My post hole digger, running on an old skidsteer (18gpm) doesn't seem to have any torque. The PHD drive is a roller stator motor. Took the qd's out, but now wondering how to check flow on the aux circuit. Fluid level is full, all other functions (lift and curl) work ok.
PHD lost torque
- Thread starter augerin
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CincyFlyer
Veteran Member
You can bung up the return line and see if the pump deadheads. You can also put the return line in a bucket and measure the flow (and reuse the oil). That's if you don't have a pressure gauge to put in the system right in front of the motor ...
oldnslo
Super Member
Does the PHD spin at the proper speed under no load or minimal load? If yes then you receiving full flow to the motor.
Does the motor on the PHD get hot rather quickly when under load? If yes this would point towards the motor leaking or bypassing flow internally.
Does it sound like the hydraulics are building pressure ? I.e. Similar sound to curling the bucket full stop and hold it there briefly.
Does the motor on the PHD get hot rather quickly when under load? If yes this would point towards the motor leaking or bypassing flow internally.
Does it sound like the hydraulics are building pressure ? I.e. Similar sound to curling the bucket full stop and hold it there briefly.
I don't have a bucket that big
Pressure isn't same as flow, is there a formula to convert?Looks close, but don't have a tach to measure it with.
Haven't checked, what is quick? 3-5 minutes How hot is too hot?
Not with PHD, but definitely with grapple digging roots/stumps.
I've got new filters on the way, but leaning towards bypass on the motor. With no load, PHD spins in both directions. Under load, it starts to drill then stalls like it's hitting a root or rock. When I check the hole, nothing to be found :shrug:
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oldnslo
Super Member
Responses are inside the quoted lines
I'll check the lines for temp change. Grapple and PHD do share the same ports. Grapple open/close time appeared to be slow. Never thought about getting a reference for it either though. That's why I'm waiting on a new set of filters, thinking flow is restricted somehow. Maybe dumb on my part, but they are due anyway. Of course, not getting the wife's fence done is quickly becoming my priority problem.
Xfaxman
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When it stalls can you hear the pressure relief valve open?
Is it hex drive to the auger or shear bolt?
Use a big pipe wrench and see if you can turn it without the skid steer running.
oldnslo
Super Member
You had better get this solved NOW
It was more complicated than expected. My buddy had been using the PHD for an extended period of time. What I did not notice was the motor was a different one, how the heck did that happen? He had an issue with his conveyor and borrowed the PHD motor. He put the wrong one back on the PHD. Instead of 1900 ft. lbs of torque on the auger, I was getting 750. It would dig ok in dirt/clay but dry clay was a nogo.
Fence is up, horse is free and wife is momentarily appeased.
