Craftsman 921.16474, 921.16475 User Manual

Owner's Manual

AIR COMPRESSOR

Belt Drive, Electric

25 and 27 Gallon

Model No. 921.16475 Model No. 921.16474

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. 17

• Fran_:ais, p. 29

Sears Brands Management Corporation, Hoffman Estates, IL 60179 U.S.A.

www.craftsman.com

3/16/2010 Part No. 200-2792

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WARRANTY ....................................... 2

SPECIFICATION CHART ............................ 2

SAFETY GUIDELINES ............................. 3-4

GLOSSARY OF TERMS ............................. 4

OVERVIEW ....................................... 5

Basic Air Compressor Components ................. 5

ASSEMBLY ....................................... 5

COMPRESSOR CONTROLS ......................... 6

MOTOR RESET AND WIRING ........................ 6

ELECTRICAL POWER REQUIREMENTS ............... 7

Electrical Wiring ................................ 7

Extension Cords ................................ 7

Grounding Instructions ........................... 7

OPERATING INSTRUCTIONS ........................ 8

Break-in of the Pump ............................ 8

Daily Startup ................................... 8

Shutdown ..................................... 8

MAINTENANCE .................................... 9

Draining the Tank ............................... 9

Checking the Oil ................................ 9

Changing the Oil ................................ 9

Belt Tension and Pulley Alignment ............... 9-10

Replacing or Cleaning the Check Valve ............. 10

Cleaning the Air Filter ........................... 11

Checking the Relief Valve ........................ 11

Testing for Leaks .............................. 11

Storage ...................................... 11

SERVICE INTERVAL ............................... 11

TROU BLESHOOTI NG CHART ....................... 12

PARTS DRAWINGS AND PARTS LISTS ............. 13-17

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CRAFTSMAN ONE YEAR FULL WARRANTY FOR ONE YEAR from the date of purchase, this product is warranted against any defects in material or workmanship.

Defective product will receive free repair or free replacement if repair is unavailable.

For warranty coverage details to obtain repair or replacement, visit the web site: www.craftsman.com

This warranty does not cover the air filter or drive belt, which are expendable parts that can wear out from normal use

within the warranty period.

This warranty is void if this product is ever used while providing commercial services or if rented to another person.

This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

Sears Brands Management Corporation, Hoffman Estates, IL 60179 U.S.A.

[,,,___o] _I[_

RUNNING TANK CAPACITY VOLTAGE/ KICK-IN KICK-OUT

MODEL NO. H.P. GALLONS AMPS/PHASE PRESSURE PRESSURE

921.16474 120 150

(WLB1982713) 1.9 Vert. 27 (102) 115/15/1 (8,27 bar) (10,34 bar)

921.16475 120 150

(WPB1982513) (8,27 bar) (10,34bar)

1.9 Horiz. 25 (94,6) 115/15/1

2 200-2792

ThefollowinginformationrelatestoprotectingYOURSAFETYandPREVENTINGEQUIPMENTPROBLEMS.Tohelpyourecognize thisinformation,weusethefollowingsymbols.Pleasereadthemanualandpayattentiontothesesections.

__ - A POTENTIAL HAZARD THAT WILL CAUSE SERIOUS INJURY OR LOSS OF LIFE. _L_- A POTENTIAL HAZARD THAT COULD CAUSE SERIOUS INJURY OR LOSS OF LIFE. __ - A POTENTIAL HAZARD THAT MAY CAUSE MODERATE INJURY OR DAMAGE TO

EQUIPMENT.

RISK OF FIRE OR EXPLOSION.

RISK OF BURSTING.

RISK OF ELECTRICAL SHOCK.

RISK OF INJURY.

RISK OF BURSTING.

RISK OF BURNS.

Never spray flammable liquids in a confined area. It is normal for the motor and pressure switch to produce sparks while operating. If sparks come into contact with vapors from gasoline or other solvents, they may ignite, causing fire or explosion. Always operate the compressor in a well-ventilated area. Do not smoke while spraying. Do not spray where sparks or flame are

)resent. Keep compressor as far from spray area as possible.

Do not weld, drill or modify the air tank of this compressor. Welding or modifications on the air compressor tank can severely impair tank strength and cause an extremely hazardous condition. Welding or modifying the tank in any manner will void the warranty.

Never use an electric air compressor outdoors when it is raining or on a wet surface, as it may cause an electric shock.

