DRIVE GP-FINAL 1807918 - Caterpillar

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 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, "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.
Machine Preparation
Note: The steering frame lock must be installed to complete the line relief valves test.Note: Start the engine. Run the engine at high idle. Increase the temperature of the hydraulic oil to normal operating temperature.
Illustration 13 g00986812
(1) Steering relief valve (2) Line relief valve for the rod end of the steering cylinder (3) Steering control valve (4) Line relief valve for the head end of the steering cylinder
Table 4
Pressure Setting for Steering Relief Valve (1)    
17250 550 kPa (2500 80 psi)    
Table 5
Pressure Setting for Line Relief Valves (2)    
Cylinder     Head End     Rod End    
Steering    
19310 172 kPa (2800 25 psi)    
19310 172 kPa (2800 25 psi)    Note: To set a line relief valve (2), the steering relief valve (1) setting must be higher than the setting for line relief valve (2). Refer to Table 4 for the steering relief valve (1) setting. Refer to Table 5 for the line relief valve (2) settings.ReferenceFor additional information on setting steering relief valve (1), refer to Steering System Pressure - Test and Adjust in this publication.Note: Do not move the STIC steering control for more than 5 seconds while the pressure is at the line relief valve setting. Rapid heating of the hydraulic oil may occur.Testing the Line Relief Valves
Release the pressure from the steering system. Refer to Systems Operation Testing and Adjusting, RENR4606, "R1300 LHD", "Steering System".
Illustration 14 g00986813
(5) Pressure tap for the steering system
Connect the 8T-0859 Pressure Gauge to pressure tap (5) .Note: Steering relief valve (1) has a lower setting than steering cylinder head end line relief valve (3) and the rod end line relief valve. Temporarily increase the steering relief valve (1) setting to set line relief valve (4) .ReferenceFor additional information on setting steering relief valve (1), refer to ""Steering System Pressure - Test and Adjust"" in this publication.
Start the engine. Raise the lift arms so that the bucket is clear of the ground.
Increase the engine to high idle rpm. Hold the STIC steering control in the full RIGHT TURN position to test the rod end line relief valve.
Record the pressure reading from the pressure