| Required Tools | ||
|---|---|---|
| Part Number | Description | Qty |
| 177-7861 | Hose As | 1 |
| 6V-4143 | Coupler | 2 |
| 8T-0859 | Pressure Gauge | 1 |
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Personal injury or death can result from machine articulation or movement. Machine frames can move and a person can be crushed. Connect the steering frame lock link between the front and rear frames before working on machine. Do not disconnect the lock link until the machine is made operational and the commissioning procedure is completed. |
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Personal injury or death can result from escaping fluid under pressure. Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue, causing serious injury, and possible death. Always use a board or cardboard when checking for a leak. Do not check for pin hole leaks in pump or motor hoses during a steer stall condition. If fluid is injected into your skin, it must be treated by a doctor familiar with this type of injury immediately. |
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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. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
- Install steering frame lock (1) so that the machine cannot turn.
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| Illustration 1 | g00935388 |
Steering frame lock installed (1) Steering frame lock | |
- Remove the protective cover from pressure tap (3). Connect a hose assembly with an 8T-0859 Pressure Gauge to pressure tap (3) .
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| Illustration 2 | g00935390 |
Steering control valve (2) Pressure adjusting screw (3) Pressure tap | |
- Start the engine. Operate the engine at the high idle rpm with the transmission in Neutral.
- Turn the machine against the steering frame lock will cause the relief valve to open.
- Observe the pressure gauge. The pressure reading on the gauge should be 17000 ± 520 kPa (2500 ± 75 psi). Check the reading on the gauge while attempting to turn the machine in both directions.
- If the pressure is not the same in both directions, there is a problem in the shuttle valve of the steering control valve. If pressure is the same in both directions, but pressure is not correct, adjust the spring tension of the relief valve in the steering control valve group. To adjust the relief valve, perform the following procedure:
- a. Loosen locknut (4) .
- b. Turn adjusting screw (2) clockwise to increase the pressure setting and counterclockwise to decrease the pressure setting. Tighten the locknut.
- a. Loosen locknut (4) .
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| Illustration 3 | g03687502 |
Steering control valve (2) Pressure adjusting screw (4) Locknut | |
- After the correct pressure setting is obtained, stop the engine. Remove the pressure gauge from the pressure tap. Place the protective cover on the pressure tap.
- Remove the steering frame lock.