The Craftmans Shop > New from Old

It's BIG, Yellow and digs holes! JCB 3CX Project 8 is joining the Tractor Shed

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modeng200023:
Going on like this Andrew, you'll soon have a new machine with al the replacement parts you've fitted.  :D

John

awemawson:
Yes it rather feels like that John.

Once you're into something like this there's no point in not sorting out things as you find them, or they'll come back and bite you in the nether regions.

Classic example this morning - crawling about fitting that bracket I noticed that the hydraulic hose for the near side slew cyllnder had been chaffing and worn though it's outer sheath. 1/4" BSP female ends, 1050 mm long and not available from the supplier that had the plate clamp in stock, so extra postage from another supplier but £34 each and no point in not replacing both. As luck would have it I have the 1/4" BSP ends and ferrules and the hose in stock so I've crimped up a pair of hoses this morning ready for when I do the job.

awemawson:
The Replacement hydraclamp plates arrived this afternoon so I got on with sawing off the offending bolt to release the nut that's been giving me grief. By heck it was a tough bit of steel!

One hour and a half of sawing, and three reciprocating carbide tipped blades later, (using coolant as well) it was mine and the rest of the job was pretty simple. Knock out the remnants of the 38 mm old bolt - remove the old plate - and install new plate and bolt ensuring that the lug aligned with a shaped head of the bolt.

I've not at this time replaced the actual seals in the hydraclamp to avoid duplicate oil draining- I will do when I do the bolt on the other side but frankly when the bolts and nuts are undoable it should be very easy.

Lots of copper grease used on the nut and bolt when re-assembling to help the next bloke down the line.

I was rather surprised how little of the anti-rotation lug had been chewed away on the old plate. I'd wondered if I could have built it up with weld but in the end decided that it was a false economy on what is a highly stressed part.

. . perhaps do the other side at the week end depending on other pressures.
 

awemawson:
The forecast for the weekend was rain, so I decided to get on and saw off that offside hydraclamp bolt. Didn't go too badly but still took ages and several saw blades !

So having got the new plate and bolt installed (no pictures, just like the other side) I went ahead and changed the actual seals inside these upper hydraclamps - so now all four are new.

Now to get at the bolt the boom has to be slewed all the way in one direction and the carriage slid to the extreme end of the support channel. What I DIDN'T know was when slewed to 180 degrees either side, that bracket that holds the breaker hose up was fouling on the slew cylinder steel pipework that is part of the cylinder itself. Although the pipes are not leaking they have been compromised.

So now I need to work out a more satisfactory arrangement to support the 1" hose for the breaker AND a repair strategy for the slew cylinder pipes. I've taken the new bracket off and have temporarily supported the pipe with a bungee cord.

 . . . one step forward . . two back . . .  :bang:

awemawson:
OK time for a bit of lateral thinking regarding this pesky hose bracket.

There is barely an inch of available clearance between the top of the slew pots and the bottom of the hydraclamp bodies. Not much space especially as the carriage will not necessarily sit exactly horizontally due to play in its mounting. It seems the original JCB fitting routed the hose ABOVE  the carriage and had a loop to allow for side shift and the pipe was then routed into the guts of the machine. I've attached a picture of how it was supposed to be - nothing like mine !

Now I don't HAVE a breaker. I don't NEED a breaker. So why the heck go to great lengths to support its hose - take the blooming thing OFF !

So my objective this morning before watching the Coronation was to take off the hose and fit blanking adapters to where its ends were. The solid pipe running down the boom ends up on top of the near side slew pot - easy job, (well needed great force!) unscrew and blank off - job done. Now the other end terminates in a very oily lump of control hydraulics that at first I thought fixed with a standard 1" x 60 degree cone fitting. So I crawled  under only to find after much cleaning was in fact a 1" BSP Quick Disconnect flat faced fitting. more cleaning and a few more grunts and eventually it was off - the hose was mine !

A bit of a daft place to fit a QD fitting - should have been plumbed to a place that was more easily accessed.

A quick washing of hands and I'm just in time for the big ceremony with Zadok the Priest being played at high volume on the telly - phew marital harmony preserved AND the hose is off :lol:

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