Heavy Duty Balanced Opposed Compressors - Ariel Corporation
Heavy Duty Balanced Opposed Compressors - Ariel Corporation
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