babcopark Starke 2121, User Manual

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Pressure shock
Insufficient
thrust or
lowered
motion speed
Leakage
Noise
Overlarge cushion clearance Reduce cushion clearance
Bent piston rod results in intense fric�on Piston rod to be straightened
Oversize or undersize fit clearance
between bore and piston, broken or too
�ght seals result in inner leakage or large
moving resistance
Repair or replace part with wrong size and
accuracy. Seals to be re-assembled,
adjusted or replaced
manufacture errors or poor assembly of
moving parts results in decentra�on or
intense fric�on on one side
Repair parts with errors, or re-assemble
Scratch on bore results in blocked piston, or
poorly processed bore
bore honing, repair or replace cylinder
tube
Contaminated oil by too much foreign
par�cles makes piston or piston rod blocked
Clean hydraulic circuit, and replace
hydraulic oil
One-way valve/thro�le valve to be repaired
Diameter of oil return pipe to be enlarged, turn
down the pressure of back pressure valve
Voltage shortage due to low supply voltage Screw to be �ghtened
Longitudinal scratch or groove mark
between moving parts inside cylinder body
Parts to be repaired or replaced
Vibra�on of inlet and outlet pipes results
in loosening
Tighten oil pipes, or amend connec�on
type
Contaminated oil by air Air to be eliminated by exhaust
Too �ght clearance between rela�ve
sliding surfaces
To be re-assembled with proper clearance
Too high sealing fric�on, lack of lubrica�on
on sling surface
Bo�om diameter and width of seal groove,
compression amount of seals to be
correctly designed and manufactured
Deformed or damaged guiding support ring
Guiding support ring to be repaired or
replaced
Overlarge pressure in cushion chamber due
to undersized volume
Diameter and length of cushion chamber
to be increased
Too high oil temperature results in more
leakage
Insufficient oil supply of power pack Power pack to be repaired or replaced
One-way valve/thro�le valve failure in
cushion device
Find out the reason of oil temperature
rising and amend seal structure to lower
down oil temperature
Too high oil return resistance in hydraulic
return line
Too low se�ng pressure or regula�ng
failure of pressure relief valve
Turn up se�ng pressure, or fix pressure
relief valve
Seal to be replaced Galling, scratch or damage of seal
Wrong direc�on of seal Sealing direc�on to be corrected
53
Surface Cleaning & Maintenance