Hyundai HHC4GAC User manual

HHC4GAC_UG_EN_0214
© 2014 MIDLAND POWER INC.

Thank you for purchasing a Hyundai Air Compressor.
Please register your product in order for us to ensure your continuous satisfac-
tion with our product.
This manual covers the safety, operation, and maintenance procedures for the
HHCSeries 4 Gallon air compressor.
All information in this publication is based on the latest product information
available at the time of approval for printing. No part of this publication may be
reproduced without written permission.
If a problem should arise, please contact us by using the contact information
found at the end of this manual.
It is important that this manual be read and fully understood before operating
the compressor. Failure to do so may cause serious injuries and/or equipment
damage.

CONTENT
1.0 Safety Instructions
1.1 General Operations Safety
1.2 AC Safety Guidelines
1.3 Maintenance Safety
1.4 Air Tank Safety
1.5 Attachments and Accessories Safety
1.6 Risk of Explosion or Fire
1.7 Risk of Bursting
1.8 Risk of Electrical Shock
1.9 Risk to Breathing
1.10 Risk of Burn
1.11 Risk of Falling
1.12 Risk of Moving Parts
2. Specications
3. Features
4. Compressor Diagram
5. Parts List
6. Start-up/Operation Instructions
7. Maintenance
8. Troubleshooting
9. Glossary
10. Warranty

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HHC4G User Manual
1.1 - GENERAL OPERATION SAFETY
1. Always perform a pre-operation check before using the air compres-
sor.
2. Operators of the unit should always be wearing appropriate approved
eye and hearing protection. Under some conditions, long durations of
use may contribute to hearing loss.
3. Always operate the air compressor according to the instructions for
safe and dependable service.
4. Always clean and properly maintain the equipment after use.
5. To avoid harm, never operate the compressor in an enclosed area.
6. Pay attention to all warning labels and be careful not to touch the
marked parts of the compressor during and immediately after opera-
tion because they may cause burns.
1.2 - AC SAFETY GUIDELINES
Before connecting the compressor to an electrical device or power cord:
1. Make sure that all parts are in right working order. Faulty devices or
power cords can lead to an electrical shock.
2. Turn off the air compressor immediately if the device begins to operate
abnormally. Then disconnect the device and investigate the problem.
1.3 - MAINTENANCE SAFETY
1. Turn off the air compressor before performing any maintenance. Oth-
erwise, it can cause severe personal injury and/or death.
2. Allow the air compressor to cool down before performing any main-
tenance.
3. Only qualied, licensed, and/or certied maintenance personnel with
knowledge of fuels, electricity, and machinery hazards should perform
maintenance procedures.
1.4 - AIR TANK SAFETY
1. Drain the tank daily or after each use. Make sure to properly drain
condensed water from the tank in order to prevent rust and/or thinning
of the steel tank.
2. If the tank develops a leak, replace it immediately with a new tank or
new compressor outt.
3. Do not attempt to modify or repair the compressor tank. Never drill,
weld, or make any modications of any kind to the tank or its attach-
ments.
4. Do not attempt to modify the pressure switch, safety valve, or any
other components that control tank pressure. The tank is designed to

6HHC4G User Manual
withstand specic operating pressures. Never make adjustments or
substitute parts to alter the factory set operating pressures.
1.5 - ATTACHMENTS AND ACCESSORIES SAFETY
1. Do not exceed the pressure rating of air tools, spray guns, air oper-
ated accessories, air tires, hoses, and other inatables. Exceeding
pressure ratings may cause them to explode or become damaged,
resulting in serious injury.
2. Make sure to follow the equipment manufacturer’s recommendation
and never exceed the maximum allowable pressure rating of attach-
ments.
3. Never use the compressor to inate small, low pressure objects, such
as children’s toys.
1.6 - RISK OF EXPLOSION OR FIRE
1. Make sure the air compressor is in a well-ventilated area, free of any
combustible or ammable materials, gasoline, or solvent vapours.
2. Make sure to keep the compressor at least 20 feet away when spray-
ing ammable materials.
3. Keep all ammable materials in a secure location away from the air
compressor.
4. Do not restrict any of the compressor’s ventilation openings. This may
cause overheating and could cause a re.
5. Make sure to operate the compressor in an open area at least 3 feet
away from any wall or obstruction that could restrict the airow of the
compressor.
1.7 - RISK OF BURSTING
1. Make sure to drain the tank after each use. If the tank develops a
leak, replace it immediately with a new tank or new compressor outt.
2. Do not attempt to modify or repair the tank. Any drilling, welding, or
other forms of modication may result in serious injury to you and/
or others.
3. Do not adjust regulator to result in output higher than marked maxi-
mum pressure of attachment.
1.8 - RISK OF ELECTRICAL SHOCK
1. Do not operate in wet environments.
2. Do not expose the compressor to rain.
3. Make sure the compressor is properly grounded. Failure to ground
the unit may increase the risk of electrical shock.

