Construction and Road Equipment

Construction and road equipment repair questions? Ask a mechanic ASAP

Ask an Expert,
Get an Answer ASAP!

I am working on a project to fit a rotating grapple with…

Customer Question
Hi there, I am...

Hi there, I am working on a project to fit a rotating grapple with hydraulic chainsaw attachment on a Volvo EC220DL excavator. As there is no hydraulic function available to run the saw we have set this up with a new priority valve flow regulator - fitted directly between the pumps and the main valve bank.

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

Great thanks

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

The extra function with fitment of a priority valve (similar to those used with muching attachments etc) is the main thing. We are having difficulty in finding a way to connect to the Volvo load sense system to get both pumps active - this is the solution we're chasing. Thanks

Submitted: 8 months ago.Category: Construction and Road Equipment
Show More
Show Less
Ask Your Own Construction and Road Equipment Question
Customer reply replied 8 months ago
At the moment this circuit looks like the attached diagram, but without the load sense line and shuttle valve.During tests yesterday we managed to set the flows and pressures for this new priority circuit - but without any load sense we had to activate two other functions (grapple close and boom out for example) in order to stroke both pumps.We are still waiting for advice from Volvo product support and suspect that due to this unorthodox approach we may not get the answers we need (The extra complexity stems from the fact that the Volvo load sense is electronically managed).In the meantime we hoped to use just one extra function (grapple close) to stroke both pumps then allowing the 'saw' function to be activated and operate correctly. This would also serve as a 'dead-man' switch ensuring the saw couldn't be activated accidentally.
This does work but due to the low flow demand of the grapple circuit only one pump is stroked, which is insufficient for the 160L/min required by the saw.
Customer reply replied 8 months ago
The priority flow regulator used on this machine should have been a "Vosch 300 double" on page 4 of the attached PDF to suit the two pump system on this machine.
Due to supply issues we've had to instead fit two "Vosch 300 single" valves and simply tee connected their output to a common pressure output line over the boom.
Answered in 13 hours by:
8/5/2017
Mechanic: Dan, Technician replied 8 months ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 6,581
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. Is this machine plumbed for a hammer or aux hydraulics? If so I am assuming you are running the grapple off of that circuit and need an additional circuit for the saw. The best way is to add another valve bank for that function. It is not common practice to bypass or tie in between the pumps for any AUX function. Let me know. We can follow up as needed.

Ask Your Own Construction and Road Equipment Question
Customer reply replied 8 months ago
Hi Dan, appreciate your response.
The Volvo is X3 spec so there is an extra function X1 for working tools (now running the grapple) and X3 function operating the rotate.The priority flow regulator has been fitted to give us the additional circuit required by the saw for the following reasons;
1) We needed to add an extra valve in any case
2) The priority arrangement is preferred as we will have priority given to the saw motor to keep correct cutting speed regardless of other inputs.It seems that for mulcher type attachments on excavators a priority arrangement like this isn't necessarily uncommon and works very well in these scenarios.
We also need to allow for flexibility of adding a mulcher to this excavator in future with the same performance considerations in mind.This machine is equipped with the priority valve now so I am seeking information from an excavator expert that will help complete the job - rather than going back to any other method.Cheers
Was this answer helpful?
Ask Dan Your Own Question
Dan
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 6,581
6,581 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

1,272 satisfied customers

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

Wayne

Wayne

Journeyman

615 satisfied customers

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

Cat Man

Cat Man

Cat Engine Expert

495 satisfied customers

I am ASE Master Certified.

