Johnson Controls Frick 852 User Manual

RWH ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.620-IOM (DEC 12)
Page 28
5. Place seal spring on shaft against rotor hub. Refer to
Figure 31.
6. Slide rotary member, with lapped contact surface fac
ing away from spring, over installation sleeve on shaft until
just con tacting the spring. Do not compress spring. Remove
installa tion sleeve.
7. Coat rotor shaft with refrigeration oil. Install shaft slowly
pushing until the ends of rotor teeth are just below the face
of the casing.
8. Leave the rotor in this position. Withdrawal of rotor and
shaft may displace the carbon seal rotating face and result
in damage to the seal.
9. Place Oring gasket on head and install head and idler
assembly on pump. Pump head and casing were marked
before disassembly to ensure proper reassembly. If not, be
sure idler pin, which is offset in pump head, is positioned up
and equal distance between port connections to allow for
proper ow of liquid through pump.
10. Tighten head capscrews evenly
11. Pack inner ball bearing with multipurpose grease, NLGI
#2.
GG, HJ, HL: Install bearing in casing with sealed side towards
head end of pump. Drive the bearing into the bore. Tap the
inner race with a brass bar and lead hammer to position
bearing. Install inner snap ring.
AS, AK, AL: Install bearing retainer washer over the shaft
before installing ball bearing. Install ball bear ing in casing with
sealed side towards head end of pump. Drive the bearing
into the bore. Tap the inner race with a brass bar and lead
hammer to position bearing.
12. GG, HJ, HL: Install shaft snap ring in groove in the shaft.
See Figure 28.
AS, AK, AL: Install bearing spacer over shaft and against
single row ball bearing. See Figure 29.
13. Pack lubrication chamber between inner ball bearing and
doublerow ball bearing in the thrustbearing assembly ap
proximately onehalf full of multipurpose grease, NLGI #2.
The thrustbearing assembly will take the remaining space.
See Figure 28 and 29.
14. Pack doublerow ball bearing with multipurpose grease,
NLGI #2.
GG, HJ, HL: Install ball bearing into bearing housing with
shield side toward coupling end of shaft. See Figure 28. Install
snap ring into bearing hous ing to retain ball bearing. This
snap ring has a tapered edge to t tapered groove in bearing
housing. The tapered edge is located away from ball bearing.
AS, AK, AL: Install ball bearing into bearing housing. In stall
lip seal in bearing housing end cap. The lip should face to
wards end of shaft. Put bearing spacer collar in lip seal and
install in bearing housing and tighten setscrews se curely.
See Figure 29.
15. Insert brass bar or hardwood through port opening be
tween rotor teeth to keep shaft from turning.
16. Start thrustbearing assembly into casing. Turn by hand
until tight. This forces rotor against head. Replace and tighten
locknut or shaft.
17. Remove brass bar or hardwood from port opening.
18. Adjust pump end clearance.
DANGER
BEFORE STARTING PUMP, ENSURE THAT ALL DRIVE
EQUIPMENT GUARDS ARE IN PLACE. FAILURE TO
PROPERLY MOUNT GUARDS MAY RESULT IN SERIOUS
INJURY OR DEATH.
THRUST BEARING ADJUSTMENT
See Figures 28 and 29.
Loosen two screws in face of thrustbearing assembly. If
shaft cannot be rotated freely, turn thrustbearing assembly
counterclockwise until shaft can be turned easily.
1. While turning rotor shaft, rotate thrustbearing assem
bly clockwise until noticeable drag occurs. This is zero end
clearance.
2. Mark position of bearing housing with respect to the
casing.
3. Rotate thrustbearing assembly counterclockwise the
dis tance listed below as measured on outside of bearing
hous ing.
4. Tighten two setscrews in face of bearing housing after
adjust ment is made to secure thrustbearing assembly posi
tion.
For viscosities above 2500 SSU, add additional end clearance
(0.004" for GG, HJ and HL size pumps and 0.005" for AS, AK
and AL size pumps).
Pump Distance (in.) on O.D. End Clearance
Size of Bearing Housing (in.)
GG 7/16 .003
HJ, HL 9/16 .003
AS, AK, AL 1/2 .003
INSTALLATION OF
CARBON GRAPHITE BUSHINGS
When installing carbon graphite bushings, extreme care must
be taken to prevent breaking. Carbon graphite is brittle and
easily cracked. If cracked, the bushing will quickly disinte
grate. Using a lubricant and adding a chamfer on the bushing
and the mating part will help in installation. The additional
precautions listed below must be followed for proper instal
lation:
1. A press must be used for installation.
2. Be certain bushing is started straight.
3. Do not stop pressing operation until bushing is in proper
position. Starting and stopping will result in a cracked bush
ing.
4. Check bushing for cracks after installation.

Johnson Controls Frick 852 Specifications

General

Brand	Johnson Controls
Model	Frick 852
Category	Compressor
Language	English