VALVE REPLACEMENT
CB9A-005 page 20/28
UNLOADER SEAL REPLACEMENT
1. Remove the unloader cap and O-ring.
2. Remove the unloader body from the cylinder head
(a strap wrench is helpful).
3. Push the unloader piston out the top of the unloader
body.
4. Inspect and replace the seals as needed - note the
seal orientation!
5. Inspect the unloader body bore - it must be clean
and smooth.
6. Reassemble in the reverse order.
Fig. 11 – Unloader Valve Assembly
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."
