Heavy Duty Balanced Opposed Compressors
Heavy Duty Balanced Opposed Compressors
Heavy Duty Balanced Opposed Compressors
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FOR MODELS: JG AND JGA SECTION 5 - MAINTENANCE<br />
VVCP - Variable Volume Clearance Pocket Head End<br />
Unloader<br />
Removal<br />
Disconnect the VVCP packing vent. Remove the VVCP from the cylinder using similar procedures<br />
as when removing a cylinder head. The approximate weights of VVCP’s for handling<br />
purposes can be found in the Ariel Data Book.<br />
Disassembly<br />
Unsnap the thread protector bellows from the slot in the hand wheel. With the locking handle<br />
locked, remove locknut and hand wheel. A hammer or puller may be required to break hand<br />
wheel to stem tapered fit. Loosen locking handle and unscrew to remove handle. Remove<br />
socket head screws at inside of bolt flange and separate the halves of the VVCP. Unscrew<br />
the VVCP stem and piston assembly to remove.<br />
Maintenance<br />
!<br />
CAUTION<br />
TRAPPED GAS PRESSURE CAN PRESENT A PERSONAL<br />
SAFETY HAZARD WHEN SERVICING THE VVCP. WORK IN A<br />
WELL VENTILATED, NON SPARKING AREA. DO NOT<br />
BREATHE GAS OMMITTED FROM VVCP WHEN VENTING<br />
TRAPPED GAS.<br />
To replace or clean the VVCP packing, remove the bolts and flange that hold the packing in<br />
place and remove the packing. Replace the VVCP packing when excessive leakage is noted<br />
at the vent. Remove the VVCP piston ring; replace as necessary.<br />
Clean all parts to remove all debris, rust, etc. The stem and piston are permanently pinned,<br />
do not attempt to disassemble.<br />
Reassemble the VVCP in reverse order, using a new O-ring at the bolt flange. While the<br />
torque used for the socket head bolting is not critical, these bolts must be sufficiently tight to<br />
prevent loosening during service. Be sure that thread protector bellows are properly aligned<br />
when installing hand wheel. Lubricate stem with 3-4 pumps of all-purpose petroleum grease<br />
with a hand pump grease gun at the grease fitting.<br />
To re-install the VVCP on the cylinder, use a new head gasket. Lubricate threads and bolting<br />
seating surfaces with petroleum type lubricant and install bolting. Tighten each cap<br />
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