Mounting instruction 04 September 2015

Mounting instruction

011596 (replaces 0171-925)

Shaft seal for screw compressor types SAB 128 and 163

Shaft seal complete for SAB 128

Shaft seal HD complete for SAB 128 160 1 1332.068

Shaft seal complete for SAB 163

Shaft seal HD complete for SAB 163 160 1 1332.162

Each set consists of Pos. no. Quantity

Cast-iron seat

Rotating part with carbon face

Outer O-ring

Inner O-ring

O-ring for cover

the inside of the compressor is completely sealed off from the atmosphere.

The shaft seal type 680 has a built-in metal bellow in its rotating part which, apart from ensuring tightness, also

assimilates axial displacement and provides the necessary compressive force between the two slide faces men-

tioned below.

The shaft seal is a slide ring type, consisting of a stationary cast-iron seat, pos. A, which is positioned in the shaft

seal cover (80). Rotation is prevented by a pin, pos. 83.

The end face of the cast-iron seat is lapped to ensure that the slide face seals tightly. The O-ring, pos. C, seals

against the shaft seal cover (80).

The rotating part of the shaft seal, in which the carbon face, pos. F, is fitted, is fastened on the rotor shaft by

means of the 3 set screws, pos. E, and sealed by means of the stationary O-ring, pos. D.

ded holes of the flange to help release it.

Note that the holes are not threaded all the way, so it is advisable to insert a steel pin with dia. 8 x 40

before fitting the screw into the hole.

The oil splash ring, pos. 113, and the cast-iron seat, pos. A, will come out with the cover.

• After the 3 set screws, pos. E, have been loosened a couple of turns, the rotating part with the carbon

ring can now be pulled out over the shaft. Normally, auxiliary tools are not needed.

Mounting of the shaft seal

Due to the potential risk of releasing refrigerant and oil to the environment if installation is not performed with the

necessary care, it is important to follow this procedure closely:

• Thoroughly clean the shaft seal cover, pos. 80, and the rotor shaft. Pay special attention to burrs from the

balancing piston, pos.120. Remember to mount the piston again.

• Carefully press the rotating part over the rotor shaft until it touches the step of the rotor shaft as shown in

the drawing.

Make sure that the inner ring has full contact with the shaft step.

• Tighten the 3 set screws, pos. E, in turns until reaching slight contact with the shaft surface. Then careful-

ly cross-span with a slightly increasing torque while keeping aware that the rotating part must remain in

center with the rotor shaft. Finally tighten to the correct torque.

Use 4 Nm for the normal shaft seals, pos. no. 1332.068 and 1332.162.

Use 7.5 Nm for the HD shaft seals, pos. no. 1332.222 and 1332.223.

An Allen key is included in the delivery.

After carefully tightening, press the outer ring, without touching the carbon face, to make sure that the outer ring

can axially move freely on the shaft.

Install the static seat, pos. A, with the O-ring, pos. C, by pressing it into the cover until it gains contact with the

bottom face. Avoid touching the sliding face with your fingers, use a clean cloth or similar when pressing. Make

sure that the retaining pin, pos. 83, catches the slot in the seat.

Mount the oil throw-off ring, pos. 113.

Mount the coupling as described in the instruction manual, and turn the shaft by hand to check that it is running

Jens Lund Christensen

Lead Engineer, Quality & Technical Design

Industrial Refrigeration Parts Centre

Building Efficiency

Direct no.: +45 87 36 77 42

Fax no.: +45 87 36 75 05

e-mail: [email protected]