Construction and Road Equipment

Construction and road equipment repair questions? Ask a mechanic ASAP

Ask an Expert,
Get an Answer ASAP!

I need help to troubleshoot a Deere excavator 350G no

Customer Question
Hello I need help...

Hello I need help to troubleshoot a john Deere excavator 350G no hydraulic functions and no drive, engine starts and runs ok

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Equipment Mechanic I'm going to connect you with knows all the tricks and shortcuts.

Need help to troubleshoot hydraulic issue on 350g excavator

Mechanic's Assistant: Are you fixing this yourself? What have you tried so far?

Yes, I checked pilot pressure which is fine but I don't have main pressure in either hydraulic pump

Mechanic's Assistant: Anything else you want the agriculture mechanic to know before I connect you?

It's ok

Submitted: 6 months ago.Category: Construction and Road Equipment
Show More
Show Less
Ask Your Own Construction and Road Equipment Question
Answered in 2 hours by:
1/5/2018
Mechanic: Dan, Technician replied 6 months ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 6,797
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
Verified

Hi ,My name is***** will be glad to help. We can follow up as needed on here, Please post your serial number and give me some time to review your information and post my responses. Im not an employee of the site but I help on here as time allows in between jobs. Response time will vary depending on my work load , etc.

Ask Your Own Construction and Road Equipment Question
Mechanic: Dan, Technician replied 6 months ago

First check the in tank return filter for fine metal/debris that would confirm a pump failure has occurred. It will look like metallic glitter in the oil and filter. If found the entire system will need to be cleaned out and flushed before a new pump can be run on the machine. Check the pump drive coupling for problem a as well. Let me know

Please take a moment to rate as that is how the site credits my time helping on the site or let me know if you need more help. 5 star and bonuses are always greatly appreciated.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 months ago
Hey Dan thank you for your reply. Now if the pilot pressure is fine that will tell me that the coupling is fine doesn't it? Now this machine has to hydraulic pumps beside the pilot pump, none of them build pressure, can both fail?
Mechanic: Dan, Technician replied 6 months ago

They can as if one started to fail producing metal and once the system was contaminated the othe pump failed and possible other components

Ask Your Own Construction and Road Equipment Question
Mechanic: Dan, Technician replied 6 months ago

Is the pilot safety lever, switch, solenoid valve working on the LH console?

Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 months ago
I checked that, the pilot solenoid under the cab gets energized and the pressure flows ok
Customer reply replied 6 months ago
I'd like to know if those main pumps should constantly be pumping oil every time engine runs or their output is variable and controlled by other kind of features
Mechanic: Dan, Technician replied 6 months ago

They are variable displacement pumps that flow varies on demand to the pump control servos controlling the swash plate angle and flow.

Ask Your Own Construction and Road Equipment Question
Mechanic: Dan, Technician replied 6 months ago

Hi, How are you making out with this? Save yourself a lot of hassle by checking that in tank return filter like I suggested. If it looks like glitter the main pumps are bad. I worked for Nortrax, Cat, Komatsu, volvo in the past before going independent. Let me know.

Please take a moment to rate as that is how the site credits my time helping on the site or let me know if you need more help. 5 star and bonuses are always greatly appreciated.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 months ago
ok, I checked the filter is clean hydraulic oil is clean, so I'd like to know how I can check the two main pump pressure, and what the spec is when engine is just idling. what the pilot pressure should be?
thn
Mechanic: Dan, Technician replied 6 months ago

Hi, Sorry for the delay. I was called out and dealing with the storms on the east coast. I do not have the actual specs on hand but pilot pressure usually runs between 550-600 PSI range and the mains are going to be closer to around 5000-6000 range if teed in and pump output will not see that in neutral as the pump should be in neutral as far as main pressure but pilot pressure should remain on standby.... Click on this link. Go to around 87 or so on the PDF page not manual page and check in the monitor for fault codes and also check the settings. We want to be sure someone did not mess the monitor panel settings causing your trouble....

Manual

Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 months ago
Hi Dan I teed the line out of pilot pump and pressure is within spec and as I said previously pilot switch is ok but I cant check the main pumps pressure, can that reading be obtained electronically from the monitor? what I did I disconnected a high pressure fitting and it barely pours oil out so I don't have main pressure but I cant go further with troubleshooting here as I don't know what is the main pumps pressure at idle with no load and how can I by pass pilot pressure just to see if the pumps are ok coze neither has pressure
thnx
Mechanic: Dan, Technician replied 6 months ago

You should be able to get into your pressures from the monitor panel. I have not pulled them from the G series from the monitor as I have not had to so I do not have the access procedure off the top of my head unfortunately other than attachment setup but was long ago. Scroll through to see if it will pull up and if not I can check Monday to see if I can get the procedure on it. Run through the operators manual on the monitor section in the meantime. Are there any fault codes?

Ask Your Own Construction and Road Equipment Question
Customer reply replied 6 months ago
no trouble codes and I can't get to any screen that will show me live data
Mechanic: Dan, Technician replied 6 months ago

Thanks for the update. I will need to either see what I can gather tomorrow on this or I can opt out as well in case someone else has the procedure for your monitor panel before hand.... Let me know

Ask Your Own Construction and Road Equipment Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Dan Your Own Question
Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 6,797
6,797 Satisfied Customers
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.

Dan 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:

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

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Technician

1,409 satisfied customers

Technican turned service manager with multiple lines of equipment and rental units.

Wayne

Wayne

Journeyman

650 satisfied customers

worked on many road graders, Bull dozers , skid steers, Rollers

Cat Man

Cat Man

Cat Engine Expert

517 satisfied customers

I am ASE Master Certified.

dieseldan55

dieseldan55

Mechanic

273 satisfied customers

Road Mechanic for Volvo Construction Equipment.

