F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
1 - D
ESIGN
S
PECIFICATIONS
& D
ATA
PAGE 1-5
Opposed Throw - Reciprocating Weight Balancing
Ariel recommends that the reciprocating weight differential between opposing throws be
1.0 pound (0.45 kg) or less for JGM:N:P:Q compressors. JGI compressors are not balanced.
If replacing any major reciprocating component, that is; a connecting rod assembly, piston,
piston & rod assembly, crosshead-balance nuts or crosshead, weigh component parts on a
calibrated scale to 0.1 pounds (0.05 kg) and compare to the Compressor Balancing Record
sheet that comes in the parts manual with each compressor. If there are weight changes,
recalculate opposing throw reciprocating weight differentials. If not within the recommended
limit, new balance nuts and/or crossheads are to be selected to provide the least possible
differential.
If it is desirable to exchange opposing throw compressor cylinder locations, all reciprocating
components must be exchanged to the opposite throw, except the connecting rod
assemblies. Check the Balancing Record sheet and recalculate reciprocating weight
differential, with the connecting rod weights included. If not within the recommended limit,
new crosshead-balance nuts are to be selected to provide the least possible differential.
If opposing throws can not be balanced within the recommended reciprocating weight
differential limit, contact your packager and/or Ariel. When applying or re-applying a different
cylinder to a throw, the opposing throw reciprocating weight differential must be re-calculated
and new balance nuts or crossheads may be required. The force feed oil distribution system
may also need to be resized.
Contact your Packager or the Ariel Response Center for detailed information, if reciprocating
weights change and exceed the recommended reciprocating weight differential between
opposing throws, when exchanging opposing throw compressor cylinder locations or when
applying or re-applying a different cylinder to a throw. Refer to the last page of this manual for
contact information
