Predator 58374 Assembly instructions

Using a generator indoors
CAN KILL YOU IN MINUTES.
Generator exhaust contains
carbon monoxide. This is a poison
you cannot see or smell.
NEVER use inside
a home or garage,
EVEN IF doors and
windows are open.
Only use OUTSIDE
and far away from
windows, doors,
and vents. Visit our website at: http://www.harborfreight.com
Email our technical support at: [email protected]
Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the
back of the manual (or month and year of purchase if product has no number). Keep this manual and the
receipt in a safe and dry place for future reference. 22f
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright©2021 by Harbor Freight Tools®. All rights 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 may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
Tools required for assembly and service may not be included.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

Page 2 For technical questions, please call 1-888-866-5797. ITEM 58374
Specifications
Output
120VAC / 60Hz / 50A
6000 Max Running Watts
7500 Max Starting Watts
Outlets NEMA L5-30R, 30A
NEMA 14-50R, 50A
Circuit Breakers 30A and 50A
Note:
1. Actual Running and Starting Watts will depend upon connected generators.
2. 14-50R receptacle is wired for 120V only. 240V loads will not work on this Parallel Kit.
WARNING SYMBOLS AND DEFINITIONS
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that
follow this symbol to avoid possible injury or death.
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Addresses practices not related to personal injury.
Symbol Definitions
Symbol Property or Statement
RPM Revolutions Per Minute
HP Horsepower
WARNING marking concerning
Risk of Eye Injury. Wear ANSI-approved
safety goggles with side shields.
Read the manual before
set-up and/or use.
WARNING marking concerning
Risk of Hearing Loss.
Wear hearing protection.
Symbol Property or Statement
WARNING marking concerning
Risk of Respiratory Injury.
Operate engine OUTSIDE and far away
from windows, doors, and vents.
WARNING marking concerning
Risk of Fire while handling fuel.
Do not smoke while handling fuel.
WARNING marking concerning
Risk of Fire.
Do not refuel while operating.
Keep flammable objects
away from engine.

Page 3For technical questions, please call 1-888-866-5797.ITEM 58374
SAFETYSETUPOPERATIONMAINTENANCE
IMPORTANT SAFETY INSTRUCTIONS
WARNING! Read all instructions.
Failure to follow all instructions listed below may result in fire, serious injury and/or DEATH FROM
ELECTRIC SHOCK.
The warnings and precautions discussed in this manual cannot cover all possible conditions and
situations that may occur. It must be understood by the operator that common sense and caution
are factors which cannot be built into this product, but must be supplied by the operator.
SAVE THESE INSTRUCTIONS
Set Up Precautions
1. Set up and use only on a flat, level,
dry, well-ventilated surface.
2. All connections and conduits from the Generators
to the load must only be installed by trained and
licensed electricians, and in compliance with all
relevant local, state, and federal electrical codes and
standards, and other regulations where applicable.
3. Wear ANSI-approved safety goggles during set up.
4. Inspect thoroughly before each
use. Do not use if damaged.
5. Do not plug more than the specified
number of watts into this cord.
6. Do not run Parallel Kit through doorways,
holes in ceilings, walls or floors.
7. Use two of the same model generator. Do
not use two different generator models.
8. Turn generators off before
connecting the Parallel Kit.
9. Fully insert cable plugs into outlets.
10. Do not remove, bend or modify any metal
prongs or pins of the Parallel Kit.
11. Do not use excessive force to make connections.
12. Keep away from water.
13. Keep Parallel Kit dry and away
from wet ground and mud.
14. Do not drive, drag or place objects
over Parallel Kit Cords.
15. Do not walk on Parallel Kit Cords.
16. Connect Parallel Kit ground wires to
ground stud on generators.
Operating Precautions
TO PREVENT SERIOUS INJURY, DEATH, AND GENERATOR AND/OR
EQUIPMENT DAMAGE FROM ELECTRIC SHOCK AND FIRE:
1. CARBON MONOXIDE HAZARD
Using a generator indoors
CAN KILL YOU IN MINUTES.
Generator exhaust contains
carbon monoxide. This is a poison
you cannot see or smell.
NEVER use inside a home or garage,
EVEN IF doors and windows are open.
Only use OUTSIDE and far away from windows,
doors, and vents.
2. Never use generators indoors, including in
garages, basements, crawl spaces and sheds.
Opening doors and windows or using fans will NOT
prevent carbon monoxide build up in the home.
3. When using generators, keep them outdoors
and far away from open doors, windows,
and vents to avoid toxic levels of carbon
monoxide from building up indoors.
4. If you start to feel sick, dizzy, or weak while
using generators, get to fresh air right away.
The carbon monoxide from generators can
quickly lead to full incapacitation and death.
5. Keep children and pets away from the Parallel
Kit, especially while it is operating.
6. Do not exceed the maximum power rating of the
generators. Make sure that the total electrical rating
of the all of the tools or appliances plugged into
the generators at the same time does not exceed
that of the generator. Check that the startup surge
will not be beyond the limit of the generators.

