Poweramp CHALLENGER HYDRAULIC 11_96 - Manual (Page 19)

TROUBLESHOOTING GUIDE
18
DOCK LEVELER (Continued)
Problem Cause(s) Solution(s)
CONTINUED 2. Pressure relief valve set too
low. 2. See Item #1 of adjustment and testing, page 8. NOTE:
The valve set point should NOT be set at a level that will
cause the motor operating current to exceed its full load
amp value at any time, including when the unit is operating
in pressure relief.
3 Damaged or blocked
hydraulic hose(s). 3. Replace damaged hose(s). Remove blockage from
hose(s).
Leveler platform does not raise
to its full height OR platform
raises to full height but lip does
not fully extend OR motor
overcurrent device and/or
overload device continuously
tripping. 1. Low hydraulic fluid. 1. Add fluid. See Preventive Maintenance section, page
14.
While leveler is descending, it
locks into "safety". Lip drops
to vertical position. 1. Platform down-speed is too
fast. 1. Slow speed as follows: Loosen jam nut in radius of
fluid logic block. Using 1/8" Allen wrench, turn Allen
screw CW approximately one full turn; tighten jam nut.
Check down-speed. If leveler still descends too rapidly,
repeat above. If leveler descends TOO SLOWLY repeat
above, BUT turn Allen screw CCW.
Platform reaches full height, but
lip does not automatically
extend when the pushbutton is
pressed. 1. Weight on operating arm
cable has slipped down on
cable. 1. Loosen setscrews on operating cable weight. DO NOT
LOSE steel ball under each screw. Raise weight 1/2" to
3/4" and secure screws. If spring is worn, replace.
Lip extends almost immediately
when the pushbutton is
pressed. Platform will raise
after lip extends. 1. Spool extending through top
of logic block stuck ON or
operating arm binding causing
arm to prematurely press
down on and activate spool. 1. Free-up operating arm. If necessary, detach arm from
logic block. Spray WD-40 penetrating oil or equivalent
over top of logic block. Work spool to free-up spool.
Replace spool if arm not contacting spool and problem
persists.
Lip does not extend. 1. Spool extending through top
of logic block stuck OFF or,
operating arm binding so that
arm will not press down on
and activate spool. 1. Free-up operating arm and spool. If necessary, detach
arm from logic block. Spray WD-40 penetraing oil or
equivalent over top of logic block. Work spool to free-up
spool.
Units with auto return to dock
only. Leveler will not
automatically return to cross
traffic position. 1. Auto return proximity switch
that senses when leveler lip at
below dock target and/or
switch out of adjustment. 1. Locate switch. Adjust switch and/or target so that
target is in sensing range of switch when unit is at below
dock. See Page 11.