Caterpillar Truck Engine 3126

Warning: This inspection requires trained personnel with PPE!

Alternator has loose connections?

Ammeter reading during engine operation

Alternator and battery charger operating properly?

Battery too cold to crank the engine?

Engine not run for long periods or run for short periods?

Warning: Check the cooling system only when the engine is stopped and cool.

Loosen the cooling system filler cap slowly in order to relieve pressure.

Cooling system filler cap loosened and pressure relieved?

It may be necessary to drain enough coolant from the cooling system in order to add the Extender.

Coolant drained from the cooling system?

Add Extender according to the requirements for your engine’s cooling system capacity.

Extender added according to the requirements?

Clean the cooling system filler cap. Inspect the gaskets on the cooling system filler cap.

Warning: Personal injury can result from air pressure. Personal injury can result without following proper procedure. When using pressure air, wear a protective face shield and protective clothing.

Maximum air pressure at the nozzle must be less than 205 kPa (30 psi) for cleaning purposes.

Inspect the radiator for damaged fins, corrosion, dirt, grease, insects, leaves, oil, and other debris.

Clean the radiator, if necessary.

Pressurized air is the preferred method for removing loose debris.

Direct the air in the opposite direction of the fan’s air flow.

Hold the nozzle approximately 6 mm (0.25 inch) away from the fins.

Slowly move the air nozzle in a direction that is parallel with the tubes.

Pressurized water may also be used for cleaning. The maximum water pressure for cleaning purposes must be less than 275 kPa (40 psi).

Warning: Pressurized System: Hot coolant can cause serious burns. To open the cooling system filler cap, stop the engine and wait until the cooling system components are cool. Loosen the cooling system pressure cap slowly in order to relieve the pressure.

Cooling system filler cap loosened and removed

Coolant drained to a level below the hose being replaced

Hose clamps installed with a torque wrench

Warning: Wear goggles, gloves, protective clothing and a dust respirator certified by the National Institute for Occupational Safety and Health (NIOSH) and by the Mine Safety and Health Administration (MSHA) when cleaning the diesel particulate filter. Failure to do so could result in personal injury.

Note: If the red warning light has been activated Do Not perform a back pressure test. The catalyst section could begin to regenerate. This will damage the DPF.

Caterpillar recommends recording when the DPF is cleaned. Record the cleaning in the Operation and Maintenance Manual, “Maintenance Log”.

Perform a back pressure test prior to cleaning the DPF and record the results.

After the cleaning of the DPF run the engine on high idle for 5 to 15 minutes. Perform another back pressure test and record the results.

Collection of Ash: A filter bag is required to collect the ash from the DPF. The filter bags are available from your Caterpillar Dealer. The filter bag will trap particles as small as 5 microns. A filter bag can be used 5 to 10 times.

Note: Disposal of the filter bags must be in accordance with the following regulations: Federal, State, and Local Laws.

Follow the recommended method for cleaning the DPF.

The DPF does not have labels on the inlet or outlet ends of the catalyst section or the filter section. Mark the outside of both the filter section and the catalyst section with a marker. This will identify the orientation of the sections. This is important because you will reinstall the sections in the opposite direction.