Danfoss 51 Series Service Manual - Page 9

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Danfoss 51 Series Service Manual
ffi@
Service
Manual
Series
51
and
51-I
Motors
Service
Manual
Adjustments
Minimum
displacement
limiter
Clockwise
rotation
of
the
plug
increases
the setting, and counterclockwise
rotation
decreases
the
setting.
The
charge
pressure
setting
will
be reduced or
increased
at
a
rate
of approximately
3.4 bar [50
psil
per
turn.
3.
After adjusting
the
plug, torque
the
locknut
to
52
N.m
[38
lbf.ft].
Do
not
overtorque
4.
Removethegauges.
5.
Reinstallthe
port
plugs.
Motors
with
loop
flushing
defeated, or equipped
with
an
orificed charge
pressure relief
valve
(see
Charge
relief valve
on
page
44)
do not
require adjustment.
Series
51-l
charge
pressure
relief valve
.fu
Warnlng
Adjustment of the
minimum
dispiacement limiter
can
result in undesirable or
unsafe speed
contjitions.
Consult'with
the
Original Equipment Manufacturer or your
Danfoss
representative before chapging the
minimum
displacement setting. After adjustment,
rrerifv
minimunr displacement settinq
bv
using
an
appropriate test apparatus.
The
factory
sets
minimum
displacement.
A
tamper-resistant
cap covers
the adjustment
screw.
lffi
Caurion
I
o
avoid unexpected
changes
in operating
ccnditioris
and
to
prevent external
lealcage,
torque
the
lock
irut
{Y20)
after
everv
adiustment.
Detect changes
in
motor
displacement by
providing
a
constant
flow
of
fluid
to
the
motor,
while
maintaining
the motor
at
minimum
displacement and
monitoring the motor output
shaft
speed.
An
increase
in displacement
will
result in
a
decrease in
shaft
speed,
while
a
decrease in
displacement
will
result
in
an
increase in
shaft
speed.
Adjustin
g
minimum
displacement
1.
Remove
the tamper
resistant
cap (e120) from
the
adjusting screw (ylO). Removing the
tamper
resistant cap
destroys the locking device.
2.
Discard
the
cap
(Qt
zO1
after
comparing
it
with
a
new
one
to
make sure
the new
one
fits.
ffi
ttl,u
inch
52
Nm
[38lbf'ftl
Adjustment plug
1
1008567 .
Rev
BA.
June
2014
33