hydraulic post driver help

[docshannon]

Hi there, have a few questions for a shaver HD post driver. It works when hooked up to the rear remotes on my tractor, but I wanted more hit strength so I plumbed a larger line for the return directly back to the hydraulic reservoir through the fill port. Thing is, now it won't do anything. Any ideas?

 

[oldnslo]

Did you try moving the lever on the directional valve feeding the rear remotes both ways?

 

[J_J]

Your return should have been going to the fill hole anyway.

Since you didn't change the input, it should work as before.

Did you bungee the remote valve open?

You can bypass the remote valve and put a QD on the PB line coming into the remote valve. Then just plug the post pounder into the PB QD,

Does your post pounder have a PB port. If it is a Gresen valve, it probably does.

The hyd doesn't affect the pounder potential, it is the springs and weight that does the job.

The hyd just pushes the cyl up and moves the tilt, etc.

Only things that will increase pounding potential is stronger springs and more weight.


Impact at Full Stroke

HD-8---30,000 lbs.

HD-10---71,500 lbs.

HD-12---100,000 lbs.

Shaver | Standard Post Drivers

 

[RedNeckRacin]

IF you want it to hit harder, a larger spring and more weight would be a big help once you get the hydraulics figured out.

 

[docshannon]

Thanks for the replies! Was told the hitting force would be less because the smaller return would not let the valve dump fast enough. Yes it's a gresen valve, and yes I bugged the remote valve open. Thought about bypassing bypassing the remote valve but kind of in a a crappie spot. Works good up and down when plugged into the remotes.

 

[RickB]

Thanks for the replies! Was told the hitting force would be less because the smaller return would not let the valve dump fast enough.

That is true. Everything else J_J told you is also true.

 

[J_J]

If your valves are sized for the pump flow, that is the best you can do.

The hose size should be matched to the port size and fittings also.

If you have QD's, they might slow you down.

How old is the Shaver? The springs could be weak from prior use.

 

[DT86]

IF you want it to hit harder, a larger spring and more weight would be a big help once you get the hydraulics figured out.

One of the best things I ever did was to replace both springs on our HD10. Night and day difference.

I've seen people run them without the springs. I had one spring holder break and thought I could get the job done with one spring. It didn't take but one post to scrap that idea.

OP, is it possible you have the tractor valve bungeed in float, been there done that. Swap outlets and bungee it the other way.

 

[docshannon]

Hi, I just replaced both springs and the whole piston/tube assembly. Seems a bit slower, and yes, it's very old. Used to have it on an International Have mounted on front, now on a belarus on the three point. Used to drive 8 inch pointed post no problem, now they only go in about a foot. Confused on why it doesn't want to work plumbed to the reservoir and why it seems to not be pounding very hard?

 

[J_J]

Are you using the PB port?

Is there any restrictions between the sliding weight and the frame?

Troubleshooting
NOTE: Refer to the Service Parts section of
this manual for a photo and description of all
the parts.
Problem: Drive ram (A1) will not move or
slide freely on main carriage
channel (B1).
Possible Cause/Solution(s):
1. Guide blocks (A2) lack lubricant. Lubricate
with clean engine oil.
2. Guide blocks (A2) installed incorrectly.
Refer to Service Information section
assembly procedures for correct
orientation.
3. Incorrect clearance between main carriage
channel (B1) and drive ram (A1) I-beam.
Refer to Service Information section for
clearance specifications.
4. Hydraulic drive cylinder assembly (C1) is
not parallel to main carriage channel (B1).
Refer to Service Information section,
hydraulic drive cylinder installation, and
parallelism adjustment.
5. Main carriage channel (B1) or drive ram
(A1) is bent or damaged. Discontinue use
and order replacement parts.
Problem: Poor performance, low or no
impact, hydraulic drive cylinder will
not extend.
Possible Cause/Solution(s):
1. Weak or broken drive ram springs (C14).
2. Broken lower spring bracket (C13).
3. Bent or damaged hydraulic drive cylinder
assembly (C1).
4. Main carriage channel (B1) is binding.
5. Restricted or plugged hydraulic hose(s)
(G15, G17, G20).
6. Low or no hydraulic pressure or flow from
the machine or power source.
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