Help with oil leak on Warco GH1236 lathe

[papflynnParticipant @papflynn]

[papflynnParticipant @papflynn]

I have an oil leak on my lathe and I 'believe' it is coming from the shaft shown in the image. As can be seen I applied some paper strips to the area and the upper strip is dry whereas the lower one has oil on it. I can move the shaft slightly by pushing on it radially.

Any thoughts as to how I can fix this?

Paul

PS: Image to follow when I figure out how to upload.

[papflynnParticipant @papflynn]

[Chris Evans 6Participant @chrisevans6]

Most (all?) machine tools leak a little bit so do not worry. If the leak bothers you turn a simple plastic "Cup" and after a degrease stick it over the end of the shaft with silicone.

[MonomanParticipant @monoman]

I don't think that is the end of a shaft. I have a Warco GH 1322 which has a very similar gear box.

I would expect that to be the fill plug for the gearbox, if you look carefully you can see the allen key recess. The plug is a BSP taper and might need tightening. I did a full overhaul of my machine this summer and had a careful look at all the parts.

Jerry

[papflynnParticipant @papflynn]

Hi Chris,

that is a good idea. Will do that.

Jerry,

is the large black allen key plug at the 4 o'clock position to the large gear not the fill plug?

Rgds

Paul

[not done it yetParticipant @notdoneityet]

is the large black allen key plug at the 4 o'clock position to the large gear not the fill plug?

One should be able to tell if this is a turning shaft, when running. If it is, and there is no proper seal (or cap and drain, back to the casing), that is one really fine design! Not!

[BazyleParticipant @bazyle]

The gear selector knobs on the front have a pinion inside which engages with a rack on a slider which in turn holds the gear selector fork. The slider runs along a rod. The item indicated is the end of the lower rod. It is sealed by an o-ring at each end and held by an M5 grub screw at the right hand end under the front plate of the gearbox.

So unless you are taking the gearbox apart it isn't possible to renew the o-ring. The shaft is fixed non rotating so just seal it over.

edit – the lower black bush with the obvious hex socket is the drain and the upper the fill. Despite appearance the lower one is probably level with the bottom of the sump and has a void below partly for the on/off switch at the RHS end.

Edited By Bazyle on 26/11/2017 16:34:03

[MonomanParticipant @monoman]

Here are some photos of my GH1322 side view, gearbox cover and gear change selectos.

[MonomanParticipant @monoman]

Last post is side view of gear selectors, gearbox, partly disassembled and external end view.

If you should think of removing the gearbox cover then consider carefully. 1 there are locating pins hidden beneathe the paint and 2 the selectors need patience to reassemble correctly.

NOTE My machine is a GH1322.

Jerry

[papflynnParticipant @papflynn]

As Bazyle pointed out, the shaft does not rotate. I don't feel like overhauling the gearbox so I think I will seal over the shaft. Thanks all for your replies.

Paul

[Martin WhittleParticipant @martinwhittle67411]

Good choice Paul:

'If it ain't broke, don't fix it'

If it works well, there is plenty of oil, and it is not not too old and worn, and there is not an obvious problem, it probably ain't broke.

So don't fix it! – unless you feel an educational need tofind out how it works.

Martin

Edited By Martin Whittle on 26/11/2017 20:46:20

[BazyleParticipant @bazyle]

Paul, there are several different designs of gearbox on far eastern lathes getting code names and numbers and many just a size designation while the design has changed over 30 years. Yours is more like a G0750G and is different inside from the one pictured above. If one day you do take it apart take some pictures to help people in the future.

It also helps when asking a question to provide more pictures and more details including age of the machine.

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