Nexen QFB-2200 963999 - Manual (Page 4)

FORM NO. L-20297-C-0603 4
INSTALLATION
Figure 1
Figure 2
DFB
NOTE: Nexen’s spring-engaged, air-disengaged Dual
Faced Brakes (DFB) and Quad Faced Brakes (QFB)
are designed for horizontal shaft mounting only.
1. Provide a piloting flange with a pilot diameter of
21.375 inches [542.9 mm] for the DFB/QFB 2200
or 24.375 inches [619 mm] for the DFB/QFB
2500.
2. Drill and tap twelve 5/8-11 holes on a bolt circle of
25.500 inches [647.7 mm] for the DFB/QFB 2200
or 28.750 inches [730.3 mm] for the DFB/QFB
2500 in the bearing supported device or machine
component prior to installing either the DFB or
QFB.
Note: Control perpendicularity between the shaft and
housing mounting surface. Use a Deal Indicator for
measurements. Perpendicularity should be less than
0.015 TIR (See Figure 1).
3. Install the customer supplied keys into the shaft.
4. Lubricate the splines of the Hub (Item 1) with
Never-Seez or an equivalent high temperature, anti-
seize lubricant (See Figures 2 and 3).
5. Slide Hub (Item 1) over keys and onto the shaft
(See Figures 2 and 3).
Note: Axial location of the Hub is important. Refer to
Figures 2 and 3 for the correct Hub location.
6. Secure the Hub (Item 1) to the machine shaft.
a. On the DFB, use the two Set Screws (See
Figure 2).
b. On the QFB, use the two Socket Head Cap
Screws and Lock Washers (See Figure 3).
7. Screw a 3/8-16 eye bolt into the top of the DFB or
QFB and lift the DFB or QFB into position (See
Figures 2 and 3).
8. Apply Loctite ® 242 to the threads of twelve
customer supplied 5/8-11 socket head cap screws
and secure the DFB of QFB to the machine or
mounting surface (See Figures 2 and 3).
9. Alternately and evenly tighten the twelve customer
supplied socket head cap screws to 145 ft-lb
[196.59 Nm] torque.
Eye Bolt
7.053 in [179.146 mm]
from Hub face to housing
mounting surface
Customer supplied socket
head cap screws.
Set Screws
Hub
(Item 1)
Figure 3
QFB
Customer supplied
socket head cap screws
Socket Head
Cap Screws and
Lock Washers
Eye Bolt
8.933 in [226.898 mm]
from Hub face to housing
mounting surface
Hub
(Item 1)
Dial Indicator