Tightening Torques Of Screws, Bolt And Nuts On The - Kubota BX24 Workshop Manual

BX24, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
4. TIGHTENING TORQUES
[1] GENERAL USE SCREWS, BOLTS AND NUTS
Screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual should be tightened
according to the table below.
American standard cap screws with UNC or UNF threads
Grade
Unit
N·m
Size
1/4
9.8 to 11.7
5/16
19.0 to 23.1
3/8
33.9 to 40.7
1/2
88.1 to 105.8
9/16
122.0 to 146.4
5/8
176.3 to 211.5
[2] HYDRAULIC HOSES FITTING AND FLARE PIPES
Item Thread size
9/16
Adjustable elbow and
3/4
adapter
7/8
9/16
Hose fitting and flare
3/4
nut
7/8
3/8
Adapter (NPT)
1/2
Adapter G (PF)
1/4
[Equivalent for NPSF]
3/8
NOTE

• When connecting a hose with flare nut, after tightening the nut with specified torque, return it
approximately 45 degrees and re-tighten it to specified torque.

[3] TIGHTENING TORQUES OF SCREWS, BOLT AND NUTS ON THE

TABLE BELOW ARE ESPECIALLY SPECIFIED
Boom cylinder head
Dipperstick cylinder and stabilizer cylinder head
Bucket cylinder head
Swing cylinder head
Boom cylinder piston mounting nut
Cylinder piston mounting nut (Dipperstick, Stabilizer,
Bucket)
Swing cylinder piston mounting nut
SAE grade 5 or 8
kgf·m ft-lbs
1.0 to 1.2 7.2 to 8.6
1.9 to 2.4 14 to 17
3.5 to 4.2 25 to 30
9.0 to 10.8 65 to 78
12.4 to 14.9 90 to 108
18.0 to 21.6 130 to 156
Tightening torque
N·m
37 to 44 3.7 to 4.6
47 to 54 4.8 to 5.5
77 to 85 7.9 to 8.7
22 to 25 2.2 to 2.6
47 to 54 4.8 to 5.5
43 to 50 4.4 to 5.1
39 to 44 3.9 to 4.4
49 to 58 5.0 to 5.9
25 to 29 2.6 to 2.9
49 to 54 5.0 to 5.5
Item
Grade
Unit
N·m
Size
M6
9.8 to 11.2
M8
23.6 to 27.4
M10
48.1 to 55.8
M12
77.5 to 90.1
M14
124 to 147
M16
196 to 225
kgf·m ft-lbs
27 to 33
35 to 40
57 to 63
16 to 19
35 to 40
32 to 37
28 to 32
36 to 43
19 to 21
36 to 39
N·m
350 to 400
250 to 280
200 to 230
246 to 274
200 to 230
150 to 180
216 to 245
9-S7
BACKHOE
Metric cap screws
Grade 8.8 (Approx. SAE grade 5)
kgf·m
1.0 to 1.1 7.2 to 8.3
2.4 to 2.8 17.4 to 20.2
4.9 to 5.7 35.5 to 41.2
7.9 to 9.2 57.2 to 66.5
12.6 to 15.0 91.2 to 108
20.0 to 23.0 145 to 166
kgf·m ft-lbs
35.7 to 40.7 259 to 295
25.5 to 28.5 185 to 206
20.4 to 23.4 148 to 169
25.0 to 28.0 181 to 202
20.4 to 23.4 148 to 169
15.3 to 18.3 111 to 132
22.0 to 25.0 159 to 181
KiSC issued 08, 2019 A
ft-lbs
W1012507
W1013389
W1012736