Well it looks like you might be correct. Glad I asked. I did rerun some numbers w/ bigger pumps to get closer to the same torque rating but the speed would have dropped down to around 120 rpms which is probably too slow.
Power rake project
- Thread starter Zick
- Start date
- Views: 6847
Well it looks like you might be correct. Glad I asked. I did rerun some numbers w/ bigger pumps to get closer to the same torque rating but the speed would have dropped down to around 120 rpms which is probably too slow.
J_J
Super Star Member
- Joined
- Sep 6, 2003
- Messages
- 18,952
- Location
- JACKSONVILLE, FL
- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
I should ask, is the power rake for the front or back?
If you had 10 GPM for a 10 cu in hyd motor, it would run at 231 rpm. Torque 4,777 or 398 ft lbs
The hyd pump takes about 21 HP to pump 10 GPM and a pressure of 3000 psi.
With an 85 % efficiency, the 21 HP from the pump would give the hyd motor about 17.85 HP.
If you have more GPMs, you will have more rpms.
I just noticed the flow on your tractor.
Hydraulics:
Type: open center
Capacity: 3.1 gal [11.7 L]
Total flow: 6.3 gpm [23.8 lpm]
If you had 10 GPM for a 10 cu in hyd motor, it would run at 231 rpm. Torque 4,777 or 398 ft lbs
The hyd pump takes about 21 HP to pump 10 GPM and a pressure of 3000 psi.
With an 85 % efficiency, the 21 HP from the pump would give the hyd motor about 17.85 HP.
If you have more GPMs, you will have more rpms.
I just noticed the flow on your tractor.
Hydraulics:
Type: open center
Capacity: 3.1 gal [11.7 L]
Total flow: 6.3 gpm [23.8 lpm]
It's for the rear.
The total flow isn't what's available at the FEL ports from what I've read, only about 3.7gpm and it looks like the factor BX7326 rear remotes only provide the same 3.7gpm.
I've thought about getting a PTO pump but then I would have to have some kind of oil tank, filter, etc as well and then it get more complicated and cost prohibited.
So at this point, it looks like I'm going to have to go back to the PTO gearbox setup, too bad.
The total flow isn't what's available at the FEL ports from what I've read, only about 3.7gpm and it looks like the factor BX7326 rear remotes only provide the same 3.7gpm.
I've thought about getting a PTO pump but then I would have to have some kind of oil tank, filter, etc as well and then it get more complicated and cost prohibited.
So at this point, it looks like I'm going to have to go back to the PTO gearbox setup, too bad.
Even thought I ended up going with a mechanical PTO driven rake, I just found this video of a guy who build one using a rear PTO pump. It's pretty large but seems to work well.
https://www.youtube.com/watch?v=bkt7qMbsiwk
https://www.youtube.com/watch?v=bkt7qMbsiwk
