Small Engine

Small Engine Troubleshooting Problems? Ask a Mechanic Now.

Ask an Expert,
Get an Answer ASAP!

I have a 6 year old 45KW Generac natural gas genset that…

Customer Question
I have a 6 year...
I have a 6 year old 45KW Generac natural gas genset that starts and immediately shuts down. The control panel light for overspeed is one.
We changed the sensor that detects the rpms of the flywheel and the other similar sensor and the circuit board too. Nothing worked to fix it. We also changed the natural gas pressure gauge on the feed line for the natural gas.
The highspeed light is still on and the unit shuts down. It has proper water and oil in it to the correct levels.
Any suggestions. Thanks, Mark
Submitted: 2 years ago.Category: Small Engine
Show More
Show Less
Ask Your Own Small Engine Question
Answered in 1 day by:
1/29/2016
Technician: Pete, Technician replied 2 years ago
Pete
Pete, Technician
Category: Small Engine
Satisfied Customers: 33,353
Experience: 17 years automotive training and experience.
Verified

My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.

Inspect for any damaged wiring on the generator that may be causing this fault here.I have seen in some cases where damaged wiring can cause this type of fault here needing repaired to correct this issue.If this has already been checked and found to be o.k. let me know so we can continue.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
Pete,I have our techs working on it. They do all our electrical at my chemical plant and installed three large Generacs for us here at our plant. My personal unit is somewhat of a conundrum. They were on the phone with Generac twice and still cant figure it out. The magneto over the flywheel is good and the cam one is good. They found some water in the wiring somewhere and dried that out. They changed the control board to no avail. I had read the stator and or rotar may be messed up. They are getting with some pros in Houston they know to try and figure it out. Thanks, Mark
Technician: Pete, Technician replied 2 years ago

O.k.,the water may have left corrosion.If you have not checked for any wiring corrosion or terminal connection corrosion with the wiring this should be done and if an issue is found the wiring or terminals may need replaced to correct this here.If this is checked and found to be o.k. let me know.

Thanks Pete

Ask Your Own Small Engine Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Pete Your Own Question
Pete
Pete
Pete, Technician
Category: Small Engine
Satisfied Customers: 33,353
33,353 Satisfied Customers
Experience: 17 years automotive training and experience.

Pete is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Technician

15,517 satisfied customers

have worked on and around most engine models for 35 yrs./Polaris ATV expert

Rick

Rick

Factory Authorized Trainer

4,218 satisfied customers

Outdoor Power Equipment technical trainer since 1990, covering eight states.

Jon K.

Jon K.

Small Engine Diagnostic Expert

2,995 satisfied customers

Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines

James W

James W

Small Engine Troubleshooting Expert

2,986 satisfied customers

7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years

Vince O.

Vince O.

Small Engine Technician

2,927 satisfied customers

Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers

Wayne

Wayne

Engine Rebuilder

2,041 satisfied customers

many years on egine rebuilding, lawn mower,roto tiller,Truck,and small engines

RUSS

RUSS

SERVICE TECHNICIAN

1,723 satisfied customers

28 YEAR SERVICE TECHNICIAN

< Previous | Next >

Related Small Engine Questions
I changed the oil, oil filter, spark plugs, and air filter
I changed the oil, oil filter, spark plugs, and air filter on my generac 10kw standby generator and now it will not stay running. It runs off natural gas. … read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
I have a Generac 04109 8Kw. Started it up last night and it
I have a Generac 04109 8Kw. Started it up last night and it ran for about five minutes, then shut down. I think the overtemp light came on. It has oil. Any ideas? … read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
My generac generator stops afer a few seconds (about 15
hi. My generac generator stops afer a few seconds (about 15 seconds) and flashs the "overspeed" LED light on the controls. … read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
I have a generac guardian 18k wi=ont start and reads
i have a generac guardian 18k wi=ont start and reads overspeed … read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
I have a generac guardian standby natural gas generator and
HELLO, I have a generac guardian standby natural gas generator and it tests its self every week , This part week it started and shut down after a few seconds . I changed the oil and filter and no luck… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
My mother has a generac whole house generator. I think it is
My mother has a generac whole house generator. I think it is a 15kw, runs on natural gas. Allways maintained by myself. It exercised once a week all the time. The last time it ran, our neighbor notice… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
Hi, Hank, I have a question about a Generac 20 kW generator.
Hi, Hank, I have a question about a Generac 20 kW generator. I installed solar panels, etc. for a friend who lives off grid. He purchased a Generac 20 kW generator and is running it on propane. I wire… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
I have a Generac Guardian Plus 7kw generator powered by natural
I have a Generac Guardian Plus 7kw generator powered by natural gas. When set to exercise on regular intervals, it doesn't shut down after the alotted tome. Also, when it isn't running, there is an od… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
I have a back up generator with Guardian GH-410 engine. Recently
I have a back up generator with Guardian GH-410 engine. Recently it began giving me trouble. It starts right up but runs at low RPM, won't get up to speed then shuts down after about 10sec. It tries t… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
I have an HGJAD fuel injected portable generator that is cutting
I have an HGJAD fuel injected portable generator that is cutting off sporadically. Every thirty minutes to every couple of hours. The Service code is "31" which the operator manual list as overspeed s… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
I just purchased a Generac 055360 12KW generator with the 990V-twin
I just purchased a Generac 055360 12KW generator with the 990V-twin running on LP or Natural gas. It was Alarm Coding RPM Sensor Loss. It doesn't have a stator under the flywheel. How does it sense RP… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
Generac generator shows overspeed fault, but does not show
generac generator shows overspeed fault, but does not show it when set to manual and circuit breaker switched to off.… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
My 15kw Generac starts, runs for 2-3 seconds and shuts down
My 15kw Generac starts, runs for 2-3 seconds and shuts down and overspeed light comes on although the genny does not noticably speed up.This is a long standing problem. Replaced the board but same. Th… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
Hello, I have a generac model 04389-1 with an over speed light
Hello, I have a generac model 04389-1 with an over speed light on start-up. What is the repair procedure?… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
Both my neighbor & I installed an 8KW Guardian generator 3
Both my neighbor & I installed an 8KW Guardian generator 3 weeks ago My neighbor experienced an overspeed alarm after the initial installation three weeks ago. On his automatic weekly start last satur… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
my 7.5w generac began shutting down during the exercise cycle
my 7.5w generac began shutting down during the exercise cycle about two months ago. Lil filters and plugs are changed annually. The red codes were highspeed and overheating. A local dealer adgusted th… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
I have a 15K Natural Gas Generac BU Generator... The overspeed
I have a 15K Natural Gas Generac BU Generator... The overspeed light comes on during the self-test cycle, when the ambient temperature falls below ~40 deg. In the summer, it's fine. I can run the gene… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
I have a Generac 10kw Centurion automatic generator. With the
I have a Generac 10kw Centurion automatic generator. With the snow came a power outage and the generator came on and ran for 4 hours and then died showing an "overspeed" error. I tried to restart it a… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x