This unit starts automatically. ALWAYS shut off the compressor, remove the plug from the outlet, and bleed all pressure from the system before servicing the compressor, and when the compressor

is not in use. Do not use the unit with the shrouds or belt guard removed. Serious injury could occur from contact with moving parts.

Check the manufacturer's maximum pressure rating for air tools and accessories. Compressor outlet pressure must be regulated so as to never exceed the maximum pressure rating of the tool. Relieve all pressure through the hose before attaching or removing accessories.

High temperatures are generated by the pump and manifold. To prevent burns or other injuries, DO NOT touch the pump, manifold or transfer tube while the pump is running. Allow them to cool

before handling or servicing. Keep children away from the compressor at all times.

RISK TO BREATHING.

RISK OF EYE INJURY.

RISK OF BURSTING.

200-2792 3

Be certain to read all labels when you are spraying paints or toxic materials, and follow the safety instructions. Use a respirator mask if there is a chance of inhaling anything you are spraying. Read all instructions and be sure that your respirator mask wilt protect you. Never directly inhale the

compressed air produced by a compressor. It is not suitable for breathing purposes.

Always wear ANSI Z87.1 approved safety goggles when using an air compressor. Never point any nozzle or sprayer toward a person or any part of the body. Equipment can cause serious injury if the spray penetrates the skin.

Do not adjust the relief valve for any reason. Doing so voids all warranties. The relief valve has been pre-set at the factory for the maximum pressure of this unit. Personal injury and/or property damage may result if the relief valve is tampered with.

Do not use plastic or pvc pipe for compressed air. Use only galvanized steel pipe and fittings for compressed air distribution lines.

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RISK TO HEARING.

Always wear hearing protection when using an air compressor. Failure to do so may result in hearing loss.

The power cord on this product contains lead, a chemical known to the State of California to cause cancer, and birth defects or other reproductive harm. Wash hands after handling.

NOTE: ELECTRICAL WIRING.

Drain the moisture from the tank on a daily basis. A clean, dry tank will help prevent corrosion.

Pull the pressure relief valve ring daily to ensure that the valve is functioning properly, and to clear the valve of any possible obstructions.

To provide proper ventilation for cooling, the compressor must be kept a minimum of 12 inches (31 cm) from the nearest wall, in a vvell-ventilated area.

Fasten the compressor down securely if transporting is necessary. Pressure must be released from the tank before transporting.

Protect the air hose and electric cord from damage and puncture. Inspect them weekly for weak or worn spots, and replace if necessary.

To reduce the risk of electric shock, do not expose to rain. Store indoors.

Never operate the compressor ifthe power cord or plug are damaged. Have the unit serviced at a Sears or other qualified service center.

Refer to the air compressor's serial label for the unit's voltage and amperage requirements. Ensure

[hat all wiring is done by a licensed electrician, in accordance with the National Electrical code.

CFM Cubic feet per minute; a unit of measure of air flow.

PSI

Pounds per square inch; a unit of measure of air pressure.

Kick-in pressure Factory set low pressure point that starts the compressor to repressurize the tank to a higher pressure.

Kick-out pressure Factory set high pressure point that stops the compressor from increasing the pressure in the tank above a certain level.

Well-ventilated A means of providing fresh air in exchange for dangerous exhaust or vapors.

Dedicated circuit

An electrical circuit reserved for the exclusive use of the air compressor.

4 200-2792

BASIC AIR COMPRESSOR COMPONENTS

The basic components of the air compressor are the electric

motor, pump, pressure switch and tank (see Fig. 1).

The electric motor (see A) powers the pump. The electric motor is equipped with an overload protector to help prevent possible motor burnout. If the motor becomes overheated, the overload protector will shut itdown. Should this occur, allow the motor to cool for 10-15 minutes, then press (never force) the

motor reset switch to restart the motor.

The pump (see B) compresses the air and discharges it into the tank.

The tank (see C) stores the compressed air.

The pressure switch (see D) shuts down the motor and relieves air pressure in the pump and transfer tube when the air pressure in the tank reaches the kick-out pressure. As compressed air is used and the pressure level in the tank drops to the kick-in pressure, the pressure switch restarts the motor automatically, without warning and the pump resumes compressing air.

B i ,

Fig. 1

ASSEMBLING THE COMPRESSOR

This compressor was shipped with oil in the pump

crankcase. Check oil before operating the air compressor,

see Check Oil under Maintenance.

Unpack the air compressor. Inspect the unit for damage. If

the unit has been damaged in transit, contact the carrier

and complete a damage claim. Do this immediately

because there are time limitations to damage claims.

