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Old 26 October 2011, 16:59   #1
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PTT - works when I hit it?

Hi

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?

Cheers for any advice.
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Old 26 October 2011, 17:28   #2
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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.
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Old 26 October 2011, 17:29   #3
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OK, maybe it will sort itself out with some use? Its an engine that I presume has been laying up for quite a while.
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Old 26 October 2011, 19:00   #4
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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.

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Old 27 October 2011, 03:26   #5
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Thanks Peter

Prob good advice, gonna trail run it this weekend then can investigate over the winter. There may well be other more pressing repairs!
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Old 27 October 2011, 04:26   #6
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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.
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Old 05 November 2011, 17:29   #7
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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!
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Old 06 November 2011, 12:58   #8
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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.
Twatsoo 60hp won't fire up
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Old 06 November 2011, 15:06   #9
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Aye definately needs stripped, might just be dirty though as works some of the time, took out today and had to 'encourage' it to work!
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Old 13 November 2011, 11:56   #10
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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!
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