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Hubbell Gear Drive Electric Cable Reels SM21 User Manual

Installation and maintenance instructions, Sm21 gear drive electric cable reels

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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.

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. If model number includes an

"R", reel is reverse rotation and wrench must be rotated

counterclockwise. (See EXPLANATION on parts list page.)

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.

Do not attempt to relieve spring tension using spanner

wrench. Doing so may result in personal injury.

WARNING

CONTINUED ON BACK PAGE

INSTALLATION and MAINTENANCE INSTRUCTIONS

SM21 GEAR DRIVE ELECTRIC CABLE REELS

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.

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.

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.

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.

WARNING

BROKEN SPRING

INDICATORS

“IN” with 2/3

cable off reel–

SPRING OK

“OUT” with 2/3

cable off reel–

SPRING

BROKEN

Figure 3

PAWL

SIDE VIEW

END VIEW

SPRING

Install

against flat

SPRING

HUB

(Spring not

shown)

SHAFT

GROOVE

SPOOL

SHAFT

Do not exceed number of turns indicated on

serial plate. Over-tensioning can cause a

broken spring, sheared shaft or other damage.

CAUTION

For reels manufactured after April 16, 2001

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