See the semi-trailer
accessories protection surface layer is in good condition.
Most of the parts in the factory are coated with the protective layer.
Such as piston pin, bearing bush with paraffin wax protection;
Piston ring and cylinder liner surface rust-proof oil and paper package;
Valve, piston, etc after immersion rust-proof oil encapsulated with plastic bag.
When the choose and buy, if find seal set of loss of damage, loss of wrapping paper, rust-proof oil or paraffin, shall be returned.
See parts surface of rustily.
Qualified surface of semi-trailer accessories, there are both certain accuracy and polished finish, the more important semi-trailer accessories, precision is higher, more rigorous rustproof packaging.
When the choose and buy should pay attention to check, if found parts with rust spots, mildew spots or rubber parts cracked, loss of elasticity, or shaft neck surface has obvious pattern of the lathe tool, should be change.
See if combining site is flat and level.
Semi-trailer accessories in the process of handling, storage, due to vibration, knock against, often in combination with the parts have burrs, indentation, breakage or crack, affect the use of the parts.
When the choose and buy should pay attention to check.
See the geometry deformation.
Some parts because of improper manufacture, transport, storage, easy to deformation.
Check, axial parts along the glass plate rolling can be a circle, parts and glass laminating to judge whether any light-leaking bending;
The clutch platen steel or friction slices of choose and buy, can lift, friction plate of the steel is in the eyes to observe the warping;
When the choose and buy oil seal, skeleton oil seal face should be positively circular, with flat glass joint without deflection;
Frameless oil seal edge should be regular, with hand make its deformation, should be able to recover after let go.
Should also pay attention to when the choose and buy all kinds of pad, check the geometry size and shape.
Over the years, has become very popular as more and more people are trying it out.
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