A New Filter is Available for the DEF Tank Adaptor for C7.1 Engines {108H} Caterpillar

Introduction

Do not perform any procedure in this Special Instruction until you have read the information and you understand the information.

There have been some isolated instances of issues with debris blocking up the pickup pipe for the manifold (DEF Heater). This has resulted in a lack of injection of Diesel Exhaust Fluid (DEF). The following diagnostic trouble codes may be displayed in the electronic service tool:

• E931 (2) Low Aftertreatment #1 SCR Dosing Reagent Absolute Pressure: Low - moderate severity (2)

• E1370 (2) Aftertreatment Diesel Exhaust Fluid Dosing Unit Loss of Prime

A new filter has been introduced for the Diesel Exhaust Fluid (DEF) tank adaptor. The new filter in the DEF tank adaptor helps to eliminate debris from entering the DEF system and reduces the occurrences of the E931 (2) and E1370 (2) diagnostic trouble codes being displayed.

Safety Section

Illustration 1	g00104545

Prevent the machine from movement. Park the machine on a level surface.

Attach a "Do Not Operate" warning tag or a similar warning tag to the start switch or to the controls before you service the equipment. These warning tags (Special Instruction, SEHS7332) are available from your AVSpare dealer.

Required Parts

Refer to table 1 to select the correct DEF tank adaptor that is applicable to the relevant machine serial number prefix.

Refer to table 2 to select the correct DEF tank adaptor that is applicable to the relevant industrial engine arrangement number.

Installation Procedure

1. Ensure that the area around the DEF tank adaptor is clean and free from debris.
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   Illustration 2	g06014182
   Typical example

2. Remove two screws (1) from existing DEF tank adaptor (2). Retain the two screws.

3. Remove existing DEF tank adaptor (2) from DEF tank (3).
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   Illustration 3	g06014188
   Typical example

4. Obtain new DEF tank adaptor. Ensure that O-ring seal (4) is present in the new DEF tank adaptor.
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   Illustration 4	g06014187
   Typical example

5. Install new DEF tank adaptor (5) to DEF tank (3). Tighten the DEF tank adaptor hand tight.
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   Illustration 5	g06014192
   Typical example (W) Minimum of 15.7 mm (0.62 inch), Maximum of 16 mm (0.63 inch) (X) Diameter of 49 mm (1.93 inch) (Y) 23 mm (0.91 inch) (Z) 30 mm (1.18 inch)

6. Fabricate a suitable tool to achieve the tightening torque required to torque the new DEF tank adaptor to the DEF tank. Refer to illustration 5 for more information.

7. Tighten the DEF tank adaptor (5) to a torque of 35 N·m (26 lb ft).

8. Install two screws (1) into DEF tank adaptor (5). Tighten the self-tapping screws (1) securely.

   Note: When the screws are tightened, ensure that the screws are parallel with the wall of the DEF tank adaptor.