Danfoss 51 Series Service Manual page 3

Service Manual
Series
51
and
5l-1
Motors
Service Manual
Initial startup procedures
Procedure
Always
follow this procedure when starting-up
a
new
Series 51 or
Series
51-1 installation
or
when
restarting
an
installation
in which
eitherthe pump
or
motor
has
been removed.
,&
warnimg
Tlris service r:rocedure may require disabiing the vehicle
/ rnachine (raising
the
rarheels
cf"f
the ground,
rJisconnectinq work
function,
and so forth)
v,rhile
performing, to prevent injury
to the teclrnician anil
bystanders.
Take
the
necessary safety grrecautions.
1.
Before installing the
motor
and/or pump, inspect
the
units for damage incurred during
shipping
and
handling.
2.
Make certain
all system components
(reservoir,
hoses,
valves,
fittings,
heat exchanger, and
so
forth)
are clean before
filling with fluid.
3. Fillthe
reservoir
with
recommended hydraulic fluid.
Filter using
a
10
micron
(nominal, no
bypass)
filter
into the
reservoir. Using contaminated
fluid
may
damage components which
may result
in
unexpected vehicle/mach ine movement.
4.
Fill
the inlet line leading from the
reservoir
to the pump.
5.
Check
inlet
line
for properly
tightened fittings
6.
Make sure
the inlet
line is free of restrictions and air
leaks.
7.
Fillthe motor and/or pump
housing with
clean hydraulic fluid
before start up.
Fill by
pouring filtered
oil into the upper
case
drain port.
i&
caution
itlever start
the prime mover
unless
the motor
and pump
are
filled
cornpletely with
clean hyclraulic
fh-rid.
8.
lnstall
a
G60 bar [0-1000 psil pressure gauge
in
the charge
pressure
gauge port
of
the pump to
monitor the charge
pressure
during start-up.
9.
Disconnect
any external control input
signal
(linkage
for
MDC, hydraulic
lines
for
HDC,
or electrical
connections for
EDC)
from the
pump control until
after initial start-up.
This ensures that
the pump
remains in
its
neutral position.
10.
Use a
common method
to disable the prime mover.
Jog
(slowly rotate) prime mover
until
charge
pressure starts to
rise.
1
1.
Enable
prime mover.
Start
the prime mover and run
at
the lowest possible speed
until
charge
pressure
is
established.
"&
warning
Do
not
start
the
prime mover
unless
the pump
is
in neutral
position
{swash
plaie at
0" anqle). Take
necessary precautions to prevent machine movement in
case
pump
is
actuated in stroke durinq
initiai start-up.
lf
necessary, bleed excess air from the
high pressure lines through the high
pressure sysrem gauge
port.
12.
Once charge pressure
is
established,
increase speed
to
normal operating
speed.
Charge pressure
should be
as
indicated
in
the
and determine
cause. See Troubleshootino on
pump model
code. lf charge pressure
is
low, shut down
page 29.
1.,-
C*uti*n
Low charge pressure may affect
the operators
ability
to
controlthe
machine.
1
1008567
.
Rev BA
.
June 2014
27