BY CUSTOM EQUIPMENT LLC
BY CUSTOM EQUIPMENT LLC
28
29
MAINTENANCE & TROUBLESHOOTING
HB-P3.6
SUPO-726
REV A
MAINTENANCE & TROUBLESHOOTING
HB-P3.6
SUPO-726
REV A
6.3 | TROUBLESHOOTING FLOWCHART: LOWERING
Troubleshooting Step 2B: Lowering
Rev. B
Does machine
lower?
Not
at all
Descent speed slow or
erratic?
Are any structural
members bent?
Contact manufacturer to
arrange replacement.
Is there a
restriction in
hydraulic hose?
Yes
Yes
Does the up/
down switch
appear
damaged?
Yes
Creeps down? Or
Goes up and Comes
Back Down?
Has master power
switch been turned
off?
Is E-Stop
activated?
Is battery
charged?
Is emergency
down valve
open?
Yes
Faulty down
valve?
Electrical problem?
Disconnect coil.
Check if unit stops drifting.
Check voltage at coil
—
should be
0 V when not energized.
Foreign matter
lodged in up or
down valve?
Damaged cylinder or
damaged seal in cylinder?
Run unit up and then check for
oil flow out of return line. Bad
cylinder seal if oil is flowing
from return line.
Down Valve Coil
mounting nut too tight?
Nut should only be lightly
snug: 30 in.-lb.
No
Yes
Faulty check valve
in pump?
Listen carefully near motor
when not energized
—
may be
running backwards
Yes
Starts descending,
then stops?
Are maintenance lock
pins in place?
Yes
No
Does the overload
Limit switch
appear damaged?
Will Manual
Override lower
the platform?
Turn key
to
ON position.
No
No
No
Level of skill with
hydraulic maintenance?
Not experienced
with hydraulics
Check manual override cable, lever, and fastening points
Yes
Yes
Yes
t
See also
Wiring Diagram WD-143-20-001-51
or
Schematic: WS-143-20-001-51
And
Hydraulic Schematic HS-HB-P3.6
Or
Pictorial Hydraulic Circuit HSP-HB-P3.6
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 pins are in place.
Yes, but
not properly
No
No
Check wiring connections in lowering
components.
See Electrical Schematic
WS-143-20-001-51
Or
Pictorial Schematic
WSP-143-20-001-51
And instruction
Circuit Check-HB-P3.6-Elevate
WARNING:
Double check that
maintenance pins are in place
Yes
Yes
No
Yes
Charge battery.
See
SD-Battery-01
Yes
No
No
OK
No
Yes
Level of skill
with hydraulic
maintenance?
Check Hydraulic
Circuit. (Additional
tools required,
higher level of skill
required)
Refer to
Hydraulic
Schematic HS-HB-
P3.6
Are power
connections to
lowering circuit and
switches functioning
properly?
Replace or repair
identified problem.
See
Parts List
.
Contact
Hy-Brid
Lifts
Does the
armguard Limit
switch appear
damaged?
No
Yes
No
No
No
Experienced with
Hydraulic systems
Experienced
With hydraulic
systems
Not experienced
With hydraulics
Yes
Yes
No
Close
emergency
down valve.
Check cable
connections.
Replace
hydraulic hose
Disassemble and clean.
Look for residue in screen
and on O-ring or damage
to O-ring.
Replace coil
and lightly
tighten nut.
No
Y es or Don’t know
Replace
down valve.
Might be able to repair with seal
kit;, probably need to replace
cylinder. If walls inside cylinder
are scratched or pitted, cylinder
needs replacement.
Yes
Replace
pump.
Replace
down
valve
No
No
Reference Revision B
Pull out
emergency
stop button at
upper controls.
Replace switch
at upper
control.
Replace
limit switch
Replace
limit switch
Stow
ML Pins
Flush down valve by
simultaneously pressing up
switch and pulling e-down
cable control for 30 sec.
SECTION 6 | TROUBLESHOOTING FLOWCHARTS
SECTION 6 | TROUBLESHOOTING FLOWCHARTS
