Carrier Transicold X4 7300, Operation & Service Manual

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8–7 62-11637
Figure 8.6 Fuel Bleed Components
8.5.2 Priming the Fuel System
The mechanical fuel pump (See Figure 8.6 ) is
mounted on the engine next to the injection pump. This
pump has a manual plunger for priming the fuel system
when the fuel tank has been run dry.
To prime the fuel system, use the following steps:
1. If bleeding a spin–on system, considerable effort
may be saved by changing the filter and filling
the new element with clean diesel fuel before
priming the remainder of the system. Refer to
Section 8.5.5 . If bleeding a suction side filter
system remove the vent cap from the filter bowl
and add fuel until level is about even with the
top of the filter element, reinstall cap. Do not
allow fuel level to fall below the visible level in
the bowl as the bleeding procedure is accom-
plished, add more fuel if required.
2. Turn the bleed valve (red) counter-clockwise
until fully opened.
3. Turn the top of the manual plunger counter-
clockwise to unlock it. S-L-O-W-L-Y (up/down
once per second) pump the manual plunger until
positive pressure (resistance) is felt. This may
take up to 200 strokes. This will indicate fuel
flow.
4. Continue to pump S-L-O-W-L-Y (up/down once
per second) approximately 100 more strokes to
fill the filter and bleed the air out of the lines.
5. Start engine. It may be necessary to continue to
pump until the engine starts.
NOTICE
Running the engine for an extended
period of time with the manual plunger up
can cause a priming pump failure
6. Depress and turn the top of the manual plunger
clockwise to lock in place.
7. When engine is running smoothly, turn bleed
valve clockwise until fully closed. If bleeding a
suction side filter system, loosen the vent on the
cover until fuel level lowers to the collar clamp
then hand tighten vent.
8.5.3 Mechanical Fuel Pump Screen
The fuel screen (See Figure 8.7 ) may become plugged
or restricted with foreign particles or wax as a result of
using the wrong grade of fuel or untreated fuel in cold
weather. This will cause the engine to lose power. The
screen must be cleaned on a regular schedule such as
unit pre-trip or when the oil and fuel filters are changed.
(Refer to
Section 8.2 ).
Figure 8.7 Mechanical Fuel Pump
To check or replace Screen
1. Ensure the unit will not start automatically by
disabling any two way communication and plac-
ing the STOP/RUN-OFF switch in the OFF posi-
tion.
2. Turn nut ( Figure 8.7 ) counter-clockwise to
loosen and remove it.
3. Remove banjo fitting and let it hang loose. Dis-
card copper rings and replace with new ones.
4. Turn screen counter-clockwise and remove.
Check and clean or replace as required.
5. To install reverse above steps.
6. Start unit and check for leaks.
1
2
3
4
1. Mechanical Fuel
Pump
2. Manual Plunger
3. Bleed Valve
4. Injection Pump
Banjo
Fitting
Nut
Copper
Rings
Screen
Nut