G420E/G424E Tier LP Engine N-CA55-500TR Mixer 74
10. Check for binding of the air valve assembly by
pressing down with two fingers on opposite sides
of the air valve assembly (Figure M13). The air
valve assembly should move freely without
binding and have full travel. If the air valve is
binding, loosen the four adapter retaining screws,
re-check the air valve for binding and re-tighten
the adapter retaining screws.
11. Clean and check the orifice fitting (Mixer hose
barb) for obstruction.
CAUTION
The 1/8” NPT X ¼” hose barb fitting that
is installed in the mixer housing uses a
specific machined orifice size through the
fitting. This orifice fitting is part of the
mixer assembly and an integral part of
the MI-04 control. DO NOT replace this
fitting with a standard hose barb fitting or
use a drill bit to clean out the fitting
passage way. If this fitting is damaged the
mixer will need to be replaced.
N-CA55-500TR Disassembled
Service
1. Clean the air valve assembly with soap and warm
water to remove heavy-end deposits. Inspect the
fuel metering valve and sealing ring for wear.
Replace worn components as necessary.
2. Clean the check valve plate with soap and warm
water. Inspect for wear, tears or pinholes in the
check valve and deformations that may cause
leaks or poor performance. Replace components
as necessary.
3. Replace all gaskets before assembly.
4. Clean the mixer body (casting) with a parts
cleaning solvent. Be sure to remove all seals and
gaskets before cleaning the casting with solvent.
Make sure all parts are completely dry before re-
assembly.
NOTE
For re-assembly of the N-CA55-500TR
reverse the disassembly steps.
WARNING
DO NOT spray carburetor cleaner or
solvent into the mixer while installed on
the engine. These chemicals may damage
the oxygen sensor and cause pre-mature
failure of the catalytic muffler.
Figure M13
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