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Predator 4375 - 3500/4375W Portable Generator

The Predator 4375 (59132) is a compact open frame generator with a rated wattage of 3500 W and a starting wattage of 4375 W.

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Predator 4375Predator 4375Predator 4375
Even though the pictures on this product page show wheels, Predator generators sold at Harbor Freight do not come with a wheel kit. It must be purchased separately.
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Description

Powered by a dependable 212cc PREDATOR® gas engine, this generator is compact, lightweight, and provides power wherever it's needed.

Zoom on the Predator 4375

In a nutshell, the Predator 4375 is a compact portable generator mostly geared towards:

  • RV travellers who wish to upgrade their experience to another level
  • People occasionally participating in sporting competitions, open-air performances and outdoor festivals
  • DIYers who wish to improve their efficiency with tools
  • Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
  • Professionals in need of safely powering high-intensity work or lighting equipment

In the sections ahead, the power characteristics, availability of various outlets, the portability, and any additional features of the device shall be discussed, including its emission compliance information.

Power & Run Time

The Predator 4375 in use

The Predator 4375

The Predator 4375's engine, 212 cc (6.5 hp) OHV 4-stroke, fueled by gasoline, can deliver 120/240V. It provides a running wattage of 3500W and reaches a peak wattage of 4375W.

With a noise rating of 72 dBA (just slightly more noisy than a dishwasher), the generator features a simple traditional pull-start mechanism.

Thanks to a fuel capacity of 4.8 gallons, the 4375 can operate for around 16 hours at 50% load with a full tank (fuel consumption around 0.3 GPH).

Outlets

The control panel includes the following 5 AC outlets:

Two Duplexes 120V 20A (5-20R) GFCI
120/240V 30A (L14-30R) receptacle

In addition, it provides 1 DC outlet: there's a 12V 8A (cigarette lighter style) receptacle with which you may charge your batteries with ease.

Due to the featured twist-lock L14-30R receptacle, the 4375 is transfer switch ready: you may connect it to a breaker box to power your household during a power outage.

Portability

The dimensions of the Predator 4375, which are L23.3 x W18.7 x H19.3 in, and its typical, open frame design provides stability and enables the generator to be raised above ground level. This type of design is ideal for tough environments and heavy outdoor use.

Although this generator is technically considered 'portable' (in the sense that it can be moved), its 105 lbs make it incredibly difficult to manually lift and transport. However, its challenging mobility is solved by a wheel kit (separate purchase), which will ease its displacement, once it is on the floor.

Features

Panel of the Predator 4375

The 4375's control panel

A light indicator allows you to instantly see if the oil level is too low.

The generator includes a built-in fuel gauge, a quick, easy and convenient method of checking the device’s gas level.

As far as security is concerned, the generator can be used with a peace of mind, as it features an automatic low oil shut-off and an overload protection (circuit breaker).

The unit also benefits from the Predator's CO SECURE™ carbon monoxide detection. This system monitors the accumulation of CO gas while the generator is running and will shut off the engine if the levels become dangerously high. It’s a welcomed additional security feature, but don’t forget to always take your generator outside (opens in a new tab).

Besides the usual set of documentation and owner's manual (opens in a new tab) to get you promptly started, Predator also included a tool kit in the 4375's packaging.

Emissions

The Predator 4375 is EPA-approved and CARB-compliant. It can therefore be sold and purchased in all 50 states, including California.

Moreover, it features a spark arrestor, making it usable in forested areas.

The unit also meets the ANSI/PGMA G300-2018 safety and performance requirements.

The Predator 4375 versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Predator 4375 compare to generators of similar power (between 3000 and 4000 W).

