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2. After the engine has warmed up to operating tem-
perature, check for leaks in the water lines from
the vaporizer to the thermostat and the intake.
3. If any leaks are found, tighten the connections
and retest. Repeat until there are no leaks for
propane or coolant.
Changing The In-line Fuel Filter
1. Park the power unit on a level surface.
2. Engage the parking brake and shut off the engine.
3. Remove the key from the ignition switch.
4. Turn the fuel shut-off valve to the Off position.
5. Remove the lower
rear frame cover.
6. Loosen the hose
clamps and remove
the fuel fi lter (A).
7. Install the new fuel
fi lter with the fl ow
arrow pointing toward the engine and fasten
securely with the hose clamps.
8. Turn the fuel shut-off valve to the On position.
9. Inspect fuel fi lter hose connections for leaks.
10. Reinstall the lower rear frame cover.
Priming The Fuel System
1. Turn the ignition key to the On position for about
30 seconds. The operator should hear the fuel
pump operating.
2. Start the power unit. Repeat step 1 if necessary.
Fuel Care for 4500Z with Propane Option
1. If engine is operated on both propane and gaso-
line, but the gasoline is kept fresh (used and
replaced with fresh gasoline at a minimum of
every 30 days), no additional steps are necessary.
2. If engine is operated primarily on propane, but
occasionally is switched to gasoline, keep a
minimum of 2 gallons (7.5 L) of gasoline with an
added fuel stabilizer (i.e. Briggs & Stratton Quick
Start or PRI-G).
Run the engine on gasoline for 10 minutes to
allow the fuel treatment to travel all through the
fuel system.
Every 6 months, switch the engine to run on
gasoline until the old gasoline is used, then
replenish with fresh, treated gasoline.
3. If engine is operated solely on propane with no
intention of using gasoline, drain all fuel out of the
fuel tank, start the power unit, and allow to run
until the engine stops to ensure all fuel is out of
the fuel lines, carburetor passages, injectors, etc.
SERVICE
Checking The Fan (Alternator) Belt
(Kubota Engines)
Fingers or loose clothing can get caught in rotat-
ing parts. Shut off the power unit engine, remove
the ignition key, and wait for all moving parts to
stop rotating before working on the power unit.
1.
2. Engage the parking brake and shut off the engine.
A A
3. Remove the key from the ignition switch and
1. Turn the battery disconnect switch to the Off
2.
3. Check the fan belt (A) for
4. Check the fan belt for proper
Adjusting Fan (Alternator) Belt Tension
(Kubota Engines)
Fingers or loose clothing can get caught in rotat-
ing parts. Shut off the power unit engine, remove
the ignition key, and wait for all moving parts to
stop rotating before working on the power unit.
1.
2. Loosen the alternator
3. Loosen the bottom alterna-
4. Move the alternator in the
Service - 44
WARNING
Avoid Personal Injury!
Park the power unit on a level surface.
allow the engine to cool.
position.
Open the engine hood to access the engine
compartment.
excessive wear, cracks, or
damage. Replace if necessary.
tension. Depress the belt
halfway (B) between the
drive pulley and the alterna-
tor pulley and measure the
belt defl ection at the specifi ed
force 22 lbf (98 N, 10 kgf).
The belt defl ection should
measure .28 to .35 inches (7 to 9 mm). If the belt
defl ection is not within specifi cations, the belt ten-
sion must be adjusted.
WARNING
Avoid Personal Injury!
Turn the battery disconnect
switch to the Off position.
adjustment bolt (A).
tor mounting bolt (B).
desired direction.
A A
B B
A A
B B
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Table of Contents
Troubleshooting
