How to remove the dead nuts and screws

The lack of pressure on the agricultural machinery* will speed up the cause of insufficient engine oil pressure and the wear and tear of the countermeasures, affecting the normal operation of the engine and causing economic losses. 'The main reasons for the insufficient engine oil pressure are: oil leakage is serious, the filter is blocked by debris, the oil pump is worn out too much, the oil circuit is not smooth, the oil hole of the main shaft is misaligned, the oil is too thin, and the bearing bush is too large.

If the oil leaks seriously, tighten the loose screws, replace the damaged oil seal and gasket, and repair or replace the cracked oil pipe. If the filter screen is blocked by debris, the filter should be removed for cleaning, and the new oil should be replaced after reassembly. If the oil pump wears too much and the oil pump supply is reduced, the oil pump assembly should be replaced. If the oil pipe is bumped and the oil path is not smooth, replace the flat oil pipe to clean the blocked oil circuit. If the oil hole of the main shaft is misaligned, the oil supply hole between the main bearing cover and the main body, the main bearing cover and the main bearing should be reinstalled so that it is no longer misaligned. If the oil is too thin, use the appropriate oil according to the requirements of the instruction manual. If diesel oil and water are leaked into the oil pan, the diluted oil should be drained to remove the leaking fault and then replaced with new oil. If the clearance between the crankshaft and the bearing bush is too large, the bearing bush should be repaired so that the clearance between the crankshaft and the bearing bush meets the requirements specified in the instruction manual.

Chen Maochun, Danjiangkou City, Hubei Province (442701) How to disassemble the dead nuts and screws on the threads: I have infiltrated the provincial agricultural machinery identification station, Keping, in the mechanical repair work, often encountered the removal of nuts or screws If you don’t come down, it’s very nerve-racking.

The main reason for this phenomenon is that due to the frequent loosening of the thread during use, some users have fixed the riveting, welding, etc.: or due to collision or improper disassembly, the thread head is rough or the thread is buckled; Perhaps because the wrench is not suitable, the opening is too wide, and the nut is rounded. In these cases, only the application of mechanical processing methods, such as chiseling and boring, eliminates the phenomenon of fixing, upsetting, and smashing; the edge of the nut is twisted and then screwed with a wrench to disassemble.

Further, in addition to the above, there is also a phenomenon in which adsorption or the meshing phenomenon occurs under the action of long-term pressure due to the screw connection, or the two are bonded together due to oxidative rust, so that they are not fixed. This can be done by the following method. The second is to use a suitable disassembly tool. If you use the movable wrench as little as possible, use a suitable fixed wrench or socket wrench to unscrew it, and you cannot add the relay rod at will.

The third is repeated and tight. Suddenly screwed into the 1/4 turn' and then quit, repeated tightly. In this way, the flattening and the shearing can be performed simultaneously, and the rust layer can be subjected to repeated pulling and compressive stress to separate the rust layer from the base metal, which is easy to disassemble.

The fourth is to slam the circumference of the nut by hand, so that the threaded joint is shaken to separate, and then thrown out.

The fifth is to use the blowtorch to dissipate the mother, the tired mother is heated and expanded, and the nail is heated. "Less, the expansion, the gap, the gap is formed, and then quickly loose."

When using the above method, pay attention to the positive and negative direction of the thread. Otherwise, if it is reversed, it will tighten more tightly, so that the screw will be broken.

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Hunan Agriculture 2002.12 first half of the month

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