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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 outlet relief valve maintains a minimum pressure in the torque converter.
The following test procedure will verify whether the pressure setting is within the specified limits. The pressure setting may be adjusted by adding or removing shims.
Required Tools
 | |
| Illustration 1 | g01089423 |
Tooling (A) | |
 | |
| Illustration 2 | g01089425 |
Tooling (B) ( 6V-7830 Pressure Gauge (Tetragauge)) | |
| Required Tools | ||||
|---|---|---|---|---|
| Tooling | Item | Part Number |
Description | Qty |
| A | A1 | 8T-0854 | Pressure Gauge 1000 kPa (145 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 (45) ("N").
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| Illustration 3 | g01247596 |
(45) Pressure Tap for Torque Converter Outlet Relief Valve ("M") | |
- Start the engine. Warm the power train oil to a temperature of 84° ± 8°C (183° ± 14°F).
- Engage the service brakes by fully depressing either brake pedal.
Note: Full depression of either brake pedal activates a dump switch. The dump switch allows both service brakes to fully engage.
- Disengage the parking brake.
- Upshift the transmission to THIRD SPEED FORWARD.
- Operate the engine at HIGH IDLE. Make sure that the steering control lever is in the NEUTRAL position.
- Check the pressure at THIRD SPEED FORWARD STALL. The pressure at tooling (A or B) should be 415 ± 35 kPa (60 ± 5 psi).
ReferenceSee Specifications, Systems Operation/Testing and Adjusting, "Pressure Charts" in this module.
- If the pressure at tooling (A or B) is not within the specified limits, perform the following adjustment procedure.
Adjustment Procedure
- Locate torque converter outlet relief valve (18). The torque converter outlet relief valve is located on torque divider (17).
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| Illustration 4 | g01242062 |
(17) Torque Divider (18) Torque Converter Outlet Relief Valve | |
- Remove bolts and washers (9). Remove cover (10) in order to get to shim (7) .
 | |
| Illustration 5 | g01247715 |
(1) Valve body (2) Inlet passage (3) Pressure tap (4) Outlet passage (5) Spring (6) Spring (7) Shims (8) Valve spool (9) Bolt (10) Cover | |
- Add one shim (7) in order to increase the pressure setting or remove one shim (7) in order to decrease the pressure setting. One shim changes the pressure setting by 9.5 kPa (1.4 psi).
ReferenceRefer to the procedures in Disassembly and Assembly, "Torque Converter Outlet Relief Valve".
- Reassemble the torque converter outlet relief valve.
- Perform the test procedure again.
- If the pressure is within the specified limits the adjustment procedure is complete.