Service Guides

Step-by-step rebuilds and PM procedures.

AirCompDX - Field Reference for Air Compressor Techs
Disclaimer:Field reference for trained technicians only. Not a substitute for OEM service manuals or applicable codes. Always verify procedures and torque/pressure values against current manufacturer documentation. Use at your own risk — AirCompDX disclaims all warranties and liability.
Reciprocating
Single-stage recip pump rebuild
Top-end rebuild on a single-stage reciprocating pump: valves, rings, gaskets, and break-in.
Intermediate · 3–4 hr
Two-stage recip pump rebuild
HP + LP cylinder rebuild on a two-stage pump including intercooler service and stage balance.
Advanced · 5–6 hr
Valve plate / reed valve service
Diagnose and replace reed and disc valves — the #1 cause of lost CFM on recip pumps.
Basic · 1.5 hr
Rotary Screw
Rotary screw airend major PM
Coupling, shaft seal, inlet valve service, and bearing inspection on a lubricated rotary screw airend.
Advanced · 6–8 hr
Air/oil separator change
Replace the separator element and restore proper carryover and ΔP on a lubricated screw.
Intermediate · 1.5 hr
Scroll / Oil-less
Scroll tip-seal replacement
Replace scroll tip seals and inspect orbit on an oil-less scroll pump.
Intermediate · 2 hr
Oil-less recip pump rebuild
PTFE ring, cup, and bearing service on small oil-less reciprocating pumps.
Intermediate · 2 hr
Vacuum
Rotary vane vacuum: oil + vane service
Oil change and vane inspection on a lubricated rotary vane vacuum pump.
Basic · 1.5 hr
Controls & Electrical
Unloader + pressure switch service
Diagnose and replace pressure switches and pilot unloaders on tank-mounted recips.
Basic · 1 hr
Check valve + safety relief test
Replace the tank check valve and proof-test the ASME safety relief valve.
Basic · 45 min
Magnetic starter + overload service
Inspect and set NEMA / IEC starters and thermal overload relays.
Intermediate · 45 min
Air Treatment
Refrigerated dryer PM
Condenser clean, drain test, and dewpoint verification on a refrigerated dryer.
Basic · 1 hr
Desiccant dryer PM
Desiccant inspection, valve/muffler service, and purge tuning on a heatless twin-tower.
Intermediate · 2 hr
PM & Commissioning
Belt and sheave alignment
Tension, align, and replace V-belts on belt-drive recip and screw compressors.
Basic · 1 hr
Oil change + new-pump break-in
Crankcase oil change and break-in procedure for a new or rebuilt recip pump.
Basic · 45 min
Intake filter PM
Inspect and replace intake elements and check intake restriction.
Basic · 20 min
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