336E Excavator and 336E MHPU Mobile Hydraulic Power Unit Machine Systems Auxiliary Pilot Valve (Straight Travel) - Remove and Install Caterpillar

Removal Procedure

Start By:

1. Release the hydraulic system pressure.

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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.

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Illustration 1	g02138737

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 to 414 kPa (40 to 60 psi) of air. This procedure will pull vacuum on the hydraulic system.
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   Illustration 2	g02155365

2. Remove bolts (1) and plate assembly (2).
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   Illustration 3	g02155773

3. Disconnect harness assembly (4) and hose assemblies (6). Remove pressure switch (5) and fittings (3).
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   Illustration 4	g02155774

4. Remove bolts (8) and pedal (7).
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   Illustration 5	g02155775

5. Remove bolts (9) and auxiliary pilot valve (10).

Installation Procedure

1. Install auxiliary pilot valve (10) in the reverse order of removal.

   1. Tighten bolts (8) to a torque of 17 ± 2 N·m (150 ± 18 lb in).

   2. Apply Tooling (B) to the threads of bolts (1).