336D 2L and 340D 2L Excavators Machine Systems Control Manifold (Pilot Oil) - Remove and Install Caterpillar


Control Manifold (Pilot Oil) - Remove and Install
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1.1. Removal Procedure
2.1. Installation Procedure

Removal Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
FT-2674  Vacuum Cap 

Start By:

a. Release the hydraulic system pressure.


NOTICE

Keep all parts clean from contaminants.

Contamination of the hydraulic system with foreign material will reduce the service life of the hydraulic system components.

To prevent contaminants from entering the hydraulic system, always plug or cap the lines, fittings, or hoses as they are disconnected. Cover any disassembled components and clean them properly before assembly.

Clean the hydraulic system properly after any major component exchange or especially after a component failure, to remove any contamination.



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, 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.


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

Personal injury can result from hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.




    Illustration 1g00704703

  1. Remove bolts (2) to remove access cover (1) that is under the main control valve.


    Illustration 2g00690963

  2. Remove the cap from the hydraulic tank. Install Tooling (A) onto the hydraulic tank. Attach an air supply hose to Tooling (A). Apply 276 kPa to 414 kPa (40 psi to 60 psi) of air. This procedure will pull vacuum on the hydraulic system.

    Note: A small amount of oil will drain from all the hose assemblies when the hose assemblies are disconnected from the pilot manifold. Make sure that you contain the hydraulic oil.

  3. Put identification marks for all the hose assemblies that are connected to the pilot manifold for installation purposes.


    Illustration 3g06035116

  4. Disconnect harness assemblies (3) from control manifold (5).

  5. Disconnect hose assemblies (4).


    Illustration 4g06036629

  6. Disconnect hose assemblies (6), (7), (8), (9), (10), (11), and (12).


    Illustration 5g06036631

  7. Disconnect hose assemblies (13), (14), (15), (16), (17), (18), and (19).


    Illustration 6g06036632

  8. Disconnect hose assembly (20). Remove bolts (21) and control manifold (5).

Installation Procedure


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, 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.




    Illustration 7g00690963

  1. Remove the cap from the hydraulic tank. Install Tooling (A) onto the hydraulic tank. Attach an air supply hose to Tooling (A). Apply 276 kPa to 414 kPa (40 psi to 60 psi) of air. This procedure will pull vacuum on the hydraulic system.


    Illustration 8g06036632

  2. Position control manifold (5) and install bolts (21). Connect hose assembly (20).


    Illustration 9g06036631

  3. Connect hose assemblies (13), (14), (15), (16), (17), (18), and (19).


    Illustration 10g06036629

  4. Connect hose assemblies (6), (7), (8), (9), (10), (11), and (12).


    Illustration 11g06035116

  5. Connect hose assemblies (4).

    Note: A small amount of oil will drain from all the hose assemblies when the plugs are removed from the hose assemblies. Make sure that you contain the hydraulic oil.

  6. Connect harness assemblies (3) to the control manifold (5).

  7. Remove Tooling (A) and install the cap to the hydraulic tank.

  8. Install high efficiency filters in place of the pilot filter, the case drain filter, and the return filter.

    Note: High efficiency filters should not be run for more than 250 hours before you change back to the standard filters.



    Illustration 12g00704703

  9. Position access cover (1) and install bolts (2) under the main control valve.

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