Danfoss 51 Series Manuel d'entretien - Page 7
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Service
Manual
Series 51 and 51-1
Motors
Service
Manual
Troubleshooting
Check
Cause
Corrective action
A
T.
Control orifices
Blocked or restricted orifice
causes
motor to shift
improperly.
Remove,
inspect and clean
allorifices.
5.
Pressure
compensator piston
or
spool
Sticking
pressure
compensator piston or spool
causes
controlto
hold
motor
at
minimum
displacement.
Remove
and inspect
control
spool and sensing piston.
Repair
or replace
if necessary.
6-
Controlspoolor
piston
Sticking 4-way spool
or
control
piston
causes
motor to shift
improperly.
Remove
and inspect
4-way
spool and
control
piston.
Repair
or replace
if necessary.
7.
Two position solenoid
Two position
control not shifting motor
to
maximum displacement.
lnspect solenoid valve for bent stem or bad coil.
Repair
or replace
if necessary.
8.
Control
input
signal
lmproper control input
signal
causes
motor to
stay
at
minimum
displacement.
Correct
control input
signal.
9.
Threshold
setting
lmproper threshold
setting
causes
improper motor
displacement for
torque
required.
Check
and adjust threshold setting.
10.
Internal leakage
Excess
internal
leakage causes
charge pressure
to
decay,
reducing
output torque.
Install loop flushing defeat
option
and
monitor
case
flow.
lf case
flow
is
excessive,
motor
may require major
repair.
Contact your
Danfoss Service
Provider.
1 1
008567
.
Rev BA
.
June
201
4
31