Chris (aka- Moose)

Chris (aka- Moose)

Technician

42 satisfied customers

16 years of experience

Steve

Steve

Mechanic

42 satisfied customers

Heavy Equipment Mechanic for 25 years

JBFixxer

JBFixxer

Mechanic

20 satisfied customers

16+ years experience, hydraulics,hydrostatics, engines, fuel injection systems. And everything in between.

< Previous | Next >

Related Construction and Road Equipment Questions
I have an older Hitachi EX60 URG. Excavator. I was using it
I have an older Hitachi EX60 URG. Excavator. I was using it and it was cold outside. The controls started jumping when I was operating it. Then the hydraulics just stopped working. The blade will stil… read more
Dan
Dan
Technician
6,797 satisfied customers
I have a Koerhing excavator #6633 that has lost about half
I have a Koerhing excavator #6633 that has lost about half of it's hydraulics. One lag will turn and other one won't. The bucket will not tip either way. The main boom will lift, but no down pressure.… read more
Dan
Dan
Technician
6,797 satisfied customers
I have a 35G excavator that we have converted to work in
I have a 35G excavator that we have converted to work in shafts at different mine sites. I'm trying to figure out what my pilot pressure is supposed to be. We have done away with all the electrics and… read more
Dan
Dan
Technician
6,797 satisfied customers
I have a 2008 Volvo EC35 C Excavator, 1,400 hours, and
I have a 2008 Volvo EC35 C Excavator, 1,400 hours, and working great, until… Driving along in the "Fast Mode (Rabbit switch)", then I de-selected "Rabbit, and then the cab would not rotate, further ch… read more
dieseldan55
dieseldan55
Mechanic
Vocational, Technical or Trade Scho
273 satisfied customers
I have a sumotomo excavator I am having issues with. When
I have a sumotomo excavator I am having issues with. When trying to drive the excavator either direction it wants to labor the motor or make it guit. Also noticed when extending the boom all the way o… read more
Dan
Dan
Technician
6,797 satisfied customers
I have a 200lc that wont track straight unless ou hold a
I have a 200lc that wont track straight unless ou hold a boom function. … read more
Dan
Dan
Technician
6,797 satisfied customers
My Mitsubishi Mini Excavator MSO30 controls should I say are
Sir, My Mitsubishi Mini Excavator MSO30 controls should I say are out of standard pattern. Can I switch hoses to correct this? … read more
Dan
Dan
Technician
6,797 satisfied customers
Pearl, I have 1993 jcb backhoe and would like to change
Gray Pearl, I have 1993 jcb backhoe and would like to change control pattern from backhoe to excavator control pattern can u advise please , many thanks Paul Sheahan. Email....***@******.*** … read more
Dan
Dan
Technician
6,797 satisfied customers
I have a Deere 490 E excavator. It has given me electrical
I have a John Deere 490 E excavator. It has given me electrical problems in the past. With some re-wiring, I thought all of this was behind me. The symptoms are, some, not all hydraulic functions act … read more
Dan
Dan
Technician
6,797 satisfied customers
I have recently aquired a 225b excavator. I've had to drain
Hi. I have recently aquired a 225b excavator. I've had to drain the hydraulic tank and replace a number of hoses, including the main suction hoses, hoses from the pumps to valve bodies, main drive hos… read more
catmastertech
catmastertech
Field service technician
Vocational, Technical or Trade Scho
1,287 satisfied customers
John Deere 690 E-LC 1991 machine dies out when put in a
John Deere 690 E-LC 1991 machine dies out when put in a strain. doesn't matter if it's walking or trying to pick up a bucket of dirt. it seems if you only work one function at a time it does ok but if… read more
Dan
Dan
Technician
6,797 satisfied customers
John Deere Excavator 490e: We have a John Deere 490e excavator
We have a John Deere 490e excavator that travels fine but is extremely slow to swing and lift. The problem happened after a piece of metal came up and hit the suction hose. We replaced the hose and fi… read more
Dan
Dan
Technician
6,797 satisfied customers
I just purchased a ex 200 LC-3 excavator and I would like to
I just purchased a ex 200 LC-3 excavator and I would like to switch from cat to john deer controls how do I do this.… read more
Dan
Dan
Technician
6,797 satisfied customers
Link belt 2700C series II Hydraulic IssuesA short at the
Link belt 2700C series II Hydraulic Issues A short at the split bolt connector in the console has fried the circuit boards in the control panel, so I've converted the machine to manual controls and th… read more
Dan
Dan
Technician
6,797 satisfied customers
My CX225SR excavator looses power when digging a full bucket
My CX225SR excavator looses power when digging a full bucket scoop, bring the bucket back up and the power returns what may be the cause.… read more
Dan
Dan
Technician
6,797 satisfied customers
I have a John Deere 690D Excavator that was running fine.
I have a John Deere 690D Excavator that was running fine. It just now started to bog down when applying any hydraulic function to the point where it stalls out the engine. The tracks barely turn. It w… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,409 satisfied customers
Hi I have an old mid 90s Hitachi ex55ur excuvator and for
Hi I have an old mid 90's Hitachi ex55ur excuvator and for no apparent reason the actions that function when either of the control levers are pulled towards the driver do nothing, all other operations… read more
Dan
Dan
Technician
6,797 satisfied customers
I Have a 2005 John Deere 160C Lc excavator that the hydraulics
I Have a 2005 John Deere 160C Lc excavator that the hydraulics seem to run at half power. When you track the machine and run boom functions at the same time the power is split to both functions but th… read more
Dan
Dan
Technician
6,797 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