GB-12
JACOBSEN G PLEX II Series: ZV
MAINTENANCE AND PARTS MANUAL
GB
STARTING THE ENGINE
When starting a diesel engine for the first time, after
prolonged storage or if the fuel tank is allowed to run
dry, the fuel system must be bled before attempting
to start the engine. Refer to Bleeding The Fuel
System below.
After bleeding the system (if required):
1. Operator must be properly seated in the
operator’s seat (for maintenance purposes
only, and when operated by trained service
personnel the engine may be started
without the operator seated if the reel
control lever on the backlap valve is in the
backlap position refer to Fig. 36, on page
20).
2. Make sure foot is off direction/speed
control pedal. The mow raise pedal must
be in the raised position and the reel
enable switch must be in the off position
before the engine will start.
3. Push hand throttle lever forward to a
“MIDDLE” position.
4. Insert key in ignition switch and turn to ON
position.
5. Push and hold the pre–heat switch
forward. The red indicator light will come
on. When the light goes out, release the
pre–heat switch and start the engine (If the
engine has been running and is already
warm, there should be no need to pre heat
the glow plugs).
6. After the engine starts, allow it to warm up
for at least one minute.
NOTICE
• The starter motor should never be run for
more than 10 seconds. If the engine does
not start after operating the starter for 10
seconds, stop the starter. Wait for 30
seconds and repeat the start sequence.
• Do not use ether or starter fluid; severe
engine damage may occur.
7. After the engine starts, check the
following:
•Make sure the oil pressure light goes off
•The exhaust should be colorless or
slightly dark when engine is under load
NOTICE
• If the oil light or water temperature light
and buzzer come on during operation, stop
the engine immediately. To avoid serious
engine damage, find and fix the problem
before restarting.
BLEEDING THE FUEL SYSTEM
WARNING
• This procedure must be performed as
specified and only by properly trained
service personnel.
The fuel system must be bled when:
•Starting the engine for the first time
•The fuel tank becomes completely empty
•The engine has not been used for an
extended period of time
•The fuel filter and/or fuel lines have been
loosened, removed or replaced.
Primary fuel filter PN 825619
Secondary fuel filter element (See Fig. 25)
PN 840161
1. Fill the fuel tank.
2. Open the air vent on top of the fuel filter
(See Fig. 25).
3. Without preheating the glow plugs, turn
the ignition switch to START to operate
the fuel pump. Allow the starter to run the
pump until a steady stream of fuel is
coming out of the fuel filter air vent. Stop
the starter and close the air vent.
1
2
Figure 25
1. Fuel Filter Air Vent
2. Secondary fuel filter
4. Open the air vent on top of the injection
pump, open air vent only when engine is
NOT running (See Fig. 26).
1
Figure 26
1. Injection Pump Air Vent
5. Without preheating the glow plugs, turn
the ignition switch to START to operate
the fuel pump. Allow the starter to run the
pump until a steady stream of fuel is
coming out of the injection pump air vent.
Stop the starter and close the air vent.
WARNING
• Catch fuel and dispose of properly.
• To avoid a fire hazard, clean up any
spilled fuel.
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