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The ZD30 has an 'automatic' belt tensioner with a little shock absorber. It sits next to the water pump from memory.
If you have belt squeal it could be caused by the belt (worn, or stretched, or contaminated with coolant or similar), the tensioner shocker, a worn pulley bearing (or poorly aligned) or the insulators that the shocker are mounted on...
Normally with this style of belt its worth roughing up the belt with a wire brush and maybe some drilube after that. If that doesn't work it'll need to be removed and check all other items.
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