With a tape measure count from left to right 10 or 20 coils to find your spring size.

Then measure the inside diameter or ID.

Then measure the length.

 Be sure of these measurements before ordering.



THESE SPRINGS ARE VERY DANGEROUS AND CAN CAUSE INJURY OR EVEN DEATH

WE RECOMMEND HAVING THEM INSTALLED BY A PROFESSIONAL IN THE GARAGE DOOR TRADE

BY PURCHASING THESE SPRINGS FROM US YOU AGREE TO RELIEVE OUR SELVES OF ANY AND ALL RESPONSIBILITY AND OR LIABILITIES IF YOU ATTEMPT TO CHANGE SPRINGS WITH OUT THE ASSISTANCE OF A PROFESSIONAL.

The 41C4220A Gear and Sprocket Assembly is the preferred way to "refurbish" your garage door opener as it quickly replaces all of the common wear parts in the opener drive system.  This kit includes all of the 41A2817 Drive / Worm Gear kit, and is easier to install because you do not have to disassemble the output shaft assembly - the spur gear is already mounted on the new output shaft.  The 41C4220A assembly also includes the worm gear, and a new bushing under the sprocket which is another common wear item.  Fits most chain drive openers manufactured since 1984 by: Liftmaster, Chamberlain, Sears Craftsman, Master Mechanic.  Replaces part 41A2827.  Gears are not available for openers manufactured prior to 1984.  Instructions are included in the package.

Fits these Liftmaster Models: 985, 1240, 1240R, 1245, 1245R, 1245LK, 1250, 1255, 1255R, 1260, 1260LK, 1265, 215WD, 220WD, 315WD, 320WD, 1345, 2245, 2255, 2265, 2565, 3245, 3255, 3265.  Do not use for openers with dual sprockets on the output shaft.

Fits these Chamberlain Models:  1100, 1200, 2100, 2200, 4100, 4200, CG40, CG40D, CG42D, PD100, PD200, PD210, PD210D, PD212, PD212D, PD600, PD610, PD610D, PD612KLD, PD612K, 5100, 6200, 7200, 7220, 7320, 7420, 7520D, 4893OD, HD200D.    Do not use for openers with dual sprockets on the output shaft.

Note:  Also fits openers labeled under various names such as: Sears Craftsman, True Value, Master Mechanic, and some units from Wayne Dalton.  Liftmaster also "private labeled" openers for regional suppliers and dealers - usually it is very easy to see that it is a Liftmaster opener with a different name on the cover.  Compare your parts to the picture above.  The Large Gear is 2 3/4" x 1/2" wide, with a 1/2" bore.  The worm gear is 1 1/8" OD, and the teeth are 1 1/4" wide (all sizes are approximate).



This drive gear replacement kit 41A2817 is for all Liftmaster, Sears, Chamberlain chain and belt drive openers manufactured from 1984 to the present. Also used for Wayne Dalton opener models 100 - 320. This is the manufacturer original equipment replacement part for the following garage door openers: Lift-Master, Sears Craftsman, Chamberlain, Master Mechanic, Garage Master.

All 1/3 Hp, 1/2 Hp, 3/4 Hp Chain and belt drive garage door openers manufactured from 1984 to the present for these manufacturers:

• Lift-Master
• Sears Craftsman
• Chamberlain
• Master Mechanic
• Garage Master
• Wayne Dalton models 100-320

Includes:

Main drive gear
Worm gear
Replacement bushing, fittings, & pins
Lubricant
Instructions

• Powerful 24V DC motor provides ultra-quiet operation, along with variable speed smooth start and smooth stop
• Easy wall-mount installation means no rails to hang
• Auto-force feature constantly monitors garage door system and adjusts forces to temperature fluctuations, floor height, and door track movement
• The Smart Garage Door Opener® lets you electronically program security codes from the Smart Control Panel® or the powerhead
• Enclosed gear case provides continuous lubrication and protection for longer life and smoother operation
• A 6-foot power cord makes connecting to a power source easier than ever
• New optional Alternate Power Source (580LM) is a safe, permanent option to power the 3800 when an outlet is not within 6 feet; UL approved
• Remote light delivers 200 watts of light with adjustable light time delay
• Meets all UL325 requirements

SAFETY & SECURITY FEATURES

• The Protector System® safety sensors project an invisible light beam across the garage door opening and automatically reverse the door if anything interrupts the beam while the door is going down
• Sensing technology will stop the door from closing if contact is made with a person or object
• Opener light turns on automatically when The Protector System's infrared beam is broken
• Security+® rolling code technology assures a new code is sent every time the remote control is used
• Manual release handle in case of power failure

WARRANTY

• Lifetime motor warranty 
• 5-year parts warranty