Aftertreatment Fuel Pumps May Fail on Certain Stage IIIB M300D Wheeled Excavators {1256} Caterpillar

Introduction

The problem that is identified below does not have a permanent solution. Until a permanent solution is available, use the solution that is identified below.

Problem

On certain M300D update Series with Stage IIIb Aftertreatment system the temperature increase in front of the DPF is too low during regeneration at high engine speed (speed dial 8, 9 or 10).

This results in an DPF regeneration failure event code EID 593 "Aftertreatment Insufficient Temperature to Complete Regeneration". There are three possible reasons, why a machine cannot reach the required temperature in a certain time, leading to the same EID 593 code.

• Fault at the thermocouple in front of DPF 389-5624 Temperature Sensor

• Low performance of the Diesel Oxidation Catalyst 416-5035 Catalytic Converter As. This is mainly seen at machines with more than 700 SMU hours.

• Worn HC dosing pump 360-8918 Fuel Pump As. This is mainly seen at machines with less than 700 SMU hours.

Solution

Illustration 1	g06020890
View of pump assembly (1) 360-8918 Fuel Pump As

Until a permanent solution is found replace with same part.