Haulotte Group HT21RT O, Maintenance Book

Page: 224 / 282

224 4000511390 E03.16 USA / GB
Hydraulics
Hoses inspection - Replacement
MS0020
3 - Hoses Disassembling
For safety reasons, respect imperatively the following conditions of disassembling :
• Fold the machine on a flat and released ground :
• The machine is not in slope.
• The boom is horizontal.
• Put the turret (if equipped) in the axis.
• Carry out a beaconing of the sector (maximum risk zone = machine height).
• Locate the hoses and their connections points to guarantee the good performance of the machine after intervention.
• Locate the hoses course to facilitate the reassembly.
To recover oil, use an oils container in order not to pollute the environment.
After disassembling :
• Close the hose openings and the hydraulic components to avoid the pollution of the hydraulic system.
• Check the cleanliness of the hoses and the hydraulic components :
• Absence of plastic, rubber or metal shaving.
• If necessary, purge and clean the circuit (tank included).
4 - Hoses Reassembly
For safety reasons, respect imperatively the following conditions of reassembly :
• Using the reference marks carried out previously; carry out the courses of hoses.
• During the fixing of the hoses, respect the tightening torques below.
T i g h t e n i n g t o r q u e t a b l e
Once all the hoses are correctly tight :
• Put the machine in operational configuration
• Carry out some movements implementing the hoses concerned in order to purge the hydraulic system.
• Check the absence of leakage.
• Control the level of hydraulic oil tank.
• Check the pressures.
Unscrew the flexible device slowly in order to make fall residual water pressure.
It is imperative to secure and maintain cylinders when removing hoses cylinders. An analysis of the
hydraulic system is imperative.
Description Torque (JIC) Torque (ORFS)
Hose 1/4" (diameter 6mm) 1,5 daN.m(11,08 lbf.ft) 2,6 daN.m(19,22 lbf.ft)
Hose 3/8" (diameter 10mm) 3,5 daN.m(25,86 lbf.ft) 4,2 daN.m(31,04 lbf.ft)
Hose 1/2" (diameter 12mm) 5 daN.m(36,95 lbf.ft) 5,7 daN.m(42,12 lbf.ft)
Hose 5/8" (diameter 16mm) 8 daN.m(59,12 lbf.ft) 8,5 daN.m(62,82 lbf.ft)
Hose 3/4" (diameter 19) 10 daN.m(73,91 lbf.ft) 12,2 daN.m(90,17 lbf.ft)