PLEASE PATRONIZE OUR SPONSORS!
|
|
Thread Tools | Display Modes |
#1
|
||||
|
||||
KT17 surging
Picked up a 782last year that ran--barely. Made a dedicated sprayer machine out of it. Works great but we can't get it to run perfect. Darn thing surges, sometimes a lot, sometimes at all throttle speeds. Here is what has been done.
New plugs, all fuel line new, removed and washed tank (great flow to pump). By the manual, we adjusted the governor (the pc that clamps to the shaft). Opened the carb up 3x's at least. Removed the 2 large welch plugs (that's all was in the kit). Last time I drilled out one of the small brass plugs so I could visually see I could poke a wire thru the small brass vertical tube (air supply?) that feeds into the main jet area. I blew so much air (non-osha approved air gun) that I blew one of the welch plugs out. This is a Walbro carb, only adjustment is the low idle. Start by the book, sometimes run it in 1/2, sometimes open it 3 turns----sometimes it help, sometimes it doesn't. After I put the carb back on yesterday it ran great, tweaked jet 1/4, backed outside and let run for 10 flawless minutes. Decided to drive it around over some rough/hilly ground. Sure enough after a couple minutes the surge was back. We tweaked the carb, shortened the fuel line so it would barely touch the block (thinking heat/boiling fuel), problem still inconsistent. It actually started surging on one test run and the second we raised the hood, it quit. I did notice 3or 4 tiny black specs in the fuel bowl at one point yesterday--thinking something is coming loose from the pump (lines are new) Filled the tank fairly full, bypassed the pump, and added an inline filter. Her is how it behaves now, the first few minutes, it runs rough, now once it is hot it runs well enough that I logged about 2 hours running yesterday. Honestly, the only thing I know to do is pick up one of those aftermarket carbs and a fuel pump. Our theory is trash is coming from somewhere and intermittently obstructing something. We have yet to find a bunch of trash or varnish anywhere in the fuel system, and the fuel pump was swaped out for a used one I replaced on a M18 that got lots of new parts. Are we missing the obvious somewhere?
__________________
2072 w/60" Haban 982 with 3 pt and 60" Haban 1811 with ags and 50C 124 w/hydraulic lift 782 w/mounted sprayer 2284 w/54" mowing deck |
#2
|
||||
|
||||
Is the linkage tight? If there is wear it will "hunt".
__________________
Queen Of The Quietlines! |
#3
|
|||
|
|||
kt engines have points, might be worn and sometimes ignition issues look like fuel system issues.
|
#4
|
||||
|
||||
I think you are on the right track.
Those walboro's with the main jet on the side are lean, and all the jet screw does is basically allow you to lean it more. It is normal to get little flecks of fuel line in the bowl, especially when you replaced it all. I can only suggest you keep cleaning them out till you get them all. Were you able go get the emulsion tube out to clean it? ( it is the one in the center above the bolt that holds the fuel bowl on) Cant remember for sure, but thinking it was covered on the top by an expansion plug. With all the time you have spent, might be better to get one of those epay china adjustable ones as you mentioned, and be done with it. Just make sure if you do, it has the correct choke pull linkage for your application as there are front and rear pull linkages. Make sure their pix is the style you want. Do take care removing/replacing the fuel hoses as just a slight fleck can cause an obstruction. |
#5
|
||||
|
||||
You talking about the rod with those 2 special back plastic clips/bushings?
__________________
2072 w/60" Haban 982 with 3 pt and 60" Haban 1811 with ags and 50C 124 w/hydraulic lift 782 w/mounted sprayer 2284 w/54" mowing deck |
#6
|
||||
|
||||
Havent' bothered ignition yet. Seems like we are chasing a moving target, that's why we went after fuel.
__________________
2072 w/60" Haban 982 with 3 pt and 60" Haban 1811 with ags and 50C 124 w/hydraulic lift 782 w/mounted sprayer 2284 w/54" mowing deck |
#7
|
||||
|
||||
Quote:
FWIW, I even removed the adjustment screw at one point with the engine running and plugged the hole with my finger and it went to running better.
__________________
2072 w/60" Haban 982 with 3 pt and 60" Haban 1811 with ags and 50C 124 w/hydraulic lift 782 w/mounted sprayer 2284 w/54" mowing deck |
#8
|
||||
|
||||
Yes....
__________________
Queen Of The Quietlines! |
#9
|
||||
|
||||
I feel your pain, I've tried my hardest to get a single adjust Walbro clean.
At least 3/4 of them now. I know Jonathan thinks less of me, but I just replace a walbro.
__________________
Terry O,100,72,102,123,104,124,105 125,129,149,1200,982 (2)2182s w/60in Habans 3225 |
#10
|
||||
|
||||
John, I had a M20 that I repaired and sold awhile back that had a sticky throttle valve. See this post.
http://www.onlycubcadets.net/forum/s...ad.php?t=44023 I never figured out why it did that. I just ran it on to bench, but maybe in a tractor it would have surged. It was like when it was running the shaft had a bind, when stopped it was free as a breeze. Good luck.
__________________
Richard 1979 IH Cub Cadet 782 w/CH20, dual hydraulics, power steering and Cat 0 three point |
|
|
Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.
MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.
This website and forum are not affiliated with or sponsored by MTD Products Inc, which owns the CUB CADET trademarks. It is not an official MTD Products Inc, website, and MTD Products Inc, is not responsible for any of its content. The official MTD Products Inc, website can be found at: http://www.mtdproducts.com. The information and opinions expressed on this website are the responsibility of the website's owner and/or it's members, and do not represent the opinions of MTD Products Inc. IH, INTERNATIONAL HARVESTER are registered trademark of CNH America LLC
All material, images, and graphics from this site are the property of www.onlycubcadets.net. Any unauthorized use, reproductions, or duplications are prohibited unless solely expressed in writing.
Cub Cadet, Cub, Cadet, IH, MTD, Parts, Tractors, Tractor, International Harvester, Lawn, Garden, Lawn Mower, Kohler, garden tractor equipment, lawn garden tractors, antique garden tractors, garden tractor, PTO, parts, online, Original, 70, 71, 72, 73, 76, SO76, 80, 81, 86, 100, 102, 104, 105, 106, 107, 108,109, 122, 123, 124, 125, 126, 127, 128, 129, 147, 149, 169, 182, 282, 382, 482, 580, 582, 582 Special, 680, 682, 782, 782D, 784, 800, 805, 882, 982, 984, 986, 1000, 1015, 1100, 1105, 1110, 1200, 1250, 1282, 1450, 1512, 1604, 1605, 1606, 1610, 1615, 1620, 1650, 1710, 1711, 1712, 1806, 1810, 1811, 1812, 1912, 1914.