785D OEM Off-Highway Truck Machine Systems Caterpillar


Relief Valve (Steering) - Remove and Install

Usage:

785D DMC

Removal Procedure

Start By:

  1. Install the wheel chocks. Refer to Disassembly and Assembly, "Wheel Chocks (Front and Rear) - Remove and Install".


NOTICE

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, PERJ1017, "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.


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

Personal injury can result from the sudden release of high pressure oil.

Be sure the engine has been shut off for a minimum of five minutes to ensure that the accumulator pressure is zero.

The accumulator is filled with dry nitrogen. Do not loosen or remove the valve or the cap from the top of the accumulator.


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

At operating temperature, the hydraulic tank is hot and under pressure.

Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

Remove the filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. Remove the filler cap slowly in order to relieve pressure.



NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.


Note: Put identification marks on all hose assemblies and on all tube assemblies for installation purposes. Plug all hose assemblies and all tube assemblies. This helps to prevent fluid loss and this helps to keep contaminants from entering the system.

  1. Drain the hydraulic oil from the steering system into a suitable container for storage or disposal. Refer to Operation and Maintenance Manual, "Steering System Oil - Change".


    Illustration 1g01586154

  2. Remove relief valve (1).


    Illustration 2g01586197

  3. Remove O-ring seals (2).

Installation Procedure


NOTICE

Keep all parts clean from contaminants.

Contaminants may cause rapid wear and shortened component life.


Note: Inspect the O-ring seals. Replace the O-ring seals that are worn or damaged.

Note: Lubricate all of the O-ring seals lightly with the lubricant that is being sealed.



    Illustration 3g01586197

  1. Install O-ring seals (2).


    Illustration 4g01586154

  2. Install relief valve (1) onto valve assembly (2). Tighten relief valve (1) to a torque of 65 ± 5 N·m (48 ± 4 lb ft).

  3. Fill the steering hydraulic tank. Refer to Operation and Maintenance Manual, "Steering System Oil - Change".

End By:

  1. Remove the wheel chocks. Refer to Disassembly and Assembly, "Wheel Chocks (Front and Rear) - Remove and Install".

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