Dake Dura Press Force - 40/70/100 - Manual (Page 13)

Force 40 70 100 Ton
13
Malfunction Origin Remedy
Cylinder moves
slow
Air in the pump.
Air in the circuit
Damaged cylinder gaskets
Damaged or worn pump
Sequence valve jammed
Delivery oil line clogged or
choked
Bleed the air
Bleed the air
Replace the gaskets
Replace the pump
Recondition seq. valve
Check hydraulic lines
Piston will not
move
Electric motor will not turn
Piston gaskets completely
Damaged
Blocked distributor
Damaged pump
Check motor
Replace
Recondition distributor
Recondition or replace
Cylinder leaks oil Head gaskets damaged or worn Replace
Piston ram will not
build pressure
Lack of pressure from pump
Pressure control valve set low
Recondition pump
Set valve
Pump Cavitation
Filter Suction clogged
Fluid too viscous
Clean or replace
Replace
Foam forms in the
fluid
Fluid level too low
Fluid unsuitable
Fittings or joints let air in
Air discharge in the circuit
Bring back up to correct level
Replace with suitable fluid
Replace or tighten fittings
Discharge the remaining air from the
system
Pumps Worn or damaged Recondition or replace
Pressure relief
valves
Operating instability Replace or recondition
Pumps deliver little
or no oil
Pumps worn or damaged Replace and recondition
Pump will not turn Pump joint broken or undone Check or replace
Unstable valves
Valve seat damaged
Pressure not constant
Replace or recondition
Check pump or pressure relief valve
Valve parts
jammed
Dirty fluid Drain off fluid clean system and
components refill with clean and filtered
fluid
Piston moves
irregularly or will
not move
Lack of pressure from the pump
Pressure adjustment valve set
low
The translating cylinder is
damaged
Translating wheels or guides
dirty or blocked
Recondition the pump
Set the valve
Check and recondition
Clean or replace parts
Excessive wear on
parts
Oil containing abrasives
Insufficient lubrication
High operating pressure
Foreign bodies in the oil not held
back by the filter
Replace the fluid
Poor quality oil
Lowe the setting of the pressure relief
valve
Insufficient filtering, replace the filters