COVER 4645182 - Caterpillar

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.
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 Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Note: Use this procedure to determine whether the steering pressure is regulated correctly by the control section of the steering pump.Note: The machine that is shown in the illustrations for this procedure has HMU steering. The test may also be used on machines that have the command control steering.Note: Use the information in the reference to prepare the machine for this test. Also, use the information in the reference to relieve any hydraulic pressure that may be in the steering system.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, "Machine Preparation for Troubleshooting" for the machine that is being serviced.
Table 1
Required Tools    
Part Number     Description    
8T-0860 (1)     Pressure Gauge    
( 1 ) The 198-4240 Digital Pressure Indicator is also available.
Illustration 1 g00294202
Steering Frame Lock in the LOCKED Position (1) Steering frame lock.
Move steering frame lock (1) to the LOCKED position.
Engage the parking brake. Move the transmission direction selector to the NEUTRAL position.
Attach a 0 to 40000 kPa (0 to 5800 psi) pressure gauge to a section of hydraulic line.
Illustration 2 g00317643
Typical examplePressure Tap for the Steering Pump (2) Pressure tap.
Attach the hydraulic line to pressure tap (2). Pressure tap (2) is located on the right side of the machine and above the hydraulic oil tank.Note: During the following step, do not keep the tilt control lever in the TILT BACK for more than ten seconds. Release the control lever and wait for two to three seconds before you repeat the step.
Start the engine. Operate the engine at high idle. Move the tilt control lever to the TILT BACK position in order to increase the oil to normal operating temperature. The oil is at normal operating temperature when the hydraulic oil temperature gauge is between the first mark and the second mark.
After the oil has reached normal operating temperature, lower the bucket until the bucket is slightly off the ground. Run the engine at high idle.Note: During the following step, do not keep the steering pump at stall condition for more than ten seconds. If necessary, release the steering wheel and wait for 30 seconds before you repeat the step.
Turn the steering wheel against steering frame lock (1). Continue to turn the steering wheel against the steering frame lock in order