They are very easy to fill up with an oil-can with a flexible stalk,
Cheers Charlie
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If your steering feels loose and perhaps the vehicle wanders a bit with a constant need for correction, you might look at the swivel balls/Railko bushes.
The resistance to rotation on these, using a spring balance is quoted at 12-14 lbs. The procedure is in the book under Operation F1-10.
I'd also check the steering box is tightly secured - but you'll find out more if you do as suggested, ie jack up the vehicle, turn the steering wheel and look for unusual movement or the lack of it.
Jack
What is the best method for testing the swivel balls ?
If you're talking about adjusting the swivel resistance, this scan from the Repair Operation manual, may help you -
https://www.aulro.com/afvb/images/im...013/01/102.jpg
Jack