30
BA551501-en
6.5
Troubleshooting
Error
Cause
Remedy
Air motor is running
(typical noise), but does
not raise load
Lowering spindle not fully
closed; spring not fully
closed
Close lowering spindle
Fluid level too low due to
shipping damage or
normal consumption
Top up hydraulic fluid
Suction valves leaking
Contact service
Air motor is running
(typical noise), but does
not raise load completely
Lowering spindle not fully
closed; spring not fully
closed
Close lowering spindle
Overload valve triggered;
load too heavy
Reduce load; observe
rated load capacity
Load valves leaking
Contact service
Air motor is running when
unloaded (typical noise),
but gets increasingly
slower under load and
finally comes to a stop
Air motor running dry; no
oil in the maintenance
unit
Top up oil
Air pressure too low;
local cause
Contact service
Valve levers blocked;
mechanical (local) cause
Contact service
Control or valve blocked
by dirt and debris
Clean
Air motor is raising load
to a certain height and
then pumping dry
Fluid level too low due to
shipping damage or
normal consumption
Top up hydraulic fluid
Air motor is raising load
to a certain height and
then gets increasingly
slower
Air filter plugged; dirt
from supply network
Clean
Air pressure too low;
local cause
Contact service
Air flow rate too low;
local cause
Contact service
Air motor is raising load
to a certain height, then
gets increasingly slower
and finally comes to a
stop
Air pressure too low;
local cause
Contact service
Control or valve blocked
by dirt and debris
Clean
Air motor running very
slowly, even in idle gear
Air filter plugged; dirt
from supply network
Clean
