Central Pneumatic 90749 User manual

AIR COMPRESSOR

6.5 HP / 8 GAL. / GASOLINE POWERED

Model 90749

ASSEMBLY AND OPERATING INSTRUCTIONS

3491 Mission Oaks Blvd., Camarillo, CA 93011

Visit ourWeb site at http://www.harborfreight.com

manual or any artwork contained herein may be reproduced in any shape or form

without the express written consent of Harbor Freight Tools.

For technical questions, please call 1-800-444-3353.

Revised Cover Page 10/04

SKU 90749 For technical questions, please call 1-800-444-3353. Page 2

PRODUCT SPECIFICATIONS

SAVE THIS MANUAL

You will need this manual for the safety warnings and precautions,assembly,operating,

inspection, maintenance and cleaning procedures, parts list and assembly diagram.

Keep your invoice with this manual. Write the invoice number on the inside of the

front cover. Keep this manual and invoice in a safe and dry place for future reference.

GENERAL SAFETY WARNINGS AND PRECAUTIONS

1. KEEP WORK AREA CLEAN AND DRY. Cluttered, damp, or wet work areas

invite injuries.

2. KEEP CHILDREN AWAY FROM WORK AREA. Do not allow children to handle

this product.

3. STORE IDLE EQUIPMENT. When not in use, tools and equipment should be

stored in a dry location to inhibit rust. Always lock up tools and equipment, and

keep out of reach of children.

4. DO NOT USE THIS PRODUCT IF UNDER THE INFLUENCE OF ALCOHOL OR

DRUGS. Read warning labels on prescriptions to determine if your judgement or

reflexes are impaired while taking drugs. If there is any doubt, do not attempt to

use this product.

Item Descri

tion

Air Tank Capacity 8 Gallons

Air Tank Design Wheelbarrow Dual Tank System

Maximum Air PSI 115 PSI

Cubic Feet Per Minute Rating 10.3 CFM @ 40 PSI / 8.5 CFM @ 90 PSI

Air Outlet Size 3/8” NPT

Tank Drain Valve Design Duel Bottom Tank Bleeders

Automatic Compressor Shut-Off Yes, At 115 PSI

Compressor Cylinder/Crankshaft Construction Cast Iron

Wheel Size / Type 10”, 4.10/8.5-4, Pneumatic

Power Source 6.5 HP Briggs & Stratton®

Intek® Gasoline Engine

Engine Displacement: 206cc

Recoil Start

Never use compressed air on yourself or another to blow off clothing, skin or hair.

REV 10/05; REV 02/06

SKU 90749 For technical questions, please call 1-800-444-3353. Page 3

5. USE EYE AND HAND PROTECTION. Wear ANSI approved safety impact eye

goggles and heavy-duty work gloves when using this product. ANSI

approved safety impact eye goggles and heavy-duty work gloves are available

from Harbor Freight Tools.

6. DRESS SAFELY. Do not wear loose clothing or jewelry, as they can become

caught in moving parts. Wear a protective hair covering to prevent long hair from

becoming caught in moving parts. If wearing a long-sleeve shirt, roll sleeves up

above elbows.

7. DO NOT OVERREACH. Keep proper footing and balance at all times to prevent

tripping, falling, back injury, etcetera.

8. INDUSTRIAL APPLICATIONS MUST FOLLOW OSHA REQUIREMENT.

9. STAY ALERT. Watch what you are doing at all times. Use common sense. Do

not use this product when you are tired or distracted from the job at hand.

10. CHECK FOR DAMAGED PARTS. Before using this product, carefully check that

it will operate properly and perform its intended function. Check for damaged

parts and any other conditions that may affect the operation of this product.

Replace or repair damaged or worn parts immediately.

11. REPLACEMENT PARTS AND ACCESSORIES: When servicing, use only

identical replacement parts. Only use accessories intended for use with this

product. Approved accessories are available from Harbor Freight Tools.

12. MAINTAIN THIS PRODUCT WITH CARE. Keep this product clean and dry for

better and safer performance.

13. MAINTENANCE: For your safety, service and maintenance should be performed

regularly by a qualified technician.

