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 Control Valve Pressure (Hydraulic Rotator) - Test

VT-30, VT-40, VT-50 and VT-60 Multi-Processors Hydraulic Cylinder Leakage - 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 the Service Manual for the host machine for the proper procedure. Adjust the pressure to approximately 20000 kPa (2900 psi).

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Illustration 1	g02045075
Typical Example (CW) Rotate the rotator clockwise. (CCW) Rotate the rotator counterclockwise. (1) Test fitting (2) Test fitting (3) Control valve

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. Apply enough pressure to the work tool in order to prevent the work tool from rotating.

Attempt to rotate the work tool clockwise. Record the reading on the pressure gauge.

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

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

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. Apply enough pressure to the work tool in order to prevent the work tool from rotating.

Attempt to rotate the work tool counterclockwise. Record the reading on the pressure gauge.

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

The pressure at each test fitting should be 14000 ± 1000 kPa (2031 ± 145 psi). If the pressures are within the specification, the control valves are working properly. If the pressures are not within the specification, control valve (3) are not working properly.
Note: Control valve (3) cannot be adjusted. If the pressures are not within the specification, replace control valve (3) .