Engine boggs down when trying to track

Bobcat 341. I am new to the machine. Engine runs fine and will track slow, but when trying to track a little faster, the engine starts to bogg down, like it would have brakes on. Help?

Was reading some of the other post. Could it be as simple as adding the wrong hydraulic fluid. Would a thicker fluid casuse the engine to bog down? thanks,

JohnB said:

Was reading some of the other post. Could it be as simple as adding the wrong hydraulic fluid. Would a thicker fluid casuse the engine to bog down? thanks,

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I'd doubt it would be the oil, unless it's really cold there. Does it do it even if the machine is nice and warm?

Tazza said:

I'd doubt it would be the oil, unless it's really cold there. Does it do it even if the machine is nice and warm?

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Yes, and not cold. I am in South Louisiana. I just replaced a cracked head, but the engine runs fine. Even at full speed, I can track slow, but when I try to move a little faster, it bogs down. I did not try, but believe it would kill the engine if I didn't ease up on the tracks. Any idea? I really appreciate the help. thanks,

JohnB said:

Yes, and not cold. I am in South Louisiana. I just replaced a cracked head, but the engine runs fine. Even at full speed, I can track slow, but when I try to move a little faster, it bogs down. I did not try, but believe it would kill the engine if I didn't ease up on the tracks. Any idea? I really appreciate the help. thanks,

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Did it do it before the head replacement?
Drive does pull a lot of power from the engine, but it shouldn't really pull the engine that far down to stall unless you are really pushing it up a steep hill.

Tazza said:

Did it do it before the head replacement?
Drive does pull a lot of power from the engine, but it shouldn't really pull the engine that far down to stall unless you are really pushing it up a steep hill.

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I just bought it used with the cracked head. It still ran, but I only tracked it a short distance. I do not think it boged down even with the cracked head. Ground is level. Would replacing the head have changed anything like the timing of the injector pump? The engine runs very smooth at all RPMs. When it bogs down, there is black smoke, which I think means it is getting enough fuel, is that right? Any other thoughts? thanks,

JohnB said:

I just bought it used with the cracked head. It still ran, but I only tracked it a short distance. I do not think it boged down even with the cracked head. Ground is level. Would replacing the head have changed anything like the timing of the injector pump? The engine runs very smooth at all RPMs. When it bogs down, there is black smoke, which I think means it is getting enough fuel, is that right? Any other thoughts? thanks,

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On flat ground, it should easily move at full speed without bogging down that much.
Black smoke means it's getting fuel, but not enough air to burn it ull up, excessive load or a bad spray pattern. Does it start easily? no long glows to get it to fire up?
I'd strart with the simple things, air filter. It may run good without load, but when under load is when you notice power loss.
I can't really see anything else that could have gone that wrong with doing a head. Valce clearance is about all you need to re-set.

keep in mind that this is the nature of the beast , not sayining there is not an issue but early model bc exv were notorious for travel issues, HENCE the e series we can finnally compte,, i like what i see. as to travel issues on 341, there were some changes to improve travel performance none amounted to a hill o beans, my advice if only in travel live with it exv never really were made with a road gear anyway,,

7LBSSMALLIE said:

keep in mind that this is the nature of the beast , not sayining there is not an issue but early model bc exv were notorious for travel issues, HENCE the e series we can finnally compte,, i like what i see. as to travel issues on 341, there were some changes to improve travel performance none amounted to a hill o beans, my advice if only in travel live with it exv never really were made with a road gear anyway,,

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I remember having a hard time finding the valve clearance setting. I can re-check. Do you know what it should be or a good web site to find it. Do you think if it is off, the engine would run good and only bog when under strain? I'll also check the air filter. It does start very easy. thanks so much,

JohnB said:

I remember having a hard time finding the valve clearance setting. I can re-check. Do you know what it should be or a good web site to find it. Do you think if it is off, the engine would run good and only bog when under strain? I'll also check the air filter. It does start very easy. thanks so much,

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Incorrect injection pump timing would be my first guess. I assumed you checked compression,as that would rule out a few things and have good fuel in tank. So, are saying that you have no smoke when digging/plowing hard or tracking slow? The only time I get engine bogging down is standing start when I hit rabbit speed, and it recovers quickly at that. Not sure what shape the machine is in, but I would change out drive motor oil.

melli said:

Incorrect injection pump timing would be my first guess. I assumed you checked compression,as that would rule out a few things and have good fuel in tank. So, are saying that you have no smoke when digging/plowing hard or tracking slow? The only time I get engine bogging down is standing start when I hit rabbit speed, and it recovers quickly at that. Not sure what shape the machine is in, but I would change out drive motor oil.

