How pulley shaft assembly and motor pulley is rotating because the level of what you need before you can put it stuck, do not let it fall. Pulley and shaft are connected by bond Bushes, but I do not think so simple, So what other parts needed to assemble it? general interference fit it is not going to fall, but if others want the pressure with the motor shaft head cover will not fall off. Generally do not use the pressure lid way, because the use of the pressure lid way after a long time easy to loose pulley key, cut key phenomenon. 1, a tight fit (most common) 2, shaft gland Threaded and 3, with the shaft with an elastic collar 4. Tapping on the pulley, the radial screwed 5. This is generally an interference fit You say the situation does not appear to fall, so the sleeve is no need, according to what you mean is the motor on the lower pulley is a common phenomenon of 6. If the traditional structure of the pulley, usually at the outer end of the shaft plus a lock nut, such as using European standard sleeve pulley on much more convenient Bushes advantage, nor the existence of such circumstances. Why pulley laser alignment system has a pair of pulley system Bushes standard, which is the application of the system for the laser to be divided, because the conventional measurement methods and tools can not meet the high temperature and pressure measurements and other harsh environments therefore have chosen laser alignment. Pulley system on the lightweight, portable and durable. Parts magnetically attached to the inner surface of any pulley or sprocket or outer surface, and no easily lost small parts or accessories. After installation, a laser line from the transmitter toward the reflector on the opposite pulley. Baseline reflector is immediately displayed on the dislocation and the vertical angle offset. Then the laser transmitter will automatically return to the baseline display horizontal angle offset. Laser pulley alignment system allows a single operator can learn to use in minutes, easy to use. Bushes processing, Hengda Machinery (certified), Xinjiang Bushes provided by Texas Hengda Machinery Limited. Texas Hengda Machinery Co., Ltd. (www.sddzhdjx.com) (www.sddzhdjx.com) is Dezhou, machining leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Hengda Machinery leadership in the staff warmly welcome all inquiries negotiations to create a better future Hengda machinery.