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Door Sprockets (JDC/RJDC/JHDC Only)
NOTE: The latest Installation Manual can be found at liftmaster.com.
NOTE: JDC, RJDC and JHDC 700 / 1200 models come with a 12-tooth drive sprocket pre-installed. JHDC 2200 models
come with a 10-tooth drive sprocket pre-installed. 10-tooth sprocket kit is available to convert 12-tooth operators in
the field (Part # 71-1550B10LGH). Reducing drive sprocket size will reduce door speed, or allow for using a smaller door
sprocket at same door speed.
Example: Door Sprocket Reduction (Keeping door speed the same)
Door Type
Sectional
Rolling Steel
Sectional Door Sprocket Recommendations for 12-Tooth (700/1200) & 10-Tooth (2200)
Operator Sprockets
Drum
Diameter
Sprocket
Tooth Count
4"
16
5.25" to
5.75"
& 8.5"
24
Vertical
Lift
6.375" to
32
11"
13.5
42
Rolling Door Sprocket Recommendations for 12-Tooth Operator Sprocket (700/1200)
Uninsulated Rolling Door - Max 20ft Height - 8-9 in/s
Operator
Door Weight
Series
up to 450 lbs
700
450 to 700 lbs
700 to 1200 lbs
1200
1200 to 1800 lbs
12-Tooth Drive Sprocket
42-Tooth
60-Tooth
Recommended Door Sprocket for Desired Speed
For 10-12 in/sec
1 in. Bore,
1.25 in. Bore,
1/4 in. Keyway
1/4 in. Keyway
71-1550B16LGH
71-1550B16QGH
71-1550B24LGH
71-1550B24QGH
71-1550B32LGH
71-1550B32QGH
71-1550B42LGH
71-1550B42QGH
Sprocket Tooth Count
50
72
Sprocket
1 in. Bore,
Tooth
1/4 in. Keyway
Count
24
71-1550B24LGH
32
71-1550B32LGH
42
71-1550B42LGH
56
71-1550B56LGH
Insulated Rolling Door - Max 20ft Height - 8-9 in/s
Operator
Door Weight
Series
700
up to 450 lbs
1200
450 to 900 lbs
4
10-Tooth Drive Sprocket
32-Tooth
50-Tooth
For 9-10 in/sec
1.25 in. Bore,
1/4 in. Keyway
71-1550B24QGH
71-1550B32QGH
71-1550B42QGH
71-1550B56QGH
Sprocket Tooth
Count
60
72
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