Poweramp VH SERIES HYDRAULIC 10.2011 - Manual (Page 29)

27 4111-0002 — Sept 2010
ADJUSTMENTS
Cable Weight Adjustment
If the platform lip does not extend, or extends too
soon, cable weight (F) may need adjustment. The
cable weight is attached to cable (D) and is located
underneath the platform, directly behind logic block
(B).
The factory setting causes the lip to fully extend
when 1 – 3 in. (25.4 – 76.2 mm) of travel is left in the
platform cylinder.
NOTE: To prevent the cable weight from accidentally
falling off the cable when adjusting the
weight, attach a locking pliers or similar
device to the cable just below the cable
weight. If adjustment requires that the weight
be moved down, allow sufficient distance
between pliers and weight before adjusting.
To adjust the cable weight:
a. Loosen (do not remove) set screws (H). If set
screws are removed, balls (G) may fall out.
b. To make lip extend sooner, slide the weight up.
c. To make lip extend later, slide the weight down.
d. Tighten set screws.
Down Speed Control Adjustment
If the dock leveler did not lower, it is possible that
the speed control requires adjustment. The speed
control adjusting screw (A) is a hex screw located in
logic block (B), directly behind the upper front hose
connection.
NOTE: If the platform lowers too fast, the platform
will stop lowering and lock in “safety” mode.
Use 1/4 turn increments when adjusting the
down speed control. Check platform lowering
speed after each adjustment.
To adjust the speed control:
a. Loosen the jam nut.
b. To decrease the lowering speed, turn adjusting
screw (A) clockwise.
c. To increase the lowering speed, turn adjusting
screw (A) counterclockwise.
d. Tighten the jam nut.
NOTE: Extreme cold and/or incorrect fluid may also
cause cylinder to lock. Adjust downspeed to
decrease lowering speed.
A— Speed Control Adjusting
Screw
B— Logic Block
C—Valve Lever
D— Cable
E— Locking Pliers
F— Cable Weight
G—Steel Ball (2 used)
H— Set Screw (2 used)
Adjust Cable Weight and Down Speed Control
B
A
D
F
E
G
H
C