to ensure safe operation of the hydraulic steering and linkage. In extremely low temperatures, it may be
necessary to warm up the entire tractor.
Avoid mixing with mineral oils, e.g. with any oil remaining in the system or by connecting and operating an
external implement. This may affect the positive environmental properties of the fluid, and will make it
more difficult to dispose of (it will then have to be considered as hazardous waste).
Current legislation and the instructions of the oil manufacturer must be observed when disposing of oil.
A mixture containing more than 20% may result in alterations in viscosity and may lead to problems with
the hydraulic valves.
Maintenance intervals
The oil and oil filter need to be changed every 1000 running hours or every year, whichever occurs first.
When switching to biodegradable hydraulic oil, change the hydraulic oil filter after approx. 50–100 running
hours. Since biodegradable hydraulic oil acts as a solvent, any oil residue may block the filter.
Special features of biodegradable hydraulic oil
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
GUID-4E08F746-8690-4BAE-B106-AFB4E98FE044 [V3]
1. Tractor
1-26
FENDT 700 Vario S4
X990.005.538.013
