COUPLING GP 5026656 - Caterpillar

Table 1
Required Tools    
Part Number     Description     Quantity    
198-4240     Digital Pressure Indicator     1    
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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Prepare the machine for troubleshooting.Reference: Refer to Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.Note: Ensure that you install the steering frame lock.
Illustration 1 g00865379
Location of Implement Pump (1) Implement pump. (2) Pressure tap (load signal pressure).
Connect the 198-4240 Digital Pressure Indicator to pressure tap (2) .
Warm the hydraulic oil to normal operating temperature. Normal operating temperature is 45 °C (115 °F) to 70 °C (160 °F). Use the following procedure in order to warm the hydraulic oil.
Operate the engine at 1800 RPM to 2000 RPM.
Extend the lift arms until the cylinders bottom out.
Operate the tilt cylinders back and forth until you reach the normal operating temperature.
Lower the felling head to the ground.
Increase the engine speed to 2350 50 RPM.
Illustration 2 g00775845
Left Implement Joystick (A) Steering (LEFT). (B) Steering (RIGHT).
Slowly move the left joystick to the LEFT TURN position or the RIGHT TURN position. The steering frame lock will prevent the machine from turning. The pressure that is indicated on the pressure gauge should be 22500 400 kPa (3260 60 psi) for the LEFT TURN position and the RIGHT TURN position.
Illustration 3 g00865449
(3) Signal limiter valve.
If the pressure setting is not correct, release the left implement joystick. Adjust signal limiter valve (3) by loosening the locknut for the adjustment screw.
Turn the adjustment screw with an hex wrench. Tighten the locknut. Perform Step 6 again in order to check the new pressure setting.
Stop the engine. Remove the test equipment.