14. USE THE RIGHT TOOL FOR THE JOB. Do not attempt to force a small tool or

attachment to do the work of a larger industrial tool. There are certain

applications for which this tool was designed. It will do the job better and more

safely at the rate for which it was intended. Do not modify this tool, and do not use

this tool for a purpose for which it was not intended.

15. WARNING: The warnings, precautions, and instructions discussed in this manual

cannot cover all possible conditions and situations that may occur. The operator

must understand that common sense and caution are factors, which cannot be

built into this product, but must be supplied by the operator.

SPECIFIC PRODUCT WARNINGS AND PRECAUTIONS

1. MAINTAIN A SAFE WORKING ENVIRONMENT. Keep the work area well lit.

Make sure there is adequate surrounding workspace. Always keep the work area

free of obstructions, grease, oil, trash, and other debris. Do not use the Air

Compressor in areas near flammable chemicals, dusts, and vapors.

SKU 90749 For technical questions, please call 1-800-444-3353. Page 4

2. ALWAYS DISCONNECT THE AIR COMPRESSOR FROM ITS ELECTRICAL

POWER SUPPLY SOURCE, RELEASE ITS AIR PRESSURE, AND

DISCONNECT ALL PNEUMATIC TOOLS FROM THE MACHINE BEFORE

PERFORMING ANY SERVICES OR MAINTENANCE.

3. WARNING: Make sure to fill the Air Compressor with a premium quality,

30-weight, non-detergent, compressor oil before each use. Running the Air

Compressor with no oil or low oil will cause damage to the equipment and

void the warranty. Note: Optimal capacity of the oil reservoir is 21.5 ounces.

4. MAKE SURE ALL TOOLS AND EQUIPMENT USED WITH THE AIR

COMPRESSOR ARE RATED TO THE APPROPRIATE PSI CAPACITY. Do not

use any tool or equipment that operates over 115 PSI.

5. DRAIN AIR COMPRESSOR EVERY DAY. Do not allow moisture to build up

inside the Air Tanks (31). Do not allow the Air Compressor to sit pressurized for

longer than one hour.

6. DO NOT REMOVE THE FACTORY SEALED PRESSURE RELIEF VALVE

(13).

7. DO NOT OPEN THE AIR COMPRESSOR TANKS’ DRAIN PLUGS SO THAT

MORE THAN FOUR THREADS ARE SHOWING.

8. THE AIR COMPRESSOR TANKS’ SAFETY VALVE (42) SHOULD NOT BE

ADJUSTED. This Valve automatically releases air if the Tank pressure exceeds

the preset maximum.

9. NEVER ATTEMPT TO REPAIR OR MODIFY THE AIR TANKS (31). Welding,

drilling, or any other modification will weaken the Tanks, resulting in damage from

rupture or explosion. Always replace worn, cracked, or damage Tanks.

10. NEVER OPERATE THE AIR COMPRESSOR WITHOUT ITS SAFETY COVER

(31) ATTACHED AND IN GOOD WORKING ORDER. Air Compressor

scan start automatically without warning. Personal injury and/or property damage

could result from contact with moving parts.

11. THE AIR COMPRESSOR PARTS MAY BE HOT EVEN IF THE UNIT IS

STOPPED. Keep fingers away from the running Air Compressor. Fast moving

and hot parts will cause injury and/or burns.

12. DO NOT SPRAY FLAMMABLE MATERIALS IN THE VICINITY OF AN OPEN

FLAME OR NEAR IGNITION SOURCES INCLUDING THE AIR COMPRESSOR

UNIT. Do not direct paint or other sprayed materials at the Air Compressor.

Locate the Air Compressor as far away from the spraying area as possible to

minimize overspray and accumulation on the Air Compressor. Use a face mask/

respirator when spraying, and spray in a well ventilated area to prevent health

and fire hazards. Do not smoke when spraying paint, insecticides, or other

flammable substances. When spraying or cleaning with solvents or toxic

chemicals, follow the instructions provided by the chemical manufacturer.

