PLUG AS 1626448 - 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 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-0856 (1)     Pressure Gauge    
( 1 ) The 198-4240 Digital Pressure Indicator is also available.
Illustration 1 g00460133
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.
Position the machine so that the machine is pointing straight ahead.
Bumping or turning the steering wheel could cause excessive oil pressure in the hydraulic oil line that connects to the pressure gauge. The excessive oil pressure could cause damage to the pressure gauge.Do not bump or turn the steering wheel during the following steps.
Attach a 0 to 6000 kPa (0 to 870 psi) pressure gauge to a section of hydraulic line.
Illustration 2 g01099999
Location of the remote pressure taps
Illustration 3 g01193841
(2) Pressure tap for the steering pump
Attach the hydraulic line to pressure tap (2) .
Start the engine. Operate the engine at high idle. Move the tilt control lever to the TILT BACK position.
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.
Record the pressure reading on the pressure gauge. The reading should not exceed 3600 kPa (525 psi).
Adjust the flow compensator valve if the pressure is not correct.Note: Do not make adjustments to the steering pump based on the results of this test. If the pressure reading is not correct, you should test the margin pressure. See the following reference for the correct procedure to test the margin pressure.
Lower the bucket and any attachment to the ground. Stop the engine.
Remove the hydraulic lines and the pressure gauge from the pressure tap.Reference: For additional information on testing the margin pressure, refer to the Service Manual module for Testing and Adjusting, "Piston Pump (Steering) Margin Pressure - Test and Adjust" for the machine that is being serviced.Adjusting the Flow Compensator Valve
Illustration 4 g00460444
Pressure and Flow Compensator Valve