621K, 623K and 627K Wheel Tractor-Scrapers Engine Supplement Caterpillar


Exhaust Gas Valve (NRS) - Remove and Install

Usage:

621K WTA

Removal Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
207-1601  Rubber Lubricant 


    Illustration 1g02848005

  1. Disconnect harness assemblies (1) and disconnect tube assemblies (2).

  2. Loosen clamp (4) and remove tube assembly (3). Discard clamp (4) and the O-ring seals.


    Illustration 2g02848045

  3. Loosen clamps (6) and remove hose (7).

  4. Remove bolts (9), clip (8), and exhaust control valve (5).

Installation Procedure

  1. Install exhaust control valve (5) in the reverse order of removal.

    1. Apply Tooling (A) to the O-ring seals and the venturi-side bore of tube assembly (3).

    2. Tighten clamps (4) to a torque of 8.5 ± 2 N·m (75 ± 18 lb in).

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