REV 02/04

SKU 90749 For technical questions, please call 1-800-444-3353. Page 5

13. GASOLINE FUEL AND FUMES ARE FLAMMABLE, AND POTENTIALLY

EXPLOSIVE. Use proper fuel storage and handling procedures. Always have

several ABC Class fire extinguishers nearby.

14. KEEP THE AIR COMPRESSOR AND SURROUNDING AREA’S CLEAN AT

ALL TIMES.

15. REFILL THE ENGINE WITH GASOLINE OUTDOORS OR ONLY IN WELL

VENTILATED AREAS. Do not store, spill, or use gasoline near an open flame or

heat devices such as a stove, furnace, or water heater which utilize a pilot light or

any device that can produce a spark.

16. DO NOT REFILL THE ENGINE WITH GASOLINE WHILE THE ENGINE IS

RUNNING OR HOT.

17. WHEN SPILLS OF FUEL OR OIL OCCUR, THEY MUST BE CLEANED UP

IMMEDIATELY. Dispose of fluids and cleaning materials as per all local, state,

and federal codes and regulations. Store oil rags in a covered metal container.

18. DO NOT OPERATE THE AIR COMPRESSOR WITH KNOWN LEAKS IN THE

FUEL SYSTEM.

19. NEVER STORE FUEL OR OTHER FLAMMABLE MATERIALS NEAR THE AIR

COMPRESSOR.

20. WARNING! CARBON MONOXIDE CAN CAUSE SEVERE NAUSEA,

FAINTING, OR DEATH. DO NOT OPERATE THE AIR COMPRESSOR INSIDE

A CLOSED BUILDING OR A POORLY VENTILATED AREA.

21. FIRE AND EXPLOSION DANGER. AVOID CONTACT WITH HOT FUEL, OIL,

AND EXHAUST FUMES.

22. PROLONGED EXPOSURE TO NOISE LEVELS ABOVE 85 dBA IS HAZARD-

OUS TO HEARING. ALWAYS WEAR ANSI APPROVED HEARING PROTEC-

TION WHEN OPERATING OR WORKING NEAR THE AIR COMPRESSOR

WHEN IT IS RUNNING.

23. ALWAYS FOLLOW AND COMPLETE SCHEDULED AIR COMPRESSOR AND

ENGINE MAINTENANCE.

24. CAUTION! THE AIR COMPRESSOR CONTAINS NO AIR COMPRESSOR OIL.

Follow lubrication instructions before operating the Air Compressor.

25. CAUTION! THE GASOLINE ENGINE (5) CONTAINS NO ENGINE OIL.

Refer to the engine manufacturer’s lubrication instructions before operating the

Engine.

26. WHEN CHECKING THE ENGINE’S OIL LEVEL: Make sure to unscrew(do not

pull) the Dip Stick out.

SKU 90749 For technical questions, please call 1-800-444-3353. Page 6

27. TO EXTEND THE LIFE OF YOUR AIR TOOLS AND EQUIPMENT, it is

recommended to install an Oiler/Water Filter (not included) in series with the

Air

Output Line

of the Air Compressor. (See Figure A.)

28. MAKE SURE TO READ AND UNDERSTAND ALL INSTRUCTIONS AND

SAFETY PRECAUTIONS AS OUTLINED IN THE BRIGGS & STRATTON

GASOLINE ENGINE USER MANUAL.

29. WARNING! MAKE SURE TO TURN OFF THE GASOLINE ENGINE, RELEASE

ALL PRESSURE FROM THE SYSTEM, AND ALLOW THE UNIT TO

COMPLETELY COOL BEFORE PERFORMING ANY INSPECTION,

MAINTENANCE, OR CLEANING PROCEDURES ON THE UNIT.

30. WARNING: This product contains or produces a chemical known to the State of

California to cause cancer and birth defects (or other reproductive harm).

(California Health & Safety Code § 25249.5 et seq.)

PNEUMATIC

TOOL / EQUIPMENT

AIR

COMPRESSOR

OUTLET LINE

OILER / WATER FILTER

(NOT INCLUDED)

FIGURE A

UNPACKING

When unpacking, check to make sure all the parts shown on the Parts List on page 12

and 13 are included. If any parts are missing or broken, please call Harbor Freight Tools

at the number shown on the cover of this manual as soon as possible.

