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D125 transmission oil

Technical help for all early models, A, B, C, LC, D, LD, E & F models

D125 transmission oil

Postby Willamb » Sat Oct 13, 2018 1:26 pm

Hi, I need some help with the transmission oil in my 1952 d125. I cannot see any way of draining the oil or refilling it. I recently removed the circular plate towards the back of the transmission case and oil came out. Is there a filler above this which I cannot see or was the oil overfilled at the time the engine was put together?
The only other access to this area that I can see is the square plate at the end of the transmission case. Am I missing something?
Help please!
Thanks in advance.
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Re: D125 transmission oil

Postby jbcollier » Sat Oct 13, 2018 2:37 pm

The link below shows you where to drain, fill and check the gearbox level on a 150D. I think the 125D is similar. The level plug is "F" which is right above "Fig. 10". It's under the engine but it is a passage that opens up inside the engine at the correct level. Fill until it starts running out.

https://jbcollier.smugmug.com/Scooter/i-nFBkCxh/A
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Re: D125 transmission oil

Postby Willamb » Sun Oct 14, 2018 12:47 pm

Thanks for the info JB. I assume therefore that the gearbox and transmission oil are one and the same.
Cheers
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Re: D125 transmission oil

Postby jbcollier » Sun Oct 14, 2018 1:50 pm

Yes, transmission and gearbox are the same thing. The final drive uses different oil though, 250 weight gear oil is specified.
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Re: D125 transmission oil

Postby Steve J » Wed Oct 17, 2018 10:50 am

jbcollier wrote:Yes, transmission and gearbox are the same thing. The final drive uses different oil though, 250 weight gear oil is specified.

Not sure what is meant by 250 weight gear oil - in the UK, the final drive oil is specified as SAE 140 EP.
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Re: D125 transmission oil

Postby jbcollier » Wed Oct 17, 2018 12:50 pm

Sorry, going off memory again, always a bad idea at my age. 140 is correct.
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Re: D125 transmission oil

Postby Steve J » Thu Oct 18, 2018 11:01 am

jbcollier wrote:Sorry, going off memory again, always a bad idea at my age. 140 is correct.


No problem, I just wondered if the earlier 125 models used anything different. I know the C/LC models used grease in the final drive, which is a bit like treacle...

Memory? In my case, if it's not written down or photographed, it never happened! :?
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Re: D125 transmission oil

Postby jbcollier » Thu Oct 18, 2018 2:46 pm

It's called semi-fluid grease and is commonly used in industrial gearboxes and steering boxes. It's also a good option if you have a leaking issues.
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