1992 743b speed

[waynemags]

is there any way to get the engine speed a little higher on a 1992 743b? runs fine just seems to be a little slow. theres lots more power available if you pull the governor, i think thats what it is. can i adjust something to get a few more rpms

 

[Mikefromcny]

I wouldnt mess with it at all. Its a good reliable motor, designed to run at operating speed. Some live to see 10,000 hours.

 

[waynemags]

I wouldnt mess with it at all. Its a good reliable motor, designed to run at operating speed. Some live to see 10,000 hours.

it has the 40hp kubota. was upgraded. i cant remember the model number. just looking for a little more grunt out of it.

 

[Mikefromcny]

it has the 40hp kubota. was upgraded. i cant remember the model number. just looking for a little more grunt out of it.

They came with a v1702, you might of installed a v1902? I sold my 743 and got a bigger machine, figuring they still bring around $6000 here and you can get a more modern machine, higher hp, lift etc for not much more money. Something to consider.

 

[mahans7]

They came with a v1702, you might of installed a v1902? I sold my 743 and got a bigger machine, figuring they still bring around $6000 here and you can get a more modern machine, higher hp, lift etc for not much more money. Something to consider.

As per Mike, don't set it up to over rev. You'll shorten the lifespan of the engine significantly.

 

[waynemags]

As per Mike, don't set it up to over rev. You'll shorten the lifespan of the engine significantly.

i finnally got home long enough to have a look at it. it a V2203 othe rnumber on engine is 35372. i believe its 48hp.

 

[OldMachinist]

i finnally got home long enough to have a look at it. it a V2203 othe rnumber on engine is 35372. i believe its 48hp.

Have you checked to see what rpm it's running. Maybe the original application the replacement engine came from had a slower governed speed than the 2800 rpm's the V2203 normally runs in a Bobcat.

 

[waynemags]

Have you checked to see what rpm it's running. Maybe the original application the replacement engine came from had a slower governed speed than the 2800 rpm's the V2203 normally runs in a Bobcat.

ill check next time im home. any idea where a guy can get a tach to check with?

 

[OldMachinist]

ill check next time im home. any idea where a guy can get a tach to check with?

I use one of the cheap laser tachometers they sell on Ebay like this.
http://www.ebay.com/itm/Digital-Las...066?pt=LH_DefaultDomain_0&hash=item41700a1882

 

[waynemags]

I use one of the cheap laser tachometers they sell on Ebay like this.
http://www.ebay.com/itm/Digital-Laser-Photo-Tachometer-Non-Contact-RPM-Tester-Tach-Meter-/281052584066?pt=LH_DefaultDomain_0&hash=item41700a1882

thanx for the link. i ordered one

 

[waynemags]

thanx for the link. i ordered one

checked it today. rpms are 2450. im guessing im safe to increase that to 2600 or 2700. seeing as the engine is desighned to run at 2800.

 

[Bobcatdan]

checked it today. rpms are 2450. im guessing im safe to increase that to 2600 or 2700. seeing as the engine is desighned to run at 2800.

I don't have specs in front of me, but I would compare what the orginal was spec to run at. One of the big advatanges of the belt drive system on the newer machines is the engine is allowed to run at slower speeds compared to a direct couple. I don't know off hand if 40 series ran at higher rpms, but I think it is something to consider. Wheter it would really affest pump life, those have an rpm range they are design to run it

 

[waynemags]

I don't have specs in front of me, but I would compare what the orginal was spec to run at. One of the big advatanges of the belt drive system on the newer machines is the engine is allowed to run at slower speeds compared to a direct couple. I don't know off hand if 40 series ran at higher rpms, but I think it is something to consider. Wheter it would really affest pump life, those have an rpm range they are design to run it

im guessing you mean the pump rpm correct?

 

[Bobcatdan]

im guessing you mean the pump rpm correct?

