As part of my DT55 fitting I have discovered that the PTT seems to only work sometimes when I hit it. Any ideas, presumably brushes? Are these easy to change?
Hi Tomkat
It all depends how good you are with a screwdriver, how much patience you have and a gentle touch won't go amiss, hardest part will be getting the armature back in between the new brushes, it might only need a clean with some contact or brake cleaner.
I would open it up whist it's still serviceable. I'd not want to be hitting it for too long you will do more damage. At the moment it sounds a cheap (albeit time consuming) fix.
I can't remmeber what flavour of motor / hydraulics you have in that engine, but when I did mine it was about a million times easier & quiocker to rebuild the entire motor on the workbench. If it;s one of the single ram type you will likely get away with dropping the two bg pins & removing the whole lot, which will obviously save you the hassle of draining it down.
At that age it's probably one of the three ram integral to the bottom of the engine jobs? In that case you might be able to remove the motor as a whole using a long socket extension, but I don't know the clearances in there.
Took it for its first run last week, did not work until I gave it a hard whack with a hammer and been 100% since! I would like to hope that will fix it but unlikley!
Sounds like the brushes are worn, or the springs are corroded. Hitting it with a hammer is a temporary fix which is obviously 'making a contact' with the armature. Strip it out and take a look. You'll need new rubber 'o' rings, brushes, etc. Had a similar problem myself - see link. http://www.rib.net/forum/f36/twatsoo...-up-38278.html
Took the bull by the horns and stripped it down. the brushes were OK but sticky in their guide blocks, cleaned them and bent them out a bit to make them a looser fit and rebuilt and working 100% now!
Not the handiest thing to put together and strip but got it back together on the second attempt!
Sula
