Installation of the 291-7758 Medium Pressure Wiring {1408} Caterpillar

Excavator:

345D (S/N: HLC1-UP; RGD1-UP; RAE1-UP; YEE1-UP; NEG1-UP; RGG1-UP; EEH1-UP; KFH1-UP; RAJ1-UP; MLK1-UP; NLM1-UP; JKN1-UP; L5R1-UP; PBT1-UP; LKY1-UP)

349D (S/N: JGB1-UP; NNF1-UP; PZG1-UP; RBJ1-UP; MEN1-UP; KHS1-UP)

Mobile Hydraulic Power Unit:

312D MHPU (S/N: L5W1-UP)

345D MHPU (S/N: P5D1-UP)

349D MHPU (S/N: DKN1-UP)

Introduction

The Special Instruction, GEHS0432 is for the installation of the 291-7758 Medium Pressure Wiring "Revision level - 03". If you need more information about the installation of the Medium Pressure Wiring on your machine, consult your Cat dealer.

Do not perform any procedure that is outlined in this publication without reading this article first.

Safety Section

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Do not operate or work on this machine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manuals. Failure to follow the instructions or heed the warnings could result in injury or death. Contact your Cat dealer for replacement manuals. Proper care is your responsibility.

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Personal injury or death can result from sudden work tool movement. Sudden movement of the work tool can cause injury to persons near the work tool. To prevent injury or death, make sure that the area around the work tool is clear of personnel and obstructions before operating the work tool.

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 before you service the equipment. These warning tags (Special Instruction, SEHS7332) are available from your Caterpillar dealer.

Required Parts

Illustration 2	g03112499

Installation Procedure

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Illustration 3	g03112718
Radiator room and engine room (3) 7K-1181 Cable Strap (4) 291-7856 Valve Harness As

1. Connect harness (4) to chassis harness in the radiator compartment as shown.

2. Route harness (4) into the engine compartment.

3. Route harness (4) across the front of the engine compartment and into the pump compartment.

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Illustration 4	g03113036
Close up view inside engine and pump room (1) 3S-2093 Cable Strap (2) 6G-2263 Spacer (3) 7K-1181 Cable Strap (4) 291-7856 Valve Harness As (5) 132-5789 Clip (6) 8T-4121 Hard Washer (7) 8T-4185 Bolt (8) 3S-2093 Cable Strap (for system 3, 5, 14, 16 and 17)

4. Connect harness (4) to the STEM3 Extend and Retract solenoids of 259-7430 Solenoid Valve Gp as shown.

5. Install clip (5), spacer (2), bolt (7) and washer (6) as shown.

6. Secure harness (4) to clip (5) using strap (3). Secure the rest of the harness with straps (1), (3), and (8) (if applicable).

7. Unless otherwise specified, tighten all hardware and fittings to standard torque.

   ReferenceTorque Specifications, SENR3130, "Torque Specifications"