Kubota ,RCK60B-23BX, Руководство по ремонту

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(1) Relief valve assembly
(2) Hexagon socket head screw
(3) Relief valve assembling tool
(4) Poppet (5) Valve seat
(6) Setscrew
(A) Distance
1. Measure the pre-adjustment distance (A).
2. Compress the spring of the relief valve with a relief
valve assembling tool (3).
3. Find the distance (A) by turning the poppet (4) with
a screwdriver.
Distance (A) of re-
lief valve (For-
ward)
Reference val-
ue
39.10 to 39.20 mm
1.540 to 1.543 in.
Distance (A) of re-
lief valve (Re-
verse, ϕ1.5 mm or-
ifice)
38.60 to 38.70 mm
1.520 to 1.523 in.
The distance (A) changes by about 0.5 mm (0.02 in.) per one turn 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).
Tightening tor-
que Hexagon socket
head screw
25 to 29 N
⋅
m
2.5 to 3.0 kgf ⋅ m
18 to 21 lbf
⋅
ft
6. Install the relief valve in the HST.
7. Check the relief pressure as indicated in
“Checking
high relief pressure (Forward)” and “Checking high
relief pressure (Reverse)” . 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.
Relief valve read-
justing pressure Factory specifi-
cation
15.0 to 20.0 MPa
153 to 203 kgf/cm
2
2180 to 2900 psi
The pressure changes by 1.5 MPa (15 kgf/cm
2
, 210 psi) per 0.1 mm
(0.004 in.) in distance (A).
RELATED PAGE
4.5 Checking high relief pressure (Forward) on page
4-32
4.6 Checking high relief pressure (Reverse) on page
4-33
4. TRANSAXLE
SERVICING
4. Checking and adjusting
4-34
BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX
KiSC issued 03, 2019 A