Danfoss Series 42 Manual de servicio - Página 5
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Service
Manual
Series
42
Axial Piston
Closed
Circuit
Pumps
Troubleshooting
Overyiew
This
section provides generalsteps to
follow
if
you
observe
certain undesirable
system
conditlons,
Some
ofthe
items
are
system
speclflc. Always observe
the safety precautlons listed
in
the introduction
of
this
manual.
lf5tandard troubleshooting
procedures do not
remedythe
problem, contact
a
Danfoss Global
Service
Panner.
System
opelating
hot
Item'
Description
Action
Oil level in reservoir
Insufficient hydraulic
fl
uid
will
not
meet the cooling demands of
system.
Fill
the
reservoir to
the
proper level
with
clean hydraulic oil.
Heat
exchanger
(if
equipped)
The heat exchanger
is
not
sufficiently
cooling the system.
Check
the
air
flow
and
input
air
temperature for
the
heat
exchanger.
Clean,
repair, or
replace
the
heat
exchanger
as
necessary.
Bypass
valve
A
partially activated
bypass
valve may
result in heat generation
within the
system.
Verify that
the
bypass
valve
is
fully
closed and
that
the valve
is
seating
properly.
Repair
or replace it
as
necessary.
SCR
(System
Check/
Reliefl Valves
A partially activated
SCR
valve or
SCR
valves
with
relief settings
too low
may
result in heat generation
within
the
system.
Verifli that
the
SCR
valve
is
seating
properly and
is
at
the correct
relief
setting.
Repair
or replace it
as
necessary.
Oilfilters
Clogged oil filters may result
in
an
insufficient supply of cool
oilto
the
system.
Inspect the oil filters
and
verify
that
they
are
still operable.
Replace
them
if
necessary.
Machine load
Excessive loads
or extreme
duty
rycles
could result
in
the pump
and/ or
motor
operating
at speeds
and
pressures
beyond
system
design
limitations.
Veriff
that
the
machine
is
operating
within the
parameters for
which
it
was
designed. lf
necessary,
reduce the load
on
the
machine.
System
response
is
sluggish
Item
Description
Action
Reservoir
oil level
There
is
an
insufficient amount
of
hydraulic
fluid,
resulting
in
an
inadequate supply for the system loop.
Fill
the reservoir to the proper level
with
clean hydraulic
fluid.
Input control
signal (linkage,
current, or
pressure)
The
pump
is
receiving
a
faulty control
signal:
(MDC -
binding
or broken
linkage;
EDC
-
faulty
or inadequate
electrical
signal;
HDC'
blocked
or
incorrectly orificed
control
lines).
Veriff
that
the input
signal
is
correct
and identical in
both
directions.
Pump
control
A
damaged
pump control
or
control
spoolwill
not correctly transmit
the
control input signalto the pump.
Verify that
the
pump's
control
is
operating
properly
and
that the
controlspool
is
not damaged
orworn
and
moves
freely
within
its
bore. Clean,
repair,
or replace it
as
necessary.
Bypass
valve
A
partially activated
bypass
valve
will
cause cross
port
leakage.
Veriff
that
the
bypass
valve
is
closed
and
that
the valve
is
seating properly.
Clean, repair,
or
replace
it
as necessary.
SCR
(system
check
/
reliefl
valves
One
or both of
the
SCR
valves
may be
binding within their
bores.
Veriff that the
SCR
valves
operate
freely.
Repair
or
replace
them
as
necessary.
520L0638
.
Rev
0300 .
July
201 5