How to Repair Chi-Chi Wall Fan Noise | Fan Bearings 608ZZ Replacement Step by Step DIY

Tutorial on how to Repair KDK wall fan noise by replace the bearings of 608ZZ

1. What is the difference between 608ZZ & 608Z?
ZZ means 2 metal shields installed on 1 bearing [2 shields ×
1 bearing = 2 shields].
Z means 1 metal shield installed on 2 sides of the bearing [1 shield × 2 sides = 2 shields].
So, both 608ZZ & 608Z actually have the same number of metal shields, which is 2 [double metal shielded].
2. Which one to choose?
~8.1mm hole size for wheels like skateboards, inline roller skates, scooters, wheelchairs, etc.
~8.0mm hole size for motors like electric tools, fan, shafts, gearboxes, etc.

SPECIFICATIONS:
Name: 608ZZ / 608Z Double Metal Shielded Ball Bearing
Bearing Type: Single-Row Deep Groove Radial Ball Bearing
Seal Type: Double Metal Shielded
Material: Chrome Steel
Inner Diameter: 8.0mm / 8.1mm
Outer Diameter: 22mm
Width: 7mm
FEATURES:
* Strong & durable
* Long service life
* High rotational speeds
* High precision
* Double metal shielded
* Pre-lubricated with grease
* Silent & smooth operation
* Low-maintenance

DESCRIPTION:
608ZZ & 608Z bearings are both suitable for high rotational speeds & heavy load applications.
~8.1mm hole size (looser fit) is commonly used for skateboards, inline roller skates, scooters, etc.
~8.0mm hole size (tighter fit) is widely used for industrial machinery, electric tools, motor shafts, etc.
They can also be used to upgrade/modify/repair 3D printers & make accessories like spool holders, filament guides, lead screw stabilizers, etc.
The double-sided metal shields act as armor to protect the inside from dirt & damage and also help to keep the lubricant inside.

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