Page 1 of 7 12345 ... LastLast
Results 1 to 15 of 93

Thread: Fiat Allis 14C transmission oil pressure regulator

  1. #1
    Member Animal's Avatar
    Join Date
    May 2011
    Location
    New Zealand
    Posts
    58

    Fiat Allis 14C transmission oil pressure regulator

    Hi, I am a new member here, and recently bought my first ever bulldozer, a Fiat Allis 14C. I'm having problems with low transmission oil pressure.

    I have pulled the pressure regulator apart, and it looks as though the piston has been put in backwards (the relief holes are closest to the spring?)

    Could anyone please tell me if this is correct, and also the correct way to re-set the spring tension?

    Any help would be very much appreciated. Thank you.

    I look forward to meeting a few members here

  2. #2
    Member Animal's Avatar
    Join Date
    May 2011
    Location
    New Zealand
    Posts
    58

    Question Low Transmission Oil Pressure in general...

    Hmmm...I am going to expand my original question a little in the hope that someone here can point me in the right direction.

    The transmission oil pump is working fine, it has been pulled apart and checked. What do you think I should look at next to solve this problem?

  3. #3
    Senior Member
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    151
    My memory of the 14c is that a valve used to stick closed or fail to open suficently, Also Check the grade of oil in transmission.
    I think you wil find that the Transmission is ok However does it push ok or lacking in power/Grunt
    The NZ Forest Serrvice in Rotorua had a few from memory they had both 10c and 14c You never know they may have a contact that could help you.
    further, They were a good lively machine
    Last edited by lpnt65; 05-28-2011 at 11:41 PM. Reason: I was going to add more info but thendecided it may cause Confusion

  4. #4
    Member Animal's Avatar
    Join Date
    May 2011
    Location
    New Zealand
    Posts
    58

    Smile

    Thank you so much for your reply and suggestions. I am pretty sure the oil is correct, as the mechanic/husband followed the manual and knows about this sort of thing. I will pass on your info re: sticky valve. I'll let you know what he says- perhaps we may ask you more if you don't mind?

    We have been trying to chat to people familiar with this model here in NZ, or who have a manual, but it has been dragging on a bit. It is hard to pester people when you are asking for their help! That is one of the reasons that I signed up here...

    and I am so glad I did!!!

  5. #5
    Member Animal's Avatar
    Join Date
    May 2011
    Location
    New Zealand
    Posts
    58
    Hi thanks Ipnt65, I was starting to wonder if there is a valve stuck open and dumping oil pressure as I have pulled the main pressure regulator apart and everything appears O.K. I've tried different spring tensions but no change. Oil is a mono 30 grade oil as per opperators manual. The spool valves for the forward, reverse and the 3 speeds does leak oil out of the seals where the shafts go in, but I was going to look at them at a later date but maybe I'll have to look sooner?
    The machine seems to perform O.K. has plenty of push, and I have even managed to spin the tracks on firm ground, it shuttles forward to reverse in about 1/2 a second which to me seems O.K. But it takes about 1/2 an hour to warm up before you can move it,you can encourage it to move earlier if you run at 1/2 throttle and shuttle forward/reverse for a bit and then it will move in about 10 minutes. I sort of suspect there's not a major problem but it would be nice to sort it out. Many thanks.

  6. #6
    Senior Member
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    151
    Hi Again i was thinking is the 14 a FULL Power shift thru torque convertor OR power shift type gear change lever and it has a clutch i Cant recall now how it worked The 10c had a problem when you were dozing down a steep hill the tranmission would delay to long before machine would reverse. the problem there was valves sticking when they were tested at standing they were ideal but put the nose down hill pressure dropped there were only 2 that had that problem i left nz before problem was resolved but i do know that they found it was valves both were working in very steep country one was up back of Matahina area doing Logging and the other was up at Waihau Bay on East Coast doing general cotracting work on farms etc. will see if i can locate a manual for either machine I haven't had much to do with dozers for a few years, thats what happens when one retires you also forget things

  7. #7
    Senior Member
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    151
    hi Again again,Have you checked to see if hoses are in good condition periodicly, the hoses on a Wabco Grader I had the interior of the hoses separated this of course blocked most of oil get to the transmission yet the pressures were all ways good when they were checked it had only a few hundred hours on clock when this occured. So as a suggestion cxheck interior of hoses someone may hve replaced a hose that is not compatable with the presures or even the non compatable with the oil i

  8. #8
    Super Moderator willie59's Avatar
    Join Date
    Dec 2008
    Location
    Knoxville TN
    Posts
    9,836
    I know nothing about a 14C, just wondering if it has a converter driven charge pump that is fed by hose from tranny sump. Maybe hose or elbow connections are allowing air into charge pump suction line causing difficulty to draw oil. And is there a strainer in suction line that's maybe clogged?
    A good mechanic isn't expensive, he's priceless!

