22.3
MAINTENANCE
INSTRUCTIONS
GRU FASSI
22.3 After every 8 working hours or at the end of every
working day
-
Check that all safety devices are efficient.
-
Check the level of the hydraulic oil in the tank.
-
Check all the components of the hydraulic circuit for possible leaks.
-
Check that the control and the oil diverter levers can easily be positioned;
they must show no signs of forcing.
-
Check the condition of shackles, hooks, wire ropes and any other lifting equipment.
22.4 After every 40 working hours or atfter every
working week
Check the tightening torque of the fixing rods of the crane (fig. 30).
See table at paragraph 22.5
Clean the oil filter placed in the oil tank of the crane and if any, on the pump sec-
tion and pressure hoses.
NOTE The filters of fibre or paper can not be cleaned, they must be replaced.
Cleaning of the wire mesh filter on the tank (oil return to the oil-tank) fig. 31.
-
Unscrew the security bolts of the filter cover 1 and remove it.
-
Extract the cartridge, clean by flushing with a non flammable, non corrosive
and non toxic solvent (gas oil or other). Thoroughly dry the filter inside and out
(do not use compressed air).
-
Check if the cartridge has collapsed; if so, replace it!
-
Remove the filter body 3 and clean it.
-
Re-assemble the filter body and the cartridge: check the sealing of the ‘O’ ring
4-5-6; in case, replace it!
NOTE Take care that no contaminated material passes into the tank.
Replacement of the filter on the delivery line (before the distributor) fig. 32.
-
When the visual indicator becomes red, replace the cartridge.
-
Unscrew with a suitable spanner the filter body (1) from the head (2).
-
Remove the cartridge (3) and clean inside the holder (1).
-
Insert a new cartridge and re-assemble the filter body into the head checking
the seal (4).
Check the oil level in the tank with the crane in the folded position and with the
outriggers (crane and supplementary) fully re-entered. The oil level must not
exceed the maximum or be lower than the minimum (fig. 33).
Top up using hydraulic oil with the same characteristics as those indicated in the
table at paragraph 23.
The following lubricators have been centralized and gathered in a case (fig. 33a)
positioned on the base (crane distributor side):
-
rack guide shoe - rotation,
-
upper and lower bush of the column - column support,
-
rack group - column gear,
-
column support group - pendulum beam.
(!) WARNING (!)
At low temperatures, the grease shall not crystallize or, to be more precise, shall
not change its characteristics. At the effective operative temperature, the grease
we recommend shall have a fluidity at least equal to rating NLGI 0 or max. 1.
(!) WARNING (!)
Centralized lubrication shall not be used when room temperature is below -
10°C / -20°C.
All the lubricators mounted on the crane are protected by a plastic cap so to avoid
the oil contamination.
fig. 30
fig. 31
MAX
MIN
fig. 33
fig. 32
fig. 33a
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