The carton should contain:

• air compressor

• operator/parts manual

• handle (horizontal tank)

2. Check the compressor's serial label to ensure that you

have received the model ordered, and that it has the

required pressure rating for its intended use.

Install the handle by loosening the set screws (F) and then

placing the handle ends (E) into the handle brackets (G)

and secure with the set screws (F) (see Fig. 2). Tighten

screws using a size 3mm hex wrench (not included).

4. Locate the compressor according to the following

guidelines:

clean, well-ventilated area, to ensure sufficient air flow and cooling.

c. In cold climates, store portable compressors in a

heated building when not in use. This wilt reduce problems with lubrication, motor starting and freezing

of water condensation.

d. The compressor must be level to ensure proper

lubrication of the pump and good drainage of the moisture in the tank.

5. Connect an air hose (not included) to the manifold outlet.

a. Position the compressor near a grounded electrical

outlet (see GROUNDING INSTRUCTIONS). Avoid using an extension cord; use a longer air hose instead.

b. The flywheel side of the compressor must be at least

12 inches (31 cm) from any wall or obstruction, in a

200-2792 5

Fig. 2

Pressure Switch (see A)

This switch turns on the compressor. It is operated manually, but when in the ON position, it allows the compressor to start up or shut down automatically, without warning, upon air demand.

ALWAYS set this switch to OFF when the compressor is not

being used, and before unplugging the compressor.

Pressure Relief Valve (see B)

If the pressure switch does not shut down the motor when pressure reaches the preset level, this valve wilt pop open automatically to prevent over pressurization. To operate manually, pull the ring on the valve to relieve air pressure in the

tank.

Tank Pressure Gauge (see C)

This gauge measures the pressure level of the air stored in the tank. It is not adjustable by the operator, and does not indicate line pressure.

Air Pressure Regulator (see D)

This air pressure regulator enables you to adjust line pressure to the tool you are using.

__ Never exceed the maximum working

pressure of the tool.

Turn the knob clockwise to increase pressure, and counterclockwise to decrease pressure.

Horizontal tank

Regulated Pressure Gauge (see E)

This gauge measures the regulated line pressure.

Quick Connect (see F)

A quick release for attaching and removing the air hose.

MOTOR RESET SWITCH

__Ensure that all guards and shrouds are in

place before pressing the reset switch to restart the motor.

If the motor shuts down because of overload, wait 10-15 minutes so the motor can cool down, then press (NEVER force) the reset switch (see G) to restart the motor (see Fig. 4)

NOTE:

Some models are equipped with a dual voltage motor 115/230 volt. Most models are factory wired

for 115 volt operation. If conversion from 115 volt to 230 volt is required, refer to the motor nameplate and have the conversion performed by

a Licensed Electrician.

Vertical tank

Fig. 3

Fig. 4

6 200-2792

ELECTRICAL WIRING

Refer to the air compressor's serial label for the unit's voltage

and amperage requirements.

product is properly grounded. Do not modify the plug provided; if it will not fit the outlet, have the proper outlet installed by a

licensed electrician.

Use a dedicated circuit

For best performance and reliable starting, the air

compressor must be plugged into a dedicated circuit, as close as possible to the fuse box or circuit breaker. The

compressor will use the full capacity of a typical 15 amp household circuit. If any other electrical devices are drawing from the compressor's circuit, the compressor may fail to start. Low voltage or an overloaded circuit can result in sluggish starting that causes the motor overload protection system or circuit breaker to trip, especially in cold conditions.

NOTE: To handle the initial electrical toad of starting the air compressor, a circuit breaker is recommended. If the air compressor is connected to a circuit protected by a fuse, use dual element time delay fuses (Buss Fusetron type "T" only).

EXTENSION CORDS

NOTE: Avoid use of extension cords.

For optimum performance, plug the compressor power cord directly into a grounded walt socket. Do not use an extension cord unless absolutely necessary. Instead, use a longer air hose to

reach the area where the air is needed.

If use of an extension cord cannot be avoided, the cord should be no longer than 50 feet and be a minimum wire size of 12 gauge (AWG). Do not use a 16 or 14 gauge extension cord.

Use only a 3-wire extension cord that has a 3-blade grounding plug, and a 3-slot receptacle that wilt accept the plug on the product. Make sure your extension cord is in good condition. An undersized cord will cause a drop in line voltage, resulting in loss of power and overheating. The smaller the gauge number, the heavier the cord.

