94
15. Pressure and Temperature Switches
Monthly. See that pressure switches cut in and out at proper pressures. Check setting of temperature
switches.
switches.
Annual. Check and clean switch contacts. Check switch calibration and set points. Clean and adjust
moving parts.
moving parts.
16. Unloader
Monthly. Check that compressor is not being loaded until operating speed is reached in starting and that it
unloads at the proper pressure.
unloads at the proper pressure.
Annual. Inspect valves and air lines for leaks and valves for proper seating. Lap valves if required.
Examine solenoid for deteriorated insulation or loose connections.
Examine solenoid for deteriorated insulation or loose connections.
17. Bearings
Weekly. Check antifriction bearing for excessive vibration or noise and schedule replacement as required.
Check for adequate lubrication.
Check for adequate lubrication.
Not Scheduled. Disassemble compressor and inspect condition of all bushings and babbitt-lined bearings.
Repair or replace as required.
Repair or replace as required.
Reciprocating Compressors
18. Lubrication
Weekly. Check that oil or grease cups are full and that crank case oil is at proper level. Replace or add the
correct lubricant to bring to proper levels in crankcase or oil reservoir. Check oil feed rate to cylinder.
Check forced oil systems for proper operation. Note any leaks and repair if excessive.
correct lubricant to bring to proper levels in crankcase or oil reservoir. Check oil feed rate to cylinder.
Check forced oil systems for proper operation. Note any leaks and repair if excessive.
Annual. Clean oil or grease cups and piping. Check condition of lubricant and change if required. Repair
any leaks.
any leaks.
19. Packing Gland
Weekly. Check for excessive leakage and for scoring on piston rod. Adjust packing as necessary.
Annual. Replace packing as necessary.
20. Crosshead
Weekly. If visible, check fit and lubrication.
Annual. Check bearing shoes for scoring and wear and fit to crosshead. Shim shoes if necessary to obtain
proper fit. Check pin and bushing for wear and replace or refit as required.
proper fit. Check pin and bushing for wear and replace or refit as required.