743b weak hydarulics? Normal?

[dirtyb115]

Hi all. I finally got some seat time on my 743 b this past weekend, used it for about 6 or 7 hours to clear some brush and small trees. I used to have a 763, so not really sure if the power on this 743 is normal or if something is wrong. It spins the wheels just fine, but Im wondering about the lift and tilt. On my 763 if i got under a small stump and tried to lift the arms up it would take the rear wheels off the ground. When i do the same thing on the 743 it does not lift the rear wheels off the ground and it also doesn't really bog the engine down. Is this normal or is something wrong? It was able to lift full buckets of dirt and concrete chunks with ease, just noticed it when trying to pull up roots / small stumps. Thanks! Dave

 

[Bobcatdan]

I would check system relief pressure and pump gpm output. Relief may be low, pressure equals power, flow equals speed. Do not adjust releif over spec, I thinks those are 3000 psi, going over can wreck stuff over time. A 763 will lift more, but that being said 743 are tough old goats and normally will lift more then is safe.

 

[dirtyb115]

I would check system relief pressure and pump gpm output. Relief may be low, pressure equals power, flow equals speed. Do not adjust releif over spec, I thinks those are 3000 psi, going over can wreck stuff over time. A 763 will lift more, but that being said 743 are tough old goats and normally will lift more then is safe.

Thanks for the reply Dan. So what all is involved in the above procedure? What all will I need gauge, tool wise?

 

[Bobcatdan]

Thanks for the reply Dan. So what all is involved in the above procedure? What all will I need gauge, tool wise?

Normally I check pressure at the aux coupler. I have a gauge adaptered to plug right into the female coupler. To check pump flow I use a flowmeter plugged into the aux couplers.

 

[Tazza]

Normally I check pressure at the aux coupler. I have a gauge adaptered to plug right into the female coupler. To check pump flow I use a flowmeter plugged into the aux couplers.

I don't think my 743 will lift the back wheels off the ground either. It could be the weight distribution difference. The hydraulic pump will not bog the machine down much, the engine can easily handle the load, the drive system can pull it down though.
It sounds normal to me. As long as it can still lift a good load of dirt, sounds like it's pretty good.
As Dan said, if you're worried, get a quick coupler and gauge. Put it in your aux hydraulic coupler and operate the hydraulics, you should get about 2,400PSI.

 

[dirtyb115]

I don't think my 743 will lift the back wheels off the ground either. It could be the weight distribution difference. The hydraulic pump will not bog the machine down much, the engine can easily handle the load, the drive system can pull it down though.
It sounds normal to me. As long as it can still lift a good load of dirt, sounds like it's pretty good.
As Dan said, if you're worried, get a quick coupler and gauge. Put it in your aux hydraulic coupler and operate the hydraulics, you should get about 2,400PSI.

Thanks for all the input guys, much appreciated!

 

[BobCat]

Thanks for all the input guys, much appreciated!

My 743B won't lift the rear off the ground either. The 763 I had before had calcium chloride filled rear tires and I could easily lift the ass end off of the ground. I just think the 743 is at it's lifting capacity and like Taz said it has a much shorter wheel base.