Maintenance
7218−1/A2
RT-flex58T-E
Winterthur Gas & Diesel Ltd.
1/ 4
Tool: Key to Illustrations:
1 Case (for CLU4−C) 94720C 1 Hydraulic accumulator 8 Lubricating pump (CLU4−C)
consisting of: 2 Protection cap 9 4/2-way solenoid valve
measurement set complete 3 Pressure reducing valve 10 Shut-off valve servo oil
for checking / refilling of 4, 4a Hose (1m, 4 m) 11 Venting valve servo oil
hydraulic accumulator 5 Control unit with 12 Venting valve lube oil
valves A, B and C 13 Screw plug
7 Pressure gauge 0−60 bar 14 Nitrogen bottle
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. Furthermore see also Operating Manual 7218−1.
Check the filling pressure at least once in the first week after start-up of the accu-
mulator. 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 the servo oil sup-
ply line must be visible on pressure gauge PI2041L of pressure reducing valve
8.11−1.
1.1 Preparation
− Stop servo oil supply.
− Close stop valve 4.30−5 on servo oil rail 4.11 (Fig. ’D’).
− Drain servo oil system on screw plug 13 of pressure reducing valve 8.11−1
(Fig. ’E’).
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.
Lubricating Pump CLU4−C
Checking the Gas Pre-charge Pressure
CLU4−C / 2013
CHECK
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