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| Illustration 1 | g00738516 |
Hydraulic Schematic for the Torque Converter (1) Priority Valve (2) Modulating Valve for the Lockup Clutch (3) Modulating Valve for the Impeller Clutch (4) Transmission Hydraulic Controls (5) Power Train Oil Filter for the High Pressure Circuit (6) Power Train Oil Filter for the Low Pressure Circuit (7) Torque Converter (8) Lockup Clutch (9) Impeller Clutch (10) Power Train Oil Pump (11) Torque Converter Outlet Relief Valve (12) Torque Converter Bypass Orifice (13) Magnetic Screen (14) Oil Cooler (15) Reservoir in Output Transfer Gear Case (16) Outlet Line from Oil Cooler to Planetary Lubrication (A) Pressure Tap for the Main Relief Valve (B) Pressure Tap for the Priority Valve (C) Pressure Tap for Lockup Clutch (D) Torque Converter Inlet Pressure Tap P3 (E) Pressure Tap for Oil Pump (F) Pressure Tap for Impeller Clutch (G) Lubrication Pressure Tap (H) Torque Converter Outlet Pressure Tap | |
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| Illustration 2 | g00738898 |
(C) Pressure Tap for the Lockup Clutch. (F) Pressure Tap for the Impeller Clutch. (The pressure taps are located on the torque converter case on the left side of the machine.) | |
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| Illustration 3 | g00446991 |
(D) Torque Converter Inlet Pressure Tap. (The pressure tap is located on the top front of the transmission.) | |
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| Illustration 4 | g00447043 |
(H) Pressure Tap for the Torque Converter Outlet Oil. (The pressure tap is located on the torque converter case on the right side of the machine.) | |
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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. Prevent possible injury by performing the procedure that follows before working on the machine. |
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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 product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
- Move the machine to a smooth, horizontal location that is away from operating machines and away from personnel.
Note: Permit only one operator on the machine. Keep all other personnel away from the machine or in the operator's sight.
- Move the STIC transmission direction control switch to the NEUTRAL position.
- Lower the work tool to the ground.
- Engage the parking brake.
- Place blocks in front of the wheels and behind the wheels.
- Install the steering frame lock.
- Allow only authorized personnel on the machine. Keep unauthorized personnel off the machine and in clear sight of the operator.
Note: All tests and all adjustments must be made while the transmission oil is at normal operating temperature.
| NOTICE |
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Do not connect or disconnect hose fittings to or from the quick disconnect nipples when there is pressure in the system. This will prevent damage to the seals that are in the fitting. |
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| Illustration 5 | g00447603 |
(11) Torque Converter Outlet Relief Valve. (17) Spacers. | |
| Torque Converter Pressure | |||
| Pressure | Pressure Tap | Pressure at High Idle | Adjustment |
| Lockup Clutch | (C) | Stabilized pressure with an activated solenoid is 2205 ± 345 kPa (320 ± 50 psi). Pressure is less than 205 kPa (30 psi) when the solenoid is not activated. |
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| Torque Converter Inlet | (D) | Maximum pressure with cold oil is 930 kPa (135 psi). |
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| Impeller Clutch | (F) | Maximum pressure is 1965 ± 100 kPa (285 ± 15 psi). Minimum pressure is 400 ± 100 kPa (58 ± 15 psi). |
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| Torque Converter Outlet | (H) | Maximum pressure is 550 kPa (80 psi). Minimum pressure is 345 kPa (50 psi). (These pressures are for a machine in third speed, with activated brakes, with installed axle shafts, and with the torque converter in a stall condition.) |
Add spacers (17) or remove spacers (17). |
| Pressure Change for One Spacer (1) | |||
| Description | Thickness | Pressure Change | Part |
| 5M-9623 Spacer | 0.91 mm (.036 inch) |
18.2 kPa (2.64 psi) |
Output Relief Valve (11) |
| 5M-9624 Spacer | 0.25 mm (.010 inch) |
5.0 kPa (.73 psi) |
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| ( 1 ) | Before an adjustment is made to outlet relief valve (11), make sure that the valve springs are not weak or broken. |
| Required Tools | ||
| Part Number | Description | Quantity |
| 1U-5481 | Pressure Gauge Group | 1 |
| 1U-5482 | Pressure Adapter Group | 1 |
Lockup Clutch Disengaged (Minimum clutch pressure)
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The input drive shaft rotates between the torque converter and the transmission whenever the engine is running. Contact with the rotating shaft can result in personal injury or death. The rotating shaft is located under the door assemblies that are behind the machine cab. Do not allow personnel into the area behind the cab when the machine is running. |
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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before moving the machine to perform the test that follows. |
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- Install a hose and a 4130 kPa (600 psi) pressure gauge on pressure tap (C) .
- Move the lockup clutch switch to the DISABLE position.
- Engage the parking brake.
- Move the STIC transmission direction control switch to the NEUTRAL position. Start the engine.
- Increase the engine speed to high idle.
- Observe the pressure gauge. The pressure reading on the gauge must be 205 kPa (30 psi) or less.
Lockup Clutch Engaged (Maximum stabilized pressure)
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The input drive shaft rotates between the torque converter and the transmission whenever the engine is running. Contact with the rotating shaft can result in personal injury or death. The rotating shaft is located under the door assemblies that are behind the machine cab. Do not allow personnel into the area behind the cab when the machine is running. |
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Personal injury or death can result from sudden machine movement. Sudden movement of the machine can cause injury to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before moving the machine to perform the test that follows. |
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- Install a hose and a 4130 kPa (600 psi) pressure gauge on pressure tap (C) .
- Move the lockup clutch switch to the ENABLE position.
- Engage the parking brake.
- Move the STIC transmission direction control switch to the NEUTRAL position. Start the engine.
- Apply the service brakes and release the parking brake.
- Place the transmission in SECOND SPEED forward.
- Move the STIC transmission direction control switch to the FORWARD position.
- Increase the engine speed to high idle.
- Operate the machine at maximum speed and observe the pressure reading on the gauge. Make sure that the left service brake pedal or the right service brake pedal are not depressed. If the left service brake pedal or the right service brake pedal are depressed the lockup clutch will not engage. The maximum stabilized pressure must be 2205 ± 345 kPa (320 ± 50 psi).