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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE<br />

Piston and Rod - Removal<br />

FIGURE 5-25 FENNER DRIVE COUPLING<br />

!<br />

CAUTION<br />

TO PREVENT PERSONAL INJURY, BE SURE THAT COMPRESSOR CRANKSHAFT<br />

CANNOT BE TURNED BY THE DRIVER OR COMPRESSOR CYLINDER GAS PRES-<br />

SURE DURING MAINTENANCE: -- ON ENGINE-DRIVEN COMPRESSORS, REMOVE<br />

THE COUPLING CENTER MEMBER OR LOCK THE FLYWHEEL. -- ON ELECTRIC<br />

MOTOR-DRIVEN COMPRESSORS, IF IT IS INCONVENIENT TO DETACH THE<br />

DRIVER FROM THE COMPRESSOR, THE DRIVER SWITCH GEAR MUST BE<br />

LOCKED OUT DURING MAINTENANCE.<br />

BEFORE PERFORMING ANY MAINTENANCE, COMPLETELY VENT SYSTEM.<br />

BEFORE REMOVING A CYLINDER HEAD OR VVCP, BACK OFF ALL CAP SCREWS<br />

1/8 INCHES (3 mm). MAKE SURE THE HEAD OR VVCP IS LOOSE AND THE CYLIN-<br />

DER IS COMPLETELY VENTED.<br />

1. For non-lube cylinders, reference “Cleaning, Handling and Thread Lubricants for<br />

Non-Lubricated Compressor Cylinders” on Page 5-66.<br />

2. Remove the crosshead guide side covers and gaskets. Loosen the cylinder<br />

head or VVCP cap screws to the Caution above.<br />

3. Manually rotate the crankshaft to move the crosshead to near its inner dead<br />

center position. Back off, but do not remove, the crosshead-balance nut set<br />

screws. Loosen the crosshead-balance nut with the hydraulic crosshead-balance<br />

nut torque tool (G-12645) and appropriate pump, see Figure 5-10 on Page<br />

5-16. Ref to “Crosshead - Removal” on Page 5-9 for the proper use of the tool.<br />

4. Remove the cylinder head or VVCP. In the case of tandem cylinders where the<br />

outboard cylinder bore is smaller than the inboard bore, it is necessary to<br />

remove the outboard cylinder. Support such cylinders during removal and installation,<br />

as to not put excessive weight on the piston and rod assembly which<br />

might cause bending.<br />

5. Use the <strong>Ariel</strong> furnished Piston Turning Tool (B-3472) to unscrew the piston-rodassembly<br />

out of the crosshead, see Figure 5-28 on Page 5-40. The two dowels<br />

on the tool fit the holes in the piston nut. Turn the crosshead-balance nut off the<br />

PAGE 5 - 36 7/09

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