DE-STA-CO Output Overload Clutches Type F, FC, S, C, D, FC-SD, C-SD User Manual

Page 4

INSTALLATION AND REMOVAL
INSTRUCTIONS FOR SHRINK DISCS

Shrink Discs are supplied ready for installa-
tion. However, prior to tightening 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 perma-
nently contracted even at relatively low
tightening torques.

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, handtighten 3 or 4 equally
spaced locking screws and make sure that
outer collars of Shrink Disc are in a parellel
position. Afterwards handtighten rest of
locking screws.

4 Use torque wrench and equally tighten all

screws one after another in a clock or
counterclockwise sequence by approx.
1/4 turns (even if initially some screws will
require a very low tightening torque) until
specified tightening torque MA is reached.
NOTE: To compensate for bolt setting
during installation, a 5% higher than
specified tightening torque is recom-
mended for final tightening round.

5 Reset torque wrench and make sure that

no screw will turn at specified tightening
torque M

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
using approx. 1/2 turns, following either a
clock or counterclockwise sequence till Shrink
Disc can be moved on hub. DO NOT remove
locking screws completely.

2. Make sure any rust buildup in front of hub
is removed 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 conditions, 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 RAPlD-spray or paste

Screwthreads and head contact area:
Multipurpose grease like Molykote BR-2

Damaged O-rinqs should be replaced.

Inner Ring

Hub

Outer Collars

Metrix Hex Head Locking Screws
DIN 931, Grade 10.9

Shaft

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

LOCKING SCREW-TIGHTENING TORQUES "M

screw size

M10

M12

M16

M20

M24

M27

s mm

[Nm]

100

250

490

840

1250

[ft.-lbs]

3.6

8.7

185

362

620

922