freightliner 114SD - Weekly Post-Trip Inspection and Maintenance

is within the normal range of 120 to 150 psi (827
to 1034 kPa). If tank pressure exceeds 230 psi
(1586 kPa) and the pressure relief valve does
not open automatically, vent the tank immedi-
ately.
8.
Inspect the LNG vaporizer for signs of damage
or leaks. See
Fig. 21.11. Inspect the vaporizer
mounting brackets for signs of looseness.
Weekly Post-Trip Inspection
and Maintenance
Engine Compartment Inspection
WARNING
Washer fluids may be flammable and poisonous.
Do not expose washer fluid to an open flame or
any burning material, such as a cigarette. Always
comply with the washer fluid manufacturer’s rec-
ommended safety precautions.
1.
Check the windshield washer reservoir fluid level.
The reservoir is usually located near the right-
hand frame rail.
2.
After resetting the air intake restriction indicator
during the daily pretrip inspection, check the indi-
cator again with the engine off.
2.1
Check an indicator with graduations to see
if air restriction exceeds the value shown
in
Table 21.2.
Check a go/no-go indicator without gradu-
ations to see if the colored bar shows
through the clear window.
05/05/2010 f470533
1
2
3
4
5
6
7
8
10
11
12
9
1. Pressure Control Regulator
2. Vapor Shutoff Valve
3. Fuel Fill Hose
4. Secondary Relief Valve (red cap)
5. Fuel Fill Fitting
6. Fuel Level Sender Box
7. Primary Relief Valve
8. Tank Pressure Gauge
9. Fill Vent Fitting
10. Excess Flow Valve
11. Fuel Shutoff Valve (liquid)
12. Fill Check Valve
Fig. 21.9, LNG Tank Plumbing Components
H
I
G
H
PR
E
S
S
U
R
E
PR
E
S
S
U
R
E
L
O
W
CYLINDERS
INSPECT CYLINDERS
EVERY 36 MONTHS
OR 36000 MILES
WHICHEVER OCCURS FIRST
NATURAL
GAS
VEHICLE
110 PSIG
ON
M
A
N
U
A
L
S
H
U
T
O
F
F
V
A
L
V
E
OPEN VALVE
SLOWLY
3600 PSIG MAX.
SERVICE PRESSURE
REGULATOR
FILTER
INSPECT PRESSURE
RELIEF DEVICE
EVERY 2000 MILES
DRAIN HOUSING
EVERY 1500 MILES
REPLACE ELEMENT
EVERY 3000 MILES
1
2
3
4
04/30/2010 f470556
1. High Pressure Gauge
2. Low Pressure Gauge
3. Manual Fuel Shutoff Valve
4. Fuel Fill Port
Fig. 21.10, CNG Fuel Panel
Pre- and Post-Trip Inspections and Maintenance
21.9