dieseldan55

dieseldan55

Mechanic

270 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
Do u know about 1986 deere 490 excavator rotary manifold. Do
do u know about 1986 john deere 490 excavator rotary manifold … read more
Dan
Dan
Technician
6,581 satisfied customers
I have a Takeuchi TB230 mini excavator. The dang hydraulics
I have a Takeuchi TB230 mini excavator. The dang hydraulics on it are very random. There are times where it is a smooth as glass and then all of the sudden it will jump and shake ya to death. It does … read more
Dan
Dan
Technician
6,581 satisfied customers
I have a Genie 644 lift that will not lift to capacity. Pump
I have a Genie 644 lift that will not lift to capacity. Pump pressure is good. There is a switch under the steering wheel that reads pump off. when I cycle this switch the lift will operate to capacit… read more
Dan
Dan
Technician
6,581 satisfied customers
I have a 1986 deere straight 490 excavator, working on
Hello I have a 1986 john deere straight 490 excavator, working on rotary manifold, I have john deere parts manual but I have replaced 4 seal and I need to know where the top o ring goes, there are 3 l… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
615 satisfied customers
Gehl 353 mini excavtor will not swing to the right. Sure.
gehl 353 mini excavtor will not swing to the right … read more
Dan
Dan
Technician
6,581 satisfied customers
How do you take out the fuel tank on a 277b cat.
yes, Ive got the cab up and the joysticks loose and the HVAC plastic tube loose … read more
Dan
Dan
Technician
6,581 satisfied customers
Altec ah125, lower boom will not boom down, currently stuck
Altec ah125, lower boom will not boom down, currently stuck straight up, all other functions work correctly… read more
Dan
Dan
Technician
6,581 satisfied customers
I have cat v155c fork lift. when it warms up the
I have cat v155c fork lift. when it warms up the transmission starts to slip. I can back it up ,but it will not go forward if I rev it up it will try to move forward… read more
Dan
Dan
Technician
6,581 satisfied customers
Have a p&h 22 ton Rt model cn115 s/n56578 outriggers will
Have a p&h 22 ton Rt model cn115 s/n56578 outriggers will not retract in and horiz is very slow and no power. I changed all Hydralic filters electric switch panel did get wet in rain put dry now … read more
Jeremy
Jeremy
Technician
Vocational, Technical or Trade Scho
104 satisfied customers
I've got a 1976 case backhoe. The starter went out and I
I've got a 1976 case backhoe. The starter went out and I purchased a new one, but that one stopped workiing shortly after. I replaced the positive cable and the solenoid, but it still didn't work. Wha… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,272 satisfied customers
I have a 2004 GMC c7500 with a 7.2l cat diesel engine died
i have a 2004 GMC c7500 with a 7.2l cat diesel engine died while driving and wont restart. has all 6 injector codes SPN 651-656 FMI 11. will start and die with either. … read more
timothy ratcliff
timothy ratcliff
t3
Vocational, Technical or Trade School
12 satisfied customers
I have 226b Cat skid loader, had the auger attachment on and
I have 226b Cat skid loader, had the auger attachment on and operating, and with no warning the hydraulics to it and the machine quit, but engine still running. Machine will not move … read more
catmastertech
catmastertech
Field service technician
Vocational, Technical or Trade Scho
1,287 satisfied customers
Deere 4640 keeps blowing power shift valve gasket between
John Deere 4640 keeps blowing power shift valve gasket between two of the ports. After it blows, pressure is getting to clutch packs and causing drag in all gears except 7 and 8. The only other proble… read more
Dan
Dan
Technician
6,581 satisfied customers
I have a TH 514 telehander. Been working fine but get in it
Been working fine but get in it today and won't go any faster than idle … read more
Dan
Dan
Technician
6,581 satisfied customers
I have a v155c forklift. after using it for about half a
I have a v155c forklift. after using it for about half a hour the trans starts to slip.if I give it more gas and then let off , it will more a little bit … read more
timothy ratcliff
timothy ratcliff
t3
Vocational, Technical or Trade School
12 satisfied customers
I am working on a 12e motorgrader serial number 99e9553. I
I am working on a 12e motorgrader serial number 99e9553. I am looking for the procedure to adjust he clutch.… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,272 satisfied customers
I have a KX 121 -3 kubota excavator. All hydraulic seems to
I have a KX 121 -3 kubota excavator. All hydraulic seems to be ok but walking is weak on both tracks. After running a bit it barely will turn… read more
Dan
Dan
Technician
6,581 satisfied customers
I have a terex telehandler th0806a serial 8322 8000lb lift
I have a terex telehandler th0806a serial 8322 8000lb lift when u put it in foward or reverse it moves but is real slow in all three gears gets worse after it gets out is their a transmission pump wha… read more
Dan
Dan
Technician
6,581 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