JLG sky trak mmv Service Manual page 55

5. Remove and properly dispose of the old strainer.
6. Install the new strainer with the arrow pointing
toward the lift pump.
7. Assemble the hoses to the strainer and tighten the
hose clamps.
8. Remove air from the fuel system. (Refer to Section
2.13.7, d. Venting Air from the Fuel System .)
9. Close the engine cover.
d. Venting Air from the Fuel System
WARNING:
the fuel system of a hot engine. Allow the
engine to cool before attempting to purge air
from the fuel system. Failure to do so could
create a fire hazard.
Air must be vented from the fuel system whenever any
component between the fuel tank and the injection pump
has been disconnected, or when the system has been
emptied, or has run out of fuel.
IMPORTANT: DO NOT attempt to start the engine until
the injection pump has been filled and primed with fuel.
Serious damage to the lift pump will result due to lack of
proper lubrication.
1. To vent the low pressure lines and fuel filter, open
the vent screw (7), located on the filter head.
2. Operate the hand plunger (8) on the lift pump (5)
until fuel flowing from the fitting is free of air.
3. Tighten the vent screw and torque to 7 lb/ft (9 Nm).
The process of venting the high-pressure fuel lines (9)
involves energizing the starter motor, which rotates the
crankshaft, which, in turn, operates the fuel pump to
purge air from the high-pressure fuel lines.
CAUTION:
engine with the starter motor to vent air from
the fuel system, DO NOT energize the starter
solenoid or crank the engine for more than 15
seconds at a time. Wait two minutes between
each 15-second cranking interval.
Model MMV Rev. 12/04
General Information, Specifications and Maintenance
DO NOT vent air from
When cranking the
WARNING:
sure can penetrate the skin and cause serious
personal injury. Slowly loosen fittings and allow
release of residual pressure before removing
any fuel line.
4. Loosen one high-pressure line fitting (10) at the
injector (11). Operate the starter motor for 15
seconds. Wait two minutes. Operate the starter
motor again for 15 seconds. Repeat this process
until fuel, free of air, comes out of the injector fitting.
9
5. Tighten the fitting to 22 lb/ft (30 Nm). Repeat this
procedure for each fitting until the engine runs
smoothly. With the engine running, visually check for
leaks. Turn the ignition switch OFF.
Diesel fuel under pres-
10
11
OS0990
2.39