32DF9T02.B
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TABLE 3-1: WHEELCHAIR AND STANDEE LIFT TROUBLESHOOTING CHART
SYMPTOM PROBABLE CAUSE TESTS AND CHECKS CORRECTIVE ACTION
Controller
failure.
Check for 24 vdc at pin 18 of P2 with
Down button pressed.
If voltage is present, replace control-
ler.
Debris in hydraulic
system.
Open manual release valve. If platform lowers with valve open,
flush hydraulic system.
Hydraulic quick-
disconnect hose fitting
to cylinder is loose.
Verify that quick-disconnect connector
is fully engaged.
If loose, remake connection.
Debris in flow control
valve (located at cylin-
der).
Open manual release valve. If platform lowers with valve open,
flush hydraulic system.
CAUTION
Verify that 24 vdc power to lift is OFF before opening this hydraulic line. Support platform if deployed.
Platform
does not
lower
manually.
Manual pressure
release valve failure.
Loosen fitting on the hydraulic line
connected to pump assembly.
If platform lowers, replace release
valve.
Obstruction of rollstop
release latch.
Raise platform and actuate latch
manually.
If latch does not move, remove left
rollstop cover (Fig 3-3 in chapter 4)
and inspect for debris.
Rollstop “Ground Con-
tact” switch not actuat-
ing.
Check for 24 vdc at pin 14 of P5 with
platform on ground.
Verify adjustment; readjust as neces-
sary (section C.1.b of chapter 4).
Connector P6 for roll-
stop switches is loose.
Check for 24 vdc at pin 1 of J6. Verify secure connection of P6 to J6.
Connectors are behind right rollstop
cover (Fig 3-3 in chapter 4).
Connector for rollstop
motor is loose.
Check for 24 vdc between pins A and
B of J7.
Verify secure connection of P7 to J7.
Connector is behind right rollstop
cover (Fig 3-3 in chapter 4).
Rollstop “Ground Con-
tact” switch failure.
Check for 24 vdc at pin 14 of P5 with
platform on ground.
If voltage is not present, replace
switch (section F-1 of chap 4).
Rollstop motor failure. Check for 24 vdc between pins A and
B of J7.
If voltage is present, replace rollstop
motor. Refer to Fig 3-4 in chapter 4.
Main harness
connector on controller
module is loose.
Check for 24 vdc at pin 2 of P5. Verify secure connection of P2 to
controller.
Carriage-platform har-
ness connector on con-
troller is loose.
Check for 24 vdc at pin 2 of P5. Verify secure connection of P5 to
controller.
Rollstop adjustable link
is misadjusted.
Look for a gap between the closed roll-
stop and the bumper it contacts.
If any gap is seen, verify adjustment
(Fig 3-6 in chapter 4).
Rollstop
doesn’t open
when plat-
form con-
tacts ground.
Connector for rollstop
switches is loose.
Check for 24V at pin 5 of J6. Verify secure connection of P6 and
J6 (connector is behind left rollstop
cover (Fig 3-3 in chapter 4).
Hydraulic manual
release valve is open.
Look for fluid returning to pump reser-
voir.
Close manual release valve; do not
over-tighten.
Platform
rises, but
then lowers
when “Up”
button is re-
leased.
Down valve is
actuated.
Check for 24 vdc at terminal 4 on TS1
(located in pump enclosure).
If voltage is present, replace control-
ler.
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