Ramairfreak98ss
Silver Member
I have the skid steer attach couplers on the front, also have front accessory flow lines on our 09 4720 deere... 2.4L turbo 4cylinder 66hp etc.
I plan to run this auger/post digger on the front of BOTH our 4720 tractor 11.5~gpm max
and our 2010 Deere 319D skid steer, same motor, setup but 60hp, about 18gpm flow.
We already have a land pride PTO/3pt post digger already with 9 and 15" bits for smaller stuff
Im looking ONLY to use this for potting trees and shrubs into the ground quickly with out tons of hand digging. I'm only interested in stuff thats 30-42" "tree augers" basically.
We'll use it to dig mainly softer soil but may need nice "potted holes" in clay, harder soils but nothing rock laden. I could care less about the speed or RPMS since i know both machines will have plenty of power to put this sucker into the ground. Our 4720 will burry the 15" on the rear PTO/3pt in seconds through any soil without ANY engine bog or struggle whatso ever.
Even our little "garden tractor" 27hp diesel simplicity will burry the 15" bit but doesnt have the rear massive lift capacity to remove the bit back out once its burried.
Here are specs of two units, one probably is heavier/larger hydro motor and takes a little more flow to spin the same rpms as the smaller unit. If they say recommended flow 15-30gpm and you hook the 4720 up at 11-12gpm, will it move? Will it be slower than their slowest rated RPM or have NO power to turn?
If its slow AND i can use it on the 4720, no problem, assuming the skid steer will just run it faster rpms.
Id rather get the heavier duty one. The smaller model says 10-25gpm but ONLY 30" maximum bit... why? torque? Can it run the 36 or 42" sizes just might bog the machine, break the gearbox what?
I know my little landpride on the back PTO flys... probably 60rpms at "normal" engine rpm speed, probably hits closer to 80-95rpms though when either tractor is FULL throttle/540rpm rear pto speed.
Model HDA-20: Max Auger Diameter - 30"
* Torque @ 3000 psi - 2419 ft. lbs.
* Drive - Hex Type 2"
* Weight 310 lbs.
* Drive Type - Planetary
* Gearbox Ratio - 4.08:1
*
Recommended Flow Rating of Skid Steer - 10 - 25 GPM @ 3000 PSI
10gpm =38rpms
18gpm=68rpms
Model HDA-30: Max Auger Diameter - 36"
* Torque @ 3000 psi - 3036 ft. lbs.
* Drive - Hex Type 2"
* Weight 325 lbs.
* Drive Type - Planetary
* Gearbox Ratio - 4.08:1
*
Recommended Flow Rating of Skid Steer - 15 - 30 GPM @ 3000 PSI
15gpm =45rpms
20gpm=61rpms
Whats the worst that could happen with a larger flow unit? bogs the machine more? Im sure the 11gpm on the 4720 wouldnt even stall the engine if it stopped dead. The skid steer isnt high flow, which sucks but 18gpm should still operate one easily.
I plan to run this auger/post digger on the front of BOTH our 4720 tractor 11.5~gpm max
and our 2010 Deere 319D skid steer, same motor, setup but 60hp, about 18gpm flow.
We already have a land pride PTO/3pt post digger already with 9 and 15" bits for smaller stuff
Im looking ONLY to use this for potting trees and shrubs into the ground quickly with out tons of hand digging. I'm only interested in stuff thats 30-42" "tree augers" basically.
We'll use it to dig mainly softer soil but may need nice "potted holes" in clay, harder soils but nothing rock laden. I could care less about the speed or RPMS since i know both machines will have plenty of power to put this sucker into the ground. Our 4720 will burry the 15" on the rear PTO/3pt in seconds through any soil without ANY engine bog or struggle whatso ever.
Even our little "garden tractor" 27hp diesel simplicity will burry the 15" bit but doesnt have the rear massive lift capacity to remove the bit back out once its burried.
Here are specs of two units, one probably is heavier/larger hydro motor and takes a little more flow to spin the same rpms as the smaller unit. If they say recommended flow 15-30gpm and you hook the 4720 up at 11-12gpm, will it move? Will it be slower than their slowest rated RPM or have NO power to turn?
If its slow AND i can use it on the 4720, no problem, assuming the skid steer will just run it faster rpms.
Id rather get the heavier duty one. The smaller model says 10-25gpm but ONLY 30" maximum bit... why? torque? Can it run the 36 or 42" sizes just might bog the machine, break the gearbox what?
I know my little landpride on the back PTO flys... probably 60rpms at "normal" engine rpm speed, probably hits closer to 80-95rpms though when either tractor is FULL throttle/540rpm rear pto speed.
Model HDA-20: Max Auger Diameter - 30"
* Torque @ 3000 psi - 2419 ft. lbs.
* Drive - Hex Type 2"
* Weight 310 lbs.
* Drive Type - Planetary
* Gearbox Ratio - 4.08:1
*
Recommended Flow Rating of Skid Steer - 10 - 25 GPM @ 3000 PSI
10gpm =38rpms
18gpm=68rpms
Model HDA-30: Max Auger Diameter - 36"
* Torque @ 3000 psi - 3036 ft. lbs.
* Drive - Hex Type 2"
* Weight 325 lbs.
* Drive Type - Planetary
* Gearbox Ratio - 4.08:1
*
Recommended Flow Rating of Skid Steer - 15 - 30 GPM @ 3000 PSI
15gpm =45rpms
20gpm=61rpms
Whats the worst that could happen with a larger flow unit? bogs the machine more? Im sure the 11gpm on the 4720 wouldnt even stall the engine if it stopped dead. The skid steer isnt high flow, which sucks but 18gpm should still operate one easily.