Haulotte Group HA120PX, Книга по эксплуатации

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48 4000599070 E11.16 USA / GB
HA120PX
C
- Maintenance
7.3.3.3 - Evaluation of leaks on hydraulic cylinders
These measures must be taken each time an anomaly has been detected in the hydraulic
cylinder during daily inspection and periodic maintenance checks.
Generic Control :
• Position a load equal to the rated capacity on the cage (or platform).
• Raise the cage (or the platform) using the ground control box. To activate the cylinder to be tested,
proceed as follows :
• Lift Arm hydraulic cylinder : Lift the arm to approximately half full height. The telescopic boom should
be fully extended and in the horizontal position. (For machines fitted with).
• Boom lifting cylinder or Jib cylinder : Lift the concerned equipment (boom or jib) of approximately half
way. Extend the telescope to its maximum.
• Telescoping cylinder : Lift the boom to its maximum angle and telescope approximately 50 cm.
• Measure the distance between the floor of the cage (or of the platform) and the ground.
• Leave the machine in this condition for 15 mn (minutes).
• Measure the distance between the floor of the cage (or of the platform) and the ground.
• If the difference between two measurements does not exceed 4 cm : the test validates correct
operation.
• If the difference between two measurements exceeds 4 cm, contact HAULOTTE Services® or carry
out the additional tests described below.
Control cylinder by cylinder :
• Position a load equal to the rated capacity on the cage (or platform).
• Perform the movement of the concern cylinder to half of its stroke.
• Fix the cylinder with a comparator :
• Attach the body of the comparator on the cylinder rod.
• The needle of the comparator must be in contact with the end of the casing of the cylinder.
• The target is to measure the creep of the cylinder rod.
• If the creep of the cylinder rod is higher than the values indicated in the table below, replace the
cylinder.
Type of cylinders Maximum drift authorised due to an internal leak of the cylinder
Lift cylinder arm or boom (Machine with
working heights > 26 m(85 ft4 in))
After 10 mn, creep < 0,2 mm After 60 mn, creep < 1 mm
Outriggers cylinder, Oscillating axle locking,
Lift cylinder arm or boom (Machine with
range-limiting system)
After 10 mn, creep < 0,5 mm After 60 mn, creep < 2,5 mm
Lift cylinder arm or boom, Telescoping,
Compensation, ...
After 10 mn, creep < 1 mm After 60 mn, creep < 6 mm
Steering cylinder After 10 mn, creep < 1,5 mm After 60 mn, creep < 9 mm