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5.
Disassembly and service
5.1 Precautions for Disassembly
5.1.1. Disassembly
1.
Be familiar with the machine's structure and working principles before disassembly, it is the prerequisite
of correct disassembly.
2.
Try best not to detach the parts that can avoid being detached. Aimless detaching not only increases
work load of the repair, but also deteriorates the originally good fitting relation between parts and fitting
accuracy, which leaves new hazards of failure.
3.
Use suitable removing tools and correct removing methods. Never knock with a big force during removing
to avoid parts' deformation and damage. In order to improve repairing efficiency, the special removing
tools should be preferred tools.
4.
Disassembly work should be carried out step by step from the outside to the inside. Generally disassembly
is carried in the order of "Whole machine Assemblies Subassemblies Parts".
5.
In order to ensure smooth assembly after repairing, the following requirements should be met during
disassembly:
1) Check the marks, and make marks, (such as lines, arrows, and texts marked on some parts). If any part
has no mark, make a mark on its non-working surface to help reinstall it correctly.
2) Reasonably put parts based on their categorization. Parts of the same assembly or subassembly should
be placed together. Parts liable to deformation or missing, such as the washers, should be place
separately.
5.1.2. Reassembly
1. The place for assembly should be clean.
2. Prepare suitable assembling tools and devices.
3. Parts must be cleaned thoroughly; dust, dirt, earth, metal filings, carbon deposit, oil sludge and other
impurities must be removed from its surface, holes, grooves, oil passage, etc. Compressed, detergent,
etc. can be used for cleaning.
4. Carry out assembly in the order contrary to that for disassembly, i.e. in the order of "from inside to
outside, from major parts to auxiliary parts" and "parts subassemblies assemblies whole machine".
5. Take care to check the part mark and assembling mark of each part when assembling to avoid missing
or wrong installation.
6. When installing fasteners, tighten them in the order of "from the center to sides" and by turning several
times in a crisscross pattern. Then use a torque wrench to fasten them to the specified torque values.
7. When assembling, all gaskets should be replaced in a timely manner.
8. Carry out trial run of the machine after the whole machine has been assembled and adjusted, and no
fault is found upon check.
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Workshop manual
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