G420E/G424E
Tier
LP Engine
N-CA55-500TR Mixer
70
CHAPTER 8 N-CA55-500TR AIR/FUEL MIXER
Propane is a by-product of crude oil and natural gas.
In the extraction process various hydrocarbons such
as gasoline, kerosene, propane and butane are
separated. Each of these carry a certain amount of
by-product residue, commonly called heavy ends.
Under normal circumstances these residues remain
suspended in liquid and pass through the system
undetected.
Engine coolant flows through the regulator/converter
assisting in the propane vaporization process. As the
coolant temperature rises, the regulator/converter
temperature also rises. The gas becomes hot and
expands to the point where it cannot carry the heavier
hydrocarbons or heavy-ends through the system.
Because of this, the heavy-ends are deposited
(dropped out) into the regulator/converter, the vapor
line from the regulator to the mixer and even in the
mixer itself. When these heavy-ends cool they form a
wax-like deposit or sludge. HD5 grade propane is
recommended for motor fuel use, however HD5
propane will carry a certain amount of heavy-ends.
A fuel filter cannot remove this because it is not dirt or
debris but part of the liquid propane. As these
deposits build up over time regulator fuel ports and
valve seats can be affected, reducing the
performance of the regulator. All propane systems
incorporating a regulator/converter are subject to
heavy-end fouling over time. Because of this it may
be necessary for the certified technician to
disassemble, clean and service the
regulator/converter after long periods of operation.
Removal and Installation of
the N-CA55-500TR Mixer
WARNING
z
LP gas is highly flammable. To prevent
personal injury, keep fire and flammable
materials away from the lift truck when work
is done on the fuel system.
z
Gas vapor may reduce oxygen available for
breathing, cause headache, nausea,
dizziness and unconsciousness and lead to
injury or death. Always operate the forklift in
a well ventilated area
z
Liquid propane may cause freezing of tissue
or frostbite. Avoid direct contact with skin or
tissue; always wear appropriate safety
protection including gloves and safety
glasses when working with liquid propane.
CAUTION
The regulator/converter and mixer are
part of a certified system complying with
EPA and CARB 2004 requirements. Only
trained certified technicians should
perform disassemble, service or
replacement of the regulator/converter or
mixer.
