Powerfab hydraulics - servicing ?

[RichS]

Hi all,

My Powerfab really needs a couple of new hoses and a hydraulic system checkover.  The main first arm (boom?) seems to have some sort of leak (internal?) that causes it to 'droop down' as I'm using it.  Are there any service agents that anyone can suggest that I could take the machine to to sort it out.  I know that it may be cheaper to buy the component parts myself but both time and appropriate knowledge/tooling defeats that for me.  I am going to undertake basic mechanical issues such as pin/bush replacements myself.  Will travel some distance if required.

Cheers, RichS

[David Chandler]

Depends where you are

thats why I put area at end of emails

 

Dave C

Chesterfield

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[Rspblake]

You would be better off fixing yourself as it could turn in to hundreds.

Which model version and which control setup?

If South London area then I can send you a contact no for some help in Redhill.  

I think you might be advised to replace what you can ( hoses) and then ask someone to look at it, why put an extra 30 / 40  per ram on the job, removing clamps and hoses and fitting when it's within most people's scope.

If you tipex the old hose before removing you can transfer to the new hose for clamp position.

There are non return pilot valves on some controls, but it quite possible it's just a ram seal gone, move that ram to a different position to check whether it's the control slice or the ram when you re-hose. 

 

Rob

 

Sent from my iPhone

[RichS]

good point Dave - I'm near Datchet in Berks (between heathrow and Slough !)

realise I may not find help locally but happy to travel for good service

Cheers. RichS

Datchet, Berks

===

[Anthony Skilton]

Hoses can be found everywhere including ebay.....   http://www.ebay.co.uk/itm/Hydraulic-Hoses-Made-to-Order-/330521990453?pt=LH_DefaultDomain_3&hash=item4cf4a55535#ht_481wt_832

Anthony

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[Anthony Skilton]

http://www.ebay.co.uk/itm/HYDRAULIC-HOSE-ASSY-Made-to-order-GOOD-PRICE-/261104016045?pt=LH_DefaultDomain_3&hash=item3ccb031aad#ht_2407wt_812

On Fri, Sep 28, 2012 at 1:49 AM, RichS <jollyni...@aol.com> wrote:

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[Rspblake]

I got a complete set of hoses for my 125w from here!

Pete Wilcox

Camthorne LTD

Office Telephone 01782 745588

Fax 01782 745589

e-mail st...@camthorne.co.uk

Website www.camthorne.co.uk

Delivery and ordering was easy beginning of the year. 

Gives you another supplier to get a costing from, once you have a list just send them a email. 

[Anthony Skilton]

Yes indeed, thanks.

[RichS]

Gosh, many thanks for all the helpful replies here - I have just got back from a week away in Scotland.

I will make a list of all hoses needing replacing (lengths and fittings) and get some quotes. pardon my ignorance on this but in simple terms if I disconnect a coupling won't all the fluid leak out, and then when I connect up again what about airlocks and refilling the pipes ?

My Powerfab is a 1250 but there seems very little other information on these.  I had a look at a 125WT recently and a lot of the basic system does look very similar so I can only guess that Powerfab used many similar components over the years.  That is a good idea about swopping rams (if they are the same) to see where the leakage may be occuring but again if I disconnect what about fluid loss and repurging ?  I read on here about 'control slices' and am confused what this means.

Rob- I'm not far from South London and Redhill isn't far so I would appreciate knowing who can help from there.  I got the digger to help out my part time 'odd-jobbing' business and have done quite a few jobs already ...shifting a few tons of earth, ripping out some old tree stumps (it did whine a bit doing that !) and digging a large duck pond for a friend (7m x 4m x 1m deep).

By the way, I'm don't think I'm working this forum very well as I get confused where to click to reply to posts, but just hope I get something posted !

many thanks again to all,

RichS

(Datchet, Berks)

On Saturday, September 29, 2012 7:47:15 AM UTC+1, Antstrad wrote:

Yes indeed, thanks.

On Fri, Sep 28, 2012 at 5:47 PM, Rspblake <rspb...@aol.com> wrote:

I got a complete set of hoses for my 125w from here!

Pete Wilcox

Camthorne LTD

Office Telephone 01782 745588

Fax 01782 745589

e-mail st...@camthorne.co.uk

Website www.camthorne.co.uk

Delivery and ordering was easy beginning of the year. 

Gives you another supplier to get a costing from, once you have a list just send them a email. 