I was saying newer bobcats engines run at slower rpm then other machines. Using the belt drive they can spin the pumps faster then the engine speed. I'm probably over thinking this, but I'm saying match the current engine rpm to what was the stock engine spec to be on the safe side because I don't know how much the pumps are going to like overspeed.

 

[waynemags]

I was saying newer bobcats engines run at slower rpm then other machines. Using the belt drive they can spin the pumps faster then the engine speed. I'm probably over thinking this, but I'm saying match the current engine rpm to what was the stock engine spec to be on the safe side because I don't know how much the pumps are going to like overspeed.

i gotcha. ya im tryin to find some info online about it. i know that engine is 2800rpm. as far as the 743 im not 100percent sure what was the desighned rpm limit. maybe someone will see this and give me some insight. machine runs perfect, just seems to be a little underpowered. lacks the grunt. i moved from a gas 30hp 620. it almost felt more powerfull. see what gives if i can find some info

 

[reaperman]

i gotcha. ya im tryin to find some info online about it. i know that engine is 2800rpm. as far as the 743 im not 100percent sure what was the desighned rpm limit. maybe someone will see this and give me some insight. machine runs perfect, just seems to be a little underpowered. lacks the grunt. i moved from a gas 30hp 620. it almost felt more powerfull. see what gives if i can find some info

Moving from a 30 hp gas to a 2203 should be night and day, even at 1/2 throttle. More rpms probably aren't the answer. Remember with bobcats, traction seems to be more of a issue than power. Higher rpms, a lot of time just means you can spin the wheels easier. I cant speak for the 2800 rpms you claim the engine puts out. But I will say every bobcat I have run with a keyless entry system that shows constant rpms, always reads in the 2450-2500 range.

 

[Jimbob]

Moving from a 30 hp gas to a 2203 should be night and day, even at 1/2 throttle. More rpms probably aren't the answer. Remember with bobcats, traction seems to be more of a issue than power. Higher rpms, a lot of time just means you can spin the wheels easier. I cant speak for the 2800 rpms you claim the engine puts out. But I will say every bobcat I have run with a keyless entry system that shows constant rpms, always reads in the 2450-2500 range.

The 743 ran a vane pump where the newer Bobcats run a gear pump as the main hydrostatic drive.In my opinion the vane direct drive setup was more reliable and had better longevity than the current belt setup.You just had to remember to grease the unijoint which many people didn't do.I think WOT was about 2800 for the v1702 so you should be ok increasing the rpm.Manufacturer's have obviously learnt nothing since they made the 743 because IMO the current skids aren't half what that machine was!!

 

[waynemags]

The 743 ran a vane pump where the newer Bobcats run a gear pump as the main hydrostatic drive.In my opinion the vane direct drive setup was more reliable and had better longevity than the current belt setup.You just had to remember to grease the unijoint which many people didn't do.I think WOT was about 2800 for the v1702 so you should be ok increasing the rpm.Manufacturer's have obviously learnt nothing since they made the 743 because IMO the current skids aren't half what that machine was!!

i may just leave it where it is. i also use a new bob cat 72inch bucket with bolt on cutting edge. extra weight there. bucket is fairly beefy. no problems with machine really. runs well, starts well, no leaks anywhere. hasnt missed a beat yet. if i have that bucket loaded to the max it will lift about half way up then stop. but again its a big deep bucket loaded to the max with mix og 1inch and bigger gravel and dirt. prob pretty heavy load. thanx everyone for the input.

 

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i may just leave it where it is. i also use a new bob cat 72inch bucket with bolt on cutting edge. extra weight there. bucket is fairly beefy. no problems with machine really. runs well, starts well, no leaks anywhere. hasnt missed a beat yet. if i have that bucket loaded to the max it will lift about half way up then stop. but again its a big deep bucket loaded to the max with mix og 1inch and bigger gravel and dirt. prob pretty heavy load. thanx everyone for the input.

a bucket that big should only be for snow. it's too big for the machine.