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HHC4G User Manual
4. All electrical work must be performed by a qualied or licensed/certi-
ed electrician.
1.9 - RISK TO BREATHING
1. Always operate the compressor in a well-ventilated area.
2. Wear appropriate safety masks to reduce the risk of inhaling any
harmful vapours.
3. Do not breathe compressed air from the compressor. The com-
pressed air is not breathable and may contain carbon monoxide, toxic
vapours, and/or solid particles.
4. Sprayed materials such as paint, paint solvents, paint remover, insec-
ticides, weed killers, etc. contain harmful vapours and poisons.
1.10 - RISK OF BURN
1. Do not touch any exposed metal components during or immediately
after use of the compressor. The compressor will remain hot for
several minutes after it has been shutdown.
2. Do not move the unit while the compressor is running.
1.11 - RISK OF FALLING
1. Make sure that the compressor is in a stable and secure position
before operating.
1.12 - RISK OF MOVING PARTS
1. The compressor cycles automatically when the pressure switch is in
the ON position.
2. Do not remove and safety guards or covers. If guards and/or covers
are damaged or removed, do not operate the compressor.
3. Make sure to release pressure, turn off, and disconnect the compres-
sor before performing any maintenance or repairs.
4. Secure any and all loose clothing, hair, or jewellery that may be caught
in the moving parts or the air vents of the compressor.
5. attachments.
6. Never use the compressor to inate small, low pressure objects, such
as children’s toys.

8HHC4G User Manual
SECTION 2 - SPECIFICATIONS
MODEL HHC4GAC
RUNNING HORSEPOWER 1.5 HP
MAX PSI 125 PSI
SCFM @ 40 PSI 3.5 CFM
SCFM @ 90 PSI 2.4 CFM
TANK SIZE 4 Gal
SECTION 3 FEATURES
Pressure Switch
This controls the power to the motor and the cut-in/cut-out pressure set-
tings. Also serves as the Auto-On/Off positions for the unit.
Safety Valve
This valve allows excess tank pressure to escape into the atmosphere. It
should open when tank pressure exceeds the maximum pressure rating.
Check Valve
This valve closes when the pump is not in operation in order to retain air
pressure in the tank.
Tank Pressure Gauge
Indicates the reserve air pressure in the tank.
Outlet Pressure Gauge
Indicates the outgoing air pressure to the tool or accessory.
Regulator
Controls the air pressure leaving from the tank.
Drain Valve
Used to drain excess moisture and condensation from the tank.
Air Compressor Pump
Oil-free pump that compresses the air.
Pressure Release Valve
This valve automatically releases compressed air momentarily when the
compressor reaches cut-out pressure.
Universal Quick Connect Body

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HHC4G User Manual
Allows for easy attachment and removal of the air hose.
Motor Thermal Overload Protector
If the motor begins to overheat, this protector will shut off the motor.
SECTION 4 - DIAGRAMS

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SECTION 5 - PARTS LIST
71 73
72
67
41
40
38
37 53
52
51
50
47
54
55
56
57
58
64
65
62 63
66
61
28
25
24
23
22
13
12
18
11
10
14
17
16
32
33 29
7
98
8
7
6
5
34
2
1
30
31
34
35
43
44
45
49
46
47
42
48
36
15
20
21
26
2
19 27
29
60
59
39
70
69
68

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HHC4G User Manual
1 Bolt M6x80 27 Washer
2 Washer 28 Nut M4
3 Cylinder Head 29 Snapring
4 Elbow 30 Centrifugal Switch
5 Air Filter 31 Fan
6 Head Gasket 32 Fan Cover
7 Valve Plate 33 Screw M5x12
8 Valve Reed 34 Bolt M5x12
9 Valve Gasket 35 Shroud Cover
10 Cylinder Gasket Upper 36 Left Shroud
11 Cylinder 37 Right Shroud
12 Tooth Washer 38 Bolt ST4.2x16
13 Nut M8 39 Bolt M5x16
14 Running Capacitor 40 Washer
15 Starting Capacitor 41 Bolt ST4.2x25
16 Screw M3x6 42 Regulator
17 Washer 43 Guage 1
18 Motor 44 Guage 2
19 Screw for Crankshaft 45 Safety Valve
20 Crankshaft 46 Unloading Valve
21 Bearing 47 Adapter
22 Screw M6x18 48 Quick Coupler
23 Rod Cover 49 None
24 Piston Ring 50 Pressure Switch
25 Connecting Rod 51 Switch Adapter
26 Screw M4x20 52 Nut G3/8

