Dumper identification

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Ronan Keaveney
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Re: Dumper identification

Post #51 by Ronan Keaveney » Mon Aug 24, 2020 3:34 pm

It's in such good original condition, being kept inside out of bad weather helps a great deal though too... Mine as you can see from the 1st pictures wasn't too bad condition wise but mechanically it was very bad... everything was worn out and it was barely starting as it was ran with no diesel or air filters... The Petter engine is tough though and will keep going despite not being serviced... I will post a picture of the oil filter that came out of it... had you ever any trouble with the Marles steering box ? They are very expensive to repair!!

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Re: Dumper identification

Post #52 by Slooby » Mon Aug 24, 2020 4:18 pm

Oh those little engines are bomb proof all right, back in the 60's my dad was well used to looking after them, and their Lister cousins, in their marinised configuration when he worked on boats. That would probably be why he left it alone for the best part of 40 years until the oil turned to grease...Ours has been running on heating oil (naughty naughty), with a bit of two-stroke oil thrown in to help the valve guides, for its entire life with us.

The only attention the steering has ever had has been a new wheel bearing and some necessary repairs to the stub axle caused by the failure of the original, which caused the stub axle to shear off! All we did was take it to a local machine shop and then taught them how to repair one by drilling a hole through the hub in the centre of the stub axle and a corresponding blind hole into the remains of the stub, then tap a thread the stub axle. That allowed the stub axle to be bolted back onto the hub exactly aligned with the fracture, after which the fracture could be ground to a V groove and welded up. With the stub welded back on and machined back the head of the bolt was then ground off the back of the hub and the V groove ground between the remains of the bolt shaft and hub before being welded up. Agricultural engineering at its finest! ;)
CMN Stuff: MF65, Thwaites Nimline, JCB 3CX
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Re: Dumper identification

Post #53 by Ronan Keaveney » Tue Aug 25, 2020 3:41 pm

Great bit of engineering... whats it like to drive ? I find mine has a certain amount of vibration at certain revs, I think all the solid mounted Petter engine's are the same!... is there much free play in the steering when your driving it ? (ie , steering wandering)....

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Re: Dumper identification

Post #54 by Slooby » Tue Aug 25, 2020 5:22 pm

Yup, ours is exactly the same! Vibrates like mad in the mid rev range, but will pull anything at barely above idle and settles down into a nice even thrum flat out in top. I find there's a rather nice straight cut wine from the gearbox too, but I do rather like straight cut gearboxes :lol:

The steering has always been vague; there's about a 1/10th of a turn in free play at the steering wheel when it's static, but it's always been like that as I recall and she's never been difficult to chuck about.

When I went out to check on the steering and gave the rear wheels a wobble both rear wheel bearings are shot again! :oops: Another job that needs attention then :doh:
CMN Stuff: MF65, Thwaites Nimline, JCB 3CX
Projects: S11a 88" V8 Hybrid, 2 x S111 109"s, Mk11 Mini, Harrison L5A :doh:
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Just added: Alpine S5 & Bridgeport Mk2 :wtf:
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Re: Dumper identification

Post #55 by cobbadog » Wed Aug 26, 2020 7:40 am

I took out a fair bit of slack from the Bishop steering box on my Liner by welding up and grinding the pin back to shape. I like your one too it is a real gem with Family history.
Cheers Cobba


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Re: Dumper identification

Post #56 by Ronan Keaveney » Wed Aug 26, 2020 3:38 pm

I did something similar on the Marles steering box on the Thwaites, it was ran without oil and had water in it... the cross shaft gear and worm were very worn in 1 spot so I built it up with weld and painstakingly ground and filed it back to the original shape as best I could... New parts were very expensive, so I got away with just replacing the 2 worm bearings which still cost nearly £120... steering is pretty good now but it'll never be like a Rack and Pinion steering rack....

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Re: Dumper identification

Post #57 by Slooby » Wed Aug 26, 2020 5:41 pm

Ronan Keaveney wrote:the 2 worm bearings which still cost nearly £120


Ouch!

I take it they weren't an off the shelf bearing then that you could get the size off the shell and order from a 'Bearings R Us' shop?

