Procedure to Relocate the Air Conditioning Pressure Switch on Certain 773E Off-Highway Trucks {1808} Caterpillar

Off-Highway Truck/Tractor

773E (S/N: PRB1-170; KEG1-339; ASK1-1498; DJS1-1)

Introduction

Do not perform any procedure in this special instruction until you have read the information and you understand the information. This special instruction provides the parts and procedure to replace the existing dryer and relocate the air conditioning pressure switch.

Caterpillar Channel 1 Videos

For supplemental information on this procedure, refer to the following video. The previous training has been replaced with the video below.

Note: A CWS login is required to access Caterpillar Channel 1. Scan the QR code below with a QR enabled device or copy the link that follows.

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Safety Information

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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

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

Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards, including human factors that can affect safety. This person should also have the necessary training, skills, and tools to perform these functions properly.

The information, specifications, and illustrations in this publication are based on information that was available at the time that the publication was written. The specifications, torques, pressures, measurements, adjustments, illustrations, and other items can change at any time. These changes can affect the service that is given to the product. Obtain the complete and most current information before you start any job. Cat dealers have the most current information available.

General Information

Graphic Color Description

Color-coding of targeted components, or sections of a part, is used to communicate a required action.

The descriptions below illustrate the different colors and what is represented when used in a graphic.

(Blue) The primary component of focus for a particular step. Target or primary component to be installed or removed. Installation implied unless otherwise noted with a symbol.

(CAT® Yellow) Description of parts.

(Yellow) Components disconnected, connected, or placed aside for access, but not removed. Highlighted areas of adjustment, inspection, or special attention.

(Cyan) Special tools or other equipment required for use in a particular step.

(Light Gray) Components used for reference.

(Magenta) Any fastener, retainer, or electrical connector used to install or remove the primary component.

Graphic Symbol Description

This section includes all the symbol graphics used throughout the Visual Service Procedure (VSP), along with a brief description of what the symbol represents.

Discard, Do Not Reuse - To cast aside as useless or undesirable in approved and responsible manner.

Drill - To pierce to make a hole with a drill.

Dumper Hauler - Body Float

Keep, Store - To retain for reinstallation or reuse.

Level - To position a surface in a horizontal orientation. To position in vertical dimension. To align to assist positioning a surface in a horizontal orientation.

Loosen - To make less tight. To set free. To release.

Lubricate, Oil - To apply a material to a surface to reduce

Measure - To determine the dimension, area, volume, or other quantifiable property of an object. A desired quantity of something.

Operation and Maintenance Manual - Refer to a procedure in an Operation and Maintenance Manual.

Parking Brake

Position - To locate to the desired or intended location.

Relieve Pressure - To eliminate the pressure or force on a part or system to reduce a pressure, load, or weight on a device.

Remove - To take off.

Replace - To restore, or return, to a former or proper place.

Tighten - To make nearer to fully stretched, without slack, to apply tension or torque.

Weld - To join by heating until liquid portions of two or more pieces of metal in contact with each other and allowing the common puddle to solidify.

Wheel Chock - Wedges placed closely against the wheels of the machine to prevent accidental movement.

Torque Specifications

English (SAE) Fasteners

The following table has the recommended standard torque values.

Metric (ISO) Fasteners

The following table has the recommended standard torque values.

Machine Preparation

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Refer to Operation and Maintenance Manual, SEBU8394, Prepare the Machine for Maintenance Refer to Operation and Maintenance Manual, SEBU9389, Prepare the Machine for Maintenance for machines with PRB and DJS prefixes.

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Refer to Operation and Maintenance Manual, SEBU8394, Parking Refer to Operation and Maintenance Manual, SEBU8394, System Pressure Release Refer to Operation and Maintenance Manual, SEBU9389, Parking and System Pressure Release for machines with PRB and DJS prefixes.

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Refer to Operation and Maintenance Manual, SEBU8394, Operator Controls Refer to Operation and Maintenance Manual, SEBU9389, Operator Controls for machines with PRB and DJS prefixes.

Required Parts

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Removal Procedure

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Procedure to fabricate 533-0572 Plate

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(D1) 30 mm (1.2 inch) (D2) 40 mm (1.6 inch) (D3) 15 mm (0.6 inch) (D4) 3 mm (0.2 inch) (D5) 40 mm (1.6 inch) (D6) 15 mm (0.6 inch) (D7) 38 mm (1.5 inch) (D8) 26.8 mm (1.1 inch) (D9) 190 mm (7.85 inch) (D10) 90 degrees (D11) 140 mm (5.5 inch) (D12) 25 mm (1.0 inch) (R1) 3 mm (0.2 inch)

Installation Procedure

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(1) Refer to Special Instruction, REHS1841, "General Welding Procedure" (D1) 19 mm (0.7 inch) (D2) 76 mm (3.0 inch) (W1) 3 mm (0.12 inch) fillet weld

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Reference Section

• Refer to Testing and Adjusting, SENR5664, "Refrigerant System - Evacuate"

• Refer to Testing and Adjusting, SENR5664, "Refrigerant Leakage - Test"

• Refer to Testing and Adjusting, SENR5664, "Refrigerant System - Charge"