COMPRESSOR DISASSEMBLY
CB9A-005 page 16/28
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
severe personal injury or death
Hazardous
machinery can
cause serious
personal injury.
Failure to relieve system pressure prior
to performing compressor service or
maintenance can cause serious
personal injury or property damage.
Hazardous pressure
can cause serious
personal injury or
property damage
Venting pressure from the compressor
piping could release explosive gas to
the atmosphere creating an explosion
hazard, possibly causing severe
personal injury or death.
Hazardous gases
can cause property
damage, personal
injury or death
NOTICE:
Before starting work on the compressor, make sure
all pressure is bled off on both the suction and
discharge.
1. Remove the cylinder head capscrews.
2. Remove the cylinder head assembly and cylinder
head O-rings from the cylinder. The suction and
discharge valve assemblies will come off with the
cylinder head. For valve replacement instructions,
refer to the "Valve Replacement" section of this
manual.
3. Removal of the piston requires a 3" adjustable
spanner wrench with 1/4" pins, such as Blackmer PN
790316.
a. Rotate the flywheel by hand to bring the piston
to top dead center of the cylinder.
b. Remove the piston nut by turning the nut
counterclockwise. (The nylon locking insert in
the piston nut must be replaced during
reassembly.)
c. To remove the piston from the cylinder, turn it
counterclockwise with the use of the adjustable
spanner wrench. For removal and replacement
of the piston rings, refer to the "Compressor
Assembly" section.
d. Remove the thrust washer and any shims. Keep
the shims and piston together.
4. Remove the cylinder capscrews.
5. Lift the cylinder and cylinder O-rings from the
crosshead guide (or distance piece).
6. Packing Box Removal
a. Using an adjustable spanner wrench, remove
the packing box hold-down rings. (Replace the
nylon locking inserts in the hold-down rings
during reassembly.)
b. Remove the packing box and packing box O-
ring from the piston rod.
c. For disassembly of the packing box, refer to the
"Seal (Packing) Replacement" section of this
manual.
7. Remove the crosshead guide capscrews, and lift the
crosshead guide and gasket off.
8. To remove the connecting rod assembly, with the
crosshead attached, it may be necessary to drain the
oil from the crankcase.
NOTE:
The piston rod is
permanently attached to the crosshead to form a
single assembly. Do not attempt disassembly.
a. Remove the inspection plate from the
crankcase.
b. Remove the locknuts from the connecting rod
bolts. This will release the connecting rod cap
(the lower half of the connecting rod) and the two
halves of the bearing insert.
NOTE:
The
connecting rod and the connecting rod cap are
marked with a dot on one side so that they can
be properly aligned when reassembling.
c. Lift the crosshead assembly and connecting rod
off the top of the crankcase.
NOTE: The connecting rod parts are not
interchangeable and must be reassembled
with the same upper and lower halves. To
avoid confusion, work on one connecting
rod at a time, or mark the individual halves
with corresponding numbers.
9. Rest the crosshead assembly on a bench. Carefully
drive the wrist pin and wrist pin plugs out of the
crosshead and connecting rod using a suitable pin
driver or an arbor press. Removal of the pin releases
the crosshead assembly from the connecting rod.
10. If necessary, the wrist pin needle bearings can be
replaced after the crossheads are removed.
11. To replace the crankshaft bearings, the crankcase
must be disassembled, and the crankshaft removed.
Refer to the "Bearing Replacement" section of this
manual.
