Chamberlain 248739 Motor Unit Assembly Parts

Motor Unit Assembly Parts

7

(Down)

Brown Contact Wire

ND

Drive

Gear

Center Limit

Contact

				1
			4	2
				2
				3
			18	7
	19	17	8	5
			15
			9	10
			16	6
			16
			11
			13	14
	LIMIT SWITCH
	ASSEMBLY
		Grey
	UP	Wire
	UP
(Up)				12
(Up)	Yellow
Contact	Yellow
Contact	Wire
	Wire

	KEY	PART		KEY	PART
	NO.	NO.	DESCRIPTION	NO.	NO.	DESCRIPTION
	1	41A4371	Belt cap retainer	12	41A5525-4	Cover
	2	41A4885-5	Gear and sprocket assembly.	13	41A2818	Limit switch drive & retainer
			Complete with: Spring washer,	14	41D3452	Limit switch assembly
			thrust washer, retaining ring,	15	41A2822-1	Interrupter cup
			bearing plate, roll pins (2), drive
				16	41C4398A	RPM sensor assembly
			gear and worm gear, helical gear
				17	41AB050	Receiver logic board
			w/retainer and grease
	3	41A2817	Drive/worm gear kit w/grease,			assembly. Complete with:
						Logic board, end panel w/all
			roll pins (2)
						labels, light socket
	4	41B4245	Line cord
				18	41C5499	High voltage wire harness
	5	41A5484-10	End panels w/all labels
					41C5500	Low voltage wire harness
	6	4A1344	Light socket
				19	41D180-1	End panel w/all labels
	7	108D79	Lens
						NOT SHOWN
	8	30B532	Capacitor - 1/2 HP
					41A2826-1	Motor shaft bearing kit
	9	12A373	Capacitor bracket
					41A2825	Opener assembly hardware
	10	41A3150	Terminal block w/screws
						kit (includes screws not
	11	41A4842	Universal replacement motor &			designated by a number in
			bracket assembly.			illustration)

Complete with: Motor, worm, bracket, bearing assembly, RPM sensor

38

Contents

For Residential Use Only Introduction Assembly Installation Adjustment Operation Preparing your garage door Tools needed SECTIONAL DOOR INSTALLATION Planning (Continued) Carton Inventory Hardware Inventory Assemble the Rail & Install the Trolley Fasten the Rail to the Motor Unit Install the Idler Pulley Install the Belt and Attach the Belt Cap Retainer Set the Tension Determine the Header Bracket Location Install the Header Bracket Attach the Rail to the Header Bracket Position the Opener Hang the Opener Install the Door Control Install the Lights Attach the Emergency Release Rope and Handle Electrical Requirements Install The Protector System® INSTALLING THE BRACKETS Garage door track installation (preferred): Wall installation (Figure 2 & 3): Floor installation (Figure 4): MOUNTING AND WIRING THE SAFETY REVERSING SENSORS ALIGNING THE SAFETY REVERSING SENSORS TROUBLESHOOTING THE SAFETY REVERSING SENSORS Fasten the Door Bracket ONE-PIECEDOORS Metal Doors: Connect Door Arm to Trolley ALL ONE-PIECEDOORS 1.Assemble the door arm, Figure 4: 2.Adjustment procedures, Figure 5: •Open door adjustment: decrease UP travel limit •Closed door adjustment: decrease DOWN travel limit Adjust the UP and DOWN Travel Limits Adjust the Force Test the Safety Reversal System Test The Protector System® Using Your Garage Door Opener Using the Wall-MountedDoor Control To Open the Door Manually CARE OF YOUR OPENER LIMIT AND FORCE ADJUSTMENTS: Repeat the safety reverse test (Adjustment Step 3, page 29) after any adjustment of limits or force MAINTENANCE SCHEDULE HAVING A PROBLEM 1. My door will not close and the light bulbs blink on my motor unit: 2. My remotes will not activate the door: 3. My door reverses for no apparent reason: Repeat 1 FLASH 2 FLASHES 3 FLASHES 4 FLASHES 5 FLASHES To Add or Reprogram a Hand-heldRemote Control To Erase All Codes From Motor Unit Memory *3-ButtonRemotes To Add, Reprogram or Change a Keyless Entry PIN Rail Assembly Parts Installation Parts Motor Unit Assembly Parts ACCESSORIES 950D 1-ButtonSECURITY✚® Remote Control: 953D CHAMBERLAIN® ONE-YEARLIMITED WARRANTY, 10 YEAR BELT LIMITED WARRANTY AND LIFETIME MOTOR LIMITED WARRANTY