York YDHF-39 Manual page 29

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 provide for convenience)
6. Loosen but do not remove the (3) hex socket head
cap screws that hold the high-speed forward thrust
bearing to the high-speed bearing.
7. Use the #10-24 puller rods to pull the high-speed
forward thrust bearing and high-speed bearing from
the compressor.
8. Inspect all parts removed above. See "Cleaning
And Checking Parts", page 6. Replace with new
parts as necessary.
REAR HIGH-SPEED BEARINGS INSTALLATION – G
AND H COMPRESSOR DESIGN LEVELS A, B, &C AND
ALL J COMPRESSORS
1. Be sure the bearing surface of the high-speed shaft
is clean and is in good condition.
2. Apply a light coating of oil and Molykote to the high-
speed shaft and to the inside and outside surfaces
of the rear high-speed bearing.
3. Carefully slide the high-speed bearing with the bear-
ing retainer clip into position. Insert cap screw into
the retainer clip and tighten.
4. Apply a light coating of oil and Molykote to the in-
side diameter and pads of the forward thrust bear-
ing. Reinstall the forward thrust bearing taking care
that the roll pin enters the hole in the compressor
casing. (See Fig. 55)
PROXIMITY
PRESSURE
SWITCH
FIG. 60 – HF PROXIMITY SWITCH
YORK INTERNATIONAL
BRASS
TUBE
00591VIP
5. Apply a light coating of oil and Molykote to both
sides of the thrust collar. Install the thrust collar and
tighten (4) hex socket cap screws to the high-speed
shaft. Check run-out of shaft collar. Maximum run-
out is .001".
6. Apply a light coating of oil and Molykote to the pads
of the high-speed reverse thrust bearing. Install re-
verse thrust bearing using a new o-ring. Be sure oil
passages in the bearing line up with the oil passages
in the compressor casing.
7. Re-install the Proximity Probe.
After reinstalling the Proximity
Probe, a Calibration Procedure,
as outlined in Form 160.49-M2, must
be performed before restarting the
compressor.
REAR HIGH-SPEED BEARINGS INSTALLATION – HD
AND HF COMPRESSORS
1. Be sure the bearing surface of the high-speed shaft
is clean and is in good condition.
2. Apply a light coating of oil and Molykote to the high-
speed shaft and to the inside and outside surfaces
of the rear high-speed bearing. On HF style com-
pressors install new o-ring on high-speed bearing.
3. Apply a light coating of oil and Molykote to the
inside diameter and pads of the forward thrust
bearing.
4. Insert but do not tighten the (3) hex head socket
screws that hold the high-speed forward thrust bear-
ing to the high-speed bearing.
5. Carefully slide the high-speed bearing and high-
speed forward thrust bearing into position. Be sure
the roll pin on the forward thrust bearing enters the
hole in the compressor casing. Tighten the (3) cap
screws that secure the forward thrust bearing to
the high-speed bearing.
6. Apply a light coating of oil and Molykote to both
sides of the thrust collar. Install the thrust collar and
tighten the (4) hex socket cap screws to the high-
speed shaft. Check run-out of shaft collar. Maxi-
mum run-out is .001".
7. Apply a light coating of oil and Molykote to the pads
of the high-speed reverse thrust bearing. Install re-
verse thrust bearing using a new o-ring. Be sure oil
passages in the bearing line up with the oil passages
in the compressor casing.
FORM 160.49-M1
2
29