What points should be paid attention to when installing the pin gear shell of the BLY13-35-4 cycloidal reducer and tightening it evenly?

When installing the BLY13-35-4 cycloidal reducer needle gear housing, it is necessary to ensure accurate positioning and even tightening to avoid radial movement and end cover deformation. The core is to tighten the bolts diagonally in stages and control the torque.

During the installation of the pin gear housing, uniform tightening directly affects the meshing accuracy and operating stability of the reducer. If the bolts are tightened unevenly, it will easily lead to eccentricity of the pin tooth shell or distortion of the end cover, which will lead to poor meshing between the cycloidal wheel and the pin teeth, local overload and even broken teeth. The specific fastening points are as follows:

1‌. The positioning stop must fit tightly.
When installing the pin tooth shell into the box, make sure it fully fits the positioning stop of the box, and the gap shall not exceed ‌0.01mm‌. If there is slight looseness, a 0.005–0.01mm thick copper sheet can be inserted into the seam for fine adjustment to prevent radial movement of the pin tooth shell after assembly.

‌2. Tighten the end cover bolts diagonally in stages.
When installing the end cover, the bolts must be tightened diagonally in stages. The applied torque increases by about ‌30% each time, and finally reaches the standard torque specified in the manual (such as ‌35–40N·m‌ for M12 bolts) to avoid deformation caused by uneven stress on the end cover, which indirectly causes the input shaft eccentric sleeve to tilt.

3‌. Joint surface sealing treatment‌
Apply an appropriate amount of sealant (such as Loctite 510) on the joint surface of the end cover and the box body to prevent oil leakage, while also helping to buffer vibration and improve the overall structural stability.

‌4. Maintain cleanliness and precision throughout the entire process.
Before assembly, all parts must be cleaned with absolute ethanol or aviation kerosene to remove iron filings, oil stains and other impurities. Ensure that there are no residues on the pin tooth pin, pin tooth sleeve and cycloidal gear tooth groove to avoid assembly deviations caused by interference from tiny foreign matter.