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I am going to do some digging tomorrow. I'll try changing he drive oil first. Let you know if it works. thanks,

JohnB said:

I am going to do some digging tomorrow. I'll try changing he drive oil first. Let you know if it works. thanks,

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What model engine does it have? i may have a file with it in.

Tazza said:

What model engine does it have? i may have a file with it in.

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Kubota V2003T. Did some digging this morning and it does bog a little and blows black smoke when strain. So not just when tracking. I will check the valve lash and check compression. Do you think it is sounding more like a fuel problem with the black smoke. I know very little about injector pumps. thanks,

JohnB said:

Kubota V2003T. Did some digging this morning and it does bog a little and blows black smoke when strain. So not just when tracking. I will check the valve lash and check compression. Do you think it is sounding more like a fuel problem with the black smoke. I know very little about injector pumps. thanks,

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guess athought ------all the 442's I have come in contact with have Duetz engines -------on the Duetz engines there are about three different thickness of head gasket and you have to have the correct one or compression will be effected ----------- the 442 hydraulics can be a nightmare to deal with

Fishfiles said:

guess athought ------all the 442's I have come in contact with have Duetz engines -------on the Duetz engines there are about three different thickness of head gasket and you have to have the correct one or compression will be effected ----------- the 442 hydraulics can be a nightmare to deal with


Deutz


Engine type
BF4M1012E




Deutz


Engine type
BF4M1012E

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Compression 500 on all cyl. Re-checked valve lash, .007 is what I could find on the Kubota V2003T. Would the only other thing be fuel? Would the bog down and black smoke be too much fuel or too little. Is there any adjustment beside timing the injector pump with shims? It starts so easy and runs so smooth. Thanks so much Guys,

JohnB said:

Compression 500 on all cyl. Re-checked valve lash, .007 is what I could find on the Kubota V2003T. Would the only other thing be fuel? Would the bog down and black smoke be too much fuel or too little. Is there any adjustment beside timing the injector pump with shims? It starts so easy and runs so smooth. Thanks so much Guys,

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Compression seems very good...the only things left would be fuel related...fuel pump pressure, timing via shims, injectors (according to a troubleshooting chart I have on a 2203v Kubota). You made sure the air cleaner was clean and nothing crawled in there...? You aren't losing any engine oil? I would think if bad diesel, you'd get smoke at idle too...

melli said:

Compression seems very good...the only things left would be fuel related...fuel pump pressure, timing via shims, injectors (according to a troubleshooting chart I have on a 2203v Kubota). You made sure the air cleaner was clean and nothing crawled in there...? You aren't losing any engine oil? I would think if bad diesel, you'd get smoke at idle too...

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Don't think I am losing any engine oil, but will monitor. I think I will drain the fuel and put fresh. Do you recommend any type of fuel additive to help clean the injectors? thanks,

JohnB said:

Don't think I am losing any engine oil, but will monitor. I think I will drain the fuel and put fresh. Do you recommend any type of fuel additive to help clean the injectors? thanks,

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Maybe someone with experience in diesels can chime in...I am not a fan of additives other than seafoam and that was to clean the throttle body on my car.

melli said:

Maybe someone with experience in diesels can chime in...I am not a fan of additives other than seafoam and that was to clean the throttle body on my car.

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Sorry for the delay, glad you found the valve clearance.
From the engine model you gave, that is a turbo charged one? the -T usually means turbo.
I'm wondering if the turbo isn't working properly. If it isn't, it would explain the problems. Less power, black smoke as there isn't enough air getting forced in.
Black smoke means there is heat to get ignition, but not enough air or bad spray pattern causing the fuel to not burn fully.