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Craftsman 921.16476 - User Manual

Craftsman 921.16476
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Owner’s Manual
CAUTION:
Before using this product,
read this manual and follow
all its Safety Rules and
Operating Instructions.
Sears Brands Management Corporation, Hoffman Estates, IL 60179 U.S.A.
www.craftsman.com
5/7/2010
Part No. 200-2794
AIR COMPRESSOR
Oil Lubricated
Single Stage
Belt Drive, Electric
60 Gallon Vertical
Model No. 921.16476
• Safety Instructions
• Installation & Operation
• Maintenance & Storage
• Troubleshooting Guide
• Parts List
• Español, p. 18
• Français, p. 29

Table of Contents

Questions and Answers

  • J
    Justin NortonAug 15, 2025
    Why does my Craftsman Air Compressor trip the circuit breaker?
    • K
      karinarichardsonAug 15, 2025
      Excessive current draw can trip the circuit breaker due to several reasons. It could be due to low voltage or motor overload, in which case you should check that the power supply is adequate and that the compressor is on a dedicated circuit. Another cause might be a drive belt that's too tight; readjusting the belt tension may resolve this. Restricted air passages can also cause this issue; inspect and replace the transfer tubes or the check valve.
  • C
    christopher97Aug 18, 2025
    What to do if my Craftsman 921.16476 Air Compressor has low discharge pressure?
    • D
      David PattersonAug 18, 2025
      Low discharge pressure in your Craftsman Air Compressor can stem from several issues. Check for air leaks and tighten or replace any leaking fittings or connections, being careful not to overtighten. Also, clean or replace the air filter element(s) if the air intake is restricted.
  • J
    John RandallAug 22, 2025
    Why is there oil in the discharge air from my Craftsman 921.16476?
    • C
      cdavisAug 22, 2025
      Oil in the discharge air of your Craftsman Air Compressor can be caused by worn piston rings or a worn cylinder. Another potential cause is a restricted air intake, so cleaning or replacing the air filter element(s) may help. If the oil level is too high, reduce it to the proper level.
  • A
    Andre BanksAug 25, 2025
    Why won't my Craftsman Air Compressor start in cold temperatures?
    • J
      Jennifer ContrerasAug 25, 2025
      If your Craftsman Air Compressor won’t start in cold temperatures, it could be due to too much back pressure in the tank; open the petcock when starting the motor. The use of 40W oil in the crankcase can also prevent starting; use synthetic, non-detergent air compressor oil instead. Also, the compressor might be too cold, so move it to a warmer location.
  • J
    John AllenAug 28, 2025
    How to prevent my Craftsman Air Compressor from overheating?
    • N
      nmarshallAug 28, 2025
      Overheating in your Craftsman Air Compressor can occur due to poor ventilation. Relocate the compressor to an area with cool, dry, well-circulated air, ensuring it's at least 12 inches from the nearest wall. Dirty cooling surfaces can also cause overheating, so clean all cooling surfaces thoroughly. Inspect and replace transfer tubes or the check valve if the air passages are restricted.
  • M
    Melvin ThompsonAug 31, 2025
    What causes a knocking sound in my Craftsman 921.16476 pump?
    • E
      Eric MorganAug 31, 2025
      A knocking sound in your Craftsman Air Compressor pump may be due to a loose motor pulley or pump flywheel; retighten the pulley and flywheel, and check their alignment. Another cause could be a low oil level in the pump crankcase; ensure you keep the oil at the proper level at all times.
  • J
    Jamie SanchezSep 3, 2025
    What to do if my Craftsman 921.16476 Air Compressor stalls?
    • L
      Leslie TuckerSep 4, 2025
      If your Craftsman Air Compressor stalls, it could be due to low voltage to the motor; ensure you furnish adequate power. Another potential cause is a bad check valve.
  • M
    Melissa BarkerSep 7, 2025
    How to reduce excessive belt wear on my Craftsman Air Compressor?
    • J
      Jonathan BartlettSep 7, 2025
      Excessive belt wear on your Craftsman Air Compressor can occur if the pulley is out of alignment; realign the pulley with the compressor flywheel. Improper belt tension can also cause this, so readjust the tension. If the pulley wobbles, replace it and check for a damaged crankshaft or flywheel.
  • J
    Jennifer PhillipsSep 10, 2025
    Why is air leaking through the bleeder valve of my Craftsman 921.16476 after it shuts off?
    • M
      Michelle DavisSep 12, 2025
      Air leaking through the bleeder valve after your Craftsman Air Compressor shuts off is likely due to a dirty or defective check valve.

