WHAT TO DO
POSSIBLE CAUSE
PROBLEM
Inspect and tighten all fittings and seals.
Remove and inspect.
Exchange left and right valves. Replace
defective valve.
Bleed air.
Replace seal.
Replace level valve.
Replace analog board.
Reset counterbalance pressure - refer to this
section.
Repair or replace.
CAUTION: Block ram to prevent from
falling.
Replace seal.
Close or replace valve.
Check main relief valve pressure - contact
CINCINNATI Service.
Replace seal.
Remove and inspect.
Remove and inspect.
Check solenoid valve electrical signal and
spool shift.
Call CINCINNATI Service.
Check and replace.
Adjust if necessary.
Clogged inlet line.
Low fluid level.
Contaminated fluid - replace.
Overhaul - replace.
Loose connections.
Check speed change point and adjust.
Inspect and replace.
Replace encoder assembly.
Tighten.
Center load on machine.
Tilt ram to compensate or replace dies.
Shim dies.
Air entering prefill area thru piping or seals.
Slow or erratic operation of prefill valve(s).
Air in Auto Crown (optional).
Piston seal leaking.
Level circuit failure.
Counterbalance valve pressure set too low.
Defective counterbalance valve.
Piston seal or piston rod seal leaking.
Cylinder bleed valve open.
Main relief valve pressure set too low.
Piston seal leaking.
Fill valve(s) remain open.
Defective fill valve(s)
Fill pilot valve.
Temperature control sensor set too high.
Defective temperature control sensor.
Check stand-by pressure.
Cavitation.
Worn pump.
Air in fluid.
Speed reversal position too close to material
contact point.
Improper or worn dies.
Defective transducers.
Loose transducers.
Off-center machine loading.
Worn dies.
Machine and / or die defection.
Hesitation of a cylinder
at speed change and / or
erratic leveling at the
bottom of the stroke.
Ram goes out-of-level
during bend and shuts
off drive motor.
Ram drifts down rapidly
when in idle - this can
result in ram tilt beyond
limits, shutting off drive
motor.
Ram stalls during bend -
will not reverse direction
or reach maximum
capacity.
Hydraulic fluid is exces-
sively hot (machines
equipped with oil coolers).
Noisy pump.
Inconsistent bends.
Non-uniform bends
(end-to-end).
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