SKU 90749 For technical questions, please call 1-800-444-3353. Page 7

ASSEMBLY INSTRUCTIONS

NOTE: For additional references to the parts listed in the following pages, refer to the

Assembly Diagram on page 12 and 13.

Note: The only assembly required is as follows.

A. Put on front Tire (35): An Washer (37) goes on each side of Tire and Axle (36) fits

through hub of wheel. Insert Pin Lock (38) to keep wheel in place. Front Axle fits

into Wheel Brackets (50) and is secured in place by two Bolts (part #41) with

Washer (40), which are threaded into the hole in each Wheel Bracket.

B. Each Handle (24) fits into the Handle Bracket (45) on the side of the Air Tank (31).

Secure each Handle in place with 2 Washer/Screw combinations (29 and 30).

After assembly is complete test the roll-ability of the Air Compressor. Make sure

Front Wheel rolls properly, with no wobble. Make sure the Handles are securely

in place.

OPERATING INSTRUCTIONS

1. CAUTION: ALWAYS make sure the Air Compressor is filled to the proper

level with a

premium quality, 30-weight, non-detergent compressor oil

prior

to turning on the machine. Failure to do so will result in damage to the Air

Compressor and void its warranty.

2. To check the level of oil in the Air Compressor, observe the Oil Window (B23)

located on the Crank Shaft Case (16). Proper oil level is indicated when

FIGURE B

SAFETY VALVE

(42)

PRESSURE

GAUGE

(44)

QUICK COUPLER

(NOT INCLUDED)

TOOL

PRESSURE VALVE

(13)

T-CONNECTOR

(43)

1. Prior to using, the Air Compressor requires the attachment of a 3/8” NPT Quick

Coupler (not included) to the T-Connector (43) of the Pressure Gauge (44). To do

so, wrap approximately 4” of thread seal tape (not included) around the male

threads of the Quick Coupler. Then, wrench tighten the Quick Coupler into the “T”

Connector. (See Figure B.)

REV 02/04

SKU 90749 For technical questions, please call 1-800-444-3353. Page 8

the oil appears in the

middle of the circle

in the Oil Sight Gauge. (See Figure C.)

3. If the oil level is below the middle of the circle in the Oil Window (B23), UN-

SCREW (do not pull) the Oil Cap (23) out of the Oil Fill Hole. Next, add oil into

the Oil Fill Hole until the level of oil reaches the middle of the circle as indicated

in the Oil Window. Do not overfill. Note: Optimal capacity of the oil reservoir is

21.5 ounces. Then screw the Oil Cap back onto the Oil Fill Hole, being careful

not to strip the plastic threads. (See Figure C.)

OIL

WINDOW

(B23)

OIL CAP

(23)

FRONT VIEW SIDE VIEW

FIGURE C

4. CAUTION: ALWAYS make sure the crankcase of the Gasoline Engine

(5) is filled to the proper level with a

premium quality, 30-weight, non-

detergent engine oil

prior to starting the engine. Failure to do so will result

in damage to the Air Compressor and void its warranty. Refer to the engine

manufacturer’s instruction manual for further information.

5. Check to make sure the Drain Plugs on both Air Tanks (31) are fully closed.

(See Figures D, and E.)

TYPICAL DRAIN PLUGS

1/4” HEX

PIPE

FIGURE D

6. Turn the Tool Pressure Valve (13) clockwise all the way to allow compressed air

to build up in the Air Tanks (31). (See Figure B.)

REV 02/04

SKU 90749 For technical questions, please call 1-800-444-3353. Page 9

7. Connect the air hose (not provided) to the previously installed 3/8” NPT Quick

Coupler on the Air Outlet Line. Then, connect the other end of the air hose to the

pneumatic tool or equipment (not provided) that is to be used.

8. Start the Gasoline Engine (5). Refer to the Gasoline Engine manufacturer’s

instruction manual for further information.

9. Allow sufficient time for the Air Tanks’ Pressure Gauge (27) to indicate at least 80

PSI before using the Air Compressor. (See Figure I.)

