ROD A.4B2718 7B4613 - Caterpillar

Illustration 5 g01681886
View of pressure port (A) (A) Pressure tap for the steering system
Put the transmission selector lever into the PARK position in order to apply the parking brakes.
Operate the engine at HI IDLE. Turn the steering wheel to the right or turn the steering wheel to the left until the steering cylinder stop is reached. Then continue turning the steering wheel against the stop. Hold the steering wheel in this position for three seconds and then release the steering wheel. Continue this step until the oil in the steering system reaches at least 38 °C (100 °F).
Stop the engine.Note: Backup relief valve (4) for the secondary steering has a higher pressure setting than the main relief valve for the secondary steering.
Do not increase the pressure setting of the relief valve too much. If the pressure setting of the relief valve is set too high, damage to the components of the system could occur.
Remove plug (2) from electric drive pump (1) for the secondary steering and the brake release. Use the setscrew that is located behind plug (2) in order to increase the pressure setting of the main relief valve for the secondary steering. Turn the setscrew clockwise. Approximately 3 turns of the setscrew will increase the pressure setting of the main relief valve for the secondary steering above the pressure setting of the backup relief valve for the secondary steering. Count the number of turns so that you can return the setscrew to the original setting.
Install a 198-4240 Digital Pressure Indicator with the 198-4238 Pressure Sensor at the pressure tap (A) for the steering system. Pressure tap (A) is located close to the steering check and relief valve (3) .
Check the pressure on the pressure gauge. The pressure setting of the backup relief valve for the secondary steering is 20700 400 kPa (3002 58 psi).
Illustration 6 g01322790
(4) Backup relief valve for the secondary steering (10) Locknut (11) Setscrew
If the pressure needs to be adjusted, loosen locknut (10) . Use setscrew (11) to change the pressure setting.
With an allen wrench, rotate the setscrew clockwise by 1/4 turn in order to raise the pressure. Rotate the setscrew counterclockwise by a 1/4 turn in order to lower the pressure. Each 1/4 turn of the setscrew changes the pressure approximately 1183 kPa (172 psi).
Repeat Steps 7 through 8 until the pressure setting is correct.
When the pressure setting of backup relief valve (4) for the secondary steering is correct, adjust the pressure setting of the main relief valve for the secondary steering to the original pressure setting.
Install plug (2) . Remove the gauge from pressure tap (A) .Relief Valve (Secondary Steering Main) Test and Adjust
Table 2
Tools Needed     Qty    
198-4240 Digital Pressure Indicator     1    
198-4238 Pressure Sensor     1    
Personal injury or death can occur if personnel are trapped between the wheel and the frame.The steering system is hydraulically controlled and wheels can crush personnel during movement.Use caution when working between the wheels and the frame. If