I have a L3540 HST ,pulling a disc in mid range or low range it keeps bogging down as if a fuel problem .I have used it with a bushog with same results .I drained fuel and replaced with new fuel still doing it .Anyone have ideas to try ? The air breather is new .
L3540 choking down
- Thread starter keith66
- Start date
Will it start back up right away or after you do all that?
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85Hokie
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Equipment
BX-25D ,PTB. Under Armor, '90&'92-B7100HST's, '06 BX1850 FEL
first thoughts I had have been mentioned already....
air cleaner
fuel filter
fuel delivery - restriction in tank
and cap vent
Does it bog only under load? Run up rpm without moving, does it bog?
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If black smoke is present during the bog, look closely at the air filter/air intake system.
If not black smoke, look at your fuel system, specifically the supply side (tank to lift pump). I like to do a flow test. Easy to do. Rig up a nurse tank and connect it to the injection pump's inlet. You'll have to bleed it, but it takes 2 seconds (knob). Nurse tank can be an old gear oil bottle flushed out really good, the one with a nipple on it. Put a piece of fuel line on the nipple and connect to the injection pump. The loose end of the fuel line that you took off of the injection pump, run that into a jar and have someone start the engine. Watch your flow closely. Should see it come out solid fuel, and the stream should be the same size as the ID of the fuel line. If you're seeing bubbles in the stream, there's an air leak somewhere. No bubbles and low flow (it's usually obvious) there's a restriction. I see a lot of leaves get into the tank, then down onto the tank's outlet, restricts it, and the lift pump will starve, then of course engine bogs under load. You can't really get down into the tank on a lot of them to remove said debris, so the only option is to remove the tank and clean it. Fun.
If not black smoke, look at your fuel system, specifically the supply side (tank to lift pump). I like to do a flow test. Easy to do. Rig up a nurse tank and connect it to the injection pump's inlet. You'll have to bleed it, but it takes 2 seconds (knob). Nurse tank can be an old gear oil bottle flushed out really good, the one with a nipple on it. Put a piece of fuel line on the nipple and connect to the injection pump. The loose end of the fuel line that you took off of the injection pump, run that into a jar and have someone start the engine. Watch your flow closely. Should see it come out solid fuel, and the stream should be the same size as the ID of the fuel line. If you're seeing bubbles in the stream, there's an air leak somewhere. No bubbles and low flow (it's usually obvious) there's a restriction. I see a lot of leaves get into the tank, then down onto the tank's outlet, restricts it, and the lift pump will starve, then of course engine bogs under load. You can't really get down into the tank on a lot of them to remove said debris, so the only option is to remove the tank and clean it. Fun.