GB/T 17910（ISO 5057） 检查指南
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4、 检查周期
使用中的货叉应以不超过12个月的时间间隔或在一旦发现其有缺陷或变形时，按照如下第5章的要求进行检查。恶劣工况条件下使用的货叉，需要更频繁地进行检查。
5、 检查
5.1 应由经过培训的人员对货叉进行认真检查，以查明其是否有影响安全使用的损坏、失效和变形等。如货叉出现上述任何一种缺陷，则须停止使用。经过修复后并按照6.2的要求进行试验，符合要求后，才能投入使用。
5.2 表面裂纹
货叉应进行目测检查，必要时，应采用无损探伤法，以检查其有无裂纹。应特别注意货叉根部、上钩、下钩（包括其与垂直段的连接处），如发现货叉表面有裂纹，须停止使用。
5.3 叉尖高低差
当一组货叉安装在叉架上时，应检查两叉尖之间的高度差。如果叉尖高度差超过水平段长度的3%或叉车制造厂推荐的值，则该组货叉须停止使用。
该组货叉在进行必要的调整（见6.1）并按照6.2进行试验之前，不得投入使用。
5.4 定位锁
应保证定位锁在原位处于良好的维护和正常的工作状态。如发现任何故障，货叉在进行良好的修复之前须停止使用。
5.5 标记的清晰度
货叉标记应符合GB/T 5182的规定，如标记不清晰，货叉须停止使用。
5.6 货叉的磨损
5.6.1 货叉的水平段和垂直段
应检查货叉水平段和垂直段的磨损程度，尤其是货叉根部。
如果货叉水平段和垂直段的厚度减少到货叉设计厚度的90%，或由货叉制造厂规定的较小厚度，则货叉须停止使用。
5.6.2 货叉的安装
应检查货叉的上挂钩承载面以及上下挂钩的定位面的磨损，挤压和其他局部变形。如果这些缺陷很明显，使货叉和货叉架之间的间隙变得很大，则货叉须停止使用。对于其他安装形式，也应进行类似的检查。
4. Inspection cycle
The forks in use should be inspected in accordance with the requirements of Chapter 5 below at intervals of no more than 12 months or once they are found to be defective or permanently deformed (please contact Cascade for special gauges). Fork forks used under severe working conditions need to be inspected more frequently.
5. Check
5.1 The forks should be carefully inspected by trained personnel to find out whether there are damages, failures, and deformations that affect safe use. If any of the above-mentioned defects occurs in the fork, it must be discontinued. After repairing and testing in accordance with the requirements of 6.2, it can be put into use only after meeting the requirements.
5.2 Surface cracks
The forks should be inspected visually, and if necessary, non-destructive testing methods should be used to check for cracks. Special attention should be paid to the fork root, upper hook, and lower hook (including its connection with the vertical section). If there is a crack on the surface of the fork, it must be stopped.
5.3 Fork tip height difference
When a set of forks are installed on the fork frame, the height difference between the two fork tips should be checked. If the fork tip height difference exceeds 3% of the length of the horizontal section or the value recommended by the forklift manufacturer, the group of forks must be stopped.
The forks of this group shall not be put into use before necessary adjustments (see 6.1) and tests in accordance with 6.2 are carried out.
5.4 Position lock
It should be ensured that the positioning lock is in good maintenance and normal working condition in the original position. If any malfunction is found, the fork must be stopped before a good repair.
5.5 Marking clarity
The fork mark should meet the requirements of GB/T 5182. If the mark is not clear, the fork must be stopped.
5.6 Wear of forks
5.6.1 Horizontal and vertical sections of forks
The level of wear of the horizontal and vertical sections of the forks should be checked, especially the roots of the forks.
If the thickness of the horizontal and vertical sections of the fork is reduced to 90% of the design thickness of the fork, or the minimum thickness specified by the fork manufacturer, the fork must be stopped.
5.6.2 Installation of forks
The load bearing surface of the upper hook of the fork and the positioning surface of the upper and lower hooks should be inspected for wear, squeeze and other local deformations. If these defects are obvious and the gap between the fork and the fork frame becomes too large, the fork must be stopped. For other installation forms, similar inspections should also be carried out.
