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Hitachi

Hitachi Automotive Systems Ltd.

These are common questions about TOKICO shock absorber

QWhat is the difference between Gas type and Oil type?
A

Oil type: Oil + Air : Normal performance
Gas type: Oil + Gas : Better performance
Gas type contains the nitrogen gas.

QWhy do we feel comfortable in driving even if shock absorbers aren't gas type?
A

Gas type : It's better than Oil type. You can feel good even if you drive in bad roads.
Non Gas type (Oil type) : You can feel good when you drive well in paved roads.

QWhat is the content of the gas?
A

It is contained nitrogen gas.

QWhich do makers recommend, Gas type or Oil type?
A

They recommend the Gas type when you drive on the bad road because of their good performance. An Oil type can work enough on the paved road, but a road condition changes and it has the limit of its ability, so they recommend the Gas type.

QWhat is cavitation?
A

Cavitation means the phenomenon that bubbles appear and disappear in the oil during working the shock absorber. Cavitation makes the performance low, but gas type holds it.

QWhat is the caution of installing a shock absorber?
A

Followings are the main cautions. 1.Do not hurt a rod. 2.Tighten bolts and nuts properly.

QHow would the shock absorber be affected if a processed spring is attached?
A

Do not falsify the spring, otherwise there is a bad influence in the shock absorbers.

QIs it all right for the quality of TOKICO shock absorbers made in countries except for Japan?
A

As for TOKICO, their quality is OK, because the level of managing quality is same in the factories all over the world.

QWhat is the difference between TOKICO products and imitations?
A

The quality of an oil seal is different. Imitations' one is low quality, but it looks same as TOKICO in the point of the surface.

QIn the desert area, defects are caused by sand. How does the sand come into the shock absorber?
A

Sand sticks between a rod and an oil seal, and then the shock absorber works, the sand comes into it.

QWhen do the car makers recommend to change the shock absorber?
A

We recommend that if you got nosedives and unpredictable shaking on your car, you should replace them. Also if you found some damage on the shock absorbers like dent and bending part and dripping oil, be sure to change them.

QWhat is the minimum degrees the shock absorber can bear?
A

As for TOKICO, when the shock absorbers are operated in -40 degrees, the movement is not smooth because the inner oil is sticky very much. However after you start driving, the oil temperature is getting high and getting usual, so you should drive slowly 300 meters to 500 meters at first.

QWhen we change the shock absorber, should we change a spring too?
A

If the spring is worn out or its shape is changed, you should replace them in the same time.

QIs it OK to change the only one shock absorber?
A

We recommend to set the pair of shock absorbers because when oil leakage occurs in one side, the other is near to the same situation.

QWhat is the troubles of major shock absorber?
A

In the normal usage, the oil or gas leakage occurs. In the installing, the case that the oil or gas leakage in short term occurs because of harming the rod.

QWhat is the strong point of the TOKICO shock absorber?
A

TOKICO has high technical skill, which has replyed to the demand of car makers. On the basis of it, TOKICO has invented high-tech products such as semi-active shock absorbers, self-levelizers, air suspensions.

QIs there any problem to stock the shocks to lie down?
A

No, but it is better to stroke 4-5 times before replace new shock so that air and oil will become familiar.

QHow long has TOKICO be making shocks?
A

TOKICO has designed and manufactured shocks for over half a century. In fact, TOKICO is original developer of twin-tube low-pressure gas shock technology. We manufacture standard hydraulic, as well as mono-tube and twin-tube low -pressure gas shocks.