HEAD 4J7994 - Caterpillar

Removal Procedure
Start By:
Remove exhaust shields
Remove exhaust bypass valve
Table 1
Required Tools
Tool Part Number Part Description Qty
A 138-7573 Link Bracket 2
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Turn the engine control switch to the OFF/RESET position.
Drain the coolant. Refer to Operation and Maintenance Manual, "Cooling System Coolant (ELC) - Change" for the correct draining and filling procedures.
Illustration 1 g01282266
Typical example.
Attach Tooling (A) and a suitable lifting device to exhaust elbow (1). The weight of exhaust elbow (1) is approximately 40 kg (87 lb).
Illustration 2 g06004780
Disconnect line assembly (2) .
Remove clamp (3) and disconnect the tube assembly.
Illustration 3 g06004817
Remove bolts (4) and bolts (5).
Disconnect harness assembly (6) from the sensors.
Remove exhaust elbow (1) and the gaskets from the engine.Installation Procedure
Install exhaust elbow (1) in reverse order of removal.