Danfoss 51 Series Service Manual page 8

Service
Manual
Series 51 and
51-1 Motors
Service
Manual
Adjustments
Overview
...,fu
Warninq
This service
procedure may require disabiing the vehicle
1
machine
(raising
the wheels off the ground,
disconnectinq the
worl<
function,
arrd so
forth) wlrile performing,
in
order to
prevent injury to
the
technician
anc.l bystanders.
T..ike
tlre
necessary safety precautions
Adjust components of the
Series 51 and Series
51-l
motors
perfollowing
procedures (where
necessary,
refer
to
Pressure measuremenfs
on page
23,
for gauge
port
locations and
sizes):
Charge
pressure relief
valve
Set
the charge pressure relief valve
to
the modelorder
code specifications.In most applications, the
motorchargereliefvalveisset2to4bar [29to58psil
belowthesettingofthepumpchargereliefvalve
(measured
with the
pump
in its neutral or zero-angle position).
This
setting
assumes
a
reservoir
temperature of
50" Cl'122'F]. Charge pressure
is
referenced {additive) to
case
pressure.
Measuring
charge
pressure
1. Install
a 0
to
60
bar
[0
to
t
000
psil
pressure gauge in
port Ml
or
M2
(use
which
ever
is
at
low
loop
pressure).
2.
Install
a
0
to
60 bar
[0
to
t
000
psil gauge in port Ll
or
L2
to
measure case pressure.
3.
Operate the
system
with the prime mover
at
normal operating
speed
and the pump at half stroke
(forward or
reverse).
Series
51 charge pressure relief valve
Adjustment
plug
"7
t
I
l16
lock nut
i-*"1
l-t'l
l.'-'l
0't
208E
Older
Series
5'l and
Series 51-1 motors may
be
equipped with
an externalscrew adjustable charge
pressure relief
valve (not shown).
Adjusting
charge
pressure
"dh
warning
Itrcorrect charge
pressure
setiings may resuit in the inability to build
required
system pressure and / or
inadequate loop flushinq flows.
You must maintain ihe
correct charge pressure uncler all operation
conditions to maintain pump performance
1. Loosen the
lock nut using a
11/16 hex
wrench.
2, Turn the adjustment plug
with
a
large screwdriverar
l3mm
hex wrench.
,^A
\_-/
\@-
32
I
1
008567
.
Rev BA
.
June
201
4