|
PLEASE PATRONIZE OUR SPONSORS!
|
|||||||
 |
|
|
Thread Tools | Display Modes |
|
#1
08-05-2025, 01:24 PM
|
|||
|
|||
LT1050 Weird issue PTO circuit?
Hi, we are having a weird issue on a used lt1050. Initially it was a no start issue which was fixed with a new carb and plugs, fuel lines, filter.
Now it runs great except when you start, start cutting, then turn off pto and keep driving. The mower then rpm hunts up and down until pto is engaged again. The reverse mode button does not work either. Seems like a safety circuit issue but seems like it should be cutting off (?) rather than just rpm hunting? I did read through this great manual for ltx which seems similar and it seems like maybe its trying to ground out but maybe only killing one cylinder bank or something weird like that (?). The site is not searchable so could not find the lt version. https://service.mtdproducts.com/Trai...7_electric.pdf Thanks.
__________________
Vintage Models owned (but sold unfortunately!): 100, 102, 105, 125 " Modern" models: LT1050, GT2544, LTX1040 (electric conversion) 
|
|
#3
08-05-2025, 03:06 PM
|
|||
|
|||
|
Sounds right, I forget the exact engine code. Its the 25hp.
So does the governor kick in or out based on the PTO running? Just confused why it only does this after the pto is turned on then off. It doesn't do it under load going up a large hill and then on flat (lower load) then downhill with the pto off. Have not messed with the governors before. Thanks.
__________________
Vintage Models owned (but sold unfortunately!): 100, 102, 105, 125 " Modern" models: LT1050, GT2544, LTX1040 (electric conversion)
|
|
#4
08-05-2025, 04:06 PM
|
||||
|
||||
|
The purpose of a governor is to keep engine RPM constant regardless of load.
It is internal to the engine and is always working as long as the engine is running. If load increases and engine RPM starts to drop, the governor opens the carburetor to give the engine more gas. And vice versa if load decreases, it closes the carb to prevent engine over rev. In your case, when you shut off the PTO, the mower load is removed and the governor starts searching for the same engine speed with less throttle but can't get happy. That is called surging, and correct governor sensitivity eliminates surging. Little springs on your governor to throttle connection control that sensitivity. All that being said is with assumption that all other things are correct such as carb settings, ignition, etc.
|
|
#5
08-06-2025, 12:35 PM
|
|||
|
|||
|
Just to clarify, are you talking about the tiny little spring that is on the throttle rod? thanks
__________________
Vintage Models owned (but sold unfortunately!): 100, 102, 105, 125 " Modern" models: LT1050, GT2544, LTX1040 (electric conversion)
|
|
#7
08-06-2025, 01:52 PM
|
|||
|
|||
|
Thanks that makes total sense. Will check it. Might not get to it for a few days. Thanks will let you know.
__________________
Vintage Models owned (but sold unfortunately!): 100, 102, 105, 125 " Modern" models: LT1050, GT2544, LTX1040 (electric conversion)
|
|
|
|
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.
Linear Mode
