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JCB 803 Saga

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awemawson:
Abraham thanks for that. Sadly those red bits are passages within the casting

I have a possible postulated theory :ddb:

IF the chap who replaced the Orbitor for me inadvertantly swapped the pressure and the drain hoses under the floor all would be explained. They are identical. Absolute pain now to get at the Orbitor end but no reason I cannot swap them at the spool block end. I just need to assure myself that if my theory is wrong I won't damage something.

JD:
Andrew, if all else fails could you swap the spool valves side for side to see if you get the same problem. I have been following this thread with great interest.
You don't half pick em  :nrocks:
John

awemawson:
I could John but it would be a 'right pain'

The more I think about it I reckon that the fitter who replaced the Orbiter has cocked up a pair of hoses on the left hand side. Until I REALLY studied the plumbing I had assumed that the pilot servo feed that feeds both left and right dual speed spool valves were paralleled by a Tee fitting in the under carriage. In fact the Orbiter  has an output on left and right hand sides for both the pilot feed and the 'drain return' which logically do the Tee function without a Tee !

Can't really blame the chap as it's an absolute pig to get at (which is why I didn't do it myself), and he had it in and out several times as originally it came out to have seals replaced, then they found that the seals were wrong, then they found the right seals still leaked, then I found then a second hand one that worked !

I'm going to try swapping the pipe at the spool valve tomorrow unless it's pouring down

The hoses in question are marked '2' in the following pictures, there are a pair for each side, and as you can see at the orbiter where they start with a 90 degree fitting it would be dead easy to mix them up. In the diagram '1' is the rotary orbiter and '3' the flow and return to the track motors.

awemawson:
Up with the lark, mucked out the pigs, and it still wasn't raining (quite a change from recently) so with no delay I got 'out and under'

Whipped the cover plate off, undid all four pipes (as the servo ones are to the rear of the main drive one), swapped over the servo pipes, replaced the main drive ones all with a minimal oil loss, as this time I knew that a Sharpie pen with a rubber glove over it neatly plugged the pipes  :ddb:

Cleared the deck of tools and drip trays, up into the cab, lifted her up onto the dozer blade and dipper arm so that the track were off the ground, and gave it a try ....

IT WORKS
WE HAVE TWO SPEED TRACKING
 :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb: :ddb:


Rather a relief actually, as if it hadn't been that the chap had inadvertantly reversed the hoses at the Orbiter, then I really would have been stumped for the next move

DMIOM:
Logic triumphs    :clap:  :clap:  :clap:  :clap:  :clap:  :clap:

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