Ariel Heavy Duty Balanced Opposed Compressor JGN/2

Loosen all cylinder heads completely vented

Remove crosshead guide side covers

Remove the cylinder head (or VVCP)

Turn the crankshaft to position the crosshead to near its inner dead center position and back off, but do not remove, the crosshead-balance nut set screws

Turn the crosshead-balance nut off the piston rod, while removing the piston and rod assembly

Turn the crankshaft to position the crosshead near to its outer dead center position, remove the crosshead pin through bolt, lock nut, end-plates and pin

Turn the crankshaft to near the inner dead center position. Move the crosshead to its outer dead center position to be free of the connecting rod

Rotate the crosshead 90 degrees and remove it through the guide opening

Check the crosshead pin to crosshead/bushing clearance

Check crosshead pin to crosshead pin bore and connecting rod bushing bore by removing crosshead pins.

Check for excessive wear in the auxiliary end drive chain tightener.

Check for excessive ring groove wear in pistons.

Sign off on the compressor maintenance

CAUTION: TO PREVENT PERSONAL INJURY, BE SURE THAT COMPRESSOR CRANKSHAFT CANNOT BE TURNED BY THE DRIVER OR COMPRESSOR CYLINDER GAS PRESSURE DURING MAINTENANCE

ON ENGINE-DRIVEN COMPRESSORS, REMOVE THE CENTER COUPLING OR LOCK THE FLYWHEEL.

ON ELECTRIC MOTOR-DRIVEN COMPRESSORS, IF IT IS INCONVENIENT TO DETACH THE DRIVER FROM THE COMPRESSOR, THE DRIVER SWITCH GEAR MUST BE LOCKED OUT DURING MAINTENANCE.

BEFORE PERFORMING ANY MAINTENANCE, COMPLETELY VENT SYSTEM.

BEFORE REMOVING A CYLINDER HEAD OR VVCP, BACK OFF ALL CAP SCREW 1/8 INCH (3 mm). MAKE SURE THE HEAD IS LOOSE AND THE CYLINDER OR VVCP IS COMPLETELY VENTED.

Follow steps 1. through 5. at “Crosshead - Removal” on page 5-11.

With the cylinder head/unloader removed and the cross-head balance nut loosened, use the piston turning/piston nut torquing tool (Ariel furnished tool) and a speed wrench to screw the piston and rod assembly out of the crosshead.

As the piston leaves the cylinder, be careful in handling the piston rings. Despite their toughness in service, rings are fragile with regard to removal.

Slide the piston rod out of the head end. The threaded crosshead end of the rod is 1/8 inches (3 mm) smaller in diameter than the inside diameter of the packing.

Remove the cap screws from the drive chain eccentric adjustment cap and rotate cap to loosen the chain

After removing the chain from the lube sprocket, remove the sprocket set screw and sprocket. Detach all tubing to the lubricator

Remove the four mounting bracket cap screws and remove the lubricator

With the lubricator on the bench, remove the Woodruff Key from the shaft and file the shaft to remove any burrs raised by the cup point of the set screw. Install a new O-ring

Install a new No. 204 Woodruff Key after first checking to make sure the key will fit into the new sprocket. If it is too thick, it can be polished with an emery cloth on a flat surface until it can easily slide into the slots for a snug fit. If the key is too high, file of the top edge for a snug fit

After the new key has been installed and it has been determined that the new sprocket will fit, oil the new O-ring and remount the lubricator on the frame

Put the new sprocket onto the shaft

Check alignment to the crankshaft drive sprocket with crankshaft centered in end play, using a straight edge, to within 1/32 inch (1 mm). Tighten the set screw

Warning: This maintenance check requires trained personnel with PPE!

VVCP packing assembly spring depressed and snap ring removed?

VVCP packing replaced when excessive leakage is noted at the vent?

VVCP piston ring removed and replaced as necessary?

All parts cleaned to remove all debris, rust, etc.?

VVCP packing placed between two flat surfaces and tapped with hammer to relax the packing elements prior to assembly?

VVCP reassembled in reverse order, lubricated and new O-ring installed at the bolt flange between the two-halves?

Stem lubricated with three to four pumps of all-purpose petroleum grease with a hand pump grease gun at the grease fitting?

VVCP re-installed on the cylinder with a new head gasket?