HURST SP 333 - 11 Troubleshooting

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11. Troubleshooting
Trouble Control Cause Solution
Spreader arms move
slowly or jerkily when
activated
Are the hoses
connected
properly?
Air in the hydraulic
system
Deaerate pump
system
Does the pump
unit work?
Device doesn’t
perform at its given
power
Check the
hydraulic uid level
in the supplying
pump
Insu󰀩cient
hydraulic uid in
the pump
Top up hydraulic uid,
deaerate
Following release,
the star grip doesn’t
return to the central
position
Star grip hard to
move?
Damage to the
torsion spring for
reset
Repair by an
authorised dealer, by
personnel specially
trained by HURST, or
by HURST itself
Soiled valve or
star grip
Defective valve
Other mechanical
damage (e. g. star
grip)
Hoses cannot be
coupled
Pressure too high
(e.g. caused by
too-high ambient
temperature)
Set hydraulic pump
to pressureless
circulation
Coupling defective Coupling needs to be
replaced immediately
It is frequently not
possible to couple
hose assemblies
Control the
degree of viscosity
and application
temperature of
the used hydraulic
uid
Hydraulic uid
not adapted to
the application
situation
Hydraulic uid
must be replaced
(see chapter
“Recommended
Hydraulic uids”)
Coupling defective Coupling needs to be
replaced immediately
Damages on the
surface of the
hydraulic hoses
Mechanical
damages or
contact with
aggressive agents
Replace hoses
Hydraulic uid leaks
on the piston rod
Defective rod seal Repair by an
authorised dealer, by
personnel specially
trained by HURST, or
by HURST itself
Damage to the
piston