  • Having a dry weight of 105 lbs, the Predator 4375 belongs in the expected weight range for generators which produce 3000 to 4000 rated watts. If weight matters to you, one of the champions in this power range is the Genmax GM3300i with only 47.4 pounds.
  • When compared to devices able to produce a similar running wattage, this generator and its lowest emitted noise of 72 dBA is on the noisier side. If you’d prefer a less noisy device, one of the most quiet devices, which share the same power range with this one, is the Cummins Onan P4500i, whose lowest noise levels reach just 52 dBA.
  • As the 4375 features an autonomy of around 16 hours at 50% load, it has one of the highest run times in comparison to the other generators of its power range.
  • Autonomy holds its importance, however, it is largely dependent on the generator’s fuel capacity and so, it is nonsensible to discuss it without mentioning fuel efficiency as well. This generator, with an estimated fuel consumption of just 0.3 GPH (gallon per hour) at 50% load, is one of the more fuel efficient generators, for the previously mentioned wattage range. If you wish to acquire one of the most gasoline efficient products of this power range, the Genmax GM3300i, with a fuel consumption of 0.22 GPH could be in your good books.

Price comparison

As you can see from this interactive chart, when compared to other 3000-4000W generators, the Predator 4375 is on the average side of the price range.

Therefore, this generator nicely fits in the expected budget for this kind of product.

The bottom line

STRENGTHS:
  • In the expected price range
  • CO SECURE™ technology
  • GFCI Outlets
  • High run time
  • Fuel efficient
AVERAGE SPECS:
  • Decent weight (105 lbs)
WEAKNESSES:
  • No data center
  • No electric start
  • Wheel kit not included
  • Weak warranty
  • On the noisy side (72 dBA)

Do you own the Predator 4375 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterNo
PortableYes
Parallel capableNo
RV readyNo
FuelGasoline
Engine212 cc OHV 4-stroke
Starting systemRecoil
Power
VoltageAC: 120/240V 60 Hz, DC: 12V
Running watts3500 W
Starting watts4375 W
Running amps (@120/240V)29.2/14.6 amps
Peak amps (@120/240V)36.5/18.2 amps
Run time @50% load16 h
Run time @25% loadUnknown
Features
GFCI outletsYes
Covered outletsYes
Automatic Voltage RegulationYes
AC outlets
  • 2x Duplex 120V 20A (5-20R) GFCI
  • 1x 120/240V 30A (L14-30R)
DC outlets1x 12V 8A (cigarette lighter style)
Data centerNo
IndicatorsLow oil
Fuel tank4.8 gal
Fuel gaugeYes
Misc
Weight105 lbs
Approx. dimensions (L x W x H)23.3 x 18.7 x 19.3 in
Noise (lower limit)72 dBA
THDUnknown
ComplianceCARB, EPA, ANSI/PGMA G300-2018
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralBonded to frame
Accessories includedTool kit
Warranty90 days
Other model numbers59132

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

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About Predator

Predator portable generators are solely distributed by the Harbor Freight Corporation, which has an impressive list of over 200 trademarked products. The Predator brand is one of their newer lines of outdoor power products. As with many other makes and models of power equipment sold by Harbor Freight, Predator generators are manufactured in China.

Warranty Information

The Predator 4375 is covered under a warranty for up to 90 days. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Predator generators, please consult Harbor Freight's warranty policies stated in the user manual (opens in a new tab). Alternatively, you can also contact their Customer Support : 1-800-444-3353.

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator sizer.
ItemRunning WattsStarting Watts
At homeElectric fry pan15001500
Sump pump (1/2 hp)10502150
Refrigerator (energy star)1921192
Set of 5 LED light bulbs5555
Total2797 W3897 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Electric fry pan15001500
Radio100100
Total2790 W3380 W
For workGrinder14002500
Demolition hammer12601260
Bug zapper8080
Total2740 W3840 W
Does this generator have an inverter? (Asked June 10, 2020)

This unit is not an inverter generator.

how do i change the oil (Asked August 21, 2020)

Oil change procedure is detailed page 18 of the owner's manual (opens in a new tab).

What spark should I use and what is the gap setting (Asked August 23, 2020)

Spark plug type is NHSP/Torch F6TC. Gap setting is 0.027" – 0.031".

