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Re: Why is a Zetor heavier than most tractors of same HP.
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Posted by ltf in nc on December 27, 1999 at 19:10:04 from (206.228.214.219):
In Reply to: Why is a Zetor heavier than most tractors of same HP. posted by Malachi on December 27, 1999 at 14:33:43:
My own experience with castings that are outsourced in developing countries are as follows. The facilities and techniques are not much different than what existed in this country in the late 30's and 40's. However a major difference today is the source of the casting material. The source now being used is recycled cast of dubious origin. Engine blocks are segregated from the other items and this source of good material is recycled into new blocks. The balance of the scrap heap, (steam radiators, water pump housings, junk air compressors, rejected new castings, window weights, etc.) is destined for the cast housing components. This results in having to have overkill in the wall thicknesses of the components to overcome the weak spots resulting from such raw material. Herein lies the answer as to where the additional weight comes from. Frequently, when machining these parts the shops have tool breakage due to hardened material(stray ball from a bearing being left in a water passage of the block) getting into the scrap and the castings are also plagued with voids from slag. Most of these castings will be coated on the inside to minimize weeping or leaking through the castings. Knowing the above it is much easier to understand why many of these tractors stay wet with oil and what causes the unexplainable breaking in half or front ends collapsing. I have been to these places and seen this myself. This is not second hand information. I do not want one of these tractors.
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