GROUNDING INSTRUCTIONS

115V

115 VOLT

15 AMP

Plug

Fig. 5

""- Grounded Outlet

Box

_ Grounded Outlet

230V

,,...

Grounding Pin

FOR CORD-CONNECTED MODELS:

This product should be grounded. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.

This product is equipped with a cord having a grounding wire

with an appropriate grounding plug. The plug must be plugged

into an outlet that is properly installed and grounded in accordance with all local codes and ordinance.

IL_ Improper installation of the

grounding plug can result in a risk of electric shock. If repair or replacement of the cord or plug is necessary, do not connect the grounding wire to either fiat blade terminal of the plug. The wire" insulation having an outer surface that is green with or without yellow stripes is the grounding wire.

This product is for use on a 115 or 230 volt circuit. A cord

with a grounding plug, as shown here, shall be used.

Make sure that the product is connected to an outlet having the same configuration as the plug (see Fig. 5). No adapter should be used with this product.

Check with a licensed electrician if the grounding instructions are not completely understood, or if in doubt as to whether the

200-2792

BREAK-INOFTHEPUMP

1. Checktheoillevelinthepump(see"CheckingtheOil"inthe

maintenancesection).

2. TurnthepressureswitchtotheOFFposition(seeC).

3. Openthepetcock(seeF).Turninthecounterclockwise

direction.

__Escaping air and moisture can

propel debris that may cause eye injury, Wear safety goggles when opening petcock,

Plug in the power cord.

Turn the pressure switch to the ON position (see D). The

compressor will start. Allow the compressor to run for 30

minutes, to break in the internal parts.

NOTE: After about 30 minutes, if the unit does not operate

properly, SHUT DOWN IMMEDIATELY, and contact a Sears or other qualified service center.

6. After about 30 minutes, turn the pressure switch to

the OFF position.

7. Close the petcock (see E). Turn in the clockwise direction.

8. Turn the pressure switch to the ON position. The

compressor wilt start and fill the tank to the kick-out

pressure and stop.

Open the petcock (see F) to allow moisture to drain from the tank.

__Escaping air and moisture can

propel debris that may cause eye injury. Wear safety goggles when opening petcock.

Fig. 6

NOTE: As compressed air is used, the pressure switch will

restart the motor automatically to supply more compressed air to the tank.

DAILY START-UP

1. Check the oil level in the pump (see "Checking the Oil" in the

maintenance section).

2. Turn the pressure switch to the OFF position (see C).

3. Close the tank petcock (see E). Turn in the clockwise

direction.

4. Plug in the power cord.

__ High temperatures are generated

by the electric motor and the pump. To prevent burns or other injuries, DO NOT touch the compressor while it is running. Allow it to cool before handling or servicing. Keep children away

from the compressor at all times.

5. Turn the pressure switch to the ON position (see D).

6. Adjust the regulator to the working pressure of the tool.

__When adjusting from a higher to a

lower pressure, turn the knob counterclockwise past the desired setting, then turn clockwise to reach the desired pressure. Do not exceed operating pressure of the tool or accessory being used.

OFF (C)

(D) AUTO

SHUTDOWN

1. Turn the pressure switch to the OFF position (see C).

2. Unplug the power cord.

3. Reduce pressure in the tank through the outlet hose. You

can also pull the relief valve ring (see G) and keep it open

to relieve pressure in the tank.

F OPEN

\ CLOSE E

8 200-2792

MAINTENANCE

ADJUSTING DRIVE BELT TENSION

__ To avoid personal injury, always shut off

and unplug the compressor and relieve all air pressure from the system before performing any service on the air

compressor.

Regular maintenance will ensure trouble-free operation. Your electric powered air compressor represents high-quality engineering and construction; however, even high-quality machinery requires periodic maintenance. The items listed below should be inspected on a regular basis

DRAINING THE TANK

,__Condensation will accumulate in

the tank. To prevent corrosion of the tank from the inside, this moisture must be drained at the end of every workday. Be sure to wear protective eyewear. Relieve the air pressure in the system and open the petcock on the bottom of the tank to drain.

CHECKING THE OIL

To check the oil level in the pump, unscrew the dipstick and wipe off oil. Screw the dipstick all the way in and then unscrew. The pump oil level should be between between add (see C) and full (see B). Replace the dipstick. Do not overfill

or underfill.

NOTE: Use synthetic, non-detergent air compressor oil.

