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Personal injury can result from rotating and moving parts. Stay clear of all rotating and moving parts. Never attempt adjustments while the machine is moving or the engine is running unless otherwise specified. The machine must be parked on a level surface and the engine stopped. Attach a "Do Not Operate" or similar warning tag to the start switch and controls before servicing, repairing, or making adjustments to 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. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine. |
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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
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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. |
| Required Tools | |||
|---|---|---|---|
| Tool | Part Number |
Description | Qty |
| A (1) | 198-4234 | Pressure Gauge Tool Gp | 1 |
| 198-4236 | Adapter Cable As | 2 | |
| B | 251-9600 | Pressure Sensor | 2 |
| C | 7X-2540 | Bolt | 2 |
| D | 4C-6500 | Digital Thermometer | 1 |
| ( 1 ) | The 198-4234 Pressure Gauge Tool Gp and the 198-4236 Adapter Cable As are part of the 198-4240 Digital Pressure Indicator . |
- Drive the machine to a smooth, horizontal surface.
- Move propulsion lever (1) to the NEUTRAL position.
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| Illustration 1 | g01407630 |
- Move parking brake switch (2) to the ON position.
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| Illustration 2 | g01407609 |
- Move throttle switch (3) to the LOW IDLE position.
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| Illustration 3 | g01407610 |
- Move engine start switch (4) to the OFF position.
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| Illustration 4 | g01407660 |
- Unhook latch (5) and open the engine compartment.
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| Illustration 5 | g01407663 |
- Remove locking pin (6). Raise support bar (7), and lock the bar in position with the locking pin.
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| Illustration 6 | g01407667 |
- Assemble Tool (A). Connect Tool (A) to Tool (B) .
- Connect Tool (B) to steering pump pressure tap (8) .
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| Illustration 7 | g01407668 |
View of Engine From Right Side | |
- Install steering lock pin (9) .
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| Illustration 8 | g01407670 |
- Move engine start switch (4) to the START position. Release the switch when the engine starts.
- Operate the engine at low idle for few minutes. Move throttle switch (3) to the HIGH IDLE position.
- Monitor hydraulic oil temperature with Tool (D). Operate the machine until the oil reaches a temperature of 43 ± 5.6 °C (110 ± 10 °F).
- Rotate the steering wheel. Record the hydraulic oil temperature. Read pressure on Tool (A). Use the following table in order to determine the pressure specification.
Show/hide table
Table 2 Steering Pressure Versus Hydraulic Oil Temperature Pump Outlet Pressure
± 600 kPa (± 87 psi)
22000 kPa (3190 psi)
21500 kPa (3118 psi)
21000 kPa (3046 psi)
20750 kPa (3010 psi)
20500 kPa (2973 psi)
20300 kPa (2944 psi)Temperature of Oil in Tank
°C (°F)38
(100)43
(110)49
(120)54
(130)60
(140)66
(150)
- Move throttle switch (3) to the LOW IDLE position.
- Move engine start switch (4) to the OFF position.
- If the steering pressure is outside the specified range, go to Step 18. If the steering pressure is inside the specified range, go to Step 27.
- Lift floor mat (10) and insulation (11) if the machine is equipped with a cab.
Note: If the machine is equipped with a cab, installation of the steering control unit requires two people. Do not proceed until an assistant is available.
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| Illustration 9 | g01407677 |
- Remove four bolts (12) and washers.
Note: Make sure that the rubber isolation mounts remain in place when bolts (12) and washers are removed.
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| Illustration 10 | g01407682 |
Three of four bolts are shown. | |
- Remove four bolts (13) and remove plate (14) .
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| Illustration 11 | g01407685 |
- Remove plug (15) .
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| Illustration 12 | g01407687 |
- Rotate adjustment screw (16) clockwise in order to increase pressure. Rotate the adjustment screw counterclockwise in order to decrease pressure.
Note: One rotation of adjustment screw (16) results in approximately 5000 kPa (725 psi).
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| Illustration 13 | g01407689 |
- Install plug (15) .
- Position plate (14) on the steering control unit. Install four bolts (13). Tighten the bolts to a torque of 33 ± 5 N·m (24 ± 3.7 lb ft).
- Position the steering control unit, and install Tool (C) in one of the holes at the base of the steering column. Install second Tool (C) in another hole. Align the plate and tighten Tool (C) in order to pull the steering control unit into position. After the steering control unit is splined to the steering column, install two bolts (12) and washers. Remove Tool (C) from both holes. Install two bolts (12) and washers.
Note: In Step 25, it may be necessary to slightly rotate the steering wheel. This will align the splines on the steering shaft with the splines in the steering control unit.
- Replace insulation (11) and replace floor mat (10). Go to Step 11.
- Remove steering lock pin (9). Remove Tool (B). Close the engine compartment.