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1400 TOP 80 Gearbox Ratios.
If you are ever in the unlikely need to repair or replace the gears in the reduction drive on your PAP 1400 TOP 80 paramotor, the first thing you need to establish is which model gearbox you have, whether you have the one designed to run on "Gloopy" grease, pre Feb' 2005, or the later one designed to run on oil.
The easiest way to tell the difference is by the type of gearbox breather and the case shape. The earlier model has a plain tube to act as a breather, whereas the later version has a breather device with a metallic cap on it and the case has a more rounder shape, see photos on right.
Prior to Feb 2005 the factory fitted a 3.6 / 1 (20/72 teeth) reduction to standard PAP 1400 Top80 machines with an option to run a 3.9 / 1 (actually 3.84 / 1, (19/73 teeth)) with a carbon prop; thereafter all 1400 Top80 machines have been fitted with the 3.9 /1 and the wood prop spec was changed to a 53cm pitch.
NOTE that the gears from the early box are not interchangeable with the later version, although if you have been running the 3.6 ratio on an early type g/box you could change to the 3.9 and change the prop, this gives improved throttling and thrust.
Re seals: the early reduction (running grease) does not have a seal before the bearing on the clutch side, it relies on the seal on the bearing stopping the grease leaking onto the clutch. It does have one on the output shaft. The later gear box has a seal on the clutch side small gear shaft, this is quite difficult to replace and the factory advises that if it wasn't leaking to leave it in and only replace it if it is obviously damaged. As with the early version gearbox there is a seal on the output shaft.
Please note that if you remove bearings and or seals that they should be reassembled using "Bearing fit" liquid. Also use "bearing fit" on the splines of the propeller carrier or wear will occur on the spline causing the propeller to have play in the tracking, which will lead to excess vibration.
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