I have Kolher Command 25hp in a Cub Cadet LT1050. I have an unusual problem and I'll add as much detail as I can here.
- When I bought the mower it had about 185 hours on it. I noticed the air/oil separator was cracked, didnç¨š seem to impact function of the unit. Did have some occasional backfiring when shutting down, other than that Worked good all year.
- Next year (stored inside for a winter) changed oil, spark plugs, air filter, after a while about ï½½ through the mowing season, the mower would act like it was running out of gas, looping and surging, after mowing for about an hour. I thought this was a fuel filter issue because the fuel filter was mostly empty when it happened. To troubleshoot the issue Iè‡´e done the following:
o Replaced Fuel/Oil separator, (valve cover breather) and gasket all air tight now
o Cleaned Carburetor, used Kolher carb rebuild kit, new gaskets and float etc. (Seemed to help overall running, but issue recurred)
o Replaced Pulse Fuel Pump, Air filter, Spark plugs
o Checked Fuel Solenoid Shut off Operation (seems to work good)
o Re-routed and replaced some of the fuel lines (seemed to help a little, no clue why)
o Relocated Fuel filter to under gas tank so it stays full. Replaced Fuel filter 3x, no real change.
o Ran with gas cap off, gas cap vent clear
o Ran multiple tanks of gas- not a fuel age issue
- So with all of this the only things Iè‡´e learned are, if I disconnect the fuel lines (like to change a filter, pump, or replace line) the situation seems to get better for at least an hour or 2 of cutting. I have no idea why though. Sometime when it starts to Surge and act like its out of gas, a little choke will keep it going for a few extra minutes, but it will eventually just die. Iè‡´e checked the bowl on the carb after it dies and it seems like there isnç¨š enough fuel in it, but there is still enough in there that would make me think it should run (about 10-20 ml?). The carb is NOT hot when this issue happens, and it doesnç¨š seem like the engine is over-heating. The engine usually starts and runs good prior to the å¦¬ssue although it does seem lately like itç—´ lacking power for a 25 HP engine. Iè‡´e tried to look for intake or exhaust leaks, but donç¨š have the proper tools to perform a leak down test. Any suggestions would be helpful. What is causing me a headache is that the issue will go away for a little while and then randomly return.