The Craftmans Shop > New from Old
It's BIG, Yellow and digs holes! JCB 3CX Project 8 is joining the Tractor Shed
David Jupp:
Now it has been mentioned the hole (without the expected jiggle pin) does look large. Without jiggle pin it will always pass water too - jiggle pin usually shuts flow off when engine is running.
Roger B:
I could suggest that it was stuck open until you started disturbing the housing and then it dropped shut. As it didn't open under subsequent heating it was obviously faulty. Can you push it open by hand?
awemawson:
Nope - I couldn't shift it at all by hand.
binned it !
ddmckee54:
Andrew:
I was talking about the hole in the thermostat visible at about the 7 o'clock position in the photo Offending Thermostat #2. I believe that the hole is there to limit the pressure on the coolant pump seals when the thermostat is closed. That one seems a little excessive.
Don
awemawson:
For a long time I've been puzzled by an hydraulic leak from the back end - puzzled in being unable to locate it that is !
There are 6 hoses formed into a 'trombone shape' conveying fluid to the various services on the back actor - (they move side to side as the boom is side shifted) - they'd got pretty grubby with mud so I cleaned them down the other day. Five minutes later oil was dribbling down the hose nearest the front of the machine. Was this my mystery leak? Only a small dribble and no sign of damage to the hose. A few more cleaning & trying cycles and yes certainly something was leaking. Both ends were tight (1/2" BSP female) but bally difficult to access.
So I ordered up a hose, and also a 27 mm 'crows foot spanner' the more easily to undo the ends. A bit of time today so I started. The whole rear arm needs to be lain on the floor just so things don't descend suddenly when opening hydraulic joints, so a bit of tractor shifting first then lay the boom down.
Old hose eventually was cajoled off and I realised then that the 'energy chain' that these hoses run in was packed with oil laiden mud so would have to come off for cleaning. Now oddly there was no sign of any damage on the hose that I removed.
With the boom down on the floor it was obvious that one of the 'crowd' cylinder hoses had come to the end of it's life - worn down to the inner of the two braid layers. Again 1/2" BSP - straight one end and 90 degrees on the other but I hadn't ordered a spare :bang:
Fortunately I had suitable ends and hose so I crimped up a custom part. Everything fitted back together without too many dramas and what's more there is no leak!
I tested it without the 'energy chain' so that I could feel all round the hose - glad to say all's well and I refitted the newly cleaned energy hose.
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