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Publication 4991460001 (May 2000)
Dipstick and
oil filler tube
5.4 Relief Valve.
A relief valve is fitted into the discharge pipework and its operation should be checked at
regular intervals This can be achieved by the follwing procedure:
• Fit a gate valve and pressure gauge into the discharge air pipework downstream of the
relief valve.
• Start the compressor with the gate valve open and bring the compressor up to speed.
Slowly close the gate valve and check that the pressure on the on the gauge does not
exceed the pressure setting of the relief valve.
• When the 'crack' pressure is reached, close the gate valve completely and observe the
reading on the gauge when the valve reaches full by-pass, (This reading should match the
setting that is stamped on the hexagon at the base of the valve).
• If the reading exceeds 0.2 bar above the set pressure, the relief valve is defective, and
the test procedure must be stopped immediately. The valve must be replaced before
running the compressor again.
Slowly open the gate valve and stop the compressor.
This procedure should be carried out every three months to clear the valve
seat and check the valve is functional. (Ear Protection is recommended).
L
H
5.3 Refilling and checking the oil level.
To change the oil first drain the machine as described in section 5.2 then remove the 4
dome nuts and washers securing the top GRP cover. Remove the combined oil filler/dip-
stick and pour approx 1.75 litres of replacement oil (Refer chart on this page for recom-
mended oils) through the oil filler tube. Check oil level after allowing to settle, do not allow
oil level to be above the maximum mark on the dipstick.(Fig 10)
Air filter element
and clamp disc
Fig 10
ALPHASYN T220
REDUCTELF SYNTHESE 220
SHELL TIVELA WB
GLYGOYLE 30
BURMAH CASTROL
ELF OIL
SHELL OILS MOBIL OILS
RECOMMENDED OILS
Gearbox oil suitability chart - Gearbox capacity 1.75 litres - ISO 220 (SAE 90) Synthetic oil