Reworking and Rerouting the Pre-Heater Exhaust Tube and Insulation Sleeve on Certain 521B and 522B Track Feller Bunchers {1296, 1383, 5096, 7304} Caterpillar


Reworking and Rerouting the Pre-Heater Exhaust Tube and Insulation Sleeve on Certain 521B and 522B Track Feller Bunchers {1296, 1383, 5096, 7304}

Usage:

521B F7B
Track Feller Buncher
521B (S/N: F7B250-251,253-254,258-259,262-265,267-270,272-273,275-276,280-283,285-285,287-289,291-291,294-298,302-303,305-308,310-310,316-318,320-322,327-331,333-334,337-339,341-341,343-345,347-350,352-352,354-354,358-360,362-365,368-368,375-375)
522B (S/N: F7C215-215,217-218,223-223,232-232,235-241,255-255,257-258,260-260,264-264,266-270,272-273,276-277,279-281,284-284,293-293,295-296,303-304,306-307,310-310,315-317,321-323,329-329)

Introduction

This Special Instruction outlines the details for rerouting the pre-heater exhaust tube. The new rework helps keep debris from damaging the pipe insulation and keeps debris off the hot exhaust.

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

Safety Section

------ WARNING! ------

Accidental engine starting can cause injury or death to personnel working on the equipment.

To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system.

Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.


------ WARNING! ------

Before any burning or welding on a machine, all electrical power must be disconnected at the source, and locked out/tagged out. Failure to do so may result in electrical component damage. The immediate area shall be rockdusted, and the required fire-fighting materials shall be immediately available. All required gas testing shall be conducted throughout the operation.


Required Parts

Table 1
Required Parts 
Item  Qty  Part Number  Description 
514-9251  Pipe As 
507-7544  Insulation As 
8T-6703  Hose Clamp 

Installation Procedure

  1. Remove the old 324-9706 Insulation from the existing flex pipe. Clamp the flex pipe to the exhaust end of the pre-heater.


    Illustration 1g06130712

  2. Install the 514-9251 Pipe As to the upper frame at location (1), as shown in Illustration 1. Weld the pipe assembly plate to the bottom side of the upper frame plate at four equally spaced locations using a 5 mm fillet x 25.4 mm long weld.

  3. Insert the existing flex pipe into the new pipe.


    Illustration 2g06130716
    (1) 8T-6703 Hose Clamp
    (2) 507-7544 Insulation As
    (3) 514-9251 Pipe As

  4. Wrap insulation (2) over flex pipe (3).

  5. Finish by clamping the insulation to the pipe using clamp (1), as shown in Illustration 2.

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