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Section 1 Maintenance
SCC1000C Crawler Crane — Maintenance Manual
CAUTION
-- Only nitrogen can be used to charge the
accumulator� If the value of the pressure
is found reduced significantly (about
60%) in initial check, it is required to
check the accumulator again after about
3-4 weeks� If at that time the pressure
value keeps reducing, the accumulator
should be replaced�
-- Only nitrogen can be used to fill the
accumulator� Pressure reducer (5) should
be installed on the nitrogen cylinder (4)�
-- The accumulator can be repaired only by
t h e m a n u f a c t u r e r o r a w o r k s h o p
approved by the manufacturer�
-- The repaired accumulator should be
checked and accepted by approved
experts�
-- A new inspection certificate should be
issued for the accumulator�
escapes at the connector nut, pressure of the
system is successfully reduced.
3. Remove protective cap (1) on air valve of
accumulator (2) and install the lling and testing
device (3).
4. Open the air valve after the filling and testing
device is screwed on and read out pressure
increase value on the pressure gauge of the
testing device.
The pressure of the accumulator: Rexroth hydraulic
system 15 bar (218psi), Kawasaki hydraulic system
16 bar (232psi).
5. If the pressure is not enough, it is required to ll
nitrogen into the accumulator through the lling
device (3) to reach relative pressure.
6. After initial lling, wait for 2~3 minutes and then
check the pressure, rell when necessary.
-- To check original pressure inside the air bag, it is
required to use a lling and testing device. The
crane’s hydraulic system uses a membrane
accumulator or airbag accumulator to be filled
with nitrogen gas. They are located on the
platform.
-- Only when the accumulator is installed and lled
with proper pressure can its relative parts run
normally.
-- It is necessary to check original pressure value
regularly.
-- When filling the accumulator to get an initial
pressure, check the pressure gauge at the
testing joint.
-- If pressure in the corresponding hydraulic loop
does not increase accordingly when boosting
pressure for the accumulator, it indicates that the
membrane inside the accumulator is defective.
The accumulator must be replaced.
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