Operation Manual

BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
BACKHOE
[5] HYDRAULIC FITTINGS
• Adaptors, Elbows and Others
Item Shape
Thread size
Tightening torque
N'm
kgf'm
IbHt
I
~~
9/16
37 to 44
3.8 to 4.5 27 to 33
Adjustable elbow,
Adaptor (O-ring
3/4
48 to 54 4.9 to 5.5
35 to 40
port) (LlNF)
a a
[A] Nut Type
[8] No Nut Type
7/8 77 to 85
7.9 to 8.6 57 to 62
a: O-ring
9/16
22 to 25 2.3 to 2.6 16 to 19
Jill:Q4
It
Hose fitting, Flare
3/4
36 to 40
3.6 to
4.1 26 to 30
nut (UNF)
7/8 43 to 50 4.4 to 5.0 32 to 36
~
1/4
30 to 50 3.1 to 5.0 23 to 36
Adaptor (NPT)
3/8
I
39 to 60 4.0 to 6.1
29 to 44
112 49 to 58
5.0 to 5.9 36 to 43
• NOTE
• When connecting a hose with flare nut, after tightening the nut with specified torque, return it
approximately 45 degrees (0.79 rad) and re-tighten it to specified torque.
W1015484
[6] TIGHTENING TORQUES OF SCREWS, BOLT AND NUTS ON THE
TABLE BELOW ARE ESPECIALLY SPECIFIED
Item
N'm
kgf·m ft-Ibs
Boom cylinder head
350 to 400 35.7 to 40.7 259 to 295
Dipperstick cylinder and stabilizer cylinder head 250 to 280 25.5 to 28.5 185 to 206
Bucket cylinder head
200 to 230 20.4 to 23.4 148 to 169
Swing cylinder head
246 to 274
25.0 to 28.0
181 to 202
Boom cylinder piston mounting nut
200 to 230 20.4 to 23.4 148 to 169
Cylinder piston mounting nut (Dipperstick, Stabilizer.
Bucket)
150 to 180
15.3to 18.3
111 to 132
Swing cylinder piston mounting nut
216 to 245
22.0 to 25.0 159 to
181
W1012736
9-S9