Focal176SR

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FOCAL TECHNOLOGIES INC.
40 Thornhill Drive, Unit 7, Dartmouth
Nova Scotia, Canada, B3B 1S1
Tel: (902) 468-2263 Fax: (902) 468-2249
email: info@focaltech.ns.ca
MODEL 176
ELECTRICAL SLIP RING
SERVICING MANUAL
Issue Date Changes
1 1998-Dec-2 Initial Issue
2 1999-Feb-19 Initial disassembly changed (Loctite 242™ used on
reassembly)
3 1999-Mar-4 Initial disassembly changed (Loctite 242™ used on
reassembly of flange and cable covers)
Document number AL1998L01-03
Model 176 ESR Servicing Handbook
Focal Technologies Inc. Page 2 of 8
AL1998L01-03
INTRODUCTION
This manual gives basic instructions on the disassembly, repair and reassembly of the Model 176
Electrical Slip Ring.
SPARE PARTS LIST
Item Refer to Description Part Number
No. Fig No.
1 5 Front Bearing 61815-2Z
2 4 Rear Bearing 6008-2Z
3 5 V-Ring (Viton) V-80A
4 5 O-Ring (main seal) 2-236 Viton
5 3 Power Brush Assy 119-0700-01
6 3 Signal Brush Assy (for 4 rings) 119-0142-02
7 3 Signal Brush Assy (for 6 rings) 119-0142-03
8 3 Signal Brush Assy (for 8 rings) 119-0142-04
9 3 Signal Brush Assy (for 10 rings) 119-0142-05
10 1 Flange “A” O-Ring 2-162 Buna N
11 1 Flange “B” O-Ring 2-152 Buna N
12 1 Torque Arm 119-0125-00
13 1 Relief Valve SS-4CPA2-3
14 1 Vacuum Purge Fitting 4-4FTX-SS
15 4 Power Ring 158-0075-00
16 4 Signal Ring 119-0127-00
17 4 Signal Ring Insulator 119-0128-00
18 4 1 kV Power Ring Insulator (1 pc.) 158-0074-00
19 4 3 kV HV Ring Insulator (3 pc.) 158-0072/0073/0018
20 3 Fibreglass rods (set of 6) 119-0112-00
21 5 Flange 119-1633-00
22 3 Brush Holder End Plate
23 N/A Armature Adaptor 158-0207-00
Model 176 ESR Servicing Handbook
Focal Technologies Inc. Page 3 of 8
AL1998L01-03
Item Refer to Description Part Number
No. Fig No.
24 3 Rear Bearing Plate 119-0509-00
25 4 Disc Spring (Belleville Washer) 1251280
26 N/A Front Spacer 119-0101-00
27 N/A Bearing Housing 119-0124-00
28 N/A Rear Spacer 119-0157-00
29 N/A Rear Bearing Housing 119-0122-00
30 N/A End Nut N-04
31 5 Shaft End Piece 119-1630-00
32 5 Bearing Housing 119-1634-00
33 5 Shaft (Up to approx. 36". Longer shafts 119-1631-05
request pricing by purchasing)
34 4 Bearing Adaptor 119-1668-00
35 4 Front Spacer 119-1635-00
36 3 Guide Bar Support 119-0123-00
37 N/A Shaft Collar 119-0141-00
38 N/A Ring Stack Support 119-1682-00
39 1 Insulation Tube 119-0508-00
40 4 Rear Spacer 119-0511-00
41 4 Spacer 179-0011-00
42 5 Retainer Ring 5102-293
43 4 Locknut KM8
44 N/A Slot Spring Tension Pin 1/8" dia X 1/4" LG.
45 1, 3, 5 Hardware Kit (includes all screws, washers,
nut and bolts required for reassembly)
Note: Items that have N/A in the Figure No column are not referenced in the diagrams that follow.
Note: Assembly procedures are the reverse of the disassembly procedures. Any special information
relating to reassembly are included in the disassembly procedures for the related part.
Model 176 ESR Servicing Handbook
Focal Technologies Inc. Page 4 of 8
AL1998L01-03
Initial Disassembly and Servicing (Refer to Figure 1)
The optional vacuum purge fitting (item 14), relief valve (item 13, not visible) or NPT plug can be
removed and replaced without disassembling the unit. When reassembling use sealant on the threads.
The flange and cable covers on either end can be removed by taking out the 6 hex socket screws
(item 45). Note that there is an o-ring (item 11) on either end. Use Loctite 242™ on the threads on
reassembly.
The torque arm (item 12) can be removed and replaced without disassembling the unit. Use
Loctite 270™ on the threads on reassembly.
The cover can be removed to service the inside of the unit by removing the 6 or 12 hex socket screws
(item 45). Note that there is an o-ring (item 10) between the cover and the flange. Use Loctite 242™ on
the threads on reassembly.
