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水ポンプ Danfoss Series 42のPDF サービスマニュアルをオンラインで閲覧またはダウンロードできます。Danfoss Series 42 7 ページ。 Axial piston closed circuit pumps
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Service
Manual
Series
42
Axial Piston
Closed
Circuit
Pumps
Troubleshooting
System
will
not operate
in
either direction
Item
Descfiption
Action
Charge pressure
(in
neutral)
The
is
low charge pressure resulting
from
a
damaged charge
pump
or
low
charge pressure relief valve setting.
Inspect the charge pump for damage
and verifiTthe charge
pressure
relief
valve setting.
Repair
or
replace
it
as
necessary.
Charge pressure
(in
stroke)
There
is
low charge'pressure resulting
from internalleakage within the
system.
Repair
or
replacethe component or
components
within
the
system
causing
the
internal
leakage.
Servo
pressure
There
is
insufficient
pressure
differential
across
the
servo piston.
Check
servo
pressures
at
port
M4
and
M5
to
veriff
sufficient
pressure
delta.
Veriff
that
the
servo
supply and
drain
paths
are
unobstructed and that any
orifices
are
of the correct
size and
free
of debris.
Clean,
repair, or replace
as
necessary.
Charge
pump
The
charge
pump
has
been damaged
or installed
with the incorrect
rotational
orientation.
Verifo
that the charge
pump
is
in
good
working
order and
that
it
is
correctly
installed.
Repair
or replace it
as
necessary.
Item
Description
Actioh
Oillevelin
reservoir
There
is
insufficient
hydraulic
fluid to
supply
the
system
loop.
Fill
the
reservoir
to the
proper level
with
clean hydraulic oil.
Input controlsignal
(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).
Veriry
that
the input
signal
is
correct
and identical in
both
directions. Adjust,
clean, repair,
or
replace
the input
device
as
necessary.
Oilfilters
Clogged
oilfilters
may result in
an
insufficient supply of oil
to
the
system.
Inspect the oil filters and
verifi7
that
they
are
still serviceable.
Replace
them
as
necessary.
Bypass
valve
A partially activated
bypass
valve may
result
in
a
cross
port
leakage.
Verifi7
that
the
bypass valves are
closed
and that the
valves are
seating
properly.
Clean, repair,
or
replace
them
as necessary.
Charge pressure
{in
neutral)
Charge
pressure may be insufficient
to
recharge
the system
loop.
Inspect the charge pump for damage
and
verifi7
that the charge pressure
relief
rralve
is
at
the
proper setting.
Repair
or
replace it
as
necessary.
Charge pressure
(in
stroke)
There
is
low charge pressure resulting
from
internal leakage
within
the
system.
Repair
or
replace
the
component
or
componenls
within
the system causing
the
internalleakage.
Servo
pressure
There
is
an insufficient pressure
differential
across
the
servo piston.
Check servo pressures
to
verifi7
sufficient
pressure
delta.
Verifi7
that
the
servo supply and drain paths
are
unobstructed and
that
any
orifices are
of the correct
size
and free of debris.
Clean, repair,
or
replace
them
as
necessary.
Charge
pump
The
charge
pump
is
damaged or
has
been installed
with the incorrect
rotational
orientation.
a
Veriff that
the charge
pump
is
in
good
working
order
and
that
it
is
correctly
installed.
Repair
or replace
it
as
necessary.
520L0638
.
Rev
0300 .
July
201 5