VT-30, VT-40, VT-50 and VT-60 Multi-Processors Gerotor Motor Leakage

Gerotor Motor Leakage - Test

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

VT-30, VT-40, VT-50 and VT-60 Multi-Processors Gerotor Motor Leakage - Test

VT-30, VT-40, VT-50 and VT-60 Multi-Processors Swivel Leakage - Test

HYDRAULIC SYSTEM

MOTOR GP

MP-15, MP-20, MP-30 and MP-40 Multi Processors Gerotor Motor

MP-15, MP-20, MP-30 and MP-40 Multi Processors Gerotor Motor - Disassemble

MP-15, MP-20, MP-30 and MP-40 Multi Processors Gerotor Motor - Assemble

VT-30, VT-40, VT-50 and VT-60 Multi-Processors Gerotor Motor Leakage - Test

MP15, MP20, MP30 and MP40 Multi-Processors Gerotor Motor - Install

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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.

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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 ⁽¹⁾ 25000 kPa (3620 psi)	1

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^( 1 )

Part of 4C-4892 ORFS Fittings Group

Inspect the rotate circuit for external leakage. If a leak is found, perform the necessary repairs. If there is no sign of leakage, proceed to the next step.

Check the control valve for the proper operating pressure. Refer to Service Manual, "Control Valve Pressure (Hydraulic Rotator) - Test". The control valve must be operating at the proper pressure in order for this test to be valid.

Adjust the pressure of the host machine for the rotate circuit to 12000 ± 500 kPa (1740 ± 70 psi). Refer to the Service Manual for the host machine for the proper procedures.

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

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Illustration 1	g01894897
(1) Pressure tap ROTATE

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Illustration 2	g01894898
(CW) Rotate circuit clockwise and (CCW) Rotate circuit counterclockwise

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Illustration 3	g01895054
(1) Pressure tap ROTATE (2) Hose assembly

Remove hose assembly (2) from the coupling on the work tool. Plug the hose and cap the fitting on the coupling. This will prevent oil from returning to the hydraulic tank.
Note: Hose assembly (2) is the connecting line from the host machine to the coupling on the work tool.

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

Attempt to rotate the work tool in a clockwise direction. Note any increase in the hydraulic pressure at pressure tap (1) .

If there is an increase in the hydraulic pressure, the gerotor motor(s) must be repaired. Refer to Service Manual, "Gerotor Motor - Disassemble".
Note: This work tool has two gerotor motors. Either one gerotor motor or both gerotor motors could be faulty.

Stop the engine of the host machine.

Release the hydraulic pressure in the hydraulic system. Refer to the Service Manual for the host machine for the procedure to release the hydraulic pressure.

Install hose assembly (2) to the coupling on the work tool.

The air must be purged from the work tool before the tool is returned to operation. Refer to Service Manual, "Hydraulic System Air - Purge" for the proper procedure.

Start the engine of the host machine. Raise the work tool from the ground. Operate all of the functions of the work tool. Inspect the work tool for hydraulic leaks. Repair any hydraulic leaks before you operate the work tool.