CB9A-020 page 18
MAINTENANCE
4. To reinstall valves:
a. Install a new valve gasket into the cylinder head (remove any old gaskets).
b. Install the valve assembly in the cylinder head. Make sure the valve's orientation and location are
correct.
c. Center the valve cage on the valve assembly.
d. Applies only to suction valves with unloaders.
Models HD161, HD162 & HD163:
Install the Unloader spring, actuator and plunger in the cage.
Models HD361, HD362, HD363, HD601, HD602 & HD603
Install the unloader plunger in the cage.
e. Models HD361, HD362, HD363, HD601, HD602 & HD603
Make sure the valve hold down screw is removed from the cover plate, then install the valve cover plate
with a new O-ring. Tighten the cover plate capscrews according to the Bolt Torque Table.
f. Install the hold down screw and tighten according to the Bolt Torque Table.
g. Install the valve cap (or unloader assembly) and O-ring. (A little oil or grease on the O-ring will help
hold it in place during installation.)
5. After replacing the valves, rotate the flywheel by hand to check for interference between the pistons and the
valves.
6. After 60 minutes of running time, remove the valve cap (or unloader assembly) and retorque the hold down
screw. Replace the valve cap and O-ring.
UNLOADER SEAL REPLACEMENT
a. Remove the unloader cap and O-ring.
b. Remove the unloader body from the cylinder head (a strap wrench is helpful).
c. Push the unloader piston out the top of the unloader body.
d. Inspect and replace the seals as needed - note the seal orientation!
e. Inspect the unloader body bore - it must be clean and smooth.
f. Reassemble in the reverse order.
PISTON RING REPLACEMENT
1. Follow steps 1 through 3 of "Compressor Disassembly."
2. Remove the piston rings and the piston ring expanders from the pistons.
3. To replace the piston rings:
a. Place an expander in the top groove of the piston. Place an expander in the second groove with the
break in this expander 180 degrees from the break of the top expander. Place the third expander in the
bottom groove with its break in the same position as the top expander.
b. Place piston rings in all three grooves of the piston. Make sure the breaks in the piston rings are
directly opposite the breaks in the corresponding expanders.
4. Reassemble the compressor per steps 10 through 14 of "Compressor Assembly."
To Next Page
Loading...
