freightliner 108SD, Руководство пользователя

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3.
Check the steering wheel for excessive play.
3.1 Start the engine. With the front tires
straight ahead, turn the steering wheel
until motion is observed at the front
wheels.
3.2 Align a reference mark on the steering
wheel to a rule, then slowly turn the steer-
ing wheel in the opposite direction until
motion is again detected at the wheels.
3.3
Measure the lash (free play) at the rim of
the steering wheel. Excessive lash exists
if steering wheel movement exceeds 2-1/2
inches (64 mm) with a 20-inch (508-mm)
steering wheel, or 2-1/4 inches (57 mm)
with an 18-inch (450-mm) steering wheel.
3.4 If there is excessive lash, check the steer-
ing system for wear or incorrect adjust-
ment before operating the vehicle.
Natural Gas Fuel System Inspection,
If Equipped
1. Leak test all fuel system components, joints, and
fittings using a methane detector. A bubble solu-
tion can be used to pinpoint the exact location of
leaks.
Replace any leaking or damaged fuel tanks and
fuel lines; repair or replace leaking or damaged
fittings.
2. Drain the CNG high-pressure fuel filter housing,
if equipped.
2.1 Purge the CNG fuel lines by closing the
CNG fuel cylinder shutoff valves. Start the
engine and let it idle until the fuel lines are
empty and the engine stops.
Gauges on the fuel panel should now read
at or near 0 psi (0 kPa).
2.2 Close the manual fuel shutoff valve on the
fuel panel.
2.3 Remove the two capscrews that secure
the access cover to the fuel panel, then
remove the access cover. See
Fig. 21.16 .
Save the capscrews for installation.
2.4 Slowly open the bleed valve on the mani-
fold to relieve remaining fuel pressure
within the system. See
Fig. 21.17 .
IMPORTANT: Some pressure may remain in
the fuel system between the solenoid valve
and the engine. Use caution when loosening
fittings, as a small amount of gas may leak
out.
2.5 Put a clean receptacle under the filter as-
sembly.
2.6 Using an 11/16-inch wrench, remove the
drain plug from the filter bowl.
When all liquid has drained, install and
tighten the drain plug on the filter bowl.
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2
3
4
5
6
7
8
1
1. Fuel Panel Access Cover
2. Capscrews (qty 2)
3. Wiring Harness
4. Pressure Relief Valve and Cap
5. Coolant Outlet Line
6. Coolant Inlet Line
7. Fuel Inlet Line (to fuel cylinders)
8. Fuel Outlet Line (to engine)
Fig. 21.16, CNG Fuel Panel Assembly
Pre- and Post-Trip Inspections and Maintenance
21.14