On 28 Sep 2012, at 16:50, Anthony Skilton <ajsk...@sky.com> wrote:

http://www.ebay.co.uk/itm/HYDRAULIC-HOSE-ASSY-Made-to-order-GOOD-PRICE-/261104016045?pt=LH_DefaultDomain_3&hash=item3ccb031aad#ht_2407wt_812

On Fri, Sep 28, 2012 at 1:49 AM, RichS <jollyni...@aol.com> wrote:

Hi all,

My Powerfab really needs a couple of new hoses and a hydraulic system checkover.  The main first arm (boom?) seems to have some sort of leak (internal?) that causes it to 'droop down' as I'm using it.  Are there any service agents that anyone can suggest that I could take the machine to to sort it out.  I know that it may be cheaper to buy the component parts myself but both time and appropriate knowledge/tooling defeats that for me.  I am going to undertake basic mechanical issues such as pin/bush replacements myself.  Will travel some distance if required.

Cheers, RichS

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[Anthony Skilton]

Fluid is cheaper to buy from ie, ebay item Item number: 350284769747

Mine bled itself very quickly when first started up after rebuilding so shouldn't be a problem. Maybe others would know more or better than me as I'm no expert :O)

Anthony

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[RichS]

Thanks Anthony,

How do you bleed the system - is there a bleed valve or does it do it automatically or do you have to start up with hoses slightly loose until oil spurts out and then tighten quickly ? !! Thanks for recommended oil, just about to order some and see that they also do one titled for diggers (Ebay Item number: 350398760134 ) - do you know if these the same or which is better ?

Thanks RichS

Datchet, Berks

[David Chandler]

just fill hydraulic tank up and work one ram at a time from fully extended to fully retracted then top up oil again then move to next lever/ram and do same ALWAYS KEEP AN EYE ON OIL LEVEL when all done work them all again let everything settle and check oil

I get my oil (hydraulic 32 ) from my local suppliers if stuggling and want to compair prices try truck spares shop or plant and equipment firm

 

Dave C

Chesterfield

From: RichS <jollyni...@aol.com>
To: diggers-du...@googlegroups.com

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[rspb...@aol.com]

Hydraquip

11 Holmethorpe Avenue

Redhill

RH1 2NB

01737 781080

Contact Steve

Possibly if you mention you been talking with Rob Blake from repro-link and its about working on a powerfab digger, might take a look if not over there head with work...

As Antony and David have said 

It's a self bleeding system provided the hydraulic oil is above the level of the pump, allowing it to be viewed in the eye glass is the safest way to make sure there is oil at the pump, although you can still be below and have oil at the pump.

Hydraulic oil Iso 32 are mostly the same but you can get better maker and additives, bit like car petrol, they all do the same job but some bull s..t more.

I would get some surgical gloves that are oil resistant and a few elastic bands as you disconnect the hose slide the glove over and wrap the band to seal, will lose a little oil but not everywhere and cut a finger do the same on the ram threaded part.

Balloons work and if clever get a few different colours use a colour on hose and ram connection and different on the other hose.

Take pictures easy to look back if needed.

Making sure the digger bucket / blade ram is on floor so rams are not supporting any weight, before releasing hose.

Two hoses connect to a ram and the same slice if operation a different way than control diagram then exchange hoses.

Basically the slice is just one section of the control block, on a control block you have pump (high pressure) in and return which is (low pressure) back to the tank out. Via Cbv and oil cooler on some.

Moving one of the levers moves a shaft which opens ports in the slice and diverts pressure down 

and returns via the ram, other sections control total pressure (pressure relief) also some have pilot valves (directional valve) there're also Cbv counter balance valves that make sure that if the bucket has weight that its controlled load travel and also if engine stops holds position.

I would pull the bucket ram and the boom ram and exchange see if the bucket drops.

You can get a tipex pen and mark the hose if not sure which hose to where.

If boom still dropping then its in the slice.. Need closer pictures of control block 

Could be pilot 

Think it will be a ram seal though. 

Rob

[Anthony Skilton]

Rich

I think the grade 32 is the one required. I see Rob and Dave have given detailed info for us all, thanks !

Anthony

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[RichS]

Many thanks again to all for so much help - and Rob many thanks for such detailed advice - I feel a lot more confident and understanding now to undertake the hose replacements/repair.  I bought a 25L container of oil from the ebay seller and it arrived the next day.

I've had a big problem today while using the digger, meant to have been the last job before carrying out the overhaul and now it is stranded away from home !  I'll start a new thread on that to keep it separate from all this useful info, and that being a separate issue may get some wider ideas.

Cheers, RichS (Datchet, Berks)

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Anthony

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