Page 4 For technical questions, please call 1-888-866-5797. ITEM 58374
SAFETY SETUP OPERATION MAINTENANCE
7. Avoid substantially overloading which will trip
the circuit breaker. Slightly overloading the
generators may not trip the circuit breaker,
but will lead to premature generator failure.
8. Do not attempt to connect or disconnect
load connections while standing in water,
or on wet or soggy ground.
9. Do not touch electrically energized parts of
the generators and interconnecting cables
or conductors with any part of the body, or
with any non-insulated conductive object.
10. Insulate all connections and disconnected wires.
11. Guard against electric shock. Prevent body contact
with grounded surfaces such as pipes,
radiators, ranges, and refrigerators.
12. Only connect two identical Inverter Generators
together using the Parallel Kit.
13. Connect Parallel Kit only to terminals marked
“Parallel Outlets” on the front of the generator.
14. Do not remove or connect Parallel Kit
while generators are running.
15. Do not attach a Parallel Kit to only one generator.
16. Do not attach a heavy load to any other outlet on
a Generator that has a Parallel Kit attached.
17. Wear ANSI-approved safety glasses during use.
18. People with pacemakers should consult their
physician(s) before use. Electromagnetic fields in
close proximity to a heart pacemaker could cause
pacemaker interference or pacemaker failure.
Caution is necessary when near the
engine’s magneto or recoil starter.
19. Use only accessories that are recommended
by Harbor Freight Tools for your model.
Accessories that may be suitable for one
piece of equipment may become hazardous
when used on another piece of equipment.
20. Stay alert, watch what you are doing and use
common sense when operating this parallel
kit. Do not use while tired or under the
influence of drugs, alcohol or medication.
21. Dress properly. Do not wear loose clothing or
jewelry. Keep hair, clothing and gloves away
from moving parts. Loose clothes, jewelry or
long hair can be caught in moving parts.
22. Use the equipment, accessories, etc., in
accordance with these instructions and in the
manner intended for the particular type of
equipment, taking into account the working
conditions and the work to be performed.
Use of the equipment for operations different from
those intended could result in a hazardous situation.
23. Before use, check for misalignment or binding of
moving parts, breakage of parts, and any other
condition that may affect the equipment’s operation.
If damaged, have the equipment serviced
before using. Many accidents are caused
by poorly maintained equipment.
24. Use the correct equipment for the application.
Do not modify the equipment and do not use the
equipment for a purpose for which it is not intended.
25. Extension Cord - Make sure your extension cord is
in good condition. When using an extension cord, be
sure to use one heavy enough to carry the current
your product will draw. An undersized extension
cord will cause a drop in line voltage resulting in loss
of power and overheating.
The table below shows the correct cord size to use
depending on cord length and nameplate ampere
rating. If in doubt, use the next heavier gauge.
The smaller the gauge number, the heavier the cord.
RECOMMENDED MINIMUM WIRE GAUGE FOR EXTENSION CORDS
CURRENT
(AMPS)
Load @
120V
(WATTS)
0 ~ 50 ft 50 ~ 75 ft 75 ~ 100 ft
2 240 18 AWG
4 480 18 AWG 16 AWG
6 720 18 AWG 16 AWG 14 AWG
8 960 16 AWG 12 AWG
10 1200 16 AWG 14 AWG 12 AWG
15 1800 14 AWG 12 AWG 10 AWG
20 2400 12 AWG 10 AWG
25 3000 12 AWG 10 AWG 8 AWG
30 3600 10 AWG 8 AWG
35 4200 8 AWG 6 AWG
40 4800 6 AWG
Operating Precautions (cont.)

