How JustAnswer Works:

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

Ask Hank F. Your Own Question

Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 13379
Experience:  Certified on Onan and Generac generators
19372534
Type Your Small Engine Question Here...
Hank F. is online now
A new question is answered every 9 seconds

I have a EB3500 honda portable generator. Its started having

Resolved Question:

I have a EB3500 honda portable generator. Its started having power surges. the lights get really bright for 30 to 60 seconds and goes back to normal. The engine does NOT increase RPMs. RPMs stay the same at all times. Can someone help on this problem?
Submitted: 3 years ago.
Category: Small Engine
Expert:  Hank F. replied 3 years ago.

Hello!
Thank you for choosing Just Answer for the solution to your problem.
My name is XXXXX XXXXX I am going to assist you with this.

 

What is the serial number of your genset?

 

Customer: replied 3 years ago.
The serial number of my genset is EA6-3008852. EB3500X
Expert:  Hank F. replied 3 years ago.

Thanks.

I needed this, as there are 4 different schematics for the EB3500, and they are serial number dependent.

 

This is a fairly basic set as far as generators go, and there are not many parts that can go bad.

 

What I need you to do is to connect a voltmeter to the receptacle and monitor the voltage while the set is running.

With a light load on the set, if the voltage is fluctuating more than about 5 volts, but the engine is not changing speed, it would indicate that the AVR is going bad.

 

If the voltage fluctuation is not more than 5V, it may indicate a possible issue in the stator, but this is highly unlikely. Let me know if this is the case.

 

Customer: replied 3 years ago.
My genset has been running for about 10 mins. At start up the voltage was reading 169 to172 volts at the recepticle. After about 10 mins RPMs increased very very slightly and voltage dropped to 118 to 120 volts. After about 30 mins the voltage jumped back up to 169 to 172 with RPMs dropping ever so slightly. And after about 5 to 10 mins the voltage will drop back to 118 to 120.
Expert:  Hank F. replied 3 years ago.

That voltage is way too high.

 

I am very concerned about the fact that the voltage drops when the engine speeds up and rises when the engine slows down - this is just the opposite of what should happen.

 

This is still most likely a bad AVR, but right now what really needs to be done is to measure the output frequency to verify engine speed.

If the engine is not running at the proper speed, it will not do much good to test anything else.

 

Do you have, or have access to, a frequency meter?

 

If the engine speed is what it should be, the AVR needs to be replaced.

If the engine speed is not what it should be, this needs to be taken care of first.

 

Customer: replied 3 years ago.

I don't have a frequency meter. The genset has been running for more than an hour now. the voltage has been staying at 118 to 120. It did that 168 to 172 volts for about 2 mins. But the RPMs did drop ever so, so slightly. It is so slight that you can just bearing hear the difference. I am some what mechanicaly enclined. Maybe the average person may not hear the difference. But the voltage dropped back to 118 to 120. It may do this voltage thing in a 4 to 6 hr. time frame about 3 to 4 times. Where is the AVR on the genset?

Expert:  Hank F. replied 3 years ago.

The 118-120 range is perfectly normal - in fact, maybe just a sliver low if there is no load on the set.

 

The AVR is located under the end cover of the genset.

It is a kidney shaped device with 6 wires going to it.

 

Customer: replied 3 years ago.
Grey colored, looks like a almost half moon, with 3 wires together with a plug at the end. The other 3 wires are independent with single connectors at the end?
Expert:  Hank F. replied 3 years ago.

That's it - the Automatic Voltage Regulator.

 

Hank F., Technician
Category: Small Engine
Satisfied Customers: 13379
Experience: Certified on Onan and Generac generators
Hank F. and 6 other Small Engine Specialists are ready to help you

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. Jimmy Bagley, IA
< Last | Next >
  • 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. Jimmy Bagley, 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
< Last | Next >
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
  • http://ww2.justanswer.com/uploads/SM/SmEngPro/2012-8-5_3564_Rick1206290005Edit.fullres.logo.scrn.64x64.jpg Rick's Avatar

    Rick

    Factory Authorized Trainer

    Satisfied Customers:

    4126
    Outdoor Power Equipment technical trainer since 1990, covering eight states.
  • http://ww2.justanswer.com/uploads/GI/giftindex/2011-11-19_2715_JamesLWells500.64x64.jpg James W's Avatar

    James W

    Small Engine Troubleshooting Expert

    Satisfied Customers:

    2978
    7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
  • http://ww2.justanswer.com/uploads/jonrk/2010-1-5_22551_jon.jpg Jon K.'s Avatar

    Jon K.

    Small Engine Diagnostic Expert

    Satisfied Customers:

    2950
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • http://ww2.justanswer.com/uploads/MR/mr2cycle/2011-3-12_03458_sears.64x64.jpg Vince O.'s Avatar

    Vince O.

    Small Engine Technician

    Satisfied Customers:

    2374
    Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers
  • http://ww2.justanswer.com/uploads/rheisnger/2010-12-31_010856_41385_100001225699183_7012_q.jpg RUSS's Avatar

    RUSS

    SERVICE TECHNICIAN

    Satisfied Customers:

    1723
    28 YEAR SERVICE TECHNICIAN
  • http://ww2.justanswer.com/uploads/BriggsEngines/2010-02-26_230200_n1834842973_4823.jpg CJBennett's Avatar

    CJBennett

    Small Engine Technician

    Satisfied Customers:

    623
    Briggs and Stratton Master Service Tech, Kohler, Tecumseh, Kawasaki certified. 18 years exp.