SEAL-O-RING 4872960 - 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 immediately by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
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, "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.
Specifications
Table 1
906K, 907K, and 908K Steering Pump Pressure    
Function     Setting     Actual    
Pump pressure max    
20500 kPa (2973 psi)        Introduction
Before any tests are performed, visually inspect the complete hydraulic system for oil leaks and damaged parts. Refer to Testing and Adjusting, "Visual Inspection".Required Tools
Illustration 1 g02571852
Tooling (A) 198-4240 Digital Pressure Indicator Gp
Table 2
Required Tools    
Tool    Item    Qty    Part No    Description    
A         198-4240     Digital Pressure Indicator Gp    
    A1     1     198-4234     Digital Indicator    
A2 1     198-4239     Pressure Sensor Gp
(0 to 41,368 kPa (0 to 6,000 psi))    
A3 1     198-4236     Adapter Cable As    Test Preparation
Refer to Testing and Adjusting, "System Pressure Release"
Move the machine to a smooth, horizontal location. Move the machine away from other operating machines and away from personnel.
Lower the work tool to the ground. Stop the engine.
Engage the parking brake.
Place chocks in front of the wheels and behind the wheels.Test Procedure
Position the machine so that the machine is in the STRAIGHT AHEAD Position.
Illustration 2 g03803092
Install the steering lock into the frame at the articulation point on the left side of the machine.
Illustration 3 g03803143
Rear of machine (1) Steering pressure test port
Open engine compartment hood on the rear of the machine to gain access to the steering pump test port.
Install tooling (A) to the steering pump test port (1) which is the second gear pump in the stack.
Start the engine. Operate the engine at high idle. Stall the steering by continuously turning the steering wheel to the right or the left. Record the pressure indicated by tooling (A) while the steering is stalled. The steering system pressure should be 20500 kPa (2973 psi).
Turn the engine start switch key to the OFF position.
Remove the test equipment.