Hubbell Gear Drive Electric Cable Reels SM21 Installation And Maintenance Instructions

Installation and MAINTENANCE INSTRUCTIONS
SM21 GEAR DRIVE ELECTRIC CABLE REELS
All units are provided with right hand rotation unless otherwise
specified. This means that cable is pulled off spool top left
or bottom right (spool rotates clockwise to wind cable) when
viewing spring end of reel. See diagram on parts page.
Clock-type springs provide power for automatic cable take-
up. Spring must be pretensioned at time of installation to
ensure that tension is applied to cable at all times. A tension
adjustment ratchet wrench is provided with each reel.
!
Do not attempt to relieve spring tension using spanner
wrench. Doing so may result in personal injury.

INSTALLATION

1. Ensure that machinery to be serviced by reel is at position
closest to reel.
2. Securely mount reel in desired position using 1/2"(M12)
bolts. Be sure spool is aligned with cable run.
3. Position optional cable guide, if reel is so equipped. See
Cable Installation DRAWING
4. Connect free end of cable to junction box on machine or
adjust cable stop so that desired length of cable extends
from reel.
5. Remove ratchet wrench and cover plate on spring housing
to expose shaft and spring hub. (See Figure 1).
6. Reinstall ratchet wrench (Fig 2). Use long handled wrench
to rotate arbor driver clockwise (for standard rotation).
Number of 360° turns should match last digit in model
number on serial plate.
"R", reel is reverse rotation and wrench must be rotated
counterclockwise. (See EXPLANATION on parts list page.)
!
CAUTION
Do not exceed number of turns indicated on
serial plate. Over-tensioning can cause a
broken spring, sheared shaft or other damage.
NOTE: On reels containing more than one spring, the hubs
are connected at the factory. Therefore, by tightening the
outer spring, the inside spring(s) will be tightened.
7. Remove wrench and install on other spring stack. Add
pretension turns as in step 6, above. Springs on both sides
must be adjusted equally. Remove wrench, replace cover
plates and return wrench to stored position.
8. Remove collector cover and connect individual supply
conductors to collector terminals. See ELECTRICAL
CONNECTIONS diagram, on parts page.
WARNING
If model number includes an
For reels manufactured after April 16, 2001

MAINTENANCE

Periodically: A. Use compressed air to clean collector assembly
and inside of collector housing. Inspect collector assembly for
brush wear and pitted slip rings.
B. Inspect cable for wear and
check mounting bolts and other
hardware for tightness.
C. Check for broken springs by
pulling about 2/3 cable off reel
and observing "Broken Spring
Indicators" on sides of spring
canisters. See Fig. 3.
NOTE: Bearings and springs
are prelubricated and require no
periodic maintenance.
!
Do not attempt to remove spring from its housing. Clock-
type springs can be dangerous to handle. Removal of
spring from housing could result in personal injury.

SPRING REPLACEMENT

The unique SAFETYCHANGE® spring motor consists of a
spring and hub sealed within a housing. A replacement spring is
supplied sealed in its housing and the old unit should be discarded
completely.
1. Turn off all electric power.
2. Disconnect cable from machine junction box.
3. Relieve all spring tension following steps under SPRING
DETENSIONING on last page.
4. Remove inspection cover from face of spring housing.
5. Rotate spool clockwise and observe spring shaft. Shaft
should rotate clockwise and hub (with spring attached) should
remain stationary.
NOTE: Do not attempt to remove spring if resistance is
met or hub tends to rotate with shaft.
Continue to rotate spool and strike end of shaft several sharp
blows with a lead hammer or rubber mallet until shaft rotates
freely and hub remains stationary.
6. Remove (4) nuts which secure spring motor(s) to frame.
7. Slide spring motor(s) off shaft and discard.
NOTE: On multi-spring reels, be sure to remove and save
dowel pins which connect one spring hub with another. Also
remove snap rings on shaft between spring housings.
8. Install replacement spring motor(s), pawls and pawl springs.
NOTE: Pawl springs must be located between the pawls
and the deepest section of the shaft grooves. Make sure that
pawls and pawl springs are inserted flush with ends of shaft and
hub or they may rub against inspection cover.
SPOOL
SHAFT
SIDE VIEW
9. Tighten nuts (and extension bolts) securing spring
housing(s) to reel frame.
10. Connect free end of cable to junction box or adjust cord stop.
11. Retighten nut on spring detensioner. See SPRING
DETENSIONING, back page.
12. Tension spring with spanner wrench. Refer to
INSTALLATION section
13. Replace inspection cover and top gear access cover.
"IN" with 2/3
BROKEN SPRING
cable off reel–
INDICATORS
SPRING OK
"OUT" with 2/3
cable off reel–
SPRING
BROKEN
Figure 3
WARNING
PAWL
(Spring not
SPRING
SHAFT
Install
GROOVE
END VIEW
against flat
CONTINUED ON BACK PAGE
SPRING
HUB
shown)