Harken 7801 4-Point Storage System - 60 lb - Manual (Page 12)

12
DIAGRAM 14. Center object under mounting points.
Position mounting boards so lifted object is balanced.
STEP 1 CONTINUED: DETERMINE HOISTER LOCATION; RAFTERS RUNNING SIDEWAYS
WARNING! Do not screw into laminated rafters.
They are not intended to accept fasteners. Consult
rafter maker for recommendations. Screwing into
laminated rafters may considerably weaken system,
causing load to fall and cause an accident.
Garage
door
Front
wall
2
3
1
Ceiling
B. PLAN LOCATION OF MOUNTING BOARDS
Mounting boards are used to position Hoister
directly above object to be lifted.
7806 Hoister (200 lb/91 kg system) requires
mounting boards to span minimum three rafters.
Note: Mounting boards may not be necessary for
installation in ceiling with exposed rafters. In ceilings
with exposed rafters, system can be installed on
rafters. Position Hoister directly above object to
be lifted. If installing without mounting boards,
go to Step 3 (page 13).
Plan location of mounting boards and welded screw eye.
STEP 1B
1) Length of mounting boards.
________________________
(calculation above)
STEP 5A
2) Measurement from
center of 2" X 4" to
front wall. __________
3) Measurement from
2" X 4" to lowest drop point.
____________
If measurement 2 is less than
measurement 3, refer to step
5A Diagram 21 (page 15).
DIAGRAM 15. Check to make sure 2" x 6" boards are long enough.
Distance of 2" X 4" from front wall is important, as it affects the position of the welded screw eye in Step 5A (page 15).
2" x 4"
LOCATE CEILING MOUNTING BOARD POSITION
+ 8" (200 mm)
Tip: The distance does not have to be exactly 35%.
Greater distance is okay and distance for long canoes
and sea kayaks can be less as stated above.
LENGTH OF 2" X 6" MOUNTING BOARDS
Length of mounting boards should be at least
35% of the object's length.
Exception: Length of mounting boards for long, lightweight
canoes/sea kayaks will be less than 35% of the object’s length.
Calculate length of mounting boards using formula or chart below.
_________________ x .35 = ______________________
Object length 35% Length of mounting board