Warner Electric FB-375, 475, 650 - Manual (Page 4)

4 Warner Electric • 800-825-9050 P-237 • 819-0289
Installation Instructions
Sizes FB-375 Through FB-650
Installing the Brake
Note: Failure to set autogap using the
procedures in this manual may cause
overheating and premature failure.
Step1:
The first installation step applies only to the
optional motor adapter (See Figure 1). For
installation on a double shaft extension motor or
through shaft, proceed to Step 2A for the FB-375
or Step 2B for the FB-475 or FB-650.
All parts must be clean and free from burrs or
chips before assembly. Insert the motor shaft key
in the motor shaft. Tighten the motor adapter set
screws. Insert the sheave or sprocket key into
the motor adapter keyway. Install the sheave or
sprocket on the motor adapter either with a
tapered bushing or straight bore. Install the belts or
chain. To assemble the brake on the motor adapter
proceed to Step 2A for the FB-375 or Step 2B for
the FB-475 or FB-650.
Step 2A:
Check to insure that all parts are clean and
free from burrs and chips. Insert the key in
the shaft extension keyway. Slide the brake
assembly into position on the shaft extension
(See Figure 1 or 2). Tighten the set screws.
Go to Step 3.
Step 2B:
Check to insure that all parts are clean and free
from burrs or chips. Insert the key into the shaft
keyway. Place the bushing into the hub and match
half holes to make complete holes. Each hole will
be threaded on one side only. Place the screws
loosely into the holes which are threaded on the
hub side. Slip the assembly onto the shaft and
locate it in the desired position (See Figure 3).
Tighten the screws alternately and evenly until all are
pulled up very lightly. Tap against the large end of
the bushing with a plastic hammer to avoid
damaging the bushing. The screws can then be
tightened again, using the following torque
specifications:
FB-475 55 in. lb.
FB-650 175 in. lb.
Repeat this alternate tapping and retightening until
the specified wrench torque no longer turns the
screws.
Motor Shaft
Brake Key
Set
Screws (2)
Shaft
FB-375
Figure 1
FB-375 with Motor Adapter
Sheave Key Motor Shaft
Key
Motor
Shaft
Set
Screws (2)
Set
Screws (2)
FB-375
Adapter
Electrically
Released
Brake Key
Figure 2
FB-375 without Motor Adapter