Yanmar engines LV series (L48V, L70V, L100V). Manual - part 9

PRODUCT OVERVIEW

LV Operation Manual

21

AIR COOLED ENGINE

The LV engine is air-cooled by means of a cooling 
fan. The cooling system consists of a fan 
attached to the flywheel.

CONTROLS - RECOIL 
STARTER

The LV Series engines are equipped with a recoil 
or electric starter. This section explains the 
controls available with the recoil starter.

Recoil Starter

A recoil starter allows you to manually start an 
engine by pulling on the recoil starter handle 
(Figure 3, (1)). When you pull on the handle you 
set the flywheel and crankshaft in motion. The 
recoil starter is spring loaded so the handle and 
attached cable automatically return to the recoil 
starter assembly.

Figure 3

Decompression Lever

The decompression lever (Figure 4, (1)) helps 
you start the engine by reducing the effort 
needed to pull the recoil starter handle. The 
decompression lever will automatically return to 
the original position when the engine starts. 
Some LV model engines have an automatic, 
internal compression release mechanism and do 
not have the external compression release lever. 
Refer to the specific instructions for your driven 
machine.

Figure 4

INDICATORS AND CONTROLS 
– ELECTRIC STARTER

If an LV series engine is ordered with an electric 
starter it will include a key switch and may also 
have indicators to monitor engine functions.

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CAUTION

The illustrations and descriptions of 
optional equipment in this manual, such 
as the operator’s console, are for a 
typical engine installation. Refer to the 
documentation supplied by the optional 
equipment manufacturer for specific 
operation and maintenance instructions.

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PRODUCT OVERVIEW

22

LV Operation Manual

Indicators

Battery - (Figure 5, (1)) - Your driven machine 
may have a battery indicator that comes on if 
there is a problem in the charging system. This 
indicator does not indicate whether the battery is 
discharged. See Troubleshooting Chart on 
page 85.

Heat - If your engine has an inlet air heater, it may 
have a heat indicator that lights when the inlet air 
heater is activated. Follow the instructions 
provided by the driven machine manufacturer for 
the operation of this indicator.

Controls

Key Switch

If your engine is equipped with electric start it 
may have a three position key switch - OFF, ON, 
and START. See Figure 5 for an illustration of a 
typical key switch.

Figure 5

OFF (key straight up and down) (Figure 5, (2)) - 
When you turn the key to this position the engine 
shuts down. Electric current to the battery 
indicator and other electric devices is shut off. 
You can insert and remove the key in this 
position.

ON (Figure 5, (3)) - This is the position the key 
will be in when the engine is running. When the 
engine is not running, use this position to 
energize the optional devices such as indicators 
or electric fuel pump.

START (Figure 5, (4)) - Turn the key to this 
position to start the engine. As soon as the 
engine starts, release the key and it will 
automatically return to the ON position. Some key 
switches may be equipped with a feature that 
prevents you from turning the key to the START 
position while the engine is running. In these 
configurations, you cannot turn the key to the 
START position without first returning the key to 
the OFF position.

CAUTION

For maximum engine life, Yanmar

 

recommends that when shutting the 
engine down, you allow the engine to 
idle, without load, for 5 minutes. This 
will allow the engine components that 
operate at high temperatures, such as 
the turbocharger (if equipped) and 
exhaust system, to cool slightly before 
the engine itself is shut down.

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CAUTION

Only hold the key in the START position 
for 15 seconds or the starter motor will 
overheat.

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ON

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PRODUCT OVERVIEW

LV Operation Manual

23

Inlet Air Heater

Some engines may be equipped with an inlet air 
heater. Heated inlet air helps the engine to start 
easier in cold weather. During the engine starting 
sequence the inlet air heater is activated for 
several seconds. If the engine is equipped with an 
air inlet heater timer, after the heat indicator goes 
out, the engine can be started.

Engine Speed Controls

Several types of engine speed controls are 
used in LV engine applications. This 
illustration shows a typical example. Refer to 
the operating instructions for the driven 
machine.

The speed control lever (Figure 6, (1)) controls 
the engine speed. The lever could be linked to the 
engine speed control device.

The low idle speed limit screw (Figure 6, (2)) sets 
engine speed while it is idling.

The high idle speed limit screw (Figure 6, (3)) 
restricts the maximum engine speed when the 
engine is operated without a load. 

Figure 6

CAUTION

NEVER attempt to adjust the low or high 
idle speed limit screw. This may impair 
the safety and performance of the 
machine and shorten its life. If 
adjustment is ever required, contact 
your authorized Yanmar industrial 
engine dealer or distributor.

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LV Operation Manual

25

BEFORE YOU 

OPERATE

LV Operation Manual

This section of the Operation Manual describes 
the diesel fuel and engine oil specifications and 
how to replenish them. It also describes the daily 
engine checkout.

CAUTION

NEVER permit anyone to operate the 
engine or driven machine without proper 
training.

• Read and understand this Operation 

Manual before you operate the 
machine to ensure that you follow safe 
operating practices and maintenance 
procedures.

• Machine safety signs and labels are 

additional reminders for safe operating 
and maintenance techniques.

• See your authorized Yanmar industrial 

engine dealer or distributor for 
additional training.

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 DANGER

FIRE AND EXPLOSION HAZARD!

• Diesel fuel is extremely flammable and 

explosive under certain conditions.

• Only fill the fuel tank with diesel fuel. 

Filling the fuel tank with gasoline may 
result in a fire.

• NEVER refuel with the engine running.

• Wipe up all spills immediately.

• Keep sparks, open flames or any other 

form of ignition (match, cigarette, 
static electric source) away when 
fueling / refueling.

• NEVER overfill the fuel tank.

• Fill the fuel tank and store fuel in a 

well-ventilated area only.

• Failure to comply will result in death or 

serious injury.

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