Craftsman 919.156830 - User Manual

The Sears Craftsman air compressor is a single-stage, 1-cylinder unit designed to compress air for various applications. It consists of an air compressor pump, an air tank, wheels, handles, and associated controls, including an air chuck. Unlike many air compressors, this model is permanently lubricated, meaning it does not require oiling or additional lubrication, simplifying maintenance. The compressed air can be used to operate a variety of pneumatic tools and accessories such as paint spray guns, air tools, caulking guns, grease guns, air brushes, sandblasters, and for inflating tires and plastic toys, as well as spraying weed killers and insecticides. It is important to note that this model is not equipped with a pressure regulator, which is often necessary for most applications. Separate air transformers for regulation and moisture/dirt removal may be required.

Important Technical Specifications:

The manual provides detailed specifications for both models:

Model Numbers: 919.156730 and 919.156830
Horsepower: 3 HP for both models
Displacement CFM: 11.8 for both models
Bore: 2 3/8" for both models
Stroke: 1.35" for both models
Voltage-Single Phase: 120/240 volts (wired for 120V, convertible to 240V)
Minimum Branch Circuit Requirement: 15 amps
Fuse Type: "Fusetron" Type T*** (dual element time delay fuses are recommended if protected by fuses)
Air Tank Capacity: 15 gallons (ASME certified for model 919.156830)
Approximate Cut-in Pressure: 80 PSIG
Approximate Cut-out Pressure: 100 PSIG
SCFM @ 40 psig: 8.5
SCFM @ 90 psig: 7.0

The compressor features a pressure switch that automatically starts the motor when tank pressure drops below the "cut-in" pressure and stops it when the "cut-out" pressure is reached. A pressure release valve automatically releases compressed air from the compressor head and outlet tube when the compressor reaches "cut-out" pressure or is shut off, allowing the motor to restart freely. A safety valve is included to protect against high pressure if the pressure switch fails to shut off the compressor, "popping out" at its pre-set pressure. The tank pressure gauge indicates the reserve air pressure.

Usage Features:

Assembly: The manual details the steps for assembling the wheels, wheel plates, handle, rubber foot strip, and shut-off valve. Pipe sealant is required for the shut-off valve adapter threads.
Installation: The compressor should be located in a clean, dry, and well-ventilated area, at least 12 inches away from walls or obstructions to ensure proper cooling.
Electrical Connection: It requires a 3-wire extension cord with a 3-blade grounding plug and a 3-slot receptacle. Extension cords should be no longer than 50 feet and 12 gauge (AWG) or larger (10 AWG and 8 AWG may also be used; 14 or 16 AWG are not recommended) to avoid voltage drop and power loss. The compressor is designed for 120V operation but can be converted to 240V by replacing the attached three-prong 240V plug.
Break-In Procedure: A one-time break-in procedure is required before first use, involving running the compressor for 15 minutes with the shut-off valve open to prevent pressure build-up, then closing the valve to allow the tank to fill to cut-out pressure.
Operation: Before attaching air hoses or accessories, the pressure switch lever should be set to "OFF," and the shut-off valve closed. Users must check the maximum pressure rating of air tools and accessories, ensuring the outlet pressure never exceeds this rating. An air regulator is needed for items with a maximum pressure rating less than 125 PSI. The compressor should always be operated in well-ventilated areas, free of flammable vapors.
Safety Guidelines: Emphasizes the importance of reading safety information, recognizing DANGER, WARNING, and CAUTION symbols. Key safety points include:
- Never touching hot parts of the compressor head to avoid burns.
- Operating in well-ventilated areas free of flammable vapors to prevent fire or explosion, especially when spraying flammable materials.
- Never modifying the air tank (drilling, welding, etc.) as it can cause rupture or explosion.
- Not tampering with the safety valve or pressure switch.
- Always wearing safety goggles or glasses when using the compressor.
- Turning off the compressor before attaching or removing accessories.
- Unplugging the compressor prior to maintenance or repair to prevent electrical shock.
- Never using the compressor outdoors in the rain.
- Never directly inhaling compressed air.
- Reading labels and safety data for all sprayed materials and using appropriate masks/respirators.
- Avoiding solvents like 1,1,1-Trichloroethane and Methylene Chloride with aluminum or galvanized parts in spray equipment, as they can cause explosions or corrosion.

Maintenance Features:

No Oil Required: This model is permanently lubricated, eliminating the need for oil changes or additions.
Air Filter Inspection: The air filter should be kept clean at all times. It can be pulled out, washed with mild detergent and warm water, or replaced if dirty. Operating without a clean air filter reduces compressor capacity.
Check Valve Inspection and Replacement: Instructions are provided for releasing air pressure, removing the shroud, outlet tube, and pressure release tube, then unscrewing the check valve for cleaning or replacement. Sealant is required for reinstallation.
Safety Valve Inspection: Users are instructed to occasionally pull the ring on the safety valve to ensure it operates freely. A stuck or non-smoothly operating valve must be replaced with the same type.
Motor: The motor has an automatic reset thermal overload protector that shuts off the motor if it overheats. The motor will automatically restart after cooling. Frequent shutdowns may indicate a voltage problem.
Draining Water from Air Tank: Water will condense in the air tank and must be drained regularly (at approximately 20 psi tank pressure) to prevent corrosion, weakening, and rupture of the tank. The drain cock should be opened to allow moisture to drain.
Troubleshooting Guide: A comprehensive guide helps diagnose and correct common issues such as excessive tank pressure, air leaks at various points (fittings, check valve, air tank, head/valve plate), knocking noise, insufficient air supply, and motor not running. It provides causes and corresponding corrections, emphasizing safety precautions like unplugging the compressor and bleeding off air pressure before attempting repairs.