Poweramp VEH SERIES HYDRAULIC - Manual (Page 19)

TROUBLESHOOTING GUIDE
DOCK LEVELER (Continued)
PROBLEM CAUSE(S) SOLUTION(S)
CONTINUED 2. Pressure relief valve
set too low. 2. Locate valve. See Figure 10, page 8. Remove cover nut.
Using Allen wrench, turn Allen screw CW approximately 1/2
turn. Check speed. If leveler continues to operate slowly, repeat
above. 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 13.
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 nub. 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. 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 penetratin goil 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. Operating
arm binding so that arm
will not press down on
and activate spool. 1. Free-up operating arm and apool. 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.
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.