Daikin (A)5LLF, Service Manual

Page: 23 / 51

Overhaul Instructions Si50-203
22 Semi-Hermetic Single Screw Compressor Version III
4.2.2 Installation of Bearings
Before installing the bearings, clean the bearing holder and suction end cover.
1. Main Shaft Bearing
(1) Suction end cover (outer ring of cylindrical roller bearing)
Hammer the periphery of the outer ring of the cylindrical roller bearing to insert the bearing
into the suction end cover bearing housing. Be careful not to damage the bearing when
installing. Hammering the roller section can damage the holding section. After the bearing
is installed securely in the housing, mount the C-type retainer ring to secure the bearing.
(2) Screw shaft (inner ring of cylindrical roller bearing)
Heat the inner ring of the bearing (120°C max.), and insert the tip of the screw shaft.
After the shaft is inserted, place a plate and hammer the shaft all the way. Then, mount the
C-type retainer ring.
(3) Main bearing holder (angular-contact ball bearing, deep groove ball bearing)
Insert the bearings into the main bearing holder. Since fitting is tight, cool the bearings to a
temperature of -50°C or lower using dry ice. After inserting the bearings, mount the beveled
C-type retainer ring.
!
Be sure to install the bearings in the correct direction.
!
The beveled C-type retainer is tapered. After installation, hammer it into the groove.
Fig. 4-24 Direction of bearings