Page 5For technical questions, please call 1-888-866-5797.ITEM 58374
SAFETYSETUPOPERATIONMAINTENANCE
Service Precautions
1. Before service, maintenance, or cleaning,
unplug the Parallel Kit from both generators.
2. Keep all electrical equipment clean and dry.
Replace any wiring where the insulation is
cracked, cut, abraded, or otherwise degraded.
Replace terminals that are worn, discolored, or
corroded. Keep terminals clean and tight.
3. Do not alter or adjust any part of the
equipment or its engine that is sealed by the
manufacturer or distributor. Only a qualified
service technician may adjust parts that may
increase or decrease governed engine speed.
4. Wear ANSI-approved safety goggles during service.
5. Maintain labels and nameplates on the equipment.
These carry important information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
6. Have the equipment serviced by a qualified repair
person using only identical replacement parts.
This will ensure that the safety of the equipment
is maintained. Do not attempt any service or
maintenance procedures not explained in this
manual or any procedures that you are uncertain
about your ability to perform safely or correctly.
7. Store equipment out of the reach of children.
SAVE THESE INSTRUCTIONS.
Set Up
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.
1. Inspect the Parallel Kit and generators for damaged,
loose, and missing parts before set up and starting.
If any problems are found, do not use
equipment until fixed properly.
2. Add fuel and oil to the generators according
to the instructions in the generator manual.
3. Set up the Parallel Kit either on the ground
or clipped to one of the two generators.
4. Connect the Red Connectors to the red
parallel outlets on both generators.
Note: If both parallel outlets on the generator control
panels are black, then the Parallel Kit leads can be
connected without the need for color matching.
5. Connect the Black Connectors to the black
parallel outlets on both generators.
6. Connect the Grounding Connectors (rings) to
the Grounding Terminals on both generators.
Tighten the grounding screw securely.
Note: The Parallel Kit is Neutral Floating.
However, final status of neutral wire will
be that of the connected generator.
7. Make sure the 50A Circuit Breaker is set to ON.
Components and Controls
NEMA
L5-30R
Outlet
NEMA
14-50R
Outlet
(120V output only)
Red
Black
Ground (ring)
Connectors:
30A
Breaker
50A
Breaker

Page 6 For technical questions, please call 1-888-866-5797. ITEM 58374
SAFETY SETUP OPERATION MAINTENANCE
Operation
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.
Note: Position the generators as far from each other
as possible to avoid hot air circulation and false
triggering of carbon monoxide sensors (if applicable).
1. Turn on one generator, then the second.
2. Check that the Output lights of
both generators are green.
3. Attach load to Parallel Kit.
Note: If high electrical loads are connected, keep
the ESC Throttle OFF to reduce voltage changes.
4. If one generator shuts off during use,
disconnect load until it can be restarted
to avoid generator damage.
Note: Do not overload the generators. Substantial
overloading will shut off the AC output and may
shorten the service life of the generators.
Maintenance
WARNING
TO PREVENT SERIOUS INJURY FROM EQUIPMENT FAILURE:
Do not use damaged equipment. If abnormal noise, vibration, or excess
smoking occurs, have the problem corrected before further use.
Procedures not specifically explained in this manual
must be performed only by a qualified technician.
1. BEFORE EACH USE, inspect the general
condition of the kit. Check for:
• loose hardware,
• cracked or broken parts,
• damaged electrical wiring or
cable insulation, and
• any other condition that may
affect its safe operation.
2. After Use, wipe external surfaces
of the kit with clean cloth.
Troubleshooting
Problem Possible Causes Probable Solutions
Parallel Kit doesn’t
have power
1. Device not plugged in properly.
2. Circuit Breaker tripped.
3. Parallel Kit needs service.
1. Turn off generator and check
outlet connections for correct
positioning. Restart generator.
2. Turn off and unplug Parallel Kit,
reset Circuit Breaker, plug in
Parallel Kit and turn on.
3. Have Parallel Kit repaired.
Overload indicator
flashes
Rated load capacity exceeded. Lower the number of items plugged into the
generator to stay within the rated capacity.
Follow all safety precautions whenever diagnosing or servicing the Parallel Kit.

Page 7For technical questions, please call 1-888-866-5797.ITEM 58374
SAFETYSETUPOPERATIONMAINTENANCE
Parts List and Diagram
Part Description Qty.
1 50A Parallel Kit 1
2 Breaker, 50A 1
3 Breaker, 30A 1
4 Outlet, Nema L5-30, 30A, 125V 1
5 Screw, PT4 x 13 4
6 Outlet, Nema 14-50R,
50A, 125V/250V
1
7 Cover, L5-30R 1
8 Cover, 14-50R 1
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 purposes only, and are not
available individually as replacement parts.
Specify UPC 193175438034 when ordering parts.
5

26677 Agoura Rd • Calabasas, CA 91302 • 1-888-866-5797
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR
MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS
QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE
ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY
STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND
LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY
ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS
THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Limited 90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards,
and warrants to the original purchaser that this product is free from defects in materials and workmanship for the
period of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly,
to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper
installation, normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, injuries
to persons or property, or for incidental, contingent, special or consequential damages arising from the use of
our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation charges
prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise.
If our inspection verifies the defect, we will either repair or replace the product at our election or we may
elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will
return repaired products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.