Owner`s manual

21
Kohler Diesel
15LD 315-440/KD315-440
Injection Pump Check Valve
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these engines not shutting down properly. If checks of the
fuel shut-off valve (if supplied) are found to be OK, then the
injection pump check valve should be checked. The check
valve may be stuck in the open position, allowing fuel from
the fuel return line to be ingested and burned.
To check this, turn the engine key to the OFF position (if
equipped). If the unit continues to run, crimp the fuel supply
line from the fuel shut-off valve (if supplied) to the injection
pump. If the engine shuts down, there could be a problem
with the fuel shut-off valve.
If the problem still persists then crimp the return line as
close to the check valve as possible. If the unit immediately
shuts down, the check valve could be stuck open or not
seating properly. Replace the complete injection pump.
Low Oil Pressure Shut-Down System
These engines are available with a factory-supplied low oil
pressure shut-down system. This protects the engine from
damage if it loses oil pressure; a visible warning light turns
on and shuts the engine down automatically through the
electronic fuel valve.
This system works by using two oil pressure switches. One
switch is normally closed and supplies a ground to the
warning light. The other switch supplies a ground to the fuel
shut-off valve and is normally open. Power to the fuel valve
is supplied from the 15/54 terminal of the key switch when
in the RUN position.
The electronic fuel valve is supplied with a by-pass lever
that allows the engine to be started without battery voltage.
The electronic fuel valve is by-passed by placing the lever
on the electronic valve body in the up position.
Low Oil Pressure Shut-Down
System
Part No. ED6745-042-S
Normally Closed
Part No. ED5041-267-S
Normally Open
Fuel Valve
By-Pass Lever
Injection Pump Check Valve
Detail
To Fuel Return Line
(Internal Check Valve)
High-Pressure
Line to Injector
Fuel Supply Line