Ariel Heavy Duty Balanced Opposed Compressor JGQ/1

Remove the coupling and the coupling adapter

Remove the top cover and crankshaft seal housing

Detach the connecting rods and move them to their full outer position

Remove the cap screws on the chain adjustment cap, loosen the chain and remove the force feed lubricator

Remove the cap screws from the main bearing caps and pull the caps straight up

Prepare wooden saddles or a notched wooden crate for storing the crankshaft during maintenance

For horizontally opposed models, turn the crankshaft so that the drive end counterweight is straight up and lift the crankshaft

NOTE: THE LOWER HALF BEARING SHELLS SOMETIMES HAVE A TENDENCY TO STICK TO THE SHAFT JOURNALS BECAUSE OF THE CLOSE FITTING OILY SURFACES OF THE TWO PARTS.

Safety First! Ensure the compressor is shut down and the gas system is vented before starting.

Fastener torque on gas nozzle flanges, valve caps, cylinder heads and compressor rod packing flanges checked and confirmed?

If fasteners turned at the first month check, they should be re-checked after the second month or 1300 hours. If loosening persists, consult your packager or Ariel.

Safety shutdown functions checked and confirmed?

Upload the frame oil sample analysis report

If the oil analysis results indicate, change oil. If an oil analysis indicates lead, tin or copper particles in the oil, check main, connecting rod and crankshaft-thrust bearing clearances.

Bearing clearances checked and within limits?

If bearing clearances are outside of the limits, replace the affected bearings.

Sign off on the compressor maintenance

Warning: This procedure requires trained personnel with PPE!

CAUTION: DO NOT TOUCH COLD SURFACES WITHOUT PROPER INSULATION TO PREVENT INJURY.

NOTE: ABSOLUTE CLEANLINESS IS REQUIRED. ASSEMBLY MUST BE IMMEDIATE SO THAT THE BEARING DOES NOT WARM-UP AND STICK BEFORE IT IS IN PLACE.

NOTE: REPLACE ONE MAIN BEARING AT A TIME.

Followed instructions in 'CAUTION' on Page 5-2. Removed coupling spacer or otherwise lockout.

Removed the cap screws from main (journal) bearing cap #1.

Attached clean nylon lifting straps around the crankshaft.

Removed the shell from the main bearing cap.

Warning: Consult the Packager’s instructions regarding where to set the VVCP.

Refer to the VVCP data sheet in the Ariel Technical Manual Parts Book.

VVCP piston ring is not gas tight

If gas is trapped behind the piston, the VVCP can be adjusted when the cylinder is pressurized, but difficult to turn when cylinder is vented.

VVCP can be adjusted when the cylinder is pressurized

This problem is corrected by disassembling the VVCP and cleaning.

To adjust volume, loosen stem locking handle (or locknut), so that stem is free to turn.

Stem locking handle (or locknut) loosened

Warning: Ensure all power to the Unit is shut off and the system is vented of gas before servicing.

After running a new compressor (or after a re-location, re-configuring or major overhaul) for the first 24 hours, shutdown, vent gas system and perform a hot alignment check at coupling within 30 minutes, while barring driver shaft to packager’s recommendations.

Realign if necessary to hold coupling hub face and rim hot alignment within 0.005 inch (0.13 mm) TIR, except for hub O.D. >17 in. (>43 cm) angular hub-face limit is increased to 0°1’ (0.0167°).

Check fastener torque on gas nozzle flange, valve cap, cylinder head, compressor rod; packing flange and, if applicable, crosshead guide to frame bolting.

If bearing temperatures increase or a visual inspection of the crankcase indicates bearing wear, check main, connecting rod and crankshaft-thrust bearing clearances.

Replace affected bearings if clearances are out of tolerances.

Check frame oil pressure. It should be 50 to 60 psig (3.5 to 4.2 barg) when at operating temperature.

Check frame oil level. It should be visible in the sight glass and approximately mid-level when running, if not, determine and correct cause.

Check lubricator block cycle time. Refer to information plate on top of lubricator box for correct cycle time.