Rear High-Speed Bearing Components - York YDHF-39 Manual

Compressor Service

REAR HIGH-SPEED BEARING COMPONENTS

Rear High-Speed Bearings are of 2
slightly different designs.
• The original design, shown in Fig.
49, is applicable to G, HA and HB
compressors.
• The second design shown in Fig. 59
is applicable to HD and HF design
levels.
• (Refer to Compressor Codes in table
on front cover, and Nomenclature on
page 5).
RETAINER
"O" RING
HIGH-SPEED
FORWARD
THRUST
BEARING
HIGH-SPEED
THRUST
COLLAR
HIGH-SPEED
HIGH-SPEED
REVERSE
BEARING
THRUST
(REAR)
BEARING
FIG. 49 – HIGH-SPEED BEARING COMPONENTS -
REAR (H COMPRESSORS - DESIGN
LEVELS A, B, & C; J COMPRESSORS)
To remove/replace any of the components shown in Fig.
49, proceed as follows:
1. Remove the Proximity Probe.
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".
26
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)
5. Remove the cap screws that hold the high-speed
thrust collar to the high-speed shaft. (See Fig. 53).
Remove the thrust collar. (1/4"-20 puller holes are
provided for convenience.)
6. Remove the high-speed forward thrust bearing. (See
Fig. 54). #10-24 puller holes are provided for con-
venience. When inserting puller bolts, use care that
bearing pads are not damaged. Note position of in-
dexing roll pin and mating hole in casing. (See Fig.
55)
7. Remove the cap screw holding the high-speed bear-
ing retainer clip to the casing. (See Fig. 56). Using
items from the tool kit as shown in Fig. 57, remove
the bearing from the compressor.
8. Inspect all parts removed above. See "Cleaning
And Checking Parts", page 6. Replace with new
parts as necessary.
HIGH-SPEED
REVERSE
THRUST BEARING
PROXIMITY
29439A
PROBE LOCATION
(NOT SHOWN)
HIGH-SPEED
REVERSE
THRUST BEARING
(INSIDE SURFACE)
FIG. 50 – HIGH-SPEED REVERSE THRUST BEARING
26664A
26662A
YORK INTERNATIONAL