Operation Manual
BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
TRANSAXLE
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(4)
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(5)
(3)
(1)
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Readjustment
of
Relief Valve (When the HST does
not
Work
Due
to
its
Loose Hexagon Socket Head Screw)
• IMPORTANT
• KUBOTA does
not
recommend the readjustment
of
relief
valve. KUBOTA recommends
with
genuine parts.
• As the HST may be damaged
ifthe
pressure
is
setto
high
by
mistake, be careful when adjusting it.
• NOTE
• The relief pressure
is
set
in between
20.1
to
21.1
MPa
(205
to
215 kgf/cm
2
,
2920
to
3060 psi) when shipped
from
the
factory. But,
for
the purpose
of
after-sales services, as
it
is
impossible
to
reset the pressure precisely as set in the
factory,
its
setting range
is
defined as a
slightly
wider
range
between 15.0
to
20.0
MPa
(153
to
203 kgf/cm
2
,
2180
to
2900
psi).
1.
Measure the pre-adjustment distance
A.
2.
Compress the spring
of
the relief valve with a relief valve
assembling tool (3).
3.
Then, find the distance A by turning the poppet (4) with a
screwdriver.
Reference: The distance A changes by about 0.5 mm (0.02 in.)
per one
tu
rn
of the poppet (4).
4.
Repeat the same operation a few times to find the distance A as
it
is
difficult to acquire at the first time.
5.
After finding the distance A, hold the setscrew (6) to a vice and
fasten the hexagon socket head screw (2) with specified torque.
On
this occasion, use a copper plate, etc. for the vice jaws not to
damage the setscrew (6).
6.
Install the relief valve
in
the HST.
7.
Check the relief pressure as indicated
in
page 2-S12 and 2-S13.
The distance A is for refresh only. Make sure to check the relief
pressure after readjustment.
8.
If the relief pressure does not fall within the readjustment
pressure range, repeat the processes
of
the above.
Reference: The pressure changes by 1.5 MPa (15 kgf/cm
2
,
210
psi) per
0.1
mm
(0.004 in.)
in
distance A
nghtening
torque
Hexagon socket head
screw
25
to 29
N'm
2.5
to
3.0 kgf·m
18 to 211bHt
15.0 to 20.0 MPa
Relief valve readjusting
Factory spec. 153 to 203 kgf/cm
2
pressure
2180 to 2900 psi
Distance A
of
relief
valve (Forward)
Reference value
39.10 to 39.20 mm
1.540 to 1.543 in.
Distance A of relief
valve (Reverse, $1.5
mm orifice)
Reference value
38.60 to 38.70 mm
1.520 to 1.523 in.
(1) Relief Valve Assembly
(5) Valve Seat
(2) Hexagon Socket Head Screw
(6) Setscrew
(3) Relief Valve Assembling Tool
(4) Poppet
A:
Distance
W1082809
2-S14