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53 Switch Gasket 64 Tank
54 Bolt M8x30 65 Rubber Feet
55 Washer 66 Screw M5/12
56 Spring Washer 67 Drain Valve
57 Nut M8 68 Power Plug
58 Check Valve 69 Terminal 1
59 Exhaust Pipe 70 Terminal 2
60 Nut G3/8 71 O Ring
61 Gasket 72 Screw M5x10
62 Unloading Pipe 73 Wire Clip
63 Nut G1/8

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HHC4G User Manual
SECTION 6 - START-UP & OPERATION
INITIAL INSPECTION
All air compressors have been inspected carefully before leaving the factory. It
is possible that poor handling during transport caused some damage to the
compressor. Fully inspect the compressor before use.
1. Inspect the entire unit for any concealed and/or visible damage.
2. Make sure any damaged parts are replaced and any mechanical is-
sues are repaired by a qualied and licensed/certied mechanic.
PRE-START CHECKLIST
1. Make sure that the ON/OFF switch is in the OFF position.
2. Make sure that the tank is fully drained.
3. Make sure that the tank pressure gauge reads 0 PSI.
4. Make sure that the drain valves are closed.
5. Make sure that all covers and safety guards are properly installed and
in place.
INITIAL BREAK-IN PROCEDURE
The following instructions should be followed before the rst time the compres-
sor is operated in order to optimize the life of the compressor and to help
prevent any damage to the unit.
1. Make sure the regulator knob is turned fully counter-clockwise.
2. Plug the power cord into a properly grounded power outlet.
3. Open the drain valve in order to allow air to escape and prevent pres-
sure from building up inside the tank.
4. Turn the ON/OFF switch to the ON position.
5. Allow the compressor to run for approximately 15 minutes.
6. Close the drain valve, allowing pressure to build to the cut-out pres-
sure. The compressor will shut off automatically.
7. Use the compressed air in the tank with an approved attachment or
allow it to bleed out.
START-UP
1. Make sure the regulator knob is turned fully counter-clockwise.
2. Plug the power cord into a properly grounded power outlet.
3. Turn the ON/OFF switch to the ON position.
4. Allow the compressor to reach the cut-out pressure. The compressor

14 HHC4G User Manual
will shut off automatically.
5. Attach a hose and the desired accessory to the unit.
6. Adjust the regulator knob to the desired pressure.
SHUTDOWN
1. Make sure that the ON/OFF switch is in the OFF position.
2. Unplug the power cord from the outlet.
3. Turn regulator knob counter-clockwise until the regulated pressure
gauge reads 0 PSI.
4. Remove the attached hose and accessory.
5. Drain all air and water from the air tank.
6. Once the tank is fully drained, close the drain valve.
7. Store in a safe, dry, non-freezing area.
STORAGE
1. Do not store the compressor in areas that are humid and/or subject to
temperature uctuations. This may result in excess moisture or water
forming in the tank, which may affect the compressors cycle times.
2. Do not store in areas with excessive dust.
3. After the ON/OFF switch is in the OFF position, unplug and properly
store the power cord in a protected and safe position.

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HHC4G User Manual
SECTION 7 - MAINTENANCE
Proper maintenance is important in order to ensure safe, economical, and
trouble-free operation. Improper maintenance may cause the air compressor
to malfunction and can lead to serious injuries or death.
Shut off the compressor before performing any maintenance.
When the engine is running, make sure the area is
well ventilated. The compressed air may contain harmful
vapours or particles.
Use authorized parts or their equivalent. The use of replace-
ment parts which are not equivalent quality may damage the
compressor.
NOTE: Some of these maintenance techniques can be danger-
ous and must be performed by a qualified technician.
In order to maintain high performance and extend the service life of the com-
pressor, periodical inspection and adjustments should be done based on the
following maintenance schedule:
PROCEDURES
DAILY OR
BEFORE
EACH USE
AFTER
EACH USE OTHER
General Inspection X
Drain condensation in
tank(s) X
Check for unusual
noise/vibration X
Check for air leaks X
Check safety relief
valve X
Inspect air lter, replace
if necessary
Approx. every
100 hours
Clean exterior of
compressor X

16 HHC4G User Manual
PROCEDURES
DAILY OR
BEFORE
EACH USE
AFTER
EACH USE OTHER
Oil exposed metal and
moving parts. X
NOTICE:
1. Service more frequently when used in dusty areas.
2. Should be serviced by an authorized service dealer.
3. Must be serviced by an authorized Hyundai Service Dealer. Failure to
do so will void the warranty.

