Danfoss PVG 32 Service Manual page 2

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Service
Manual
PVG
32
Proportional Valve Group
System
Troubleshootin g
Overview
A
Warning
l-his
troubleshooting
guide for the
PVG
valve assemblies
cjoes
not
cover valves
that
have
been
alterecj
from original valve build specifications
This
section provldes generalsteps to follow
if undesirable
5ystem
conditions
are
observed. Followthe
5tep5listed
untilthe problem
is
solved. Some of the items
will
be system specific. Always observe the
safety
precautions listed
in the /ntfoduct on sectlon, and
related
to your
specific
equipment.
Confirm
thatvalve
i5
built properly accordlng to the specification
sheet.
lfnecessary installa
lev€r
to
thevalvetoveri!
proper mechantcal function.
Refer
to
PVG 32
Technical Information Manual52OtO344
for valve
configuratlon information.
Refef
to
PVG
32
Parts
Manual
11006794for
part numbers.
Troubl€shooting
a PVG
Yalv€
THINK-
before
troubleshooting
a
problem.
Everyfault location process shouldfollow
a
logicaland
systematlc order.
It
is
wisest to
start at
the
beglnnlng:
.
lsthe oil
level correct when
the pump
is
op€ratlng?
.
ls
the
condition ofoiland
filters acceptable?
.
Are pressure. flow,
and
flow
direction
as
5pecifled?
.
lsrhe oiltemperature too
high ortoo low
(oilviscosity)?
.
Are
thele
any unusual
vibratlons or
noise
(cavitatlon)?
lf
the driver ofthe vehicle
i5
available, ask
him:
.
What type of
f"ult
it
is
and how
it affects the
system?
.
How long
he has
he
felt
that
something
has been
wrong?
.
lfhe
has'fiddled" with
the comDonents?
.
lf he
has
any hydraulic
and electrtcal diagrams available?
Diagrams
areoften found
in the instyuctions included with vehiclevmachines,
,
Unfonunately they
are often
50
technical
that
they
are
not of much
use in
a
fault locatlon situation.
However the diagram
usuallyshowsthe
order of, and the connections between, the individual
components.
When
a
defective component
is
identified, clean the componentand
its surroundings before removal.
Remove loose
paintfrom
pipes and fittings.
Coverallholes,
hoses and
pipe
end5
with plugs
or
seal
with, for example, plastic bags
after
removalto
avoid
the entry of dirt
durlng
repairs.
Never disassemble
hydraulic components outside,
Perform
repairs in
a
workshop on
a
clean
workbench
(covered
with
clean cloth or newspaper).
.
Make sure
that
a
Danfoss service
manualfor
with
the product
is
handy.
'
Followthe
instructions word for word during disassembly
and assembly,
lfthese
lnstructions
are not
followed
closely
the
syster!
may not operate correctly after
repairs are
comDleted.
Notethat
in some
cases
specialtools
are neressary
for assembling the
product
14 |
1
0391
57 .
Rev BA
.
May
201
4