What kind of oil (Asked August 28, 2020)

Recommended engine oil is SAE 10W – 30 above 32° F, and SAE 5W – 30 at 32° F or below

What grade of gas? (Asked September 08, 2020)

Recommended gas is 87 octane or higher unleaded gasoline that has been treated with a fuel stabilizer additive.

Do you have to ground this generator predator 4375 (Asked September 08, 2020)

It is always safer to ground your generator.

Can I connect my RV 30 amp cord into the 120/240V 30A (L14-30R) receptacle? The panel says 15A max??? (Asked October 10, 2020)

You absolutely can. You just won't pull more than 15A amps out of it.

Can the 4375 be connected directly to the my homes' main panel box? (Asked October 17, 2020)

It can be connected to a transfer switch. Note that this connection should be made by a licensed electrician.

How much oil does the Predator 4375 hold? I cannot find that info anywhere. (Asked November 01, 2020)

Engine oil capacity is 0.6 quarts.

Can the generator be ran in snowy conditions (Asked February 15, 2021)

Please refer to our article on operating a generator in bad weather.

My question concerns the 240 volt outlet total amperage output. It lists here at (1x 120/240V 30A (L14-30R). So I take this to mean 30 amps even though the label painted on the side says 15 amps maximum. 30 amps would make sense as its combining both of the 15 amp 120 volt circuits. The 4375, the 6500, and the Predator 9000 all list identical outputs in the descriptions but on the unit they differ. So just trying to confirm total amp output as I plan on hooking up to the house panel. (Asked February 17, 2021)

It means that the outlet is 30 amps, as per its NEMA nomenclature (L14-30R). For the Predator 4375, this outlet won't output more than 15 amp. 15A x 240V = 3600W.

What are the valve gaps set at (Asked March 09, 2021)

Intake 0.004" – 0.006", Exhaust 0.006" – 0.008"

What’s the wiring look like mine came undone need to wire the start Hutton back up (Asked August 19, 2021)

The wiring diagram can be obtained through Harbor Freight's Customer Service: 1-800-444-3353.

Is the 240 outlet GFI protected (Asked September 06, 2021)

Only the two 5-20R duplexes are GFCI protected.

Does this unit require a battery? (Asked October 01, 2021)

The unit does not require a battery.

What is gas mix oil ratio for predator generator (Asked October 30, 2021)

The engine is 4-cycle, so do not mix gasoline with oil.

Where do I go for spare parts? I need a new starter pull cord assy. (Asked March 15, 2022)

Replacement parts can be ordered directly from Harbor Freight: 1-800-444-3353.

Couldn't find the right answer for you? Ask your own question.

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Predator 4375
7.4 Total Score
8 reviews
Add your review
Price
7.9
Value
8
Quality
7.5
Performance
6.3

User Reviews

Most Recent Most Helpful Highest Rating Lowest Rating Add your review
  1. Avatar
    Christina Lovley May 26, 2022 at 9:27 pm
    4.9
    Price
    90
    Value
    100
    Quality
    100
    Performance
    100

    4375 a real power house in Disguise

    + PROS:
    • We have tasked the predator 4375 to the max and it is still powering our camp and has over 4500 hours on it! The fuel consumption was on point right on 14-16hr in the beginning, but after a issue with the carburetor coming loose and engine leaning out and screaming wide open the fuel consumption has been amazing! I don't know how the engine didn't blow up but we now use about half the fuel and at full load! We run the refrigerator,air conditioner(never shuts off) all the camps lights plus 6 500w halogen work lamps all night to illuminate the yard. Plus skillsaws chop saws and aircompressors! You would think it was the 8750 not the 4375!
    - CONS:
    • A little noisy
    Helpful(0) Unhelpful(0)You have already voted this
  2. 2.4
    Price
    60
    Value
    60
    Quality
    30
    Performance
    40

    No excuse the Total Harmonic Distortion (THD) is not posted. Very important for not trashing some sensitive electronics.

