Page 1 of 2 12 LastLast
Results 1 to 10 of 17
  1. #1
    New Member
    Join Date
    Aug 2011
    Posts
    12
    Tractor
    John Deere EZTrak Z445

    Default Engine Surge / Stall on John Deere EZTrak z445

    Hello and thank you in advance to anyone who takes the time to read and offer suggestions.

    I have a 2 year old Z445 zero turn mower with the Kawasaki V-Twin 25hp on it; it has just over 60 hours on it and the maintenance is current. A few weeks ago I was mowing (2 acre yard) and when I was almost done I noticed the throttle surging up and down during operation. It evened out after a few minutes and then I was done. I honestly forgot all about it, and when I got the mower out the next weekend, it started doing the same thing about 10 minutes in. It kept surging up and down and finally started bogging down when I hit thicker grass, and nothing bogs this mower down. Eventually it started dying and I had to choke it to restart it each time. It would die when I engaged the blades and finally started dying when I tried to move the mower even before engaging the blades. I let it cool off, then put it up and finished with another mower.

    The next day I pulled the gas tank off and drained it; there were a few black specs in it. I pulled the (new) fuel filter and blew it out; there was a small chunk of debris in it. I checked the (new) plugs and they were black. I cleaned them up, checked the gap and re-installed. I checked the (new) air filter and it was very good. I checked the oil and it was perfect. I put everything back together and ran it hard for 10 or 15 minutes and it ran great with no surging or stalling. I thought the problem was solved.

    The next weekend I fired it up and started mowing. The same problems happened as soon as I start moving forward after backing out of the garage. I mowed through it...at times it would die several times in a row and then would mysteriously run great for 15 or 20 minutes before the same cycle happened again. Each time I have to choke it to re-start and I am clueless what to do next.

    I really appreciate any ideas anyone has.

  2. #2
    Platinum Member
    Join Date
    Jul 2011
    Posts
    594
    Tractor
    Mahindra 4510

    Default Re: Engine Surge / Stall on John Deere EZTrak z445

    You probably picked up some debris in the main jet, the surging is the governor basically revving the motor to compensate for the problem. All is not lost. Here is what you do...shut off gas with valve or gently clamp off line with vise grips, locate the carburetor bowl and mark it with a sharpie line extending from top of carb to bottom of bowl, next remove bowl and clean, spray carb cleaner into bottom of carb, remove fuel line at carb and spray carb cleaner in there as well, let dry and re install bowl using you line for reference, locate the main needle valve and turn it counterclockwise 1/2 turn, turn gas back on and restart. If problem still exists turn main jet out another 1/2 turn, if still surging you will need to disassemble and clean entire carb.

  3. #3
    Gold Member tmajor's Avatar
    Join Date
    Oct 2007
    Posts
    362
    Location
    NE PA
    Tractor
    '53 Ford NAA, Woods ZTR MZ1952, '78 Jeep CJ-5

    Default Re: Engine Surge / Stall on John Deere EZTrak z445

    There are couple of things, which come to mind;
    My neighbor had an older Wheel Horse, which was doing the same thing. He never let me look at it, but another neighbor, who works on small engines did. He gave up! The tractor was ultimately sold, to another guy, who plays with them and is into lawn tractor pulling. He said it was something with the piston. Maybe. ??

    My NAA didn't run too good for a while. The fuel bowl would have some specks in it, but always seemed to have fuel. Finally, I reset the point gap. ??
    Sometimes, it seemed to be OK and other times it would start surging.

    My Woods ZTR quit, or acted like yours. I replaced the fuel filter, which "looked good", but I couldn't blow through it. The new filter cured it.

    Also, weed whacker and chain saw needed carb attention this season.

    My thoughts are, that ethanol fuel is causing most of the problems.
    "There's gotta be a better way!"

  4. #4
    New Member
    Join Date
    Aug 2011
    Posts
    12
    Tractor
    John Deere EZTrak Z445

    Default Re: Engine Surge / Stall on John Deere EZTrak z445

    Thanks for both replies so far. I will definitely look at all of your suggestions and let you know what I find.

