320E RR Excavator Machine Systems Caterpillar

Main Control Valve - Remove and Install

Usage:

Removal Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	138-7573	Link Bracket	2
B	311-1362	Vacuum Gauge Gp	1

Start By:

Release the system pressure.

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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.

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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 attachments have been lowered, 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.

Drain the hydraulic tank into a suitable container for storage or disposal. Refer to Operation and Maintenance Manual, "Hydraulic System Oil - Change".
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Illustration 1 g02719994
Install Tooling (B) onto the hydraulic tank (1). Attach an air supply hose onto Tooling (B). Apply 276 to 414 kPa (40 to 60 psi). This procedure will pull a vacuum on the hydraulic system.
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Illustration 2 g02718900
Remove plate (1).
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Illustration 3 g02718914

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Illustration 4 g02718917
Remove bolts (2) and (3).
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Illustration 5 g02718918
Attach Tooling (A) and a suitable lifting device to cover (4). Remove cover (4)
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Illustration 6 g02718922
Disconnect hose assemblies (5).
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Illustration 7 g02719012
Remove bottom guard (6)
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Illustration 8 g02719015
Loosen up bracket (7) in order to reposition tube assemblies (8).
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Illustration 9 g02719016
Disconnect all tube assemblies (9).
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Illustration 10 g02719022
Disconnect hose assemblies (10). Disconnect harness assembly (11).
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Illustration 11 g02719298
Disconnect all hose assemblies (12) from bottom
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Illustration 12 g02719299
Remove bolts (13) and bracket (14).
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Illustration 13 g02719798
Disconnect hose assembly (15).
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Illustration 14 g02719800
Disconnect hose assemblies (16).
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Illustration 15 g02719887
Disconnect all hose assemblies (17) from top of main control valve.
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Illustration 16 g02719907
Disconnect hose assemblies (18).
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Illustration 17 g02719909
Disconnect harness assemblies (19).
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Illustration 18 g02719910
Disconnect all hose assemblies (20).
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Illustration 19 g02719913
Disconnect harness assemblies (21) and remove all clips (22).
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Illustration 20 g02719943
Disconnect hose assemblies (23).
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Illustration 21 g02719944
Disconnect hose assemblies (24)
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Illustration 22 g02719945
Remove bolts (25).
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Illustration 23 g02719949
Attach Tooling (A) and a suitable lifting device to main control valve (26). The weight of main control valve (26) is approximately 322 kg (710 lb). Remove main control valve (26).