Air Filters. Maintenance; Maintenance Of Air Filters; Double-Stage Air Filter Maintenance Operations; Inspection Of The Main Filter Cartridge - Kohler SFGLD480 Operation & Maintenance Manual

Generator set models 750/1000rezk

Table of Contents

1. MAINTENANCE OF AIR FILTERS

For higher efficiency, it is essential that air filters be always in perfect conditions. Therefore, it is necessary to

clean or change the filtering cartridges when the appropriate maintenance schedule so specifies or when static

pressure loss at filter outlet exceeds 38mbar.

2. DOUBLE-STAGE AIR FILTER MAINTENANCE OPERATIONS

Servicing double-stage air filters imply the following commonest operations.

Inspection, cleaning and (where appropriate) substitution of the core components of the air filters.

Generally, the main filter cartridge can be cleaned three times before its replacement. By contrast,

NEVER clean the safety component, but replace it, as a rule, at the same time as the main cartridge.

Replacement of the core components of air filters. This operation shall be performed in accordance

with the specified maintenance programme or if found damaged or when cartridge cleaning has reached

the a.m. limit.

Substitution of safety components of air filters. This operation shall be performed according to the

specified maintenance programme or in case of cartridge damage or fouling. NEVER clean the safety

cartridge, always change it when fouled or specified in the maintenance schedule.

2.1. INSPECTION OF THE MAIN FILTER CARTRIDGE

The parameter that determines the fouling level of an air filter is the airflow restriction at the air filter outlet. On

Kohler engines, the maximum permissible air flow restriction or pressure loss is 38 mbar and it is measured

with the engine running at rated power and load.

For monitoring their fouling level, the Kohler engines' double-stage filters include either a mechanical air flow

restriction detector or an electric detector. The mechanical detector has a red-coloured indicator showing up

completely when the maximum permissible pressure drop has been reached. The electric detector consists of a

normally open contact that closes when the airflow restriction reaches the a.m. specification and indicates the

fouling condition of the filters by means of a light signal or by transmitting an electric signal to the PLC. The

system shall be serviced, when the membrane indicator is completely red or the fouling alarm is given. After

servicing a filter with a mechanical fouling indicator, it is necessary to push the "Reset" button on the indicator to

relocate the membrane at its initial position.

Other signs can help detect the plugging of the air filters. A gas engine may be unable to reach its rated power,

or will see its efficiency decrease or even can present carburetion problems (fuel-air mixture becoming richer), if

the air filter does not work properly. A diesel engine with failing air filters will have greater specific fuel

consumption and darker exhaust gases.

Always perform filter maintenance with the engine at rest.

For tangentially sealed filters, inspecting the main filtering cartridge will imply the following sequence of

operations:

1. Back off the air filter locknut and remove the front sealing ring. Also, remove the washer from the main

cartridge.

2. Extract the main filter cartridge from engine's filter, avoiding impacts of the cartridge against the casing.

PRODUCT INFORMATION

IO-C-M-35-001e