Hydraulic Post Knocker

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nat1
Posts: 3
Joined: Tue May 10, 2016 8:45 pm
Location: Derbyshire - England

Hydraulic Post Knocker

Post by nat1 » Fri Jun 21, 2019 2:56 pm

I have recently purchased a barn conversion in Derbyshire with a small plot of land to set up 2 or 3 stables for a retirement hobby / life style. I will soon be looking round for a DB885 with all the bells and whistles to support the dream. I'm going to need a fair bit of fencing and was wondering if the 885 was a suitable tractor for a hydraulic post knocker. I wil be looking for a knocker with a weight around 125kg equipped with 1 hydraulic hose fitting. I'm assuming the operation will be similar to trailer tipping but slightly faster on the down stroke! Should I have any concerns with the capability of the 885 and a post knocker and is there anything special I need to know or do with oil flows etc.
Thanks - Nat

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db2d
Posts: 2098
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: Hydraulic Post Knocker

Post by db2d » Sat Jun 22, 2019 11:44 am

There are numerous machines on the market that would be suitable for your tractor. The weight for knocking the post is lowered by gravity ( free fall )

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nat1
Posts: 3
Joined: Tue May 10, 2016 8:45 pm
Location: Derbyshire - England

Re: Hydraulic Post Knocker

Post by nat1 » Sat Jun 22, 2019 12:53 pm

Sounds good, thanks. I'll do the usual checks on rope condition, leaks, welded bits etc but are there any types of hydraulic post knocker to avoid. You mention numerous machines on the market but just my luck to pick something that's not suitable.

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db2d
Posts: 2098
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: Hydraulic Post Knocker

Post by db2d » Sat Jun 22, 2019 1:56 pm

Sorry, my experience of these machines is limited and out of date but we can address tractor issues.

Scooby
Posts: 3929
Joined: Tue Jan 03, 2006 8:16 pm
Location: Warwickshire

Re: Hydraulic Post Knocker

Post by Scooby » Sat Jun 22, 2019 4:24 pm

There are many different types of post knocker on the market as has been mentioned and the good news is that with your 885 hydraulics in good order you have a big choice. Firstly though, there is one type which doesn't use hydraulics at all save only to lift the complete machine off the ground. That is called a Tomkin and it works off the P.T.O. The weight is lifted by a wire rope and is operated by using the tractor, through the P.T.O, to lift the weight to whatever height is required up the frame and then just releasing it with a handle. This is a very basic macine and if you only have spasmodic bits of fencing to do it would suit your needs but it is a bit basic : https://www.ebay.co.uk/itm/Vintage-Tomk ... Swc6pZ62I6

The next type, e.g. Parmiter, utilises the hydraulics to lift the weight to the desired position and then the operator releases it via a control valve on the machine. This was a very popular knocker when they were first introduced and is the one that you will see more of in the s/h market. But this machine relies on the driver being able to reverse the tractor to the exact spot where the post is required. That is quite feasible and I know of a couple of fencing contractors who have used them for many years : https://www.ebay.co.uk/itm/Parmiter-Pos ... ctupt=true

The third type is made by quite a few different manufacturers and is driven by hydraulics but is also fully adjustable insomuch as the driver reverses (or travels along the line of a new fence) and the knocker can be adjusted both radially (swing it from side to side) or move it in and out and of course it can also be adjusted to a true vertical position as well. All done by the operator standing by the side of it after having positioned it somewhere near to the intended position of the post. A Wrag is a popular make of this type : https://www.ebay.co.uk/itm/wrag-post-kn ... ctupt=true

I would strongly reccomend that you DO NOT buy one of these. I do know someone who wrecked his DB hydraulics with one and it cost him quite a lot of money to get them repaired : https://www.ebay.co.uk/itm/Vintage-Tomk ... Swc6pZ62I6
ImageImage


Three is twee, four does snore, but 6 just clicks........Scooby

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nat1
Posts: 3
Joined: Tue May 10, 2016 8:45 pm
Location: Derbyshire - England

Re: Hydraulic Post Knocker

Post by nat1 » Sun Jun 23, 2019 7:33 am

Thank you very much for all the information, much appreciated.

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