Summary

Product Warranty Information

Compressor Specification Details

Critical Safety Guidelines

Key Safety Instructions

Critical safety warnings and precautions for operating the compressor.

Glossary of Technical Terms

System Overview

Basic Component Identification

Describes the main functional parts of the air compressor system.

Compressor Assembly Procedure

Step-by-Step Assembly Guide

Step-by-step guide for putting the air compressor together.

Typical Installation and Setup

Air Dryer and Aftercooler Integration

Explains the role of air dryers and aftercoolers in the air line.

Moisture and Air Filtration Management

Details on removing moisture and filtering air for tool protection.

Air Pressure Regulation for Tools

How to set and use air regulators for optimal tool performance.

Air Lubrication for Tools

Guidance on using lubricators for specific tools and avoiding contamination.

Installation of Shut-Off Valves

Importance and placement of shut-off valves for maintenance isolation.

Compressor Control Panel Functions

Main Power Disconnect Switch

Instructions for the primary switch to control power to the compressor.

Pressure Switch Operation

How the pressure switch manages motor operation based on tank pressure.

Tank Safety Valve Function

Function of the safety valve for overpressure protection.

Pressure Release Valve Explanation

Explains the valve that releases pressure from the compressor head.

Tank Pressure Gauge Reading

Details on the gauge that shows internal tank pressure.

Electrical Power and Grounding Requirements

Motor Reset Switch Procedure

Procedure for resetting the motor after an overload shutdown.

Electrical Wiring Guidelines

Guidelines for proper electrical wiring and connections.

Main Power Panel Setup

Recommendations for a dedicated circuit and power panel setup.

Low Voltage Issues and Solutions

Discusses issues arising from low voltage supply and wiring.

Grounding Connection Instructions

Essential safety instructions for grounding the compressor system.

Operating the Air Compressor

Pump Break-In Procedure

Initial run-in procedure for new pump components.

Daily Compressor Start-Up Steps

Steps for starting the compressor on a daily basis.

Compressor Shutdown Procedure

Correct procedures for safely shutting down the compressor.

Routine Maintenance Procedures

Draining the Air Tank

Procedure for draining moisture from the tank to prevent corrosion.

Checking Pump Oil Level

How to check and maintain the correct oil level in the pump.

Changing Pump Oil

Steps for draining and refilling the compressor's oil.

Drive Belt Tension and Alignment

Adjusting belt tension and pulley alignment for optimal performance.

Routine Maintenance Procedures

Pulley Alignment Guide

Correctly aligning the motor and pump pulleys for belt longevity.

Drive Belt Replacement Process

Steps for safely replacing the drive belt.

Check Valve Replacement or Cleaning

Detailed instructions for replacing or cleaning the check valve.

Scheduled Service Intervals

Cleaning the Air Filter Element

Instructions for cleaning or replacing the air filter element.

Checking the Relief Valve Daily

Daily check to ensure the relief valve is functioning properly.

Testing for Air Leaks

Method for detecting and fixing air leaks in the system.

Proper Compressor Storage

Procedures for properly storing the compressor for extended periods.

Troubleshooting Common Issues

Excessive Current Draw Troubleshooting

Diagnosing and resolving issues causing circuit breaker trips.

Compressor Stalling Solutions

Identifying causes and solutions for the compressor motor stopping.

Low Discharge Pressure Diagnosis

Troubleshooting low air pressure output from the compressor.

Compressor Pump Knocking Causes

Addressing unusual knocking sounds from the compressor pump.

Oil in Discharge Air Issues

Finding the cause of oil contamination in the discharged air.

Compressor Overheating Solutions

Solutions for compressor overheating issues.

Excessive Belt Wear Causes

Diagnosing and fixing causes of premature belt wear.

Cold Temperature Start Issues

Tips for starting the compressor in cold weather conditions.

Bleeder Valve Air Leak Resolution

Resolving issues with air leaks from the bleeder valve.

Air Compressor Parts Drawing

Air Compressor Parts List

A comprehensive list of all parts for the air compressor.

Pump Assembly Parts Drawing

Pump Assembly Specifications

Technical specifications for the compressor pump assembly.

Available Service Kits and Assemblies

Complete Gasket Set Details

Information on the complete gasket set for maintenance.

Felt Filter Model Overhaul Kit

Details on the overhaul kit for felt filter models.

Canister Filter Model Overhaul Kit

Details on the overhaul kit for canister filter models.

Pump Assembly Kit Information

Information about the complete pump assembly kit.

Craftsman 921.16476 Specifications

General IconGeneral
BrandCraftsman
Model921.16476
CategoryAir Compressor
LanguageEnglish

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