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Hydraulic oil pressure can remain in the hydraulic system on this machine after the engine and pump have been stopped. Serious injury can result if this pressure is not released before any service is done on the hydraulic systems. In order to prevent possible injury, release the hydraulic system pressure before working on any fitting, hose, or hydraulic component. Lower all attachments to the ground before service is started. If the hydraulic system must be serviced, tested, or adjusted with the attachment in the raised position, the attachments and lift cylinders must be supported properly. Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made. |
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| NOTICE |
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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 and mandates. |
Introduction
The torque converter inlet relief valve limits the maximum pressure to the torque converter section of the torque divider. The torque converter inlet relief valve also prevents damage to the torque converter when the engine is started and the oil is cold.
The following test will check the maximum pressure of the oil that is delivered to the torque converter section of the torque divider. The pressure setting of the torque converter inlet relief valve is not adjustable.
Required Tools
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| Illustration 1 | g01089423 |
Tooling (A) | |
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| Illustration 2 | g01089425 |
Tooling (B) ( 6V-7830 Pressure Gauge (Tetragauge)) | |
| Required Tools | ||||
|---|---|---|---|---|
| Tooling | Item | Part Number |
Description | Qty |
| A | A1 | 8T-0855 | Pressure Gauge 4000 kPa (580 psi) |
1 |
| 8T-0861 | Pressure Gauge 60000 kPa (8700 psi) |
1 | ||
| A2 | 6V-3989 | Fitting | 1 | |
| A3 | 6V-4143 | Coupler | 2 | |
| A4 | 177-7861 | Hose As 41370 kPa (6000 psi) |
1 | |
| B | B1 | 8T-0862 | Pressure Gauge 500 kPa (72 psi) |
1 |
| B2 | 8T-0860 | Pressure Gauge 40000 kPa (5800 psi) |
1 | |
| B3 | 8T-0855 | Pressure Gauge 4000 kPa (580 psi) |
1 | |
| B4 | 6V-3081 | Hose As 41500 kPa (6020 psi) |
1 | |
| B5 | 4S-6399 | Connector | 1 | |
| B6 | 6V-4144 | Coupler | 1 | |
Test Procedure
- Move the machine to a smooth horizontal location.
- Fully retract the counterweight.
- Attach tooling (A or B) to pressure tap (44) ("M").
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| Illustration 3 | g01247618 |
(44) Pressure Tap for Torque Converter Inlet Relief Valve ("N") | |
- Start the engine. Do not warm the power train oil.
Note: You will only achieve these results if the power train oil is less than 40 °C (104 °F).
- Make sure that the steering control lever is in the NEUTRAL position. Operate the engine starting at LOW IDLE (700 rpm) and slowly increase the speed.
- Watch the pressure at tooling (A or B). The pressure should rise with the engine speed until the pressure reaches 900 ± 70 kPa (130 ± 10 psi).
- The torque converter inlet relief valve is not adjustable. If the pressure continues to rise above 900 ± 70 kPa (130 ± 10 psi), replace the relief valve.
Note: Torque converter inlet relief valve (19) is inside the case behind the lower portion of lubrication distribution manifold (20) .
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| Illustration 4 | g01107368 |
(19) Torque Converter Inlet Relief Valve (20) Lubrication Distribution Manifold | |