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MAINTENANCE
High-Strength Bolt Connections (continued)
Check fastening and condition of control valve carrier, main
control valves (I, II and III) and swing control valve (5),
illust. Z 21777
Reference No.:
(1)
(2)
(3)
(4)
(5) Swing control valve
* SW = Wrench size
Re-tighten mounting bolts to their correct torque and replace
missing or damaged bolts.
4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH
Bolt size
Grade
mm
M24
10.9
M20
10.9
M20
10.9
M16
10.9
SW *
Tightening
mm
torque Nm
36
880
30
510
30
510
24
265
Qty.
4
3
9
3
409
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