A complete, whether trademark signs.
The handwriting on the authentic product packaging are of good quality and package is clear, bright colours.
On the packing box, bag, shall be marked with product name, specifications, quantity, a registered trademark, name address and telephone number, etc. , some manufacturer also hit their mark on the parts.
Some important components such as generator, distributor, fuel injection pump, etc. , also equipped with instruction manual, certificate of approval and chapter inspectors, to guide the user the correct use of maintenance.
When the choose and buy, should carefully identify, in case to buy fake and inferior products.
Second, the geometry size without 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 plate joint have to judge whether light-leaking bending;
Clutch platen steel or friction slices of choose and buy, can lift, friction plate of the steel in the eyes to observe whether the buckling;
When the choose and buy oil seal, with 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.
Third, to see if combining site is flat and level.
Spare parts 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.
Four, watch parts surface of rustily.
Qualified spare parts surface, there are both certain accuracy and polished finish, the more important parts, 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.
Five, the protective layer are 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.
Six, the glue joint parts with and without loose.
By two or more than two parts, accessories parts by pressure equipment, plastic or welding between, between them are not allowed to have loose phenomenon, such as oil pump plunger and adjust arm through a combination of installation;
Clutch driven pulley and steel sheet is riveting, friction plate and sheet steel is riveting or glue;
Paper filter filter skeleton and the filter paper is glue joint;
The thrum of the electrical equipment is welded together.
If found to have loose when the choose and buy, should be change.
Seven, see if moving parts are flexible.
The choose and buy the rotating components assembly such as oil pump, turn the pump shaft by hand, should feel flexible without binding;
Support of choose and buy when the rolling bearing and the bearing inner ring, outer ring, and with another hand outer ring should be able to quickly turn, then gradually shut down.
If the moving parts are in irons, internal corrosion or deformation, don't buy.
Eight, the assembly parts are complete.
Complete formal assembly parts must be in good condition, to ensure the normal operation of assembly and smoothly.
If some individual small parts on the assembly parts packing, will make the assembly parts will not work even scrapped