the thermal reset breaker trips, turn off the tool, allow it to cool, and press the reset button. p. 17

Technical specifications

Parameter Value Meaning Pages
No Load Speed 10,500/min Maximum rotational speed p. 10

Where to find it in the PDF

  • Components p. 11
  • Assembly Diagram p. 19
Table of contents

Manual images

Click an image to enlarge

Quick guide from the manual

This manual provides essential safety, setup, and operating instructions for the Bauer 20V Brushless Cordless 4-1/2 Inch Angle Grinder (Model 58308). Always read the full safety information before use. Ensure the battery pack is removed before performing any setup or maintenance.

Components

The grinder features a main handle, side handle, power switch, spindle lock button, wheel guard, and battery pack connection. Ensure all parts are intact before use.

Grinder components overview
Grinder components overview
Assembly Diagram
Assembly Diagram

Setup

Figure A: Guard Installation
Figure A: Guard Installation
Figure B: Wheel and Guard Installation
Figure B: Wheel and Guard Installation

Installing the Wheel Guard

  1. Depress the Spindle Lock Button and rotate the Clamp Nut until the spindle locks.
  2. Remove the Clamp Nut and Disc Flange.
  3. Install the Wheel Guard over the spindle.
  4. Rotate the guard to the desired position to shield you during work.
  5. Replace the Disc Flange, ensuring the flats on the bottom engage with the depressed center of the Wheel Guard.
  6. Check that the guard is firmly in place.

Installing the Side Handle

The side handle can be installed on either the left or right side of the grinder. Insert the handle into the desired position and turn clockwise to tighten.

Operation

Grinding and Wire Brushing:

  • Grip the tool firmly in both hands.
  • To start, press the back of the switch trigger down and push it forward.
  • Allow the tool to reach full speed before touching the work material.
  • Apply the wheel to the material at a 10° – 15° angle.
  • To turn off, release the switch trigger.
  • Always allow the tool to come to a complete stop before setting it down.

Maintenance

  • Before each use: Inspect for damaged battery packs, loose hardware, or binding parts.
  • After use: Wipe external surfaces with a clean cloth.
  • Cleaning: Periodically blow dust and grit out of the motor vents using dry compressed air.
  • Storage: Disconnect the battery pack and store the tool in a dry, indoor area out of reach of children.

Practical help

Common problems

Tool will not start

Check battery connection and charge. If the thermal reset breaker tripped, allow the tool to cool and press the reset button.

Tool operates slowly

Decrease pressure on the workpiece and allow the tool to do the work. Check battery charge.

Overheating

Allow the tool to work at its own rate and clean blocked motor housing vents.

Before use

  • Inspect tool for damage or loose hardware.
  • Ensure battery is charged.
  • Install wheel guard properly.
  • Install side handle.
  • Wear ANSI-approved eye protection and NIOSH-approved breathing protection.
  • Ensure work area is clean and well-lit.

Specs in practice

No Load Speed
10,500/min (RPM)
Spindle Thread
5/8"-11 UNC

Images and diagrams

  • Assembly diagram shows the internal components and part numbers for maintenance.
  • Figure A illustrates the correct order for installing the wheel guard.
  • Figure B illustrates the correct order for installing the grinding wheel and guard.

Model compatibility

  • Use Bauer 20V Li-Ion Battery Pack (64816).
  • Use Bauer 20V Li-Ion Charger (57006).

Manual page author

Michael Turner

Technical manual editor

Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.