COMPRESSOR ASSEMBLY
CB9A-005 page 17/28
Compressor assembly is generally the opposite of
compressor disassembly. Before reassembling, clean
each part thoroughly. Check all machined surfaces for
burrs or roughness, and file lightly if necessary.
Replace
any O-rings or gaskets that are removed or disturbed
during service.
1.
CRANKCASE ASSEMBLY
After replacing the crankshaft, bearing carrier, and
bearing cover plate, the connecting rod and
crosshead can be assembled in the crankcase. See
the "Bearing Replacement" section.
a. To attach the connecting rod to the crosshead
assembly, first coat the wrist pin, the wrist pin
bore in the crosshead assembly, and the wrist
pin bushing in the connecting rod with grease.
b. Start the wrist pin in the bore of the crosshead
assembly until the pin begins to project through
to the inside of the crosshead assembly. (Use
an arbor press if available.)
c. Slide the connecting rod up inside of the
crosshead assembly and align the bushing with
the wrist pin.
d. Install the wrist pin through the connecting rod
until it is centered in the crosshead assembly.
The wrist pin should be snug in the crosshead
assembly. The connecting rod should rotate
freely on the wrist pin, but should not be loose.
e. Dip the wrist pin plugs in grease and press them
against the ends of the wrist pin.
f. Place the bearing halves into each half of the
connecting rod, aligning the bearing tangs with
the slots in the connecting rod. Coat the bearing
with grease.
g. Set the top of the connecting rod over the
crankshaft journal. Replace the connecting rod
cap with the dots on the connecting rod and cap
on the same side.
h. Start the nuts on the connecting rod bolts and
torque per Table 7 - "Bolt Torque."
2.
CROSSHEAD GUIDE
a. Place the crosshead guide gasket on top of the
crankcase.
b. Lubricate the inside bore of the crosshead guide
with light oil.
c. Set the crosshead guide over the piston rod and
crosshead, and slowly lower it against the
crankcase. Make certain that the crosshead
assembly is started straight in the bore of the
crosshead guide to prevent binding when
lowering the crosshead guide into position.
d. Install the crosshead guide capscrews. DO NOT
tighten.
3. Fill the crankcase with oil. Refer to the "Crankcase
Lubrication" section. Squirt oil into the crankshaft,
roller bearings, crankshaft journals, and crosshead
assemblies to ensure proper lubrication at start up.
4. Attach the inspection plate and the inspection plate
gasket to the crankcase.
5.
PACKING BOX ASSEMBLIES
Before installing the packing boxes into the
crosshead guide, inspect the piston rods for scoring
or roughness. Remove any burrs or sharp edges.
Lubricate the piston rods and packing box O-rings
with light oil.
Do not damage the packing when
starting it over the rod. Use of a Blackmer
packing installation tool is recommended.
(see
‘Tool List’ table).
Double-Seal Models
a. Insert the lower packing box O-ring into the
crosshead guide.
b. Start the packing box assembly, short end down,
over the piston rod.
c. After the lower set of packing is started over the
piston rod, make sure the oil deflector ring is
properly aligned (with the flat side down) over
the piston rod. Use the hole in the side of the
packing box to center the deflector ring. Once
the deflector ring is over the rod, the packing box
can be fully inserted.
d. Install the upper packing box O-ring on the end
of the packing box.
e. Place packing box spacer ring over the O-ring.
f. Install the packing box retainer ring with new
nylon locking inserts, and tighten.
6. Rotate the crankshaft by hand a few times, then
uniformly tighten the crosshead guide capscrews per
Table 7 - "Bolt Torque."
7. Break in new packing per the "Seal (Packing)
Replacement" section of this manual.
8.
CYLINDER ASSEMBLY
a. Install new O-rings in the bottom of the cylinder.
A small amount of grease may be used to hold
the O-rings in place during assembly.
b. Set the cylinder over the piston rods and against
the crosshead guide.
c. Install the cylinder capscrews. DO NOT tighten.
