Troubleshooting Guide

The air compressor should be turned off and unplugged from the power source before any maintenance is performed as well as the air bled from the tank and the unit allowed time to cool,

Personal injuries could occur from moving parts, electrical sources, compressed air, or hot surfaces.

PROBLEM

POSSIBLE CORRECTION

Air leaks at the check valve A defective check valve results in a constant air leak at the pressure release valve or at the pressure relief valve, i when there is pressure in the tank and the compressor is shut off. Drain the tank, then remove and clean or replace the check valve.

Air leaks between head and cylinder,

Air leak from safety valve.

Pressure reading on the regulated pressure gauge drops when an accessory is used.

Be sure of proper torque on head bolts. If leak remains, contact a service technician.

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.

If there is an excessive amount of pressure drop when the accessory is used, replace the regulator.

NOTE:

Adjust the regulated pressure under flow conditions (while accessory is being used).

It is normal for the gauge to show minimal pressure loss during initial use of the tool.


Excessive tank pressure.	Move the Auto-On/Off lever to the Off position. If the unit doesn'tshut off,
	unplug it from the power source and contact	a service technician.
Motor will not start.	Make sure power cord is plugged in and the	switch is on. Inspect for the proper size
	fuse in your circuit box. If the fuse was tripped, reset it and		restart the	unit. If
	- rcpc_tcd tripping occurs, rep!ace the check va!v£ or contact		a serv!ce	technician.

Excessive moisture in the discharge air.

Air leaks from the tank body or tank welds.

Remove the water in the tank by draining after each use. High humidity environments will cause excessive condensation. Utilize water filters on your air line.

NOTE:

Water condensation is not caused by compressor malfunction. Be sure the compressor's air output is greater than your tool'sair consumption rate.

Never drill into, weld or otherwise modify the air tank or it will weaken. The tank can rupture or explode. Compressor cannot be repaired. Discontinue use of the air compressor.

921.1521 specifications

The Craftsman 921.1521 is a powerful and versatile tool that has garnered attention among DIY enthusiasts and professionals alike. This air compressor is designed to tackle a variety of tasks, making it an essential addition to any workshop or garage. With its robust features and advanced technologies, the 921.1521 stands out in its category.

One of the key features of the Craftsman 921.1521 is its impressive power output. This air compressor is equipped with a 1.5-horsepower motor, providing a substantial amount of air pressure for a wide range of applications. It has a maximum pressure of 150 PSI, which allows it to handle demanding tasks such as powering nail guns, spray painting, and inflating tires with ease.

Additionally, the 921.1521 is designed with a 6-gallon tank, which ensures a steady air supply for longer periods of use. This feature minimizes downtime, allowing users to complete their projects more efficiently. The tank is also constructed from high-quality materials, ensuring durability and longevity over time.

Portability is another significant aspect of the Craftsman 921.1521. It features a lightweight design coupled with a convenient handle, making it easy to transport from one job site to another. The compressor also comes equipped with rubber feet that provide stability during operation, ensuring safety and reducing vibrations.

The Craftsman 921.1521 incorporates user-friendly technologies, such as an automatic shut-off feature that helps prevent over-pressurization. This not only protects the compressor but also enhances user safety. Furthermore, maintenance is straightforward, with easy access to all essential components for routine checks and upkeep.

Another notable characteristic of the 921.1521 is its noise reduction capabilities. With noise levels significantly lower than many competitors, it is suitable for use in residential areas without disturbing neighbors. This feature makes it ideal for home improvement projects and other tasks where noise may be a concern.

In conclusion, the Craftsman 921.1521 air compressor is a powerful, portable, and versatile tool equipped with essential features and technologies that cater to a wide range of tasks. Its combination of strength, efficiency, and ease of use makes it an excellent choice for both DIYers and professionals seeking reliable performance in their projects. Whether inflating tires, powering tools, or completing home improvement tasks, the Craftsman 921.1521 stands ready to meet the challenge.