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

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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.

Jaw Circuit

1. 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.

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Illustration 1	g01897494

2. Install Tooling (A) and Tooling (B) on test fitting (1) .

   Note: You may also use the pressure gauge on Tooling (C) to check the pressure. Install Tooling (A) and (C) between two hoses (2) for the jaw circuit. Close the valve on the flow meter in order to check pressure.

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

4. Open the jaws of the work tool. Close the jaws and continue to hold the control in the CLOSE position in order to allow the cylinder to stall. Observe the pressure on the gauge. The pressure should be 35000 ± 2500 kPa (5075 ± 360 psi). If the pressure is not within the specification, the pressure must be adjusted accordingly. Refer to the Service Manual for the host machine for the proper procedure.

5. After adjustments have been made, stop the engine on the host machine and relieve the hydraulic pressure.

6. Disconnect two hose assemblies (2) from the work tool. The two hoses complete the circuit from the host machine to the jaw circuit of the work tool. Plug the couplings on the work tool in order to prevent contamination.

7. Install Tooling (A) and Tooling (C) between the two hoses.

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

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Illustration 2	g01897534
(B) Close (O) Open (CW) Rotate the rotator clockwise. (CCW) Rotate the rotator counterclockwise.

Note: Some flow meters will only measure flow in one direction. Ensure that the control is selected for the corresponding direction of the flow meter. Tooling (C) will measure flow in either direction.

9. Operate the control on the host machine for the jaw circuit. Observe the flow on the meter. Refer to Table 2 for the flow specifications. If the flow is not within the specification, the flow must be adjusted accordingly. Refer to the Service Manual for the host machine for the proper procedure.
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   Table 2

   Sales Model	Flow for the Jaw Circuit
   VT-30	150 ± 25 L/min (39.6 ± 6.6 US gpm)
   VT-40	200 ± 25 L/min (52.8 ± 6.6 US gpm)
   VT-50	300 ± 50 L/min (79.3 ± 13.2 US gpm)

10. After adjustments have been made, stop the engine on the host machine and relieve the hydraulic pressure. Remove the tooling and install the two hose assemblies.

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

Rotate Circuit

1. 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.

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Illustration 3	g01897494

2. Disconnect two hose assemblies (3) from the work tool. The two hoses complete the circuit from the host machine to the rotate circuit of the work tool. Plug the couplings on the work tool in order to prevent contamination.

3. Install Tooling (A) and Tooling (B) between the two hoses.

   Note: You may also use the pressure gauge on Tooling (C) to check the pressure. Install Tooling (A) and (C) between two hoses (3) for the rotate circuit. Close the valve on the flow meter in order to check pressure.

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

5. Start the engine of the host machine. operate the control on the host machine for the rotate circuit. Observe the pressure on the gauge. The pressure should be 14000 ± 1000 kPa (2030 ± 145 psi). If the pressure is not within the specification, the pressure must be adjusted accordingly. Refer to the Service Manual for the host machine for the proper procedure.

6. After adjustments have been made, stop the engine on the host machine and relieve the hydraulic pressure.

7. Install Tooling (A) and Tooling (C) between the two hoses.

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Illustration 4	g01897534
(B) Close (O) Open (CW) Rotate the rotator clockwise. (CCW) Rotate the rotator counterclockwise.

Note: Some flow meters will only measure flow in one direction. Ensure that the control is selected for the corresponding direction of the flow meter. Tooling (C) will measure flow in either direction.

8. Operate the control on the host machine for the rotate circuit. Observe the flow on the meter. The flow should be 40 ± 5 L/min (10.6 ± 1.3 US gpm). If the flow is not within the specification, the flow must be adjusted accordingly. Refer to the Service Manual for the host machine for the proper procedure.

9. After adjustments have been made, stop the engine on the host machine and relieve the hydraulic pressure. Remove the tooling and install the two hose assemblies.

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