AIR OUTLET LINE

CONTROLVALVE ASSEMBLY

(22)

PRESSURE GAUGE

(44) PRESSURE GAUGE (27)

AIR FILTER (B4)

AIRTANK (31)DRAIN PLUG

TIRE (35)

SAFETY COVER (31)

FIGURE E

GASOLINE ENGINE (5)

10. Turn the Control Valve Assembly (22) counterclockwise to allow air to the

pneumatic tool. (See Figures B, and E.)

11. NOTE: When adjusting the air pressure being forwarded to the pneumatic tool,

you will need to compare the pressure readings of both the Tanks’ Pressure

Gauge (27) and the outlet Pressure Gauge (44). The reading on the Tanks’

Pressure Gauge dictates the

maximum

air pressure at which the outlet Pressure

Gauge may be set. (See Figure E.)

12. With the Air Compressor running, and the air hose and pneumatic tool hooked up

to the Air Compressor, turn the Control Valve Assembly (22)

counterclockwise to increase the air output to the tool, up to the maximum rated

pressure (115 PSI) as indicated on the Tanks’ Pressure Gauge (27). (See Figure

E.) In any case never exceed the pressure rating of the hose or tool connected to

compressor.

13. Turn the Control Valve Assembly (22) clockwise to decrease the air output to the

tool, down to the minimum rated pressure (0 PSI) as indicated on the Tanks’

Pressure Gauge (27). (See Figure E.)

14. The Safety Valve (42) is used when decompression is needed quickly and

efficiently. (See Figure B.)

SAFETYVALVE (42)

SKU 90749 For technical questions, please call 1-800-444-3353. Page 10

15. In the event fast decompression of the Air Tanks (39) is required, immediately turn

off the Gasoline Engine (part #5) and pull out on the

Pull Ring

of the Safety Valve

(42) until both Air Tanks have fully decompressed.

(See Figures B, and E.)

16. Pull out on the Safety Valve (42) to immediately release air pressure in the Air

Tanks (31). (See Figure I.)

17. When finished using the Air Compressor, turn off the Gasoline Engine

(5), and pull out on the Pull Ring of the Safety Valve (42) until both Air Tanks (31)

have fully decompressed. (See Figures B, and E.)

INSPECTION, MAINTENANCE, AND CLEANING

1. CAUTION! Always release all pressure from the system and disconnect all

tools from the Air Compressor before performing any inspection, maintenance,

or cleaning. Be aware that the sudden release of air from any valve or air tool can

present a danger to one’s ears.

2. BEFORE EACH USE, inspect the general condition of the Air Compressor.

Check all air fittings for leaks. Check for loose screws, misalignment or binding of

moving parts, cracked or broken parts, damaged, and any other condition that

may affect the safe operation of this tool. If abnormal noise or vibration occurs,

immediately release all pressure from the system and have the problem

corrected before further use. Do not use damaged equipment.

The Drain Plugs are located underneath each Air Tank, and should be used daily

to release all trapped moisture that may cause Air Tank corrosion. Slowly and

carefully unscrew (no more than four threads) the Drain Plugs until the

condensation begins to be released from the Air Tanks. Allow sufficient time for

all of the condensation to escape from the Air Tanks. Then, firmly retighten the

Drain Plugs. (See Figure E.)

3. DAILY: EMPTY CONDENSATION FROM THE AIR TANKS (31).

4. DAILY: Check the Air Compressor oil level. If necessary, fill with a premium

quality, 30-weight, non-detergent, compressor oil. NOTE: When checking the

Air Compressor oil level, make sure to unscrew (do not pull) the Oil Cap (23).

5. EVERY 100 HOURS OF USE: Clean the Air Filter (B4) with a mild solvent. Then,

dry and reattach the Air Filter Sleeve. (Replace the Air Filter Sleeve if it is too

dirty to properly clean.) To clean or replace the Air Filter Sleeve, remove the two

Hex Socket Set Bolts. Remove the Air Filter Cover. Remove the Air Filter Sleeve

and clean. Then, replace the Air Filter Sleeve and two Hex Socket Set Bolts.

(See Figures E, and F.)

REV 02/04

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