In special terminals such as bulk material terminals, especially iron ore, long-term atmospheric fouling is likely to accumulate on the internal structure of the QRH hook, causing more frequent maintenance.
Grit guards are mounted on the hooks to prevent dirt build-up and reduce maintenance frequency without hindering normal operation.
The following photos help to understand.
![](https://gleneng.wpenginepowered.com/wp-content/uploads/2022/03/Grit-Guard-02.jpg)
![](https://gleneng.wpenginepowered.com/wp-content/uploads/2022/03/iron-ore-QUICK-RELEASE-HOOK-1024x768.jpg)
![](https://gleneng.wpenginepowered.com/wp-content/uploads/2022/03/BULK-MATEIRAL-TERMINAL.jpg)