CHANGING THE OIL

Remove the oil plug (see A) and drain the oil until it slows to a drip, then close. Add compressor oil (approx. 18 oz.) until it is between full (see B) and add (see C) when the dipstick (see D) is screwed completely into the hole. Never overfill or underfill the

pump.

NOTE: The compressor is pre-fitted with synthetic oil. Use synthetic, non-detergent air compressor oil.

__ RISK OF INJURY. This unit starts

automatically. ALWAYS shut off the compressor,

remove the plug from the outlet, and bleed all pressure from the system before servicing the

compressor, and when the compressor is not in use.

Do not use the unit with the shrouds or belt guard removed. Serious injury could occur from contact

with moving parts.

Proper belt tension and pulley alignment must be maintained for maximum drive efficiency and belt life. The correct tension exists if a deflection (see A) of 112" (13 mm) occurs by placing 5 lbs (2.3 kg) of force (see B) midway between the motor pulley and the pump flywheel (See Fig. 8). This deflection can be adjusted by the following procedure. The pulley should be carefully aligned with the flywheel, and all setscrews should be

kept tight.

1. Remove the belt guard.

2. Loosen the motor mounting bolts.

3. Shift the motor to the point where the correct

deflection exists (A & B).

4. Retighten the motor mounting bolts.

5. Check to ensure that the tension remained correct.

6. Reinstall the belt guard. All moving parts must be guarded.

Fig. 8

Motor

B = Full C = Add

Fig. 7 A

BELT TENSION AND PULLEY ALIGNMENT

__ To avoid personal injury, always shut off

and unplug the compressor and relieve all air pressure from the system before performing any service on the air

compressor. NOTE: Drive belt tensioning and pulley alignment are done

at the same time. They are discussed separately for clarity. 200-2792 9

Motor

bolls

Pump F_ywhee_

Compressor may vory from one shown

PULLEY ALIGNMENT

Motor

Compressor may yaw from one shown

,_IL_RISK OF INJURY. This unit starts

automatically. ALWAYS shut off the compressor, remove the plug from the outlet, and bleed all pressure from the system before servicing the compressor, and when the compressor is not in use.

Do not use the unit with the shrouds or belt guard removed. Serious injury could occur from contact

with moving parts.

To check pulley alignment, remove the belt guard and place

a straightedge (see A) against the pump flywheel (see B) (See Fig. 9). Measure and record the distance from the straightedge to

the edge of the drive belt at point C. Then measure the distance

from the straightedge to the edge of the drive belt again at points

D and E. Both distances should be the same as at point C. If D or E are different from C, there is a misalignment which must be corrected before the compressor is run. To correct a pulley misalignment, use the following procedure.

1. Remove the belt guard.

2. Loosen the motor mounting bolts.

3. Loosen the setscrew on the motor pulley.

4. Align the motor pulley with the pump flywheel (C-D-E must be equal ).

5. Retighten the motor pulley setscrew.

6. Adjust the proper belt tension.

7. Retighten the motor mounting bolts.

8. Reinstall the belt guard. All moving parts must be guarded.

Motor'

Motor bolts

REPLACING OR CLEANING THE CHECK VALVE

__RISK OF INJURY. This unit starts

automatically. ALWAYS shut off the compressor,

remove the plug from the outlet, and bleed all pressure from the system before servicing the

compressor, and when the compressor is not in use.

Do not use the unit with the shrouds or belt guard removed. Serious injury could occur from contact

with moving parts.

1. Turn air compressor off, remove the power cord from the outlet or lock out the power supply and relieve all the air pressure from the tank. Make sure the compressor has cooled down before servicing.

2. Loosen the compression nut fitting on the check valve and pump head using an adjustable wrench. Remove the transfer

tube.

3. Loosen the compression nut fitting on the side of the check valve and pressure switch using an adjustable wrench.

Remove the bleeder tube.

4. Making note of the orientation for reassembly, unscrew the check valve from the tank (counterclockwise) using a 7/8" open end wrench.

5. Using a pencil or screwdriver, carefully push the valve disc up and down. If the valve disc does not move freely up and down, the check valve needs to be cleaned or replaced.

6. Clean the check valve with warm soapy water and make sure to dry thoroughly before reinstalling. If the disc valve still does not move freely up and down, it will need to be replaced.

7. Apply thread sealant to the check valve threads and reinstall

into the tank by turning clockwise. Make sure it is the same

orientation as when it was removed.

