Daikin ZH5LMGU [24/58] Replacing the bearing

Si50-402 Overhaul Instructions

Semi-Hermetic Single Screw Compressor Version IV 23

4.3 Replacing The Bearing

Unlike slide bearings, roller bearings have limited service life. They must be replaced regularly.

To prevent accidents caused by worn roller bearings, replace all roller bearings during an

overhaul.

4.3.1 Removing Bearings

1. Main Shaft Bearing

(1) Suction end cover (outer ring of cylindrical roller bearing)

 Remove the C-type retaining ring.

 Remove the outer ring of the bearing.

Use an ordinary bearing remover or special jig (2) to remove the outer ring.

(2) Screw shaft (inner ring of cylindrical roller bearing)

 Remove the C-type retaining ring.

 Remove the inner ring of the bearing by using a chisel.

Be careful not to scratch the screw shaft. If the screw shaft is accidentally scratched,

remove burrs by grinding the irregular surface.

Fig. 4-22 Removing inner ring of screw shaft bearing

(3) Main bearing holder (angular-contact ball bearing, deep groove ball bearing)

 Removing the beveled C-type retainer ring

The beveled C-type retainer is securely installed in the groove to keep the bearing in

place. For easy removal, first pry the end section of the C-type retainer ring toward

inside using snap-ring pliers.

Fig. 4-23 Removing C-type retainer ring