    http://www.bluediamondattachments.com/

    Read Forum Rules Here

    Please don't respond to spammers...makes our job tougher mopping up their mess

  9. #9
    Member Animal's Avatar
    Join Date
    May 2011
    Location
    New Zealand
    Posts
    58
    Good morning All, Yes the 14 I have has full power shift and torque converter (built about 1980). Interesting you said about the sticky valves when on a steep slope, I was backing up the other day and it would shuttle forward so by screwing sideways was enough to engage forward and away I went, it was petty steep only just backed up.
    Some of the hose's were not in good condition on the outside so have been replaced. The T/C pump's hose's are O.K. as I've had the pump apart and checked the pressure line and replaced the intake hose when I cleaned the filters etc. Yes Willie59 the pump is charge from the trany sump via the intake filter and hose, but I have just remembered there is a pressure return line form the regulator back to the pump intake and the seals there might not be so good as they are only a couple of fiber washers of dubious quality.
    Ipnt65, I happen the be in South Canterbury even though the dozer came from Taupo so am not familar with dealers or machanics up there, but was trying to remeber if Cable-Price were the agents for Fiat-Aliis or if it was someone else?
    Thanks for your help guy's it gives me more channels to follow. Would by running the trans oil pressure low cause much if any damage? Thanks once again Nelson.

  10. #10
    Senior Member D6 Merv's Avatar
    Join Date
    May 2007
    Location
    Coromandel Peninsula. New Zealand
    Posts
    515
    Hi Animal.
    Yes Cable-Price were the agents, but have long since abandoned Fiat Allis.
    If you are close to one of there dealers mite be worth asking if there is any older personnel there that may have been around in the days of the 10C and 14C, I,m fairly sure also that the NZFS bought a few of these machines when they came out.
    Cheers Merv

  11. #11
    Senior Member
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    151
    Hi Again. I think it would be worth trying the new company that have started up inNz few years agoall I know that Bob Mcfarlane who used to Be NZ manager for Cable price is Manager of this new company as far as i knbow they sell Hitachi gear or You may think about calling theFormer Manager of cable price Rotorua His name is John Clayton i guess he is still around although he would be in his seventies His address is Sophia St Rotorua hge may be able to puit you in touch with former cPD Mechanics
    Tell him Les Paton said to call {he can be bit short at times but he a great bloke** I am sure if any one can help you either of these 2 blokes could regards lpnt65

  12. #12
    Member Animal's Avatar
    Join Date
    May 2011
    Location
    New Zealand
    Posts
    58
    Hi, just a quick update on the dozer. We very much suspect an air leak in a hose causing the line to suck air. Currently trying to find the leak, and also to find a picture of the hydraulic system from a manual.

    Thanks for the names and contacts, Les and Merv, too. All your help is very much appreciated.

    Will try and keep you posted with our progress, and hopefully some good results to share

    -Mrs Animal (hence short on detailed explanation of leak etc)

  13. #13
    Member Animal's Avatar
    Join Date
    May 2011
    Location
    New Zealand
    Posts
    58
    Very Brief Update: Himself found a hole in a short piece of hose where oil could get out yesterday. He has replaced that length and we hope that will be problem solved. Fingers crossed...

  14. #14
    Member Animal's Avatar
    Join Date
    May 2011
    Location
    New Zealand
    Posts
    58

    Animal update

    Animal update. Evening All, yes, were to now? The only thing that seems possitive is that the symptoms seem consistent. We still have low pressure, no change there, and we do have air in the oil, but after the pump.
    I've had the pump out and all the suction line including the filter housing on the trans, reassembled it with new "O" rings, gaskets etc. Checked the scavenger pump and line and strainer, O.K. now. interestingly I'm finding little faults here and there but nothing to solve the problem. I don't think who ever worked on this machine was particularly fastidious.
    In the beginning the charge pump use to flood the torque converter so at least it doesn't do that now. I've cleaned the heat exchanger thinking that was not flowing oil. I've had the bottom off the control valves to see if I could find something but other than an "O" ring that wasn't right all else seem O.K. What I have got is small oil leaks on the seals for the control shafts on the valve head plus leaks on the input and output shaft for the torq/convert and trans, are these a problem?
    I'm starting to scratch my head now! Is it possible for air to get into the system via the control valve? A struck valve would expain low pressure but air? Thats why I haven't opened it up yet but maybe that's tomorrows job.
    Les I haven't managed to get hold of John yet but will keep trying. Many thanks guy's. Nelson.
    Last edited by Animal; 06-07-2011 at 04:07 AM. Reason: spelling mistake

  15. #15
    Senior Member
    Join Date
    Apr 2009
    Location
    Australia
    Posts
    136
    Animal,
    I have a 14C, but luckily your particular problem is one I've never had.
    My transmission woes involve overheating but that's another story.
    I do have a service manual with a good schematic diagram of the transmission hydraulic system if you're still looking for one.
    Cheers, Greg

Page 1 of 7 12345 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •