When switching to biodegradable hydraulic oil, change the hydraulic oil filter after approx. 50 to 100
running hours. Since biodegradable hydraulic oil acts as a solvent, any oil residue may block the filter.
Specific features
Biodegradable hydraulic oil is more easily biodegradable and has less of an effect on the ground and
groundwater in the event of accidental spills.
IMPORTANT:
In spite of the high environmental compatibility of biodegradable hydraulic oil, accidental spills must always
be reported.
1.1.9 Tightening torque for screws with a galvanized surface
Choose the correct friction coefficient
To ensure that the tightening torque and preload value can be accurately determined, it is essential to
know the
friction coefficient (µ
total
)
. Varying surface properties and lubrication conditions give rise to a
wide range of friction coefficients. If not otherwise specified, tightening torques can be calculated based
on their friction coefficient using the table below.
NOTE:
Locking screws with retaining ridges on the screw head contact surface have a greater friction coefficient.
Tightening torques in relation to the friction coefficient
Metric thread with a friction coefficient of µ
total
= 0.14
6.9
8.8
10.9
12.9
Size
Nm
kpm
Nm
kpm
Nm
kpm
Nm
kpm
M6
8.4
0.85
9.8
1
13.7
1.4
16.7
1.7
M8
20.6
2.1
24.5
2.5
34.3
3.5
40.2
4.1
M10
40.2
4.1
48.1
4.9
67.7
6.9
81.4
8.3
M12
70.6
7.2
84.4
8.6
117.7
12
142.2
14.5
M14
112.8
11.5
132.4
13.5
186.4
19
225.6
23
M16
176.6
18
206
21
289.4
29.5
348.2
35.5
M18
240.3
24.5
284.5
29
392.4
40
475.8
48.5
M20
338.4
34.5
402.2
41
569
58
676.9
69
M22
456.2
46.5
539.5
55
765.2
78
912.3
93
M24
588.6
60
696.5
71
981
100
1177.2
120
M27
873.1
89
1030
105
1471.5
150
1765.8
180
M30
1177.2
120
1422.4
145
1962
200
2354.4
240
GUID-4E08F746-8690-4BAE-B106-AFB4E98FE044 [V3]
1. Overall system/tractor
1-24
FENDT 800 Vario S4
X990.005.530.013
