Alternator Bearing Service; 300 Kw Models; 1000 Kw Models With 4M/5M/7M Single-Bearing Alternator; Diesel Fuel Systems - Kohler Decision-Maker 3000 Operation

3.4 Alternator Bearing Service

Have an authorized service distributor/dealer perform
service.
3.4.1

20- -300 kW Models

Replace the end bracket bearing every 10,000 hours of
operation in prime power applications. Service the
bearing more frequently if the annual inspection
indicates excessive rotor end play or bearing damage.
The sealed end bracket bearing requires no additional
lubrication.
3.4.2 300- -1000 kW Models with
4M/5M/7M Single-Bearing
Alternator
The alternator bearing requires lubrication at intervals
specified in the generator set technical manual. Use
Chevron SRI or equivalent antifriction, high-quality
grease with a lubrication temperature range of --30°C to
175°C (--22°F to 350°F).

3.5 Diesel Fuel Systems

3.5.1

Bleeding Air from Fuel System

Bleed air from the fuel system after fuel system
maintenance, such as replacing the fuel filter(s). Use
the hand prime pump kit, when equipped. The hand
prime fuel pump eliminates the need for cranking the
engine to bleed air from the fuel system.
Note: Bleed air from the fuel system according to the
engine manufacturer's instructions. Trapped air
in the fuel system causes difficult starting and/or
erratic engine operation.
Note: Correct any fuel leaks encountered during the
priming procedure.
1. Place the fuel valves in the fuel system prime
position. Close the fuel valve located between the
pipe tee and the engine. Open the fuel valves on
each side of the fuel prime pump. See Figure 3-1.
Note: The illustration shows a generator set
without a fuel/water separator. The valve
location and position for a generator set
equipped with a fuel/water separator is
similar.
2. Loosen the bleed screw at the engine. Refer to the
engine operation manual for location of the bleed
screw(s). The bleed screw allows air to be expelled
from the fuel system when the hand prime pump is
operated.
52 Section 3 Scheduled Maintenance
Close this Valve
Open this Valve
Valve Open Valve Closed
Figure 3-1 Hand Prime Pump with Valve Positions
for Fuel Priming (generator set without a
fuel/water separator shown), Typical
3. Rotate the hand
counterclockwise until fuel flows from the bleed
screw. Stop pumping.
4. Tighten the bleed screw. Wipe up any fuel leakage.
5. Place the fuel valves in the normal operation
position. Open the fuel valve located between the
pipe tee and the engine. Close the fuel valves on
each side of the fuel prime pump.

3.6 Gas Fuel Systems

Gas fuel systems apply to REZG_/RZG_/ERES_ (GM
Powered) and REZX_/RZX_ (Doosan Powered)
generator set models.
This section describes natural gas and liquified
petroleum gas (LPG) fuel systems that are not covered
in the engine operation manual or engine service
manual.
3.6.1 Gas Fuel System Concept
(Single Fuel)
The gas fuel system uses a fuel valve with a solenoid to
control the fuel flow to the fuel regulator.
generator set-mounted regulator reduces the fuel
pressure as fuel passes to the fuel mixer.
Figure 3-2.
The fuel mixer controls the ratio of fuel to air under
varying load and speed conditions. Because the fuel
mixer receives fuel in a gaseous state, it does not have
to vaporize the fuel.
Open this Valve
PK-272000-H
prime pump handle
The
See
TP-6694 7/11