maintenance instructions
Model NBS--1
page 32 of 32
JARVIS
6207019:
®
PRODUCTS CORPORATION
33 ANDERSON ROAD, MIDDLETOWN, CONNECTICUT 06457-4926
UNITED STATES OF AMERICA E--MAIL.
TEL. 860-347-7271 FAX. 860-347-6978 WWW.
jarvisproducts.com
14.5 Remove screws (item 11) that secure right side
sprocket guard (item 10). Remove right side
sprocket guard.
14.6 Remove screws (item 12) that fasten sprocket hub
(item 13) to roller chain sprocket (item 14).
14.7 Loosen set screws in sprocket hub (item 13).
14.8 Place screws (item 12) into the three unused holes
located on the sprocket hub (item 13) to push the
roller chain sprocket (item 14) from sprocket hub
(item 13).
14.9 Remove sprocket hub (item 13) and roller chain
sprocket (item 14) from gear reducer (item 9).
Note: Do not attempt to move roller chain sprocket after
roller chain and screws (item 12) have been tightened.
Moving roller chain sprocket will damage the gear re-
ducer.
15 ROLLER CHAIN SPROCKET AND PILLOW
BLOCK BEARING DISASSEMBLY: IDLER END
Refer to figure D, page 7 for all referenced items unless
otherwise noted.
15.1 Turn off power to NBS--1.
15.2 Loosen chain tensioner screw (item 23) to loosen
roller chain (item 27).
15.3 Remove roller chain (item 27) by prying off
spring clips located on on connecting links (item
19).
15.4 Remove screws (item 11) that secure front left
side sprocket guard (items 38).
15.5 Remove screws (item 7) and split lock washers
(item 35) that fasten pillow block bearings (item
34) to frame and table (item 51, figure E, page 8).
15.6 Remove entire idler shaft assembly (items 12--15,
and 36) and pillow block bearings (item 34).
15.7 Loosen set screws on pillow block bearings (item
34) to separate bearings from idler shaft (item 36).
Refer to figure 12
. Remove pillow block bear-
ings.
15.8 Remove screws (item 12) that fasten sprocket hub
(item 13) to roller chain sprocket (item 14).
15.9 Loosen set screws in sprocket hub (item 13).
15.10 Place screws (item 12) into the three unused holes
located on the sprocket hub (item 13) to push the
roller chain sprocket (item 14) from sprocket hub
(item 13).
15.11 Remove sprocket hub (item 13) and roller chain
sprocket (item 14) from idler shaft (item 36).
15.12 Inspect pillow block bearings (item 34) for wear.
Replace if necessary.
16 ROLLER CHAIN SPROCKET AND PILLOW
BLOCK BEARING INSTALLATION: IDLER END
Refer to figure D, page 7 for all referenced items.
16.1 Reverse steps and procedures outlined in section
15.
See special notes below:
16.1.1 Align new roller chain sprocket (item 14) be-
fore tightening screws (item 12).
Screws
should only be “finger tight” until roller chain
socket is aligned. Beware sprocket will move
approximately 0.06 inch when being tight-
ened.
16.1.2 After attaching roller chain (item 27), push
carriage assembly back and forth to check for
any roller chain binding.
16.1.3 Pillow block bearings (item 34) are self--align-
ing. Manually adjust bearings to ensure idler
shaft assembly is sitting ”flat” on NBS--1
frame.
16.1.4 Tighten screws (item 12) evenly when roller
chain is aligned or roller chain sprocket (item
14) may wobble. Move carriage again to
check for any roller chain binding.
Note: Do not attempt to move roller chain sprocket after
roller chain (item 27) and screws (item 12) have been
tightened. Moving roller chain sprocket will damage the
pillow block bearings.
Figure 12
Set Screws
Pillow Block Bearing
