Chamberlain Merlin MJ3800R Installation And Operating Instructions Manual page 9

INSTALLATION STEP 2 (CONTINUED)
5. Loosely attach the two remaining drive spacers to the sprocket as shown in figure 5, using M8 x16 bolts and
spring washers. The slots should correspond in the base plate to achieve desired distance between sprocket and
base plate, see figure 5. Ensure correct fit and spacing of all drive spacers, then firmly tighten all loose
connections. This completes installation of the Chamberlain Easy Fit Sprocket Kit (Pat. pend.).
figure 5
CHAIN AND SPROCKET LINKAGE
Fit and align the stub sprocket to the unit and install the drive chain. The drive chain
should be tensioned using the weight of the motor unit to remove slack. Do not force
the opener downward to tension the chain.
Install the stub sprocket
at a suitable position
9
Use weight of opener to tension
chain, then tighten mounting
bolts. Do not force the opener
downward.