4-5
62--611XX--20 (03/04)
a. Checking fuel circuit
1. The engine must run with bleed port slightly
unscrewed.This indicates that injection pump
pressure is greater than 0.1 bars. (If not check for air
leakages and clean fuel lines).
2. The electrical pump is designed to deliver 0.7 bar.
The fuel circuit flow rate in the return line is about 5
liters per hour.
b. Changing fuel filter
After changing fuel filter operate the electrical pump
to bleed properly the fuel circuit before engine start.
CAUTION
When changing fuel filter, the new filter
should be filled with clean fuel.
4.3.4
Replacing solenoids (Figure 4-3)
1. Remove spring from the run/stop (or speed) lever
(item 4.).
2. Disconnect solenoid. Remove clip (item 3.) from
linkage rod (item 5.).
3. Remove solenoid and install the new one (clip +
spring).
4. Energize the solenoid and verify that :
D
for STOP SOLENOID : run/stop lever is at full
position. Lever should not touch surface.
D
for RUN SOLENOID : speed lever touchs high
speed adjusting screw (at rated operation
speed).
Stop/Run lever
RUN
Keep 1 or 2 mm gap
Stop/Run lever
STOP
5. De-energize the solenoid and verify that :
D
for STOP SOLENOID : engine shutdowns
immediatly. Otherwise, adjust solenoid position.
D
for SPEED SOLENOID : Speed lever touchs low
speed adjusting screw (at rated operating
speed).
Speed lever
HIGH
SPEED
Speed lever
LOW
SPEED
High speed
setting screw
Low speed
setting screw
6. Verifythatsolenoid moves smoothly when energized
or de-energized.
1. Run solenoid
2. Boot
3. Clip
4. Spring (speed solenoid)
5. Linkage rod (run)
6. Engine speed lever
7. Speed solenoid
8. Plunger
1.
4.
6.
3.
3.
5.
7.
3.
2.
2.
Only for 750Mt
_
& 850Mt
_
8.
Figure 4-3 Speed and run control solenoids