8. Replace the bleeder tube and tighten compression nuts.

9. Replace the transfer tube and tighten compression nuts.

10. Perform the "Break-in of the pump" procedure in the operating instructions to make sure there are no leaks and

it's working properly.

Screwdriver

C_oselposition

Open position

penc_i

10 200-2792

CLEANING THE AIR FILTER

A dirty air filter wilt reduce the compressor's performance and life. To avoid any internal contamination of the pump, the filter should be cleaned frequently, and replaced on a regular basis. Felt filters should be cleaned in warm, soapy water, rinsed, and allowed to air dry before reinstaltation. Paper filters should be replaced when dirty. Do not allow the filter to become filled with dirt or paint. If the filter becomes filled with paint, it should be replaced. Direct exposure to dirty conditions or painting areas will void your warranty.

CHECKING THE RELIEF VALVE

Pull the relief valve daily to ensure that it is operating

properly and to clear the valve of any possible obstructions,

TESTING FOR LEAKS

Check that all connections are tight. A small leak in any of the hoses, transfer tubes, or pipe connections wilt substantially reduce the performance of your air compressor. If you suspect a leak, spray a small amount of soapy water around the area of the suspected leak with a spray bottle. If bubbles appear, repair or replace the faulty component. Do not over tighten any

connections.

STORAGE

Before storing the compressor for a prolonged period, use an air blow gun to clean all dust and debris from the compressor. Disconnect the power cord and coil it up. Pull the pressure relief valve to release all pressure from the tank. Drain all moisture

from the tank. Clean the filter element and filter housing; replace

the element if necessary. Drain the oil from the pump crankcase and replace it with new oil. Cover the entire unit to protect it from

moisture and dust.

Daily or after Every 100

Perform the following maintenance at the intervals indicated below, each use operating hours

Inspect and clean air filter •

Check pump oil level •

Change pump oil (Use synthetic, non-detergent air compressor oil) •

Operate the pressure relief valves • Check belt tension •

Drain tank •

Check and tighten all bolts (do not over tighten) •

200-2792 11

Note: Troubleshooting problems may have similar causes and solutions.

PROBLEM POSSIBLE CAUSE SOLUTION Excessive current draw Low voltage/motor overload Check that power supply is adequate and that compressor is on a

trips circuit breaker or dedicated circuit. If using extension cord, try using without. If motor reset switch compressor is connected to a circuit protected by a fuse, use dual

element time delay fuses (Buss Fusetron type "T" only).

Drive belt too tight Readjust belt tension. Restricted air passages Inspect and replace transfer tubes or the check valve, (see "To replace

or clean check valve" in the maintenance section).

Compressor stalls Low voltage to motor Furnish adequate power.

Bad check valve Replace the check valve (see "To replace or clean check valve" in the

maintenance section).

Seized pump Contact a Sears or other qualified service center.

Low discharge pressure Air leaks Tighten or replace leaking fittings or connections. Do not overtighten.

Leaking valves Contact a Sears or other qualified service center. Restricted air intake Clean or replace air filter element(s). Blown gaskets Contact a Sears or other qualified service center.

Worn piston rings or cylinder Contact a Sears or other qualified service center.

Compressor pump Loose motor pulley or pump Retighten pulley and flywheel. Check alignment. knocking flywheel

Low oil level in pump crankcase Keep oil at proper level at all times. Excess carbon on valves or top of Contact a Sears or other qualified service center.

3iston

Oil in discharge air Worn piston rings or cylinder Contact a Sears or other qualified service center.

Restricted air intake Clean or replace the air filter element(s). Oil level too high Reduce to proper level.

Overheating Poor ventilation Relocate compressor to an area with cool, dry, well circulated air, at

Dirty cooling surfaces Clean all cooling surfaces thoroughly. Restricted air passages Inspect and replace transfer tubes or the check valve, (see "To replace

Excessive belt wear Pulley out of alignment Realign pulley with compressor flywheel.

Improper belt tension Readjust. Pulley wobbles Replace the pulley and check for a damaged crankshaft or flywheel.

Compressor won't start Too much back pressure in tank Open petcock when starting motor. in cold temperatures 40W oil in crankcase Use synthetic, non-detergent air compressor oil.

Compressor too cold Move compressor to a warmer location.

Air leaking through Dirty or defective check valve. Replace or clean the check valve (see "To replace or clean check bleeder valve after valve" in the maintenance section).

compressor shuts off

least 12 in. from nearest wall.

or clean check valve" in the maintenance section).

12 200-2792

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