  5. #5
    Veteran Member
    Join Date
    Jun 2004
    Posts
    2,051
    Location
    KY
    Tractor
    Kubota L3830, Ford Golden Jubilee, AC B, '39 Sears Economy, Polaris Ranger 400

    Default

    Sounds like fuel starvation. Check the obvious things like filters, fuel lines, shutoff valve etc.

    Those engines run oddly I think when no load is applied. Part of their emission controls I think.

    Have u cleaned the air filter?

  6. #6
    New Member
    Join Date
    Aug 2011
    Posts
    12
    Tractor
    John Deere EZTrak Z445

    Default Re: Engine Surge / Stall on John Deere EZTrak z445

    PapaPerk - I put a new air filter on this season and I did pull it off and check it. It was very clean but I went ahead and blew what little dust out that was in it. I also checked the foam pad under it to make sure it was seating properly and it was good.

  7. #7
    Platinum Member
    Join Date
    Jul 2011
    Posts
    594
    Tractor
    Mahindra 4510

    Default Re: Engine Surge / Stall on John Deere EZTrak z445

    If you are not comfortable with carb disassembly you can always pull the fuel line just after the filter and run it on sea foam till it smokes like crazy and shut it down, reconnect line, give it a day and restart it. I have had varied degrees of success with sea foam and mildly gummed up carbs, my preferred method is to disassemble and run thru the ultrasonic cleaner, blow out with air and reassemble with new gaskets and seats.

  8. #8
    New Member
    Join Date
    Aug 2011
    Posts
    12
    Tractor
    John Deere EZTrak Z445

    Default Re: Engine Surge / Stall on John Deere EZTrak z445

    Thanks again for all the replies...last night I fired it up and as soon as I started forward it stalled. I didn't even have time to loosen the gas cap to check for a vacuum. I fired it back up and it ran great for about 30 minutes in hard mowing conditions. Finally it started surging and I was able to rule out the gas cap vacuum...loosening it had no effect. I couldn't keep it running at all...I thought I would never make it back to the garage.

    I am going to try cleaning out the carb main jet next.

  9. #9
    Gold Member tmajor's Avatar
    Join Date
    Oct 2007
    Posts
    362
    Location
    NE PA
    Tractor
    '53 Ford NAA, Woods ZTR MZ1952, '78 Jeep CJ-5

    Default Re: Engine Surge / Stall on John Deere EZTrak z445

    Before getting into the carb, I'd suggest pulling the fuel line off the carb and letting the gas run into a container for 10 -15 minutes, to see how the flow is.
    "There's gotta be a better way!"

  10. #10
    New Member Tacman's Avatar
    Join Date
    Mar 2011
    Posts
    2
    Location
    N. Illinois
    Tractor
    JD LA135se

    Default Re: Engine Surge / Stall on John Deere EZTrak z445

    By chance did you check the fuel cap to make sure it was able breath? If its plugged, it will look like fuel starvation. Just clean the vent hole with a paper clip.

Page 1 of 2 12 LastLast

Similar Threads

  1. John Deere 2305 Compact Tractor Transmission and rear PTO failure
    By JBarnes6767 in forum John Deere Owning/Operating
    Replies: 100
    Last Post: 01-27-2014, 04:44 PM
  2. John Deere 318 needs a new engine
    By cmkh3 in forum General Lawn & Garden
    Replies: 5
    Last Post: 07-13-2010, 01:00 PM
  3. John Deere 750 Engine Problem
    By cjmmbrock in forum Parts/Repairs
    Replies: 2
    Last Post: 12-13-2009, 07:57 PM
  4. PT-425 Engine Removal Procedure [Long]
    By SnowRidge in forum Power Trac
    Replies: 7
    Last Post: 04-12-2009, 09:20 PM
  5. John Deere engine
    By ernemats in forum John Deere Ag Tractors
    Replies: 11
    Last Post: 01-29-2007, 03:45 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.