LiftMaster 8557 8557 Manual - Page 5

Tighten the Belt, By hand

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2 Tighten the Belt 2.1 By hand, thread the spring trolley nut on the threaded shaft until it is finger tight against 2.2 Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmly against the trolley. the trolley. Do not use any tools. (To motor unit) Spring Trolley Nut Nut ring slot 2.3 Tighten the spring trolley nut with an adjustable wrench or a 7/16" open end wrench about a quarter turn until the spring releases and snaps the nut ring against the trolley. This sets the spring to optimum belt tension. Nut Ring BEFORE 1" (2.5 cm) Nut Ring AFTER RELEASE 1-1/4" (3.18 cm) 5

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5
2
Tighten the Belt
2.1
By hand, thread the spring trolley nut on the threaded shaft until it is finger tight against
the trolley. Do not use any tools.
Spring Trolley Nut
(To motor unit)
2.2
Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmly against the trolley.
Nut ring
slot
2.3
Tighten the spring trolley nut with an adjustable wrench or a 7/16" open end wrench about a quarter turn until the spring releases and snaps the nut ring against the trolley. This sets the spring to
optimum belttension.
Nut Ring
Nut Ring
AFTER RELEASE
1-1/4"
(3.18 cm)
BEFORE
1"
(2.5 cm)