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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 and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak. |
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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. |
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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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products. Dispose of all fluids according to local regulations and mandates. |
The maximum pressure in the steering system is limited to
Reference: For the correct procedure to relieve any hydraulic oil pressure that may be in the steering system, refer to the Service Manual module for Testing and Adjusting, "System Pressure - Release" for the machine that is being tested.
| Required Tools | ||
| Part Number | Description | Qty |
| 1U-5481 | Pressure Gauge Group(1) | 1 |
| 1U-5482 | Pressure Adapter Group | 1 |
| (1) | 198-4240 Digital Pressure Indicator is also available. |
- Position the machine so that the machine is in the STRAIGHT AHEAD position.
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Illustration 1 g02608717 Steering frame lock in the LOCKED position - Move steering frame lock to the LOCKED position. Engage the parking brake. Move the transmission direction selector to NEUTRAL.
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Illustration 2 g06213224 (Typical Example) Standard Location
(5) Steering pump pressureShow/hide table
Illustration 3 g06212613 (Typical Example) Remote Location (If Equipped)
(4) Pilot supply (Steering)
(5) Steering pump pressure
(6) Rear brake pressure
(7) Front brake pressure
(8) Rear brake accumulator pressure
(9) Left steering cylinder pressure
(10) Right steering cylinder pressure
(11) Brake pump pressure
(12) Front brake accumulator pressure - Install a hose from the pressure adapter group onto the Steering Pump Pressure (STR-P) (5) on the diagnostic plate. Install a
40000 kPa (5800 psi) pressure gauge onto the other end of the hose assembly. The diagnostic plate is located under the platform behind the cab (if equipped). The steering control valve is on the left inside frame under the cab.Note: Do not keep the STIC steering control lever in the LEFT TURN position or in the RIGHT TURN position for more than 10 seconds. If necessary, release the STIC steering control lever or the steering wheel (if equipped) and wait for 30 seconds before you repeat the step.
- Start the engine. Exercise the steering system to warm the hydraulic oil to normal operating temperature. Normal operating temperature can be monitored with the advisor display or with the Electronic Technician software.
- After the oil has reached normal operating temperature, run the engine at high idle.
- Move the STIC steering control lever to the LEFT TURN position or to the RIGHT TURN position. Continue to hold the STIC steering control in position until you are able to obtain a reliable pressure reading.
- Record the pressure reading on the pressure gauge. The reading should be
31000 kPa (4500 psi) . - Stop the engine. Lower the work tool to the ground.
- Remove the hose assembly and the pressure gauge from the pressure tap.
Note: If the pressure reading is not correct, the pump control valve may need adjustment. The pump control valve is on the steering pump. The steering pump is located behind the operators cab.
Adjusting the Pump Control Valve
- Pump control valve (2) is on the side of steering pump (1). The steering pump is located behind the operators cab.
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Illustration 5 g06222218 (13) Adjustment screw
(14) Locknut - Loosen locknut (44). Turn adjustment screw (13) clockwise to increase the steering system pressure. Turn the adjustment screw counterclockwise to decrease the steering system pressure. Hold the adjustment screw in place and tighten the locknut.
- Test the steering system pressure again. The reading should be
31000 kPa (4500 psi) . If the pressure is not correct, perform the adjustment procedure again.
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| Illustration 4 | g02609781 |
