VALVE AS-BRAKE 4328144 - Caterpillar

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(1) Main Control Valve (2) Typical Line Relief
Remove line relief valve (2) from hydraulic control valve body (1) .Note: Check the valve seat face of the line relief valve for damage, wear, or erosion and replace the valve, if necessary. Damage to the valve seat and valve may also indicate contamination within the hydraulic system.
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Select Adapter
Measure the diameter of the relief valve port and select the proper adapter and cutter from the 229-3612 Repair Kit .
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(3) Tool Body (4) Adapter (5) Cutter
Assemble selected adapter (4) onto tool body (3) and tighten the adapter with a suitable wrench.
Assemble selected cutter (5) on the stem of the tool body and tighten with a suitable wrench.
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Insert Task Wipes into Valve Ports
Insert a small piece of 166-6384 Lint-Free Critical Task Wipe into all openings in the port of the hydraulic control valve body.
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(1) Valve Body (3) Tool Body Assembly (4) Adapter (5) Cutter
Install tool assembly (3) in the hydraulic control valve body port and hand tighten with a suitable wrench.
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(1) Valve Body (3) Tool Body Assembly
Using slight downward hand-pressure, rotate the knob of tool body (3) clockwise 2 to 3 complete rotations or until the carbide cutter has removed the necessary material to restore the valve seat. A maximum of 0.5 mm (.020 inch) may be removed from the seat.
Remove the tool body from the control valve body port.
Check the valve seat to ensure a complete seal.
Coat the seat face of the relief valve with 9U-6075 Toolmaker's Ink or 9U-6076 Toolmaker's Ink .
Install the relief valve and tighten it to the specified torque.
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Check for Complete Seal using Toolmakers Ink
Remove the valve and visually inspect the valve seat in the valve body.
If the blue ink has transferred from the seat face of the relief valve to the valve seat in the valve body in a continuous, non-interrupted line, then the seal face is restored.
If the blue ink line is not continuous, reinstall the tool and remove additional material.
If the blue ink does not transfer, too much material has been removed and the valve body must be replaced.
If the valve body is reusable, remove the toolmaker's ink from the valve seat and the relief valve using 9U-6077 Toolmakers Ink Remover .
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Remove Foreign Object and Flush With Cleaner
Use 138-8440 Component Cleaner to flush the port and remove any excess debris from the control valve body. Use a 5P-1720 Seal Pick and carefully remove any metal shavings and the lint-free critical task wipe from the control valve port.Note: Stamp or mark the valve to show how many times this process has been done.
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(1) Valve Body (2) Relief Valve
Install relief valve (2) into control valve body (1) and tighten it to recommended torque specifications.
Before operating the machine, install a high-efficiency clean-out filter. Start the machine, and without using any implements, let the machine run for 30 minutes. For additional information on high-efficiency clean out filters, refer to PEHP5042 Clean Out Filters.
Finally, take an S