possible low breakout pressure/lift pressure

[crapola82]

I was digging out a stump today and it seemed like the machine i recently purchased was a little on the weak side as far as breakout force/lift pressure goes. I have used a 1998 mustang 2040 (similar size to my 751) and it had no problem lifting the back of the machine off the ground when the bucket was under a non moving object. My new machine (751) was not really able to lift the back of the machine off of the ground when wedged under the stump. I did notice the hydraulic fluid was at the lowest part of the dipstick. Any thoughts?

 

[thetool]

Seems to me that lift should go over relief before the rear wheels come off the ground, but tilt curling back should be able to lift the rear. This would be a safety issue.
It can also vary with different buckets, for example, a low profile bucket is longer horizontally than a C&I bucket, so the C&I bucket would be better able to lift the rear when hooked into an immovable object.
That's not saying that something isn't wrong with your 751 lift circuit relief, but if it's otherwise working okay but just won't lift the rear, I don't think that's a problem.

 

[Tazza]

Seems to me that lift should go over relief before the rear wheels come off the ground, but tilt curling back should be able to lift the rear. This would be a safety issue.
It can also vary with different buckets, for example, a low profile bucket is longer horizontally than a C&I bucket, so the C&I bucket would be better able to lift the rear when hooked into an immovable object.
That's not saying that something isn't wrong with your 751 lift circuit relief, but if it's otherwise working okay but just won't lift the rear, I don't think that's a problem.

I have to agree with the tool, the machines are pretty well balanced. The only way i can get my rear wheels off the rgoung is dig into a pile of dirt and curl the bucket back. I can't get the wheels off the ground using the lift arms alone.
If you are concerned, hook a pressure gauge to a quick coupler and engage your aux hydraulics. You should get around 3,000 PSI if not your relief may be set incorrectly or have something stuck in it.

 

[crapola82]

I have to agree with the tool, the machines are pretty well balanced. The only way i can get my rear wheels off the rgoung is dig into a pile of dirt and curl the bucket back. I can't get the wheels off the ground using the lift arms alone.
If you are concerned, hook a pressure gauge to a quick coupler and engage your aux hydraulics. You should get around 3,000 PSI if not your relief may be set incorrectly or have something stuck in it.

Thanks for the info guys. It seems to be working ok. I will run it the way it is unless it gets worse.