Troubleshooting - Urrea EHT10 Manual De Usuario

expensive property damage, lost production
time, serious personal injury or even death.
• Check safety lock audibly and visually while
in operation.
• Check safety latches for free movement and
full engagement with rack.
• Check hydraulic connections and hoses for
leakage.
• Check chain connections for bends, cracks
and looseness
• Check cables connections for bends, cracks
and looseness.
• Check for frayed cables in both raised and
lowered position.
• Check snap rings at each roller and sheave.
• Check bolts, nut and screws. Tighten if
needed.
• Check wiring and switches for damage.
• Keep base plate free of dirt, grease or any
other corrosive substances.
• Check floor for stress cracks near anchor bolts.
• Check swing arm restraints.
WEEKLY MAINTENANCE (40 HOURS)
• Check anchor bolts torque to 130 ft-Ibs for
the 3/4 anchor bolts.
• Do not use impact wrench.
• Check floor for stress cracks near anchor
bolts.
• Check hydraulic oil level.
• Check and tighten bolts, nuts and screws.
• Check cylinder pulley assembly for free move-
ment or excessive wear on cylinder yoke or pul-
ley pin.
• Check cable pulley for free movement and
excessive wear.
YEARLY MAINTENANCE
• Lubricate chain.
• Grease rub blocks and column surface con-
tacting rub blocks.
• Change the hydraulic fluid. Good mainte-
nance procedure makes it mandatory to keep
hydraulic fluid clean. Due to operating tem-
perature, type of service, contamination levels,
filtration and chemical composition of fluid,
the hydraulic fluid may need to be changed
more or less frequently. If operating in dusty
environment, shorter interval may be required.
The following items should only be performed
18
by a trained maintenance expert:
• Replace hydraulic hoses.
• Replace chains and rollers.
• Replace cables and sheaves.
• Replace or rebuild air and hydraulic cylinders
as required.
• Replace or rebuild pumpslmotors as required.
• Check hydraulic and air cylinder rod and rod
end threads for deformation or damage
•Check cylinder mount for looseness and dam-
age.
Relocating or changing components may cause
problems. Each component in the system must
be compatible; an undersized or restricted line
will cause a drop in pressure. All valve, pump
and hose connections should be sealed and/or
capped until just prior to use. Air hoses can be
used to clean fittings and other components.
However, the air supply must be filtered and
dry to prevent contamination.
NOTE: Contamination is the most frequent
cause of malfunction on hydraulic equipment.

TROUBLESHOOTING

MOTOR DOSE NOT RUN
Breaker or fuse is blown.
Motor thermal overload tripped. Wait for
ovcrload to cool
Faulty wiring connections. Call electrician
Defective up button. Call electrician for check-
ing.
MOTOR RUNS BUT WILL NOT RAISE
A piece of trash is under check valve. Push the
handle down and the up button at the same
time. Hold for 10-15 seconds. This should flush
the system.
Check the clearance between the plunger
valve of the lowering handle. There should be
1/16 clearance.
Remove the check valve cover and clean ball
and seal.
Oil level should be just under the vent cap port
when the lift is down.
OIL BLOWS OUT BREATHER OF POWER UNIT
Oil reservoir over filled.
Lift lowered too quickly while under a heavy
load.
Return tube is loose or disconnected.