Daikin ZH5LMGU Инструкция по эксплуатации IV ver онлайн [27/58] 527077

Overhaul Instructions Si50-402

26 Semi-Hermetic Single Screw Compressor Version IV

2. Installing and Adjusting The Gate Rotor Bearings

(1) Installing the bearings

Cool the angular-contact ball bearing and the deep groove ball bearing down to -50°C or

less with dry ice or the like. Be sure to insert the bearing to the contact surface. Furthermore,

be sure to install the angular-contact bearing in the correct direction.

Fig. 4-27 Front and back sides of angular-contact ball bearing

Fig. 4-28 Direction of bearings

(2) Adjusting the preload (temporary assembly)

Install the gate rotor shaft in the lower bearing holders mounted with the bearings, and check

the preload of the bearings.

 Insert the gate rotor shaft into the bearings.

 Install gate rotor shims (2) and the gate rotor bearing retainer plate, and tighten the bolts

to the specified torque.

 Turn the gate rotor with full force by hand. At this time, it is desirable that the gate rotor

stops after it makes one or two rotation. If the gate rotor does not rotate smoothly or the

bearing produces a rolling sound, make adjustment of the shims in the following manner.

a) When rolling sound is produced

Reduce the thickness of the gate rotor adjusting shims, and check again.

b) When gate rotor does not rotate smoothly

Increase the thickness of the gate rotor adjusting shims, and check again.

 After adjustment, disassembly.

During disassembly, separate the shims, lower bearings and gate rotor shafts according

to their installation locations (upward and downward units) so that they can be reinstalled

in the original positions.