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I do not know if these are what you would call major repairs but on my 2005 dong feng 204a when new and got worse with time start circuit to starter,around 200 hrs added starter relay to hot from key switch to solenoid on starter . fixed it. around 700 hrs . water pump fan shaft sheared ,launched fan into radiator,pump not frozen. bad shaft I guess . replaced pump had 3 radiator tubes soldered up to fix leaks,still cools well without the 3 tubes. about 800 hours replaced seal and piston on 3 pt. lift. close to 1000 hrs . on now and no issues currently. will update later on 2006 foton ft 504a tractor.
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thinking about repairs on the 2006 ft 504a, I had to resolder the filler neck on the rediator .I had to replace the tachometer pick up, That tractor has a compressor for air brakes if you were pulling a trailer so equiped. Never used it for that ,blow up tires can run a nail gun which has been handy. But the orginal air filter was just a small housing of foam kinda like a lawn mower uses,removed that and plumbed into clean air side of air filter for engine, now engine oil stays cleaner longer. replaced plastic fuel strainer bowl with a ford 8n type housing which is glass.just little stuff tractor has around 1000 hrs .on it. replaced filter screen on hydros and put in a 10 micron screw on filter just cause I thought the filter was better than the screen. Can not say to much bad about it.
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My introduction to hydraulic machinery was late in life.
Amazing power !, and versatility. Other than my Front End Loading Farm Pro I also built a Caddigger841 from a kit.My backhoe operating friend laughed and called it cabbage-patch. But I have dug a two mile system of geothermal trenches plus with this machine and consider it a versatile tool.
Those geothermal trenches only held a 1&1/4” poly tubing so I built a 4” bucket to dig a seven foot deep trench. A 4” wide trench must be dug by feel as it is near impossible to see into other than high noon.
The hydraulic pump that runs this Caddigger is the same size pump that might be on a fuel oil furnace yet developes 2000 psi. from an 18 hp Briggs/Stratton.
The carburetor went bad and there was no replacement. I converted it to propane.
CADDigger Model 841 -
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there is nothing wrong running propane for sure ,everything engine wise lasts longer,the only downside is a slight power loss over gas. I guess where you are at you do not have clay soil, if slightly wet clay would never come out of a 4 inch bucket, sometime it sticks bad enought in my 24 incher. 2 miles hope you never have to look for a leak, so I assume that you are running a fluid thru a heat exchanger ? for climate control.
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Here in Northern Virginia below forest loam is exclusively red clay. And Four feet and below at my property it is more sandy/loose. But this area has suffered a prolonged abnormally dry climate (as much of the world ) and so the dirt readily shakes out. But I have fought the problem you referenced.
My geothermal is 8000 feet of 1&1/4” polyethylene tubing. Eight loops of 1000 continuous feet in a 500’ long trench seven feet deep. Five hundred feet at 7 feet depth and a 90degree turn back to the house at 3 feet of depth. I used filtered rain water exclusively in the tubing ….absolutely no antifreeze.
In 2011 we had a 5.8 earthquake with the epicenter 50 miles from here.
We were at the outer banks in a elevated rental in NC and it shook that barrier reef 100 miles away.
When I returned home I had one 3×5 window shattered and some items off the shelves….. but no geothermal leaks luckily!! I guess it shook the whole state and not many fault lines to produce cleavage or utility problems.
https://en.m.wikipedia.org/wiki/2011_Virginia_earthquakeThat geothermal tubing is tough and durable/pliable. An engineer for the company says in Alaska the rocky terrain forces many to just run the tubing above ground when freezing is not a problem. (He didn’t elaborate on when freezing wouldn’t be a problem).He was explaining that the carbon black mixed into the the tube manufacturing keeps sunlight from degrading the tubing over long periods.
Ps You must invest in Solar Panels. I have 32 panels since 2012 and have never had to pay a monthly electric bill. I do use wood heat but my geothermal radiant system is only backup in winter and it cools in summer for free.
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