Poweramp CentraAir AIR POWERED - Manual (Page 14)

12
4111-0034 —July 2012
Aug 2012
NOTE: Poweramp
®
dock levelers are designed with a
nominal 1/2 in. (12.7 mm) shimming distance
to allow for pit inconsistencies.
1. Determine height of shim stack (L) for each shim
location (B) by performing the following:
a. Measure leveler frame height distance (A).
b. Measure dock floor-to-pit floor distance (J)
at each shim location (B). Write down the
dimensions obtained at each location.
c. Subtract distance (A) from distance (J) to obtain
the shim height. Repeat for each shim location.
5. Using an appropriate lifting device connected to the
lifting brackets, lower dock leveler into the pit so
rear hinge frame angle (H) is tight against rear pit
curb angle (F) across full width of the leveler frame.
6. Allow rear of dock leveler to rest on the rear shims
while keeping the front of the dock leveler level with
the dock floor.
7. For all CA models, add shims at front shim
locations (C and D) so front of dock leveler will stay
level with dock floor when leveler is resting fully on
shims.
4. For all CentraAir® models, put a 1/4 in. (6.6 mm)
thick shim at locations (C and D) .
NOTE: A 1/4 in. (6.6 mm) thick shim at locations (C
and D) is used only as a starting point. The
final shim stack height will be determined after
dock leveler is lowered into the pit.
2. Using the results obtained in step 1, create the
individual shim stacks on the pit floor at locations
(B). Build each shim stack (L) using the pyramid
method (N) (preferred) or stepped method (P) with
the top shim having a minimum size of 4-1/2 x 4-1/2
in. (114.3 x 114.3 mm) and each successive lower
shim being larger so the shims can be welded
together using a fillet weld. DO NOT use offset
method (Q) or straight method (R).
NOTE: To assist in obtaining an accurate measurement
of distance (K), use a string (G) pulled tight
across the pit opening, directly over the shim
locations.
3. Verify that each shim stack is at the correct height
by measuring distance (K) [top of shim stack (L)
to dock floor]. Distance (K) must equal the dock
leveler height (A).
INSTALLATION
The dock leveler is heavy. Use chains and a
lifting device with the appropriate lifting capacity
and reach. Failure to do so may result in damage
to dock leveler and/or serious personal injury or
death.
IMPORTANT
The minimum size of the shim that contacts the
leveler frame (i.e., the top shim of each shim stack)
must be at least 4-1/2 x 4-1/2 in. (114.3 x 114.3 mm)
to support the full width of the hoist cylinder / storage
prop weldment.
Use the thickest shim stock possible for stability and
weld penetration purposes. DO NOT use multiple
layers of 1/8 in. (3.18 mm) or thinner shim stock.