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7032 SOUTH 196th - KENT, WA. 98032 - (206) 872-0141 / FAX (206) 872-8710

MODEL 50/75 AUGER

OPERATION / MAINTENANCE MANUAL

Shrink Discs are supplied ready for
installation. However, prior to tighten-
ing of locking screws it is necessary
to remove wooden spacers located
between outer collars, which are used
during shipment of Shrink Discs.

INSTALLATION

Important:
Never tighten locking screws before
shaft Installation, since inner ring of
Shrink Discs as well as hub can be
permanently contracted even at rela-
tively low tightening torque.

1. Clean hub O.D. and Shrink Disc bore and lightly
lubricate hub O.D. before assembly of Shrink Disc
on hub.
2. Carefully clean shaft and hub bore from any
lubricant prior to mounting hub onto shaft. THIS
STEP IS VERY IMPORTANT, since it will greatly
affect the torque transmitting capability of a Shrink
Disc connection.
3. After checking correct position of Shrink Disc
and hub, hand tighten 3 or 4 equally spaced lock-
ing screws and make sure that outer collars of
Shrink Disc are in a parallel position. Afterwards
hand tighten rest of locking screws.
4. Use torque wrench and equally tighten all
screws one after another in a clock or counter-
clockwise sequence by approx. 1/4 turns (even if
initially some screws will require a very low tight-
ening torque) until specified tightening torque MA
is reached.
NOTE: To compensate for bolt setting during in-
stallation, a 5% higher than specified tightening
torque is recommended for final tightening round.
5. Reset torque wrench and make sure that no
screw will turn at specified tightening torque MA.

screw size

M10

M12

M16

M20

M24

M27

[Nm)

100

250

490

840

1250

[ft.-lbs]

3.6

8.7

185

362

620

922

NOTE: It is not necessary to check tightening torque
again after installation is completed or equipment
has been in operation.

REMOVAL
1. Loosen locking screws in several stages by us-
ing approx. 1/2 turns, following either a clock or coun-
terclockwise sequence till Shrink Disc can be moved
on hub. DO NOT Remove locking screws com-
pletely.
2. Make sure any rust build up in front of hub is re-
moved before hub is pulled from shaft.

RE-INSTALLATION OF SHRINK DISC
In relatively clean operating conditions, Shrink Discs
can be re-used without prior cleaning. Severe con-
ditions, however, require thorough cleaning and re-
lubrication with the following or similar lubricants:

Tapers of inner rings and outer collar bores:
Molykote 3321 R-spray or Molykote G RAPID-spray
or paste
Screw threads and head contact area:
Multipurpose grease like Molykote BR-2

LOCKING SCREW-TIGHTENING TORQUES "M

Inner Ring

Hub

Figure 5-A. Coupling Componants

V. MAINTENANCE (Continued...)

V-3. Coupling Maintenance.

IMPORTANT!
Carefully Clean
Shaft & Hub Bore
Keep Free of Any
Lubricant

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