Does machine raise/
lower?
Does pump operate?
Check for power connection. See Main Troubleshooting
Replace pump assembly
No
Ascent speed slow or
erratic?
Is emergency down
valve open?
Close emergency down
valve or cable connections
Is hydraulic fluid low
With platform lowere
pump reservoir to 1" b
top of reservoir
Yes
No
Is battery fully charged?
Is emergency down
valve open?
Are any structural
members bent?
Contact manufacturer to
arrange replacement.
Is t
Rep
Charge battery.
Close emergency down
valve.
Yes, but
not properly
Is power solenoid
damaged?
Replace
solenoid.
Are diodes functioning
properly?
Measure resistance across diode—Ohm meter/multi-meter at 40 k
ȍ
se
Will not descend?
Creeps down?
Has key switch been
turned off?
Is an E-Stop activated?
Is battery charged?
Turn key to on position.
Pull out emergency stop button
at upper and lower controls.
Charge batteries.
Is emergency down
valve open?
Close emergency down valve.
Check cable connections.
Disassemble and clean. Look for residue in
screen and on O-ring or damage to O-ring.
Replace down valve.
Faulty down
valve?
Electrical
problem?
Foreign matter
lodged in up or
down valve?
Disconnect coil. Check if unit stop
drifting. Check voltage at coil—sho
be 0 V when not energized.
Run unit up and t
Might be able to re
walls inside cylinde
Starts elevating,
then stops?
Are pothole guards
blocked?
Is pothole limit switch
functionning?
Remove
obstruction.
Replace limit
switch or repair
connections.
Part #SUPO-613
REV E
Page 30 of 38
Is down valve stuck
open?
uid low?
owered, fill
to 1" below
ervoir
Flush valve by simultaneously
pressing up switch at base and down
switch on platform control for 30 sec.
Contact CEI for further
troubleshooting.
Check integrity of electrical
connections, There may be a
loose connection or momentary
short.
Flush down valve by
simultaneously pressing up switch
at base and down switch on
platform control for 30 sec.
There may be foreign matter
lodged.
Is there a restriction in
hydraulic hose?
Replace pump. May
be worn or defective.
Replace hydraulic hose.
Is up/down switch
damaged?
Replace rocker switch at
upper or lower control.
k
ȍ
setting. With black lad on stripe side and red on other side, should get a resistance reading. Switch leads, no reading.
Replace bad diode.
SUPO-613 HB-830 Troubleshooting Flowchart
Elevate & Lower Problems
Revision A: Initial Release
08/02/2010
Replace down coil.
Check for loose electrical
connections.
it stops
—should
ed.
Damaged cylinder or
damaged seal in
cylinder?
Coil mounting nut too
tight?
and then check for oil flow out of return line. Bad cylinder
seal if oil is flowing from return line.
to repair with seal kit;, probably need to replace cylinder. If
ylinder are scratched or pitted, cylinder needs replacement.
Nut should only be lightly snug:
30 in.-lb. Replace coil and lightly
tighten nut.
Faulty check valve in
pump?
Listen carefully near motor when
not energized—may be running
backwards. Replace pump
Part #SUPO-613
REV E
Page 31 of 38
