6 - Maintenance
91
Tightening Hydraulic Hoses
When tightening hydraulic hoses as a part of periodic service or due to replacement of spare parts, it is important to apply
the correct torque. This will prevent accidents and prolong the lifetime of the parts connected with the hoses.
If not otherwise stated in this book, please tighten hydraulic hoses using the following torques:
€
DANGER! A hydraulic hose or joint leaking or coming apart with the oil under pressure can cause severe injuries to
persons standing nearby! The oil can be very hot, around 80 °C, and the oil streaming out can penetrate human skin.
Risk of burns on the skin, internal injuries and facial injuries.
±
WARNING! Applying too little torque will result in these risks:
•
hydraulic joints will leak due to the high oil pressure.
•
hydraulic joints will rattle and thus fail under fatigue.
•
hydraulic joints are being worn quickly and thus will not fulfil their design purpose.
•
accidents caused by sudden loss of oil pressure due to hydraulic parts coming apart.
±
WARNING! Applying too much torque will result in these risks:
•
damaging or stripping the threads and deforming the hydraulic joints.
•
fittings will be broken.
•
hydraulic joints will leaks.
•
accidents caused by assembled parts coming apart due to bolts breaking at a later time.
±
WARNING! When assembling a hydraulic joint, this is often being twisted around in different directions to make it fit
between other components on the sprayer. Remember to finish off by applying the correct torque.
÷
NOTE! The sealing system for hoses and fittings is ORFS type (O-Ring Face Seal). This ensures a high level of sealing
and good vibration resistance. The fittings use the O-ring compression mechanism to seal.
Hose
size (“)
Fitting
thread size (“)
Spanner
size (mm)
Recommended
torque (Nm)
1/4
9/16
19
28
3/8
11/16
22
44
1/2
13/16
24
62
3/4
13/16
36
130
Summary of Contents for NK MB Series
Page 8: ...1 Identification 8 ...
Page 52: ...3 Description 52 ...
Page 62: ...4 Sprayer Setup 62 ...
Page 84: ...5 Operation 84 ...
Page 87: ...6 Maintenance 87 Boom Lubrication Oiling Plan Lift Lubrication Oiling Plan ...
Page 116: ...9 EC Declaration 116 ...
Page 120: ...Index 120 ...
Page 122: ...HARDI INTERNATIONAL A S Helgeshøj Allé 38 DK 2630 Taastrup DENMARK ...