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SKU 99780-81 

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

Page 6

electrically malfunction or break 

down, grounding provides a low 

resistance path to carry electricity 

away from the user, reducing the risk 

of electric shock.  

(see 3-prong plug 

and Outlet.)

The grounding prong in the plug is 

2. 

connected through the green wire in-

side the cord to the grounding system 

in the tool.  The green wire in the cord 

must be the only wire connected to 

the tool’s grounding system and must 

never be attached to an electrically 

“live” terminal.  

(see 3-prong plug 

and Outlet.)

The tool must be plugged into an 

3. 

appropriate outlet, properly installed 

and grounded in accordance with all 

codes and ordinances.  The plug and 

outlet should look like those in the 

preceding illustration.  

(see 3-prong 

plug and Outlet.)

symbology

Double Insulated

Canadian Standards Association

Underwriters Laboratories, Inc.

V~

Volts Alternating Current

a

Amperes

n0 xxxx/min.

No Load Revolutions per Minute 

(RPM)

speciFicatiOns

Electrical Requirements 120 V~ / 60 Hz / 9.3 A
Air Hose Connection

1/4” 18 NPT

Maximum Air Pressure

155 PSI 

Air Pressure Cut On

125 PSI

Air Tank Capacity

sku 99780: 17 Gallons

sku 99781: 26 Gallons

Air Flow Capacity

6 SCFM @ 40 PSI

4 SCFM @ 90 PSI

Motor

4 HP, 13000 RPM

233060

unpacKing

When unpacking, make sure that the 

item is intact and undamaged.  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.

instructiOns FOr 

putting intO use

  read the entire impOrtant 

saFetY inFOrmatiOn 

section at the beginning of this 

manual including all text under 

subheadings therein before set 

up or use of this product.

 

tO preVent 

seriOus injurY 

FrOm accidental 

OperatiOn: 

turn the power switch of the 

tool to its “OFF” position and 

unplug the tool from its 

electrical outlet before 

assembling or making any 

adjustments to the tool.

Summary of Contents for 99780

Page 1: ...ghts reserved No portion of this manual or any artwork contained herein may be reproduced in any shape or form without the express written consent of Harbor Freight Tools Diagrams within this manual m...

Page 2: ...indicates a hazardous situation which if not avoided could result in minor or moderate injury NOTICE is used to address practices not related to personal injury CAUTION without the safety alert symbo...

Page 3: ...urce or moving the tool Do not overreach Keep proper d footing and balance at all times This enables better control of the tool in unexpected situations Dress properly Do not wear loose e clothing or...

Page 4: ...o reduce the risk of electric shock do not expose to rain Store indoors Do not use to supply breathing air 4 Do not direct air flow from the Com 5 pressor at people or animals Industrial applications...

Page 5: ...ncer and birth defects or other reproductive harm Wash hands after handling Califor nia Health Safety Code 25249 5 et seq The warnings precautions and in 15 structions discussed in this instruction ma...

Page 6: ...rds Association Underwriters Laboratories Inc V Volts Alternating Current A Amperes n0 xxxx min No Load Revolutions per Minute RPM Specifications Electrical Requirements 120 V 60 Hz 9 3 A Air Hose Con...

Page 7: ...3 bottom of the Air Tank 30 Secure using four Knobs 29 See Figure 1 To connect the Wheels 38 first put 4 a washer 35 at the end of each Axle 34 See Figure 2 Put the Axles 34 in the wheel brack 5 ets...

Page 8: ...ns Read the entire Important Safety Information section at the beginning of this manual including all text under subheadings therein before set up or use of this product To prevent serious injury from...

Page 9: ...reaker will trip and it will shut off If this happens move the Power Switch to the OFF a position wait until the Compressor cools b down push the Circuit Breaker button c turn Power Switch back to the...

Page 10: ...condition that may affect its safe operation After Use 2 clean external surfaces of the tool with clean cloth 3 WARNING If the supply cord of this power tool is damaged it must be replaced only by a...

Page 11: ...0 Washer 3 11 Bolt 3 12 Washer 3 13 Bracket Washer 3 14 Regulator 1 15 Screw ST4x18 4 16 Screw ST4x20 2 17 Cord Retainer 1 18 Rear Handle 1 19 Connector 1 20 Valve 1 Parts List Part Description Qty 21...

Page 12: ...Page 12 ASSEMBLY DIAGRAM Record Product s Serial Number Here Note If product has no serial number record month and year of purchase instead Note Some parts are listed and shown for illustration purpos...

Page 13: ...of this warranty the product or part must be returned to us with trans portation charges prepaid Proof of purchase date and an explanation of the complaint must accompany the merchandise If our inspec...

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