Hubbell SM-28 manual SM28 Gear Drive Electric Cable Reels, Maintenance, Installation

For reels manufactured after April 16, 2001

INSTALLATION and MAINTENANCE INSTRUCTIONS

SM28 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.

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.

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.

!WARNING

Do not attempt to relieve spring tension using spanner

wrench. Doing so may result in personal injury.

INSTALLATION

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.

“IN” with 2/3	BROKEN SPRING
cable off reel–	INDICATORS
SPRING OK

“OUT” with 2/3 cable off reel–

SPRING

BROKEN

Figure 3

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.

!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.

	PAWL		SPRING
SPOOL			HUB
SHAFT			(Spring not
			shown)
	SPRING		SHAFT
	Install
SIDE VIEW		END VIEW	GROOVE
	against flat

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