Craftsman 921.166420 User Manual

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Owner's Manual

CRAFTS

AIR COMPRESSOR

20-gallon

1.5 HP

Oil-Free, Direct Drive

Model No. 921.166420

CAUTION"

Before using this product,

read this manual and follow

all its Safety Rules and

Operating Instructions.

• Safety Instructions

• Installation & Operation

• Maintenance & Storage

• Troubleshooting Guide

• Parts List

• Espa_ol, p. 11

Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.

www.sears.com

11/14/2008

Part No. E103645

Table of Contents

Questions and Answers:

T
taylorjenniferAug 15, 2025
What to do if my Craftsman Air Compressor motor will not start?
- P
  Peggy BradshawAug 15, 2025
  First, ensure the Thermal Overload Switch on the back of the motor is pushed in. Next, check that the power cord is properly plugged in and the switch is turned on. Inspect your circuit box for the correct fuse size. If the fuse has tripped, reset it and restart the unit. If the issue of repeated tripping persists, it could indicate a faulty check valve, consider replacing it, or contact a service technician.
Q
qmeyersAug 18, 2025
Why does my Craftsman Air Compressor thermal overload protector cut out repeatedly?
- J
  Jesse MooreAug 18, 2025
  The thermal overload protector may be cutting out repeatedly due to a lack of ventilation or a room temperature that is too high; move the compressor to a cooler environment. It can also happen because of excessive air usage, indicating that the compressor is too small for the application; try lowering the rate of air consumption.
T
tracey48Aug 22, 2025
What to do if my Craftsman 921.166420 has excessive tank pressure?
- M
  Melissa AllenAug 22, 2025
  Move the Auto-On/Off switch to the Off position. If the unit doesn’t shut off, unplug it from the power source and contact a service technician.
B
Bryan AlvaradoAug 25, 2025
What to do if my Craftsman 921.166420 Air Compressor pressure reading on the regulated pressure gauge drops when an accessory is used?
- R
  ryoungAug 26, 2025
  If there is an excessive amount of pressure drop when the accessory is used, replace the regulator. Adjust the regulated pressure under flow conditions (while the accessory is being used). It is normal for the gauge to show minimal pressure loss during initial use of the tool.
K
Kelly BradyAug 28, 2025
What to do if there is excessive moisture in the discharge air of my Craftsman Air Compressor?
- D
  Dr. Peter ColemanAug 28, 2025
  To address excessive moisture, remove the water from the tank by draining it after each use. Remember that high humidity environments can cause excessive condensation. Consider using water filters on your air line. Water condensation is not caused by compressor malfunction. Ensure the compressor’s air output is greater than your tool’s air consumption rate.
J
Juan SummersAug 31, 2025
What to do if my Craftsman 921.166420 has air leaks at the check valve?
- J
  Justin WellsAug 31, 2025
  A defective check valve can cause a constant air leak at the pressure relief valve when there is pressure in the tank and the compressor is shut off. To fix this, drain the tank, then remove and either clean or replace the check valve.
E
Elizabeth Maxwell MDSep 3, 2025
What to do if my Craftsman Air Compressor has air leak from safety valve?
- R
  romanmeghanSep 3, 2025
  Operate the safety valve manually by pulling on the ring. If the valve continues to leak when in the closed position, it should be replaced.
J
Judith WillisSep 7, 2025
What to do if my Craftsman 921.166420 has air leaks between head and cylinder?
- C
  Christopher CampbellSep 7, 2025
  Ensure proper torque on the head bolts. If the leak persists, contact a service technician.

Craftsman 921.166420 Specifications

General

Model Number	921.166420
Max Pressure	150 PSI
Tank Capacity	6 Gallons
Power Source	Electric
Weight	40 lbs
CFM at 40 PSI	4.0 CFM
Voltage	120V
Amperage	15 Amps
Pump Type	Oil-Free
Horsepower	1.5 HP

Summary

Safety Symbols

Important Safety Instructions and Guidelines

Risk of Moving Parts

Warning about potential injury from moving parts during operation or maintenance.

Risk of Burns

Caution regarding hot surfaces on the compressor during and after operation.

Risk of Falling

Advice to operate the compressor on a stable surface to prevent tipping or falling.

Risk from Flying Objects

Requirement to wear safety glasses and avoid pointing nozzles at people or animals.

Specifications

Glossary

Duty Cycle

Parts & Features

Regulator and Gauges

Explanation of the regulator for pressure control and the tank/regulator gauges.

Pressure Switch and Safety Valves

Details on the pressure switch for motor control and safety/relief valves for excess pressure.

Air Intake Filter and Drain Valve

Information on the air intake filter for clean air and the drain valve for tank condensation.

Installation & Assembly

Location and Grounding

Guidelines for proper placement and electrical grounding of the compressor.

Extension Cord Requirements

Specifications for using extension cords, including gauge and length.

Break-In Procedure

Information stating no user break-in procedure is required for this compressor.

Operating Procedures

Daily Start-Up Procedures

Step-by-step guide for starting the air compressor for daily use.

Daily Shut-Down Procedures

Step-by-step guide for safely shutting down and preparing the compressor after use.

Maintenance

Maintenance Schedule

Recommended checks and tasks to perform before each use or daily.

Safety Valve Check

Instructions on how to test the functionality of the safety valve.

Troubleshooting Guide

Exploded View

Parts List

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