22.6
MAINTENANCE
INSTRUCTIONS
GRU FASSI
WITH SLEW RING
- of the slew gear screws (bolts M20 Class 12.9
:
Thightening torque = 620 Nm)
WITH RACK
- of the securing bolts for the ram pins and of all the other bolts and screws, where
the tightening torque is not expressly indicated, consult the following table in order
to find it’s value according to the bolt diameter and class.
Table of the bolts tightening torque
,
in general,
with average friction value (0,15) and
average-good tightening accuracy (C).
From ...
“ELEMENTS DE FIXATION - ASSEMBLAGES VISSES” (AFNOR E 25-030 1984)
Diameter
Class 8.8
Class 10.9
Class 12.9
Bolt = D
Torque = Nm
Torque = Nm
Torque = Nm
3
1,06
1,56
1,83
4
2,44
3,58
4,19
5
4,83
7,10
8,30
6
8,30
12,30
14,30
8
20
29
35
10
40
59
69
12
69
102
119
14
111
163
191
16
173
255
298
18
239
352
412
20
339
499
584
22
466
685
802
24
584
858
1004
27
865
1271
1487
30
1173
1723
2016
33
1594
2342
2740
36
2046
3006
3517
39
2658
3905
4570
WITH SLEW RING
Check the rotation control motoreducer oil level. Fig. 34
- Remove the bleed plug (1) using a 22 mm Allen wrench.
- Remove the plug (2) using an 8 mm Allen wrench and the O-ring.
- Top up, if necessary, with the same type of oil as indicated in the table at Paragraph 23
via the mouth (bleed plug).
- The correct level is reached when oil starts to escape from the threaded hole in plug (2).
- Check the state of wear of the O-rings (replace if necessary) and then return the plugs.
The lubrication oil can be drained completely by removing plug (3) using an 8 mm
Allen wrench.
Check the guide shoe wear as it affects the sliding section tolerances; if the clearances
are considerable, damage to the rams and the structure may occur.
Clean the air filter placed in the top of the oil tank filter cap.
Completely replace the hydraulic oil and the filter cartridges.
(!)
The waste oil and the filter cartridges MUST be disposed of by
authorized persons.
(!) CAUTION DANGER (!)
On the outer boom there is a mercury capsule (mercury level switch) duly
protected and provided with the following warning stickers.
MERCURY IS EXTREMELY TOXIC. IN CASE OF REPLACEMENT
AND/OR SCRAPPING, DISPOSE OF OR RECYCLE THE CAPSULE
CONTAINING MERCURY WITH MAXIMUM CARE, AND IN ACCORDAN-
CE WITH THE NATIONAL REGULATIONS IN FORCE.
fig. 34
3
2
1
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