VT-30, VT-40, VT-50 and VT-60 Multi-Processors Hydraulic Rotator Oil Flow

Hydraulic Rotator Oil Flow - Test

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

VT-30, VT-40, VT-50 and VT-60 Multi-Processors Host Machine Pressure and Flow - Test

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

HYDRAULIC SYSTEM

ROTATOR GP

MP-15, MP-20, MP-30 and MP-40 Multi Processors Hydraulic Rotator

MP15, MP20, MP30 and MP40 Multi-Processors Hydraulic Rotator Cycle Time - Check

VT-30, VT-40, VT-50 and VT-60 Multi-Processors Hydraulic Rotator Oil Flow - Test

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

MP15, MP20, MP30 and MP40 Multi-Processors Hydraulic Rotator and Multi-Processor Housing - Separate

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	4C-4892	ORFS Fittings Group	1
A	4C-9910	Flow Meter 48200 kPa (7000 psi) 13 L/min to 473 L/min (4 US gpm to 125 US gpm)	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.

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Illustration 1	g00726171
VT-30, VT-40, and VT-50

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Illustration 2	g00730125
VT-60

Disconnect hose assembly (1).

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Illustration 3	g00727816

Remove the two bolts and the washers that secure coupling (3) to the upper housing. Pull the coupling forward and disconnect the hose assembly from the rear of the coupling.

Install Tooling (A) in either direction between hose (1) and the hose from the rear of the coupling.

Start the host machine. Run the host machine at high idle and operate the implements until the hydraulic oil reaches normal operating temperature.

Rotate the work tool. Ensure that the direction of the rotation corresponds with the direction of flow of Tooling (A). Record the reading on the flow meter. Refer to Table 2 for the appropriate flow specification.

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Table 2
Sales Model	Specifications for Flow Rate L/min (US gpm)
VT-30	40 ± 5 L/min (10.6 ± 1.3 US gpm)
VT-40
VT-50
VT-60	80 ± 5 L/min (21.1 ± 1.3 US gpm)

Remove Tooling (A) from the work tool.

Ensure that the O-ring seals are properly positioned and connect the two hoses to the coupling.

Disconnect hose assembly (2). Refer to Illustration 1 or Illustration 2.

Remove the two bolts and the washers that secure coupling (4) to the upper housing. Pull the coupling forward and disconnect the hose assembly from the rear of the coupling. Refer to Illustration 3.

Install Tooling (A) in either direction between hose (2) and the hose from the rear of the coupling.

Start the host machine.

Rotate the work tool. Ensure that the direction of the rotation corresponds with the direction of flow of Tooling (A). Record the reading on the flow meter. Refer to Table 2 for the appropriate flow specification.

Remove Tooling (A) from the work tool.

Ensure that the O-ring seals are properly positioned and connect the two hoses to the coupling.

Refer to the list below for the corresponding results to the test:
- If the flow was within the specification and the cycle times were not within the specification in either direction, the seals in the motor may be faulty. Check the gerotor motor for internal leakage. Refer to Service Manual, "Gerotor Motor Leakage - Test".
- If the flow was within the specification and the cycle time in only one direction was not within the specification, the control valve may be faulty. Check the control valve for proper operation. Refer to Service Manual, "Control Valve Pressure (Hydraulic Rotator) - Test".
- If the flow meter reading in Step 5 was not within the specification, replace the flow control valve in coupling (4). Refer to Step 16.
- If the flow meter reading in Step 12 was not within the specification, replace the flow control valve in coupling (3). Refer to Step 16.
- If both of the meter readings were not within the specification, replace both of the flow control valves. Refer to Step 16.

Perform the following steps in order to remove the flow control valves.
1. Remove adapter (3) .
1. Use a 5 mm hex key wrench in order to remove flow control valve (4) .
1. Replace the faulty valve.

After the tests and any maintenance has been completed, connect the couplings to the upper housing. Apply 9S-3263 Thread Lock Compound to the two bolts that secure each coupling and install the bolts and the washers.

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.