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HHC4G User Manual
SECTION 8 - TROUBLESHOOTING
Many troubleshooting procedures present hazards which can result in
severe personal injury or death. Only trained and experienced service per-
sonnel with knowledge of fuels, electricity, and machinery hazards should
perform service procedures. Review Safety Precautions.
A hot compressor can cause severe burns. Always allow the compressor
set to cool before performing any maintenance service.
PROBLEM CAUSE CORRECTION
Compressor
does not start
• Blown fuse or circuit
breaker tripped
• Loose electrical con-
nections
• Overheated motor
• Check for cause and
replace or reset
• Check wiring con-
nections
• Use reset button
• Wait for automatic
reset
Compressor
does not supply
enough pressure
to operate
• Air leak in safety valve
• Restricted air lter
• Defective check valve
• Check valve manu-
ally – pull upward
on rings. If condition
persists, replace valve
• Clean or replace air
lter
• Replace check valve
Excessive tank
pressure; Safety
relief valve
releasing
• Defective pressure
switch or improper
adjustment
• Check for proper
adjustment and if
problem persists,
replace pressure
switch
Moisture in
discharged com-
pressed air
• Condensation in
air tank caused by
humidity
• Compressor located in
damp or humid area
• Drain tank
• Relocate the com-
pressor
• Purchase In-Line air
lter system

18 HHC4G User Manual
Compressor
does not or is
slow to come up
to speed
• Defective motor or
pump
• Defective pressure
switch
• Use of an extension
cord
• Contact Hyundai
Power Customer
Service
• Replace the pressure
switch
• If possible, eliminate
extension cord
Compressor
runs excessively
hot
• High duty cycles
• Compressor unit can-
not supply enough air
• Extremely dusty atmo-
sphere
• Run compressor for
lighter cycles
• If accessory’s re-
quired CFM is higher
than pressure supply,
larger compressor is
required
• Relocate the com-
pressor
Excessive
noise/vibra-
tion during
operation
• Check valve is loose or
broken
• Defective motor or
pump
• Clean or replace
check valve
• Contact Hyundai
Power Customer
Service
Excessive
starting and
stopping
• Hose, hose connec-
tions, or attached
accessory leaks
• Condensation in air
tank, high humidity
• Fittings are not tight
enough
• Defective pressure
switch
• Rusted or damaged
air tank
• Check for leaks and
replace if necessary
• Drain tank
• Tighten any loose
ttings
• Replace defective
switch
• Replace tank immedi-
ately. Do not attempt
to repair the tank
Air leaks • Fittings not tight
enough
• Air leaks at hose or
accessory
• Rusted or damaged
tank
• Tighten any loose
ttings
• Check for leaks and
replace if necessary
• Replace tank immedi-
ately. Do not attempt
to repair the tank

19
HHC4G User Manual
SECTION 9 - GLOSSARY
CFM – Cubic Feet per Minute
Cut-In Pressure – The tank’s lowest pressure point at which the motor restarts
automatically to build pressure.
Cut-Out Pressure – The tank’s maximum pressure point at which the motor
shuts off automatically.
Cycle – The series of steps that a compressor performs.
Cycle Time – The amount of time for a compressor to complete one cycle.
HP – Horsepower required at the compressor shaft to perform.
PSI – Pounds per Square Inch; A unit of measure of pressure.
Regulator – Device used to change the pressure from the compressor.
SCFM – Standardized Cubic Feet per Minute; a measure of airow

20 HHC4G User Manual
SECTION 10 - WARRANTY
Midland Power Inc.
376 Magnetic Drive, Toronto, Ontario, Canada, M3J 2C4
This product is warranted to be free of defects in materials and workmanship for
one year from the original date of purchase. This limited warranty guarantees
that any defective parts will be repaired or replaced, at the warrantor’s discre-
tion, at no cost, including diagnosis and replacement parts.
1 Year Limited Warranty:
The warranty coverage is continual from the initial date of purchase and does
not restart at anytime under any circumstances. This limited warranty is valid
only when the air compressor receives all necessary preventative maintenance,
as described in the Hyundai Air Compressor User Manual. The repair or
replacement of a compressor will take place within a reasonable period of time
during normal business hours.
All repaired and replacement parts shall be warranted for 90 days after the initial
date of installation or purchase.
Limitations of Remedies and Disclaimers
THE FOREGOING LIMITED WARRANTY IS EXCLUSIVE OF AND IN LIEU OF
ALL OTHER WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICU-
LAR PURPOSE, AND OF ANY OTHER WARRANTY, WHETHER EXPRESSED
OR IMPLIED.
Midland Power Inc. disclaims any responsibility for any indirect, incidental, or
consequential loss or damage caused by any defects in material or workman-
ship.
This limited warranty will be voided if the compressor is used for commercial
purposes.
All expenses incurred in maintaining and replacing parts for the compressor shall
be incurred by the purchaser. This warranty coverage does not include parts af-
fected by accident and/or collision, corrosion or rust, normal wear, use in an ap-
plication for which the product was not intended, service from an unauthorized
service dealer, or any other misuse, neglect, incorporation or use of unsuitable