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G25 H Shifter Jumping Out Of 1St Gear


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#1 Paul Harwood

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Posted May 18 2019 - 08:50 AM

Help!

My g25 H shifter is jumping out of 1st gear into 3rd. Does it on a couple of mods. Just started doing this. was fine during an earlier session.

Any ideas? Was 'stuttering' a bit while in 2nd gear the last few days ... and now this ...

Thanks.

PH

#2 Bob Simpson

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Posted May 18 2019 - 12:21 PM

Sounds like it might be a mechanical issue inside the shifter.

Possibly:
One of the pots is loose
A wire is loose or about to break
One of the pots needs to be cleaned (least likely)

Be careful if you open the case as there are several very thin wires, and putting it all back together, you have to make sure the wires are routed around the posts so that they aren't stressed.

Edited by Bob Simpson, May 18 2019 - 12:26 PM.


#3 Paul Harwood

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Posted May 18 2019 - 12:28 PM

Pretty sure a wire is loose in there. Fooling around from the top of the shifter by removing the boot, now it won't shift to 1st ,2nd 5th or 6th. It looks like i'll have to ope he unit completely to access all wires ... the shifter moves ok but only gears 3 and 4 light up.

#4 Paul Harwood

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Posted May 18 2019 - 12:32 PM

Thanks Bob.

Very few videos on YouTube that go that deep in dissassembly ...

I have no other choice ... I have to total dissassemble ...

Rats!

#5 Michkov

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Posted May 18 2019 - 03:23 PM

Sounds like the left right potentiometer has a loose or broken wire. While you have it in pieces best check the other pot for connection issues too.

#6 Cannylad

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Posted May 18 2019 - 03:53 PM

This is a handy guide on disassembling the G27 shifter, but I believe the G25 is almost identical:
https://www.ifixit.c...placement/42378

#7 gplracer222

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Posted May 19 2019 - 02:14 AM

That might very well be a potentiometer problem.
I'm not too much of an expert but I'd disassemble it, clean the potentiometers a little, make sure when re-attaching that they're in the correct spot, and the reassemble. Worked for me a couple of times already on my G27.

#8 Paul Harwood

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Posted May 19 2019 - 02:23 AM

Thx all! will check it all out.

PH

#9 Paul Harwood

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Posted May 19 2019 - 04:33 AM

I'm down to the final shifter cage removal. I can see the 2 pots and their connectors. All looks good connections-wise ... Onto the cage removal to have a look at a small pc board and connector on the bottom of the shifter body ...

So far, there are 14 pieces and 20 odd screws disassembled .... to get to the shifter body ...

Its all dust-free in the shifter housing. Only 'dirt' is the graphite lube ... Does that lube tend to foul up pots?

Thanks for the guide link. Also a decent video here.

https://www.youtube....h?v=eCyt_4luwF0

Diving back in ...

PH

#10 Paul Harwood

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Posted May 19 2019 - 06:35 AM

Found a tiny wire broken right at the connector on rear pot!

Yikes! That is tiny. How to disconnect the connector from the pot?

Is it possible to strip such tiny wire and re insert into connector?

PH

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#11 Cannylad

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Posted May 19 2019 - 10:41 AM

I had the same problem. The connector simply un-plugs from the pot.
In my case, the wire broke off right at the end of the pin, and there was a rubbery sealant around the end of the pins - so I couldn't get to the pin to re-solder. It's not clear from your photo whether you have the same issue.
To fix it, I managed to find a replacement pin for the pot socket among some old PC spares (a processor fan power connector pin type XH - I think. Search eBay for 'XH connector'.). However it's a tricky job cutting away the rubbery compound (using a sharp scalpel) to extract the old pin from the socket (a small tang holds it in). Once that's done it's straightforward re-soldering the wires to the new pin. I used some silicone sealant to reinstate the stress relief afforded by the original rubbery compound. Not pretty, but it has worked well!
Good luck!

#12 Paddy the Irishman

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Posted May 19 2019 - 11:57 AM

I don't know what the connector is like but think that if you can get it off,  solder the wire on to the connector, or get it soldered by someone else if you can not solder yourself.  Less liable to break again.

Edit:-  Cannylad got in as I was typing this. He has given you all the you need

Edited by Paddy the Irishman, May 19 2019 - 12:00 PM.


#13 Paul Harwood

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Posted May 19 2019 - 05:20 PM

Ah! That's why the top of the connector looks so messy! It does look like some kinda goop is all over it. Many thanks guys. I don't think I have ever worked on such a small scale even working on guitars and long ago on slot racing cars. I may need far more experienced electric tech help to get that wire reconnected.

I will study the old pin removal issue a bit more today and rummage through my tools to see if I have anything that can work on such a small scale.

Thank you Paddy and Cannylad for the info.

PH

#14 Paul Harwood

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Posted May 20 2019 - 06:20 AM

Repair status report:

connector removed ok.

old terminals pulled out ok. (Found a perfect old terminal removal video) https://www.youtube....h?v=S9xeg_3eREc

I did break off another wire. But I did note the positions earlier.

Now to re-solder wires to terminals and re-assemble connector.

A friend will drop by tomorrow with good modern small job soldering gear.

Stay tuned.

Will Tex Harwood make the ADC VOR 67 SC mod starting grid on Wed night at Opatija?

Cheers.

PH

Edited by Paul Harwood, May 20 2019 - 06:30 AM.


#15 Daniel0099

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Posted May 20 2019 - 09:13 AM

If you cannot fix your problem, I have a defective G27 shifter that I can ship to you, to reuse some parts to fix yours maybe. I think both G25 and G27 are very similar.

#16 Old Simmer

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Posted May 21 2019 - 02:44 PM

Worn synchronizer.

:)

Old Simmer

#17 Paul Harwood

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Posted May 21 2019 - 09:57 PM

Wish it were the syncro ...

Repair status: Too small-scale a wiring job for my friend. I will reach out to pro electro repair guys in the area and start also looking into getting the tools and parts required to do the repair myself, as this may be less expensive. Finding these is easy once I know what the name of the components are to Google for the right thing. (ex. Dunlop connectors)

Thanks for the offer Daniel! In fact, I could cannibalize my old MOMO pedals for their pot connector but that seems wasteful, but yes, donor shifter or pedals would be one way to fix my shifter,

I will probably make the racing this week but not with an H pattern shifter, which in the case of the Opatija hairpin breaking zones, is a crying shame!

Logitech have replied to my help request with the referral to their tech support but also with a referral to some kind of sponsorship application. I will check that out as well.

In large part, this is a 'planned obsolescence' issue and parts and wiring that are of the most delicate type, probably mass produced and assembled but also these days it is an ecological and green-thinking issue. Many solutions would make landfill of such computer peripherals at the 1st breakdown but that seems immoral at worst. So, getting max longevity out of such equipment is not a bad thing.

On the other hand, the mechanical side of the Logitech G25 shifter design and its other electronic components is pretty cool and designed for pretty tough use at an arguably affordable price.

Stay tuned.

PH

Edited by Paul Harwood, May 21 2019 - 10:02 PM.





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