Hubbell SM-24 User Manual

For reels manufactured after April 16, 2001

INSTALLATION and MAINTENANCE INSTRUCTIONS

SM24 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 takeup. 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.

WARNING

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. If model number includes an

"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.

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.

“IN” with 2/3

cable off reel–

SPRING OK

BROKEN SPRING

INDICATORS

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

“OUT” with 2/3

cable off reel–

SPRING

BROKEN

Figure 3

periodic maintenance.

WARNING

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

PAWL

SPRING

Install

against flat

END VIEW

SPRING

HUB

(Spring not

shown)

SHAFT

GROOVE

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.

CONTINUED ON BACK PAGE

ILLUSTRATED PARTS LIST

SM-24 GEAR DRIVE ELECTRIC CABLE REELS manufactured after April 16, 2001

Always specify SERIAL NUMBER &

TO DETERMINE ROTATION OF REEL

MODEL NUMBER when ordering parts.

STANDARD REVERSE ROTATION ROTATION

Cable is payed out and retracted as shown

when viewing reel from spring motor side.

ELECTRICAL CONNECTIONS

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