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 mike Your Own Question

mike
mike, Technician
Category: Heavy Equipment
Satisfied Customers: 112
Experience:  certified master tech 20+ years combines, row crop, and four wheel drive
Type Your Heavy Equipment Question Here...
mike is online now
A new question is answered every 9 seconds

I have a 4430 jd tractor with a hydraulic problem The 3 point

Resolved Question:

I have a 4430 jd tractor with a hydraulic problem The 3 point hitch arms take a long time to come up ,steering wheel will not turn when first started,hydraulics will not run an external pump pto seems to run fine All this happens at an idle When reved up they seem to work fine   After the oil gets hot every thing slows right down The front hydraulic pump squeals from idle to half throttle The oil lite will come on at an idle after the oil is hot What is the problem?
Submitted: 4 years ago.
Category: Heavy Equipment
Expert:  mike replied 4 years ago.

Hi, the squall in your hydraulic pump is cavitation{ no oil coming from your charge/ transmission pump} or aeration { air being introduced into the charge pressure oil} under your rockshaft { 3 point hitch} there is a pump driven by a 6 sided shaft that receives its power from your flywheel. This pump supplies oil to your main hydraulic pump.Before your selective control valve or your hitch can work there must be at least 1800psi supplied to your steering and brakes. This is where your pressure control valve or as sometimes called your priority valve comes into the system. After there is 1800 psi supplied to steering and brakes it lets hydraulic oil flow to the rockshaft control valve housing for your hitch and selective control valves.

 

With that being said we know we have a charge/ transmission pump problem. Here are a few things that could possibly be the problem. Screen plugged in differential housing, cracked oil pipe in the charge pump circuit,worn out charge pump, charge pump drive shaft{ the 6 sided shaft, behind a plug, under the top link in the differential housing} plugged hydraulic filter and an internal leak in the clutch valve housing. An internal hydraulic leak in any of these systems will cause the oil to heat fast. This will decrease the hydraulic flow which decreases the hydraulic pressure { slow or no steering, lift chatters or slow to raise no hydraulics and the light comes on}

 

you could drain the hydraulic oil and check the screen. If it is plugged with fibers or metal shavings then you must determine where these shavings or fibers came from. Because if you just clean it off it will only be a temporary fix. The hydraulic pump that has a squall is probably damaged also, it will need to be inspected. I would take the tractor to your local dealer or repair shop and have it repaired. Operating this tractor under these conditions will ruin the hydraulic pump beyond repair.

 

 

I hope this helped, if you decide you would like to do some hydraulic test to pinpoint the problem I would be more than happy to assist you.

 

Mike

mike, Technician
Category: Heavy Equipment
Satisfied Customers: 112
Experience: certified master tech 20+ years combines, row crop, and four wheel drive
mike and other Heavy Equipment 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:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • 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
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka - Moose)

    Technician

    Satisfied Customers:

    112
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka - Moose)'s Avatar

    Chris (aka - Moose)

    Technician

    Satisfied Customers:

    112
    16 years of experience
  • http://ww2.justanswer.com/uploads/Boxerman1969/2009-06-22_213107_ja_avatar.JPG Tim's Avatar

    Tim

    Foreman

    Satisfied Customers:

    338
    23 Years Heavy Equipment and Truck Repairs Shop and Field in the Minning and Construction Industry
  • http://ww2.justanswer.com/uploads/jrwhitey2000/2009-01-03_193237_me.jpg J.R.'s Avatar

    J.R.

    Technician

    Satisfied Customers:

    148
    13 years as warranty technician for Detroit Diesel
  • http://ww2.justanswer.com/uploads/yellowman99/2010-03-20_033822_Marshall_Pete_Furr.jpg Cat Man's Avatar

    Cat Man

    Caterpillar Engine Expert

    Satisfied Customers:

    3706
    23 Years Caterpillar Engine experience.
  • http://ww2.justanswer.com/uploads/WT/wtolkson/2012-6-8_12723_JApicture2012.64x64.jpg Wayne's Avatar

    Wayne

    Journeyman

    Satisfied Customers:

    3017
    34 years experiance as engine rebuild and problems.Thermo-King repair and trouble shooting.
  • http://ww2.justanswer.com/uploads/cumminsdr/2010-7-20_204410_ja.jpg DR.Cummins's Avatar

    DR.Cummins

    FIELD SERVICE TECHNICIAN

    Satisfied Customers:

    2352
    16 Years working on Cummins Diesel engines,
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    service manager

    Satisfied Customers:

    2226
    30 years exp. with diesel engines, heavy equipment and forklifts, including lp forklifts