It's been a while since I've had an older style 499 pump apart, but if I recall correctly, there is a planetary gearset inside that small gearbox. Grease would too easily push out of the pins that the planet gears spin on. Best to put in a seal now before any more damage occurs, because parts for those older style pumps are expensive and sometimes hard to find.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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