WÄRTSILÄ RT-flex50-D, Maintenance Manual

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Maintenance
5610−1/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
1/ 4
Tool: Key to Illustrations:
1 Case (for CLU4−C) 94720c 1 Hydraulic accumulator 9 Pressure reducing valve
consisting of:
2 Protection cap 10 Pressure transmitter
measurement set complete 3 Pressure reducing valve 11 Cable socket
for checking / refilling of 4, 4a Hose (1m, 4 m) 12 Pressure gauge
hydraulic accumulator 5 Control unit with 13 Screw plug
valves A, B and C 14 Valve
7 Pressure gauge 0−60 bar 15 Nitrogen bottle
8 Valve block
1. Checking the gas pre-charge pressure
Once filled with gas, the hydraulic accumulator is largely maintenance-free, how-
ever in order to ensure a trouble-free service, maintenance works must be carried
out according to the manufacturer’s detailed operating instructions of the Cylinder
Lubricating System. Checks and maintenance are only to be carried out, when
the engine is at standstill.
The same measurement set 94720c must always be used to refill the accumulator
as provided for checking the gas pre-charge pressure on the lubricating pump’s
hydraulic actuators (see also 7218−1).
Check the filling pressure at least once in the first week after startup of the accumu-
lator. If no loss of gas is observed, recheck after three months. If there is still no
change in pressure, an annual check might be sufficient, however, it is recom-
mended to continue carrying out checks every three months.
Attention! Ensure that servo oil supply is shut off before starting accumulator
pressure checking and charging. Also no residual oil pressure in valve block must
be visible on pressure gauge 12 (PI2041L) of pressure reducing valve 8.11−1.
1.1 Preparation
− Stop servo oil supply.
− Close valve 14 on pressure reducing valve 8.11−1 in the rail unit (Fig. ’D’).
− Drain servo oil system by means of screw plug 13.
Screw plug 13 must remain open during entire checking / refilling proce-
dure.
− Remove protection cap 2 from accumulator 1.
1.2 Checking procedure
⇒
Close the three valves A, B and C on control unit 5.
⇒
Connect accumulator 1 to control unit 5 using short hose 4.
⇒
Open valve A and read pressure from gauge 7.
Required gas pressure: min. 30 bar / max. 35 bar.
If gas pre-charge pressure is ok:
⇒
Close valve A and drain remaining pressure in control unit by opening valve B.
⇒
Disconnect short hose from accumulator.
⇒
Refit protection cap.
Remark: During every check a small amount of gas may be lost to the atmo-
sphere. Therefore, make sure a gas bottle is available before a pressure check is
made in order to refill possible loss.
If gas pre-charge pressure is not ok:
⇒
Refill the accumulator.
Pressure Reducing Valve 8.11−1
Checking the Gas Pre-charge Pressure
2011
CHECK