Dynapac CA 251, Руководство по обслуживанию

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20 CA 251 M251-1EN1
Loosen the breather filter on top of the reservoir so that
pressure inside is eliminated.
Remove the hydraulic filters (1), (2) and (3) and scrap
them. They are of the expendable type and cannot be
cleaned.
Ensure that the old gaskets do not remain on
the filter holders. Leakage may otherwise
occur between the new and the old gaskets.
Thoroughly clean the sealing surfaces of the filter
holders.
Apply a thin coat of fresh hydraulic fluid on the new
filter gaskets.
Tighten the filters by hand.
First screw on until the filter seal lies against
the filter holder. Then screw a further half turn.
Do not tighten the filter too hard, it could
otherwise damage the gasket.
Start the engine and ensure that there is no leakage of
hydraulic fluid from the filters.
Ensure that ventilation (extraction) is
adequate if the engine is run indoors. (Risk
of carbon monoxide poisoning).
Check the fluid level in the sight glass (4) and top up as
required.
2
3
1
4
Fig. 36 Hydraulic reservoir
1. Suction filter, propulsion
2. Suction filter, vibr.
3. Return filter, cooling circuit
4. Sight glass
Hydraulic filter – Replacement
EVERY 500 HOURS OF OPERATION (EVERY THREE MONTHS)
Check all rubber elements (1), replace all of the
elements if more than 25% of them on one side of the
drum are cracked deeper than 10–15 mm (0.39–0.59 in).
Use the blade of a knife or pointed object to assist
when checking.
Ensure that the fastening screws (2) are tightened.
With a calliper gauge, measure the length of
the rubber element including the mounting
plates. See separate workshop instructions if
the size is more than 76 mm (3 in).
Fig. 35 Drum, vibration side
1. Rubber element
2. Fastening screws
2
1
Rubber elements and fastening
screws – Check
Max 76 mm (3 in)
EVERY 250 HOURS OF OPERATION (MONTHLY)