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As indicated in Table 2, different solid shaft tolerances are
suggested depending upon the load type.

• If the machine load conditions are considered “Uniform”

a clearance ﬁ t is allowed.

• If the machine load conditions are considered to have

“Shock Load” a light clearance to interference ﬁ t condi-

tion is suggested.

Typically the machine builder will have good knowledge as to
the load type. As an alternate method to classify load type,
one could follow the “Mass Acceleration Factor Selection
Method” that is discussed in NORD’s product catalog/s.

Straightness, roundness, and diameter tolerance variations
of both shafts should be controlled as accurately as possible.
When mating, solid shaft design features are not controlled,
reducer installation may be very difﬁ cult without ordering
special hollow-bore design features to accomodate.

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HARMFUL SITUATION

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The supporting solid shaft or driven machine shaft must
be of adequate size and strength to withstand normal
operating loads and peak loads without damage to itself
or any of the system components.

5. Suggested solid-shaft mating shaft surface ﬁ nish

Controlling the mating shaft surface ﬁ nish helps to assure
proper ﬁ t and assembly while minimizing the possibility of
corrosion and fretting. NORD recommends that the mat-
ing solid shaft surface should be at least 125 micro-inches
(3.2 microns) or smoother.

6. Assembly to the machine shaft

A. Clean and remove any dirt, grease, or rust-preventative
coatings from both the reducer hollow shaft and the
machine

shaft.

B. Make sure the edges of both the reducer hollow shaft and

machine shaft are free from any nicks or burrs. If nicks

or burrs are present remove them using an abrasive

material such as an emery cloth.

C. Before installing the gear reducer onto the machine
shaft, apply an anti-seize compound or anti-corrosive
lubricant to the mating shafts as shown in Figure 1.

Assembly and subsequent dismantling will be aided by the

anti-seize

agent.

Figure 1 – Application of anti-seize to the mating shafts

Apply to bore land area

Apply to machine shaft

D. Fit the shaft key/s into place on the machine shaft.

Depending upon the key slot design on the machine shaft,

it may be necessary to stake or Loctite

the key/s into place

so they do not slide axially while ﬁ tting the reducer to the

shaft.

E. Lift the gear unit assembly into place and align it carefully

with respect to the machine shaft.

F. Fit the gear unit assembly onto the machine shaft using a

suitable pulling device.

G. Secure the reducer onto the machine shaft in an axial

direction, to prevent the reducer from shifting or walking

out of place during operation.

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HARMFUL SITUATION

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Do not use excessive force or try to hammer the gear unit
into place. The housing, shafting, bearings or gear wheels
may become damaged.

7. Securing the reducer onto the machine shaft

There are slight shaft oscillations during operation in any ro-
tating shaft equipment or any shaft-mounted reducer assem-
bly. Therefore it is important to secure the reducer in an axial
direction onto the machine shaft, to prevent the reducer
from shifting or walking out of place during operation.

Possible methods to secure the reducer axially to the machine
shaft include:

• Using commercial set collars, retaining rings, or snap rings.

• Using the optional “NORD Fixing Element Kit”
(see

U10280).

The NORD Fixing Element Kit includes all of the necessary
parts to secure the shaft by using a tapped hole in the end of
the mating male shaft.

Loctite

is a registered trademark of Loctite Corporation

U.S.A. and Henkel.

DRIVESYSTEMS

KEYED HOLLOW SHAFT

RETAIN FOR FUTURE USE

U10270 - 2 of 2