Servicing Procedures; Air Filter (Af-Figs. 1.1/1.4); Oil And Oil Filter Change (Fig. 3.4); Safety Valves - Atlas Copco ZT55-ZT75-ZT90 Instruction Book

Instruction book

5 SERVICING PROCEDURES

5.1 Air filter (AF-Figs. 1.1/1.4)

1. Stop the compressor and switch off the voltage to the compressor. Remove the filter.
2. Fit the new filter.
3. After carrying out the service actions of the related service plan, the service warning must be reset.
See also section 4.1.

5.2 Oil and oil filter change (Fig. 3.4)

1. Run the compressor until warm.
2. Press stop button (9-Fig. 1.12), wait until the compressor has stopped, press emergency stop button
(S2-Fig. 1.12) and switch off the voltage to the compressor.
3. Remove filler plug (FC). Drain the compressor sump by opening valve (Dmo). Close the valve after
draining. Drain the oil cooler by removing the drain and vent plug.
On ZT, drain the oil from the compressor elements by removing their yellow-painted drain plugs.
4. Remove the oil filter (OF). Clean the filter seat, oil the gasket of the new filter and screw it into place
until the gasket contacts the seat. Then tighten by hand.
5. Fill the compressor sump to the middle of the oil level sight-glass (SG) with oil as specified in section
4.3. Reinstall the filler plug.
6. Switch on the voltage. Unlock the emergency stop button.
7. Run the compressor for a few minutes. Stop the compressor. If necessary, top up the gear casing
with oil to the middle of the sight-glass (SG).
8. After carrying out the maintenance operations of the related service plan, the service warning must be
reset. See also section 4.1.

5.3 Safety valves

Testing
The valves can be tested on a separate compressed air line. If a valve does not open at the pressure
specified in section 7.2, consult Atlas Copco.
Warning
Never run the compressor without safety valves.
No adjustments are allowed.
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