Gardner Denver Screw Compressor L29

Inspect solenoid valves /vacuum switch operation, replace if necessary.

Inspect blow-down valve operation, replace if necessary.

Inspect thermistor probes operation, replace if necessary.

Inspect pressure transducer, replace if necessary.

Inspect control valves and pressure regulator, replace if necessary.

Inspect thermal mixing valve operation, replace element if necessary.

Inspect, replace if necessary the drive coupling spider (coupling element).

Inspect hoses, replace if necessary.

Sign off on the compressor service check

1. An oil sample will need to be taken and sent to the GD oil lab.

2. Replace cool air inlet filter pad.

Clean/replace cool air intake and control box filter pads

Only perform checks and carry out work on the screw compressor when the unit is out of operation, depressurized, and secured from being switched on again!

Replace the filter pad as follows:

• Remove the mounting screws (- 2 - Fig. 28).

• Remove and clean the filter pad (- 1 - Fig. 28). If there is damage, replace.

• Place the filter pad back in the acoustic gate (- 3 - Fig. 28).

DANGER: Only perform checks and carry out work on the screw compressor when the unit is out of operation, depressurized, and secured from being switched on again!

NOTICE: Never operate the screw compressor system without an air filter (even briefly removing it can cause considerable damage to the machine)!

Check the air filter at least once a week and possibly daily for dust accumulation.

When performing maintenance, take care that no dirt makes its way to the clean air side of the air filter.

Operating conditions (e.g., coolant temperatures), the type of operation and the quality of the intake air (e.g., dust content, ratio of gaseous foreign substances such as SO2 and solvent vapors, etc.) have a strong influence on the filter lifespan (air filter, oil filter, fine separator).

In these cases the intervals between changes may be shorter.

Switch off the screw compressor unit, secure it against an accidental restart.

Pull the snap hooks outward and take off the housing cover.

Carefully pull out the filter foam and air filter elements.

DANGER: Air/oil under pressure will cause severe personal injury or death.

Shut down the compressor, relieve the system of all pressure, disconnect, lockout and tagout the power supply to the compressor package before removing valves, caps, plugs, fittings, bolts and filters.

CAUTION: Fire hazard and slip hazard! Do not spill any oil! Look for leaks! Immediately take care of any spilled oil!

NOTICE: Do not mix oils with different specifications.

If the compressor system is delivered without oil, oil must first be filled into the pressure reservoir up to the “maximum oil level” mark.

Shut off the compressor with the STOP button.

Wait at least 5 minutes until the oil has settled, i.e. until the air has bubbled out.

Check the oil level using the transparent plastic tube on the pressure reservoir.

The oil level must lie between the “maximum oil level” and “minimum oil level” marks on the oil container.

Visually check for leakage on the shaft seal

Replace lubricant every 8000 hours

DANGER: Air/oil under pressure will cause severe personal injury or death.

CAUTION: Fire hazard and slip hazard!

NOTICE: Dispose of the fine separator properly - it is hazardous waste!