Hardi COMMANDER 5500, Instruction Book

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6 - Maintenance
103
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 176° F (80 °C), and the oil streaming out can penetrate
human skin. Risk of burns on the skin, internal injuries and facial injuries.
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WARNING! Applying too little torque will result in these risks:
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WARNING! Applying too much torque will result in these risks:
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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.
10 Hours Service - Spraying Circuit
Fill with clean water and operate all functions.
Check for leaks using a higher spray pressure than normal.
Check nozzle spray patterns visually using clean water.
Hose size Thread size Wrench size Recommended torque
1/4 “ 9/16 “ 3/4” (19 mm) 21 Ft/lb (28 Nm)
3/8 “ 11/16 “ 7/8” (22 mm) 32 Ft/lb (44 Nm)
1/2 “ 13/16 “ 15/16” (24 mm) 46 Ft/lb (62 Nm)
3/4 “ 13/16 “ 1-7/16” (36 mm) 96 Ft/lb (130 Nm)
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hydraulic joints will leak due to the high oil pressure.
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hydraulic joints will rattle and thus fail under fatigue.
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hydraulic joints are being worn quickly and thus will not fulfill their design purpose.
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accidents caused by sudden loss of oil pressure due to hydraulic parts coming apart.
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damaging or stripping the threads and deforming the hydraulic joints.
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fittings will be broken.
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hydraulic joints will leaks.
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accidents caused by assembled parts coming apart due to bolts breaking at a later time.