Upright TL33 - 5.1 Troubleshooting

5-2
TL33 Work Platform
Troubleshooting
Section
5.1
TROUBLE
PROBABLE CAUSE REMEDY
All functions
inoperable, electric
motor does not
start.
1. Blown electric
motor fuse FU2.
2. Faulty battery
charger.
3. Faulty battery(ies).
4. Loose or broken
battery lead.
5. Emergency Stop
switch(es) upper &
lower failed open.
6. Blown control fuse
FU1.
Check 160 amp electric
motor fuse. Replace if
blown.
Check the voltage
output of the battery
charger. If less than 24
VDC, repair or replace.
After completely
charging batteries, test
each battery. Replace
as required.
Check continuity of all
battery and motor leads.
Replace if necessary.
With emergency stop
switch in the ON
position, check
continuity across
contacts. If none,
replace.
Check 7A circuit control
fuse. Replace if blown.
All functions
inoperable. Electric
motor starts when
control is actuated.
1. Oil level in
hydraulic
reservoir is low.
2. Faulty hydraulic
pump.
3. Fautly Controller
Check hydraulic fluid
level, top off as required.
Check pressure and
delivery of the hydraulic
pump. Replace if
required.
Check operation.
Replace if required.
Platform will not
elevate or elevates
slowly.
1. Emergency
Lowering valve
open.
2. Platform
overloaded.
3. Faulty controller at
upper controls.
4. Blown control fuse
FU1.
5. Battery Voltage
low.
Check LED on
motor control unit
for 7 flash fault
(LED will flash 7
times) due to
battery voltage
<14V.
Close emergency
down valve.
Observe maximum load
rating. (See Table 1-1)
Check functionality of
controller. Replace if
faulty.
Check 7A circuit
contrrol fuse. Replace if
blown.
Check Battery Voltage.
Charge if necessary.
TROUBLE
PROBABLE CAUSE REMEDY
Platform will not
elevate or elevates
slowly.
6. Check LED on
motor control unit
for 8 flash fault
(LED will flash 8
times) due to
thermal cutback.
8. Outrigger limit
switches LS1,
LS2, LS3, LS4 not
activated.
9. Faulty lift valve
solenoid.
Allow unit to cool down,
to clear flashing.
Ensure all four
outriggers are deployed
and the
limit switch contacts
are closed.
Replace switch.
Test Lift Solenoid, if
proper voltage is
present and coil is not
magnetized - Replace.
Booms drift down
after being elevated
1. Emergency
lowering valve
open.
2. Leaking piston
seals in lift
cylinders (CYL1,
CYL2)
3. Overcentre valve
leaking internally.
Ensure that emergency
lowering valve is
completely closed.
Replace the valve.
Check for leakage at
cylinder return line,
replace seals if
necessary.
Check for
contamination and
clean. Check that
O-Rings are intact.
Machine will not
slew when booms
are elevated
1. Faulty slew cut-out
limit switch.
2. Faulty slew switch
or controller
3. Faulty slew
solenoid.
4. Mechanical
Damage
5. Slew Valves stuck.
6. Key on Slew Motor
shaft sheared off.
Check that Normally
Closed contacts of limit
switch are closed when
second post is
approximately 1m
above ground.
Adjust switch lever arm
or Replace switch.
Test switch for
continuity. Replace if
defective.
Test Slew Solenoid, if
proper voltage is
present and coil is not
magnetized - Replace.
Inspect all slewing
components. Replace
damaged parts.
Inspect slew valves. If
spool is sticking -
Replace.
Remove motor from
gearbox and replace
key if sheared.
Table 5-1: Troubleshooting