LiftMaster 8550W 8550W Owners Manual - Page 8

Tighten the Belt

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Assembly 2 Tighten the Belt 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. 2. Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmly against the trolley. 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. 1 (To motor unit) Spring Trolley Nut 2 Nut ring slot 3 Nut Ring BEFORE 1" (2.5 cm) Nut Ring AFTER RELEASE 1-1/4" (3.18 cm) 8

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8
Assembly
2 Tighten the Belt
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.
2.
Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmly
against the trolley.
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.
Spring Trolley Nut
(To motor unit)
Nut ring
slot
Nut Ring
Nut Ring
AFTER RELEASE
1-1/4"
(3.18 cm)
BEFORE
1"
(2.5 cm)
1
2
3