York SAB 202 User guide

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Mounting Instruction
A newsletter from YORK Refrigeration, Technology & Products
Christian X’s Vej 201, P O Box 1810, DK-8270 Højbjerg, Denmark
Phone [phone], Fax [phone]
03 October 00
Subject: Mounting of Internal Seal to Prevent Oil Leakage on
SAB 202 Screw Compressor
Fig. 1
156E
156D
156G
156C
156F
156A 156I 156B 113
156H
156K
160A
160E

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Position No. Designation Quantity
156 AA Shaft seal cover SM/LM 1
156 AB Shaft seal cover SF/LF 1
156 B Balance piston 1
156 C Slide ring 1
156 D Sealing ring 1
156 EA Retaining ring for 156 D, SM/LM 1
156 EB Retaining ring for 156 D, SM/LF 1
156 F O--ring, dia. 88.49 x 1
156 G O--ring, dia. 107.54 x 1
156 H O--ring, dia. 142.47 x 1
156 I Countersunk screw 4
156 K Cylinder screw 2
When the compressor has been in operation for a long period of time, the oil in the shaft
seal chamber, which helps to keep the shaft seal gas-tight, will drain away from the
chamber, making it possible for small amounts of refrigerant to leak from the shaft seal.
To avoid this situation, the enclosed seal set can be mounted in the compressor so that the
oil stays in the shaft seal chamber and keeps the sliding surfaces of the shaft seal lubri-
cated and gas-tight.
Dismounting of Compressor Shaft Seal
Dismount the compressor shaft seal as described in the Instruction Manual, no. 0178-250,
Section 4.
Be very careful not to damage the lapped sliding surfaces of the two slide rings as even the
smallest scratch will reduce the tightness of the shaft seal.
When the shaft seal has been removed, the screws pos. 113 and the balance piston pos.
134 (see the drawing in the Instruction Manual) can be pulled out by means of the two
threaded pins no. 3, part no. 3083-171, from the tool set. The pins are fastened in the two
threaded holes in the balance piston. Both the balance piston and the shaft seal cover pos.
165 must not be used again.
Mounting of Shaft Seal and Internal Oil Seal Set
After cleaning the shaft seal parts and the compressor shaft and checking them for
scratchesandmarks,oilallsurfaceswiththesametypeofoilwhichisusedinthecom-
pressor. Now the shaft seal and seal set are ready to be mounted.
SFirst place the balance piston pos. 156B (see fig. 1) from the seal set on the compressor
shaft and turn it so that it is possible to mount the screws pos. 113. Tighten the screws to

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the torques indicated in the Instruction Manual. Make sure that the O-ring pos. 156F has
been fitted in the balance piston before the piston is mounted.
SMount the rotating part of the shaft seal pos. 160A and tighten it by means of the
pointed screws pos. 160E. Make sure that the O-ring has been mounted in the rotating
part.
SMount the slide ring pos. 156C which is tightened by means of the four countersunk
screws pos. 156I. Make sure that the O-ring pos. 156G has been mounted.
Before mounting the shaft seal cover pos. 156A on the compressor block, carry out the fol-
lowing:
SPress the sealing ring pos. 156D into the retaining ring pos. 156E. It must be turned
asshowninthedrawingfig.2andmustonlybepressedsofarintotheretainingring
that the two surfaces are flush with each other as illustrated in fig. 2.
Fig. 2
156D
Plane
156E
SFit the retaining ring pos. 156E in the shaft seal cover pos. 156A. Turn it so that the
two screws pos. 156K can be mounted and tightened. Make sure that the O-ring pos.
156H has been mounted on the retaining ring.
Note, moreover, that there are two types of shaft seal covers and retaining rings for male
and female compressor. The many bored holes in the retaining ring must be placed
above the centre line of the compressor shaft when the shaft seal cover has been fitted
on the compressor.
SMount the cast iron seat pos. 160B and the O-ring pos. 160D in the shaft seal cover.
Make sure that the pin pos. 161 catches the slot in the cast iron seat.
SMount the O-ring pos. 164.
SMove the shaft seal cover carefully over the compressor shaft until it touches the rotating
part of the shaft seal. Before the screws pos. 167 are tightened, there must be a gap of
3-4 mm between the two flanges as illustrated in fig. 4.1 in the Instruction Manual.

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It is recommended to tighten the screws pos. 167 one at a time so that the shaft seal is not
damaged due to uneven tightening. Tighten the screws to the torques indicated in the In-
struction Manual.
SMount the oil splash ring pos. 162. Fit the coupling for the motor as described in the In-
struction Manual and turn the compressor shaft manually to check that it is able to rotate
without hindrance.
Dismantling of Shaft Seal and Internal Oil Seal Set
The dismantling is carried out in reverse order compared to the description above. However,
please note the following:
STo be able to dismount the rotating part of the shaft seal, it is necessary to dismantle the
slide ring pos. 156C by dismounting the screws pos. 156I. Now it is possible to loosen
the three pointed screws pos. 160E (see the Instruction Manual) and pull out the rotating
part of the shaft seal.
SThe retaining ring pos. 156E can be pulled out through the two M6 threaded holes in the
end surface.
SThe balance piston pos. 156B can be pulled out by means of the two threaded pins no.
3 from the tool set. The pins can be mounted in two of the M6 holes in which the screws
pos. 156K are usually mounted.
YORK REFRIGERATION
Chr. X’s Vej 201 ·P. O . B ox 181 0 ·DK-8270 Højbjerg ·Denmark
Phone[phone] ·Fax [phone]