Tennant 235, Operator'S Manual

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MAINTENANCE
3-21
235 MM166 (5--91)
FUEL FILTER LOCK
The fuel filter lock filters the LPG fuel. It also
stops the flow of LPG fuel to the engine when the
engine is not operating or when the engine oil
pressure is less than 4 psi (30 kPa).
Replace the filter pack with the filter pack
replacement kit if diminished gas flow indicates
the filter is clogged. A drain plug is provided for
purging the filter bowl. Clean out the bowl when
replacing the filter pack.
VAPORIZER-REGULATOR
nIf any malfunction is noted, completely
disassemble the vaporizer-regulator. Clean all of
the parts in alcohol. Inspect all of the parts and
replace where needed. Carefully reassemble the
vaporizer-regulator with the seal repair kit. Check
for proper operation.
CARBURETOR
If any malfunction is noted, completely
disassemble the carburetor. Clean all of the parts
in alcohol.
Inspect all of the parts and replace when needed.
Carefully reassemble the carburetor with the seal
repair kit.
OIL PRESSURE SWITCH
The engine oil pressure switch requires no regular
maintenance. Never bypass the oil pressure
switch as this is a safety feature which prevents
LPG fuel from flowing when the engine is not
operating properly.
LPG FUEL TROUBLESHOOTING
Problem Cause Remedy
Engine will not start Out of fuel Replace fuel tank with full one Engine will not start
Service valve opened too quickly
-- engaging safety valve
Close valve and reopen slowly
Plugged fuel filter Replace filter
Kinked or restricted fuel line Straighten or replace fuel line
Engine out of tune Tune-up engine
Oil pressure switch failure Replace oil pressure switch
Fuel lock valve failure Repair or replace fuel filter lock
Vaporizer-regulator failure Repair or replace vaporizer-regu-
lator
Engine runs unevenly or lacks
power
Wrong type of fuel tank Replace with either vapor or liquid
withdrawal tank for proper system power
Plugged fuel filter Replace filter
Kinked or restricted fuel line Straighten or replace fuel line
Engine out of tune Tune-up engine
Restricted air filter Clean or replace air filter element
Vaporizer-regulator maladjusted Adjust vaporizer-regulator