    + PROS:
    • Cost
    - CONS:
    • Total Harmonic Distortion
    Helpful(0) Unhelpful(0)You have already voted this
  3. 2.75
    Price
    70
    Value
    70
    Quality
    70
    Performance
    10

    Mine only lasted me one year and 2 weeks then engine locked up

    + PROS:
    • Loved it , bought it August 28 of 2020
    - CONS:
    • Engine locked up on September 22 of 2021, need to get it replaced how can I do this still looks brand new
    Helpful(1) Unhelpful(1)You have already voted this
  4. 5
    Price
    100
    Value
    100
    Quality
    100
    Performance
    100

    Ran our home during a 4~ day outage. Used the HF 50’ generator cable with it. Ran our fridge, all lights, 10k BTU AC, multiple fans and more with ease. Very good on gas. Noise isn’t bad at all. Sounds like every other generator I’ve ever heard.

    I live in a neighborhood, if my neighbors are bothered by the noise, they can chip in. Can’t even hear this generator on my back deck while inside with the doors shut.

    Really should come with the wheel kit as the photos advertise it with it.

    + PROS:
    • Great value.
    • Long runtime.
    • Easy to start.
    • Not louder than any other generator I’ve ever heard.
    - CONS:
    • Really needs wheel kit. Oil fill in poor location.
    Helpful(3) Unhelpful(0)You have already voted this
  5. 2.9
    Price
    70
    Value
    70
    Quality
    70
    Performance
    20

    Gfi outlets trip continuously while running only 7 amps!! Cannot replace existing 110 ac gfi outlets on the control panel. I have an 1800 Ironton generator that will run the same 7 amp equipment all day long!! I would not recommend purchasing a predator 4375 Generator!!

    + PROS:
    • Starts easily, quite,runs great
    - CONS:
    • Gfi trips
    Helpful(3) Unhelpful(0)You have already voted this
  6. 4.15
    Price
    90
    Value
    90
    Quality
    70
    Performance
    80

    Bought the generator as a backup power source for our home. Had to buy a wheel kit, but it was easy to install. Wished it had a data center, but I bought one via AMAZON. Hooked the generator to the house panel after having the panel fitted for it. The generator works perfectly in powering everything except the central air, it would power the central heat though. Overall…very happy with the purchase!

    + PROS:
    • Powers tho home via electrical panel
    • Value
    • Easy setup
    • Easy start
    • Portability
    - CONS:
    • Loud, even for a generator
    • No data center
    • No outlet covers
    • No wheel kit
    Helpful(3) Unhelpful(0)You have already voted this
  7. 4.5
    Price
    100
    Value
    100
    Quality
    90
    Performance
    70

    I bought the generator wheel kit. I watched a video about the generator. In the video, the man said he’d originally put the wheel mounts on backwards. I looked at the instructions. I tried to determine how to attach the wheel mounts. The kit didn’t come with the correct washers. I couldn’t attach the mounts with the provided washers. I wanted to put washers on both sides of the wheels. That’s what the directions show. I have lots of spare nuts, washers, etc. Unfortunately, didn’t have what was necessary. I had to make a run to the hardware store.
    I agree that the oil fill is in a poor location. The generator seems well built. Hopefully, I’ll get many years of use out of it.

    + PROS:
    • Will power a reasonable load.
    - CONS:
    • Doesn't come with a wheel package included. Oil fill is rather inconvenient. Could be a little quieter.
    Helpful(11) Unhelpful(1)You have already voted this
  8. 3.15
    Price
    50
    Value
    50
    Quality
    70
    Performance
    80

    Love this product, always wanted to own. Generator and this one was perfect for the price and accessibility.

    + PROS:
    • compact, with wheel cart easily movable, price was good.
    - CONS:
    • loud (being a generator and all), have to buy the other accessories including a grounding wire.
    Helpful(8) Unhelpful(6)You have already voted this

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