We've just returned the Yanmar YB201U excavator we had been borrowing having just put £600 into it rebuilding 2 rams, getting a new hydraulic hose, replacing the main boom ram pin (which had to be custom made from EN8 by Evans & Reid) and bush, putting in 15 litres of oil into the hydraulic system (it uses 15W40 Mineral oil not specific Hydraulic oil), getting 2 dummy pins for the bucket, replacing all the rubber fuel hoses, fixing the fuel bleed banjo fitting on the injector pump and me knocking up some HMWPe spacers and bushes for the bucket because it is shot. Frustratingly it's owner called this morning desperate to borrow it back just as we were refitting the rams, so we literally just got to fire it up and take it back to him rather than actually carry on using it having fixed it!
CMN Stuff: MF65, Thwaites Nimline, JCB 3CX
Projects: S11a 88" V8 Hybrid, 2 x S111 109"s, Mk11 Mini, Harrison L5A :doh:
Ish projects: T25 Camper, ST675R
Just added: Alpine S5 & Bridgeport Mk2 :wtf:
Sorely Missed: Impreza, E39 M5

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Re: Dumper identification

Post #58 by Slooby » Wed Aug 26, 2020 5:53 pm

The Yanmar in question:

Image

The state of the completely wrong fit bucket for the machine

Image

And without access to anything other than woodworking tools how I cludge together my soacers and bushes from HMWPe (500 grade off cuts from cutting boards as made and sold by the family business, not engineering 1000 grade):

Image
Image

How the bucket slop was mostly taken up

Image

One broken bleedable fuel banjo

Image
CMN Stuff: MF65, Thwaites Nimline, JCB 3CX
Projects: S11a 88" V8 Hybrid, 2 x S111 109"s, Mk11 Mini, Harrison L5A :doh:
Ish projects: T25 Camper, ST675R
Just added: Alpine S5 & Bridgeport Mk2 :wtf:
Sorely Missed: Impreza, E39 M5


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Re: Dumper identification

Post #59 by Ronan Keaveney » Wed Aug 26, 2020 9:48 pm

No, not available anywhere only at David Cornwallis who specialises in rebuilding old Thwaites dumpers and who also seems to have the Marles steering box parts and repair service aswell..... that looks like an old Yanmar, possibly early 1990s.. I can see the bucket is not right for the dipper arm and a lot of wear in the pins also!. A mini digger is a great little machine round the place! They are still worth good money at 10 years old if in good condition..I work for a company that has 15 of them! Mainly Tackuchi but also some Jcb.... will you ever respray the Nimline do you reckon to its original Thwaites yellow ?

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Re: Dumper identification

Post #60 by Slooby » Wed Aug 26, 2020 11:07 pm

It is indeed an old(er) one...going by the Service Manual that I found for it that model (YB201) was made between 1985 and 1991! The machine has a mind of its own on the levers, so you have to a) have your wits about you when doing anything, b) make sure that no one or anything precious is within reach of the bucket when you are touching any controls and c) figure out how much pressure is just enough to get each lever to do what you want (and even then it can just go 'nah, I'm going flat out that way'). When we dropped it back the guys who work with its owner said they will start putting pressure on him to actually get someone in to give the hydraulics a good service so those control actuators will actually respond a bit more predictably...I won't hold my breath ;) It also could do with new pins and bushes on the kingpost to chassis mount, kingpost to boom and boom to dipper arm, plus shims and a bit of work on truing up the mating faces for said shims :roll: Not my problem though, my JCB arrives in the morning and we aim to use it for all the stuff we need :mrgreen:

I pulled the offside rear wheel and hub of this afternoon to take a look at the bearing, it looks like they maybe the original taper bearings in there, or at least really old ones. I have absolutely no idea how you are meant to get a grease gun onto the nipples on the hub, the recess is tiny! Anyway I decided to pull it apart and clean them up to identify the bearings before repacking them with grease and tightening them up a bit more. I might just get away without replacing them, but the seal didn't look too clever! (pics to follow)

While discussing what I was up to with my brother-in-law he confessed to bending the other stub axle in what sounds like a somewhat daft manoeuvre which resulted in him slipping dumper sideways down a ditch bank while trying to empty a full bucket of soil :doh: This would be the stub axle that sheared and was welded back on :think: So that will take some looking at.

Currently looking for a front and rear tyre to replace the very perished and split (I can see the innertube through one of the cracks on the rear tyre!) ones on the offside which I'm pretty sure were on the dumper in 1972 when my dad bought it!
CMN Stuff: MF65, Thwaites Nimline, JCB 3CX
Projects: S11a 88" V8 Hybrid, 2 x S111 109"s, Mk11 Mini, Harrison L5A :doh:
Ish projects: T25 Camper, ST675R
Just added: Alpine S5 & Bridgeport Mk2 :wtf:
Sorely Missed: Impreza, E39 M5


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