Tennant 285, Operator'S Manual

Page: 88 / 136

MAINTENANCE
285 MM191 (12---89)
3-26
TO CHANGE AN LPG FUEL TANK
1. Park the machine in a designated safe area.
WARNING: Fuel vapor is present when
servicing fuel system. Fire or explosion can
result. Keep flames and sparks away.
2. Close the tank service valve.
3. Operate the engine until it stops from lack of
fuel, then set the machine parking brake.
FOR SAFETY: Before leaving or servicing
machine; stop on level surface, set parking brake,
and turn off machine.
4. Put on gloves and remove the quick-disconnect
tank coupling.
WARNING: LPG fuel is very cold.
Frostbite can result. Wear gloves when
connecting or disconnecting LPG hoses.
5. Inspect the LPG fuel lines for wear or damage.
6. Remove the empty LPG fuel tank from the
machine.
7. Check the tank for damage or wear.
8. Store the tank in a designated safe area.
9. Select a filled LPG fuel tank and inspect it for
damage or leaks.
NOTE: Make sure the LPG fuel tank matches the fuel
system (liquid tank with liquid system).
10. Carefully place the LPG tank in the machine so
that the tank centering pin enters the aligning
hole in the tank collar.
NOTE: If the pin cannot be engaged, make sure you
have the correct LPG fuel tank and then adjust the pin
locator in or out.
11. Fasten the tank hold-down clamp to lock the
tank in position.
12. Connect the LPG fuel line to the tank service
coupling. Make sure the service coupling is
clean and free of damage. Also make sure it
matches the machine service coupling.
13. Open the tank service valve slowly and check
for leaks. If an LPG leak is found, close the
service valve immediately and notify the
appropriate personnel.
14. If no leaks are found, the engine is ready to
start.
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 5 psi (35 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
If 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.