SECTION 4 | TECHNICAL REFERENCES
4.6 | TROUBLESHOOTING FLOWCHART: ELEVATING
Does machine
elevate?
Does the
pump run?
Not At All
Ascent speed
slow or erratic?
Is the
emergency down
valve open?
Is hydraulic
fluid low?
Yes
No
Yes
Contact your dealer or manufacturer
for troubleshooting assistance
Is battery fully
charged?
Are any structural
members bent?
Contact manufacturer to
arrange replacement.
Is there a restriction in
hydraulic hose?
Is up/down
switch
damaged?
Starts ascending,
then stops?
Is platform
overloaded?
Yes
Is Overload
Enable
Limit Switch
damaged?
Can you see
anything obstructing
the components?
Flowchart-IQ LIFT-Elevating
Troubleshooting Step 2A: Elevating
Remove
obstruction
Yes
No
No
Yes
Replace
OL Enable
LS
Yes
Goes up, but
comes down
Time and parts
available?
Replace Pump
Assembly
Does pump operate?
Try replacing
up valve
No
Is there a different problem
(something is leaking, unusually
noisy, etc.)
Yes
Yes
Remove overload. Lower to
stowed position before
continuing use.
Yes
No
No
Yes
Yes
Troubleshooting Flowcharts--General Notes:
Inspect parts for visible damage as they are encountered.
After each step, check if problem has been indentified and/or resolved.
If so, make the recommended fix or see a referenced document.
If not, continue troubleshooting.
If a part has been identified as needing replacement, see the
Parts
Manual
To identify part number to order.
If any wiring or components have been altered from the original
manufacture, problems may not be identifiable.
WARNING
Any modification on this machine without
the express consent of the manufacturer
is prohibited.
WARNING
Failure to comply with safety precautions
may result in damage, injury, or death.
Refer to Maintenance Manual for
complete warnings
See also
Wiring Diagram
or
Electrical Schematic
And
Hydraulic Schematic
Yes
WARNING
: Set up for maintenance safety:
Remove load from platform.
Check for overhead obstructions.
Platform movement may occur.
Never Reach between scissors links or prop up
platform unless maintenance chock is in place.
Check wiring connections in
elevate components.
See
Electrical Schematic
No
No
Yes
No
No
Is proximity sensor or
its actuating parts
damaged?
Level of skill
with hydraulic
maintenance?
See
Lowering
Troubleshooting
Flowchart
No
Yes
No
Are power connections to
elevate circuit and switches
functioning properly?
Check Hydraulic Circuit.
(Additional tools and higher
level of skill required) See
Hydraulic Schematic
No
No
Experienced
with hydraulic
systems
Not experienced
with hydraulics
Yes
Replace
hydraulic
hose.
Charge battery.
Yes
Reference Revision P01
Replace damaged
switch at upper
control.
Replace pump
assembly.
May be worn
or defective.
Is there a
diagnostic flash
code or message?
Flush down valve by
simultaneously pressing
up switch and pulling e-
down cable control for 30
sec.
There may be foreign
matter lodged.
With platform
lowered, fill pump
reservoir with at
least 0.75 liters of
oil.
Use diagnostic
message to
identify problem
Replace or
repair
identified
problem.
See
Parts
Manual.
Yes, but
not properly
Replace
sensor or
parts.
Check e-
down cable
and down
valve.
No
No
Yes
Yes
MAINTENANCE & TROUBLESHOOTING
IQ LIFT
SUPO-759
REV C
28
