BAYKAL APH Series, User Manual

Page: 85 / 93

BAYKAL
EDITION NO : APH SECTION :
DATE OF ISSUE : July-2005 PAGE : 85
8. TROUBLESHOOTING
Problem Possible causes Correction
a) Beam descends, but no
bending
-Leakage in refill valve
-Pressure relief valve is blocked
-Failure in pressure relief valve
-Failure in directional valve
-Spool of directional valve is burnt
-Pump failure
-Piston seals are torn out
-Low voltage -Clean valve
-Clean valve
-Change valve
-Change valve
-Change spool
-Change pump
-Change seals
-Call electrician
b) Beam descends, but does not
return -Pressure relief valve is blocked
-Failure in pressure relief valve
-Failure in directional valve
-Spool of directional valve is burt
-Leakage in pipes
-Pump failure
-Cylinder seals are damaged
-Failure in pressure switch -Clean valve
-Change valve
-Change valve
-Change spool
-Check and tighten pipe
fittings
-Change pump
-Check and replace seals if
necessary
-Change pressure switch
c) Oil leaking from cylinders -Throat seal is damaged
-Cylinder o-ring is damaged
-Piston seal is torn out -Change seal
-Change o-ring
-Change seal
d) Beam does not descend
accurately -Torsion bar conical slides are loose -Re-set slide clearance
e) Bending angle cannot be set -Piston screw reducer or main reducers
are damaged
-Call service
f) Oil leakage in fittings -Fittings are loose -Tighten fittings
!!! IMPORTANT REMINDER : In the following cases the material cannot be bent, even
though the machine works normally.
1
Appropriate
″
Vee
″
is not selected: Refeter to bending chart and select the correct vee.
2
Material specification is harder than St.42: Bending chart is arranged according to St.42
material specification. If the correct vee is selected, but still the material cannot be
formed, then its specification is harder than St.42 In this case, a wider vee must be used.