York YDHF-39 Manual page 28

Compressor Service
FIG. 57 – HIGH-SPEED REAR BEARING REMOVAL
FIG. 58 – HIGH-SPEED BEARING COMPONENTS -
REAR (G, HA & HB COMPRESSORS)
REAR HIGH-SPEED BEARINGS REMOVAL –
HD AND HF COMPRESSORS
To remove/replace any of the components shown in Fig.
59, proceed as follows:
1. Remove the Proximity Probe or Pressure Switch
assembly.
28
On HF style compressors the Proxim-
ity Probe has been replace with a pres-
sure switch. (See Fig. 60). This pres-
sure switch is installed on a brass tube
that has its tip protruding into a
groove on the High Speed Thrust Col-
lar. If the thrust tolerance exceeds a
determined distance, the sacrificial
brass tip will wear through, pressur-
LD04840
ize the tube with oil and trip the pres-
sure switch to shut down the chiller.
2. Remove the cap screws holding the high-speed re-
verse thrust bearing and remove the bearing. (See
Fig. 50). Note alignment of oil passages.
3. Before removing the high-speed thrust collar, it is
advisable to measure the run-out on the collar face.
Mount a dial indicator as shown in Fig. 51 and ro-
tate the compressor shaft to record run-out. Maxi-
mum run-out is .001".
4. To remove the high-speed thrust collar, it is neces-
sary to lock the shafts using the gear locking tool
from the tool kit. (See Fig. 52)
00280VIP
FIG. 59 – HIGH-SPEED BEARING COMPONENTS -
REAR (HD & HF COMPRESSORS)
00281VIP
YORK INTERNATIONAL