2200LZJE-HO-C6-N_2013.12.
Chapter 5 Maintenance
Compound 2-stage Screw Compressor 2016**C 5.6 Overhaul
5-23
c) The upper side unloader cylinder 【60-2】 is, likewise, fastened by using two hexagon socket head
cap screws 【61】 and six hexagon socket head cap screws 【62-2】. Pull out the unloader cylinder
in the same way as described in b) above. If, after disassembly of the cylinder portion, further
process of disassembly has to be done, leave the two screws 【61】 fastened as they are and
remove the bolts 【62-2】 and bolts 【24】 that fasten the balance piston cover, so that the unloader
cylinder can be removed as a unit, combined with the balance piston cover. At this moment, there is
oil accumulated at the balance piston and side bearings. So pay attention to the oil that will flow out
when removing the balance piston cover. When the gasket 【23】 is stuck, remove it by tapping the
balance piston cover with a hammer.
Photo 029 Removing High-stage Unloader Cylinder
5.6.4.2 Inspection
a) Be sure to replace the cap seal 【66】, which is attached to the outer circumference of the unloader
piston 【64】, as well as the O-ring 【65】.
b) The unloader cylinder often has damage or oil refuse stuck to its inner surface. Clean it thoroughly,
and smoothen its surface by using fine emery paper (#400 or finer).
Photo 030 Removing the Cap Seal of the Unloader Piston
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