RING 9T1862 - 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.
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.
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 tested.
Table 1
Required Tools    
Part Number     Description    
8T-0860 (1)     Pressure Gauge    
( 1 ) The 198-4240 Digital Pressure Indicator is also available.The backup relief valve for the steering system is located on the steering control valve. The backup relief valve controls the pressure in the steering system in case the pressure control section of the steering pump fails.The backup relief valve for the steering system is set to a higher pressure than the maximum system pressure (pump stall pressure). Therefore, the backup relief valve only operates if the control section of the steering pump fails to regulate the pump pressure to 21000 350 kPa (3050 50 psi).Use the following procedure to check the pressure setting for the backup relief valve.
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.
Attach a 0 to 40000 kPa (0 to 5800 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). Pressure tap (2) is located on the panel for the remote pressure taps that is on the right side of the machine.
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.
After the oil has reached normal operating temperature, lower the bucket to the ground. Stop the engine.
Illustration