Prometheus Posted May 24, 2019 Share Posted May 24, 2019 Help!!! i have just purchased an old but unused Portescap RG 4. The motor is fine and runs quietly: the gearbox has almost seized however and requires quite a lot of torque (via a hand-turned wheeled axle) to rotate the gears. The motor alone will not do this. I have lightly oiled the gearbox (which seemed to have no lubrication if any sort whatsoever) but to little avail. is this problem known? What can I do to ease the ‘box sufficiently for the motor to drive it without strain? many thanks Tony Link to post Share on other sites More sharing options...
Tony Cane Posted May 24, 2019 Share Posted May 24, 2019 Hi I found that on a motor that had been stored unused for some time that the original lubrication had gone solid. Once cleaned with white spirits and a small stiff brush, the re lubricated the motor worked fine. Regards Tony (Is there an echo in here?) Link to post Share on other sites More sharing options...
Prometheus Posted May 24, 2019 Author Share Posted May 24, 2019 I’ll remove the gearbox from the motor again Tony and soak it in IPA for a while. A wire brush may not be good for the initial nylon drive, but the steel gears should tolerate it. thanks Tony Link to post Share on other sites More sharing options...
Prometheus Posted May 24, 2019 Author Share Posted May 24, 2019 Expert analysis there Tony, thanks. An hour in some IPA and it turns nicely. The IPA is now the colour of that other IPA though! Tony 2 Link to post Share on other sites More sharing options...
decauville1126 Posted May 24, 2019 Share Posted May 24, 2019 This is a regular issue with new-old-stock Portescaps. I too always remove the gearbox and leave in IPA for a couple of hours with a periodic spin of the gears, then allow to drain then relubricate with TriFlow (available from bicycle shops or online) which is a plastics-compatible oil with ptfe. 1 Link to post Share on other sites More sharing options...
Prometheus Posted May 24, 2019 Author Share Posted May 24, 2019 Triflow? Thank you, I will try to get some. Tony Link to post Share on other sites More sharing options...
RMweb Premium Michael Edge Posted May 25, 2019 RMweb Premium Share Posted May 25, 2019 GT85 works very well for this. Link to post Share on other sites More sharing options...
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