VT-30, VT-40, VT-50 and VT-60 Multi-Processors Control Valve Pressure (Hydraulic Rotator)

Control Valve Pressure (Hydraulic Rotator) - Test

VT-30, VT-40, VT-50 and VT-60 Multi-Processors [RENR4471]

VT-30, VT-40, VT-50 and VT-60 Multi-Processors Hydraulic System Air - Purge

VT-30, VT-40, VT-50 and VT-60 Multi-Processors Control Valve Pressure (Hydraulic Rotator) - Test

HYDRAULIC SYSTEM

VALVE GP

VT-30, VT-40, VT-50 and VT-60 Multi-Processors Control Valve Pressure (Hydraulic Rotator) - Test

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	4C-4892	ORFS Fittings Group	1
A	8T-0859	Pressure Gauge 25000 kPa (3620 psi)	1

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At operating temperature, the hydraulic oil is hot and under pressure. Hot oils can cause burns.
To prevent possible personal injury, release the pressure in the work tool hydraulic circuit (boom, stick, bucket, and swing), travel circuits, and the hydraulic oil tank at the filler cap before any hydraulic lines or components are disconnected or removed.

Remove the filler cap only when the engine is stopped and the filler cap is cool enough to touch.

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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 machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Dispose of all fluids according to local regulations.

Adjust the hydraulic pressure that is supplied to the rotate circuit. Refer to Service Manual for the host machine for the proper procedure. Adjust the pressure to 20000 kPa (2900 psi).

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Illustration 1	g01884533
(CCW) Rotate the rotator counterclockwise. (CW) Rotate the rotator clockwise.

Install tooling (A) to test fitting (1) .

Start the engine of the host machine. Operate the host machine until the hydraulic oil reaches normal operating temperature.

In order to prevent rotation, rotate the work tool to a horizontal position. Place the work tool on the ground. In order to prevent the work tool from rotating, apply pressure in a downward direction.

Attempt to rotate the work tool to the right. Record the reading on the pressure gauge. The pressure should be 14000 ± 1000 kPa (2031 ± 145 psi). Record the pressure.

Lower the work tool to the ground and stop the engine of the host machine. Relieve the pressure from the hydraulic system. Refer to the Service Manual for the host machine for the proper procedure.

Remove Tooling (A) from test fitting (1) .

If the pressure was not within the specification, replace the control valve. If the pressure was within the specification, proceed to the next step.

Install tooling (A) to test fitting (2) .

Start the engine of the host machine.

In order to prevent rotation, rotate the work tool to a horizontal position. Place the work tool on the ground. In order to prevent the work tool from rotating, apply pressure in a downward direction.

Attempt to rotate the work tool to the left. Record the reading on the pressure gauge. The pressure should be 14000 ± 1000 kPa (2031 ± 145 psi). Record the pressure.

Lower the work tool to the ground and stop the engine on the host machine. Relieve the pressure from the hydraulic system and remove the tooling.

If the pressure was not within the specification, replace the control valve. If the pressure was within the specification, the control valve is working properly.