When removing the cover care must be taken not to damage the pigtails.
Once the cover is removed the insulation tube (item 39) can be removed. On very long units there may
be screws securing the insulation tube to the bearing housing (item 32, Figure 5) and rear bearing plate
(item 24, Figure 3).
Model 176 ESR Servicing Handbook
Focal Technologies Inc. Page 5 of 8
AL1998L01-03
FORJ Removal (Refer to Figure 2)
Refer to Figure 1 for information on disassembling the unit in preparation for removing the FORJ.
Prior to removing the FORJ the optical connections to the FORJ unit must be disconnected. Any lacing
used to secure the fiber optic cables or wire pigtails must be removed from the FORJ assembly.
The 3 hex nuts securing the FORJ to the FORJ standoffs must be removed.
When removing the FORJ unit, care must be taken to avoid damaging the pigtails which are routed
through the slip ring. If the pigtails can be accessed at the flange it may be possible to feed them into
the end of the flange as the FORJ is pulled off. This may not be possible (e.g. if pigtails have shielding),
in which case the optical connections on the FORJ can be disconnected through the hole in the cover
tube.
The torque adaptor can be removed by taking out the 4 hex socket screws securing it to the bearing
adaptor (item 34, Figure 4).
Note: It may be advantageous to remove the torque adaptor later if the ring stack is going to be
disassembled.
When reassembling ensure the torque adaptor is centered on the bearing adaptor.
Model 176 ESR Servicing Handbook
Focal Technologies Inc. Page 6 of 8
AL1998L01-03
Removal of Brush Gear (Refer to Figure 3)
Refer to Figures 1 and 2 for information on disassembling the unit in preparation for servicing the brush
assemblies.
The brush assemblies can be removed from the ring stack by taking out the screws (item 45) securing
the fiberglass rods (item 20) to the rear bearing plate (item 24) and the guide bar support (item 36). Any
lacing used to secure the wires must be removed.
It is not necessary to remove the brushes from the rods unless they require servicing. The entire brush
assembly can be removed from the ring stack without disassembly.
If the brushes (items 5 or 6, 7, 8, 9 & 22) are to be replaced they must be removed from the support rods
and the wire removed.
Ensure that the replacement brush is aligned axially (i.e. in the center of the ring) on the ring when the
unit is reassembled. If the brush is not properly centered it could contact the ring spacer resulting in
potential electrical problems or expensive damage to the ring stack.
Model 176 ESR Servicing Handbook
Focal Technologies Inc. Page 7 of 8
AL1998L01-03
Ring Stack Disassembly (Refer to Figure 4)
Refer to Figures 1, 2 and 3 for information on disassembling the unit in preparation for servicing the ring
stack.
Note: The wires inside the ring stack will make it very difficult to remove the rings and spacers
as one unit. There may be supports (item 38, Spare Parts list) inside the ring stack which will
also make removing the rings difficult. It is recommended that the rings be removed one at a
time (or in small groups if the attached wires are part of a cable assembly such as a twisted pair
or shielded quad).
Remove the locknut (item 43) from the bearing adaptor (item 34).
Note: Removal of the locknut may be very difficult (it was secured using Loctite 592™ Pipe
Sealant on assembly). The bearing adaptor has been secured to the shaft (item 33, Figure 5)
using a spring tension pin (item 44 on Spare Parts list) with Loctite 270™ on the threads. 
Additionally the shaft has been secured to the shaft end piece (item 31, Figure 5) using a spring
tension pin and Loctite 270™ . It is very likely that attempting to remove the locknut without
securing the bearing adaptor against rotation will result in having one of the spring tension
pins sheared off. A special tool is available for this purpose, contact the factory.
When reassembling the ring stack the locknut must be torqued to 50 ft/lbs.
Model 176 ESR Servicing Handbook
Focal Technologies Inc. Page 8 of 8
AL1998L01-03
Remove the bearing (item 2), the spacer (item 41), the disc spring(item 25) and the rear spacer
(item 40).
The rings and spacers can be removed. Carefully pull them over the bearing adaptor.
The front spacer (item 35) can be removed once all the rings have been removed.
Flange Disassembly (Refer to Figure 5)
Refer to Figures 1, 2, 3 and 4 for information on disassembling the unit in preparation for servicing the
flange assembly.
The bearing housing (item 32) can be removed by taking out the 3 hex socket screws (item 45).
Loctite 270™ must be used on the screw threads during reassembly.
The bearing (item 1) can be removed by taking off the retaining ring (item 42). The bevelled side of the
retaining ring must oriented up on reassembly.
The flange (item 21) can now be removed giving access to the v-ring (item 3) and the o-ring (item 4). 
The o-ring should be lightly greased on reassembly.