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12barber12
Member
- Joined
- Jun 8, 2011
- Messages
- 33
Again thank you guys for putting the effort in to help me fix the problem I greatly appreciate it
Towable backhoe
- Thread starter 12barber12
- Start date
- Views: 64451
tcreeley
Elite Member
dfkrug
Super Member
- Joined
- Feb 3, 2004
- Messages
- 7,529
- Location
- Santa Cruz Mtns, CA
- Tractor
- 05 Kioti CK30HST w/ Prairie Dog backhoe, XN08 mini-X
Yeah, my CADDigger was too slow also. If I had kept it, I was going to to what
you did. 2-stage pumps make a lot of sense in this application. Glad it worked.
chad22
Veteran Member
I guess they do work on backhoes then. Good to know. That's the same kind of pump I was gonna put on my excavator, (Since they had one at Tractorsupply) But didn't think it would work right. So I ordered a pump on ebay, turns out it was the wrong one and required more hp. I decided to keep it though as It was only $60.00 for a $300.00 pump. (Might make a logsplitter with it) I have a mazda B2000 pickup truck engine that will power it.
Then that's when I went looking again on ebay and came across the cheap pump.
Chad
chad22
Veteran Member
No Problem. Hope you get it working. The backhoes are a lot of fun. I'm always trying to find uses for mine.
Chad
J_J
Super Star Member
- Joined
- Sep 6, 2003
- Messages
- 18,952
- Location
- JACKSONVILLE, FL
- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
It only takes about 8 HP to get 4 GPM at 3000 psi.
There is no advantage what so ever in using a two stage pump.
The two stage pump will be switching back and forth with the pressure with no load or little load and be slow when you really need the muscle.
If you want power, go for the single stage pump.
There is no advantage what so ever in using a two stage pump.
The two stage pump will be switching back and forth with the pressure with no load or little load and be slow when you really need the muscle.
If you want power, go for the single stage pump.
tcreeley
Elite Member
I used a 2 stage at the time because I was in the middle of doing a log splitter and had the 2 stage 11 gpm pump. I was getting frustrated with how slow my backhoe was with a 1.2 gpm that I thought why not. It made a huge difference in speed. What does happen is that I break the lower cylinder pin from stress cracks and bends in the steel- I'm cheap and have bought a cold rolled rod and cut and drill myself a new pin when I need it. I had the backhoe rewelded when I split the horizontal 2 x 1/4" square tubing that served as the cross member for my out rigger supports. Slow split- I wanted to finish the job before I had it welded - about 2 ft. It was like having a built in spring seat for a while! Solid now! Even though a mini back hoe is small- it still exerts a good deal of force. Many home builds are not beefy enough to hold up. They should be absolutely rigid with out any flex possibility.
dfkrug
Super Member
- Joined
- Feb 3, 2004
- Messages
- 7,529
- Location
- Santa Cruz Mtns, CA
- Tractor
- 05 Kioti CK30HST w/ Prairie Dog backhoe, XN08 mini-X
The SurplusCenter calculator says you need about twice that power when
using a gas engine for that kind of flow/pressure.
To move my 3" cylinders fast enough under low load condition would
require more flow than I had, and my 10hp Tecumseh did not have the
power to pump that kind of flow at my relief setting.
A two-stage would have solved my problem with such a weak motor
and large cylinders.
J_J
Super Star Member
- Joined
- Sep 6, 2003
- Messages
- 18,952
- Location
- JACKSONVILLE, FL
- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
Hp to drive hydraulic pump = Psi x GPM / 1714
3000 x 4 / 1714 = 7.001 HP
Pumping = 1 Hp = 1 GPM x 1500 Psi
Electric hyd HP
flow rate (US gal/min) × pressure (psi) / 1714
= 550 ft·lbf/s
= 745.699872 W = 1HP
3000 x 4 / 1714 = 7.001 HP
Pumping = 1 Hp = 1 GPM x 1500 Psi
Electric hyd HP
flow rate (US gal/min) × pressure (psi) / 1714
= 550 ft·lbf/s
= 745.699872 W = 1HP
Last edited:
Iplayfarmer
Super Member
As I understand, JJ, those are pure conversion numbers that don't take into account any kind of mechanical losses.