DIAPHRAGM 1H9573 - Caterpillar

Test Preparation
Refer to Testing and Adjusting, "Machine Preparation for Troubleshooting".Refer to Testing and Adjusting, "System Pressure Release".
Illustration 2 g03731188
Steering Frame Lock in the LOCKED Position
Move steering frame lock to the LOCKED position.
Prepare the machine for testing by completing the procedure that is specified in the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.Test Procedure
Load sense pressure can be checked in the same way as implement discharge pressure. Checking the load sense pressure will provide an accurate reading of the pressure signal that is being sent to the implement pump. The implement discharge pressure should be equal to the load sense pressure plus the added margin pressure. Theoretically, adding the pump margin to the load sense pressure reading should yield the discharge pressure. However, machine level interactions cause inaccuracies in these readings.
Illustration 3 g03732901
Implement pump discharge pressure tap is located in the articulated hitch on the right side of the machine. Applies to EJB1-981, ; JYD1-10359, ; LSE1-10245, ; J2S1-407, ; F2T1-621, ; SA81-10281, ; EMB1-39958, ; ENE1-10412, ; XCJ1-10214, ; FTR1-1220, ; LCR1-299, ; J1S1-1569, ; HE81-10415.
(1) Implement pump discharge pressure tap.
Illustration 4 g06329794
Implement pump discharge pressure tap is located on the front frame by the grease block on the right side of the machine. Applies to EJB982-Up, ; JYD10360-Up, ; LSE10246-Up, ; J2S408-Up, ; F2T622-Up, ; SA810282-Up, ; EMB39959-Up, ; ENE10413-Up, ; XCJ10215-Up, ; FTR1221-Up, ; LCR300-Up, ; J1S1570-Up, ; HE810416-Up, ; K881-Up.
(1) Implement Pump Discharge Pressure Tap
Illustration 5 g03731194
Implement pump load sense pressure tap is located on the left inside wall of the articulated hitch on the front differential lock valve.
(2) Implement pump load sense pressure tap.
Attach a pressure gauge that can sustain pressures up to 34450 kPa (5000 psi) to the implement pump discharge pressure tap (1). If testing load sense, attach a pressure gauge that can sustain pressures up to 34450 kPa (5000 psi) to the implement pump load sense pressure tap (2). See Illustrations 3 and 5.Note: The pressure will need to be released out of the system to attach the pressure gauge.
Start the engine. The engine should be at high idle throughout the warm-up procedure. Continuously stall the TILT BACK position while simultaneously raising the lift arms at full speed. When the lift arms are almost raised, cycle the tilt cylinder to the FULL DUMP position. Then cycle to the TILT BACK position. Continuously stall the TILT BACK function and simultaneously lower the lift arms back to ground level. Without stalling the rack back function, cycle lift function to raise and lower the lift arms. This procedure will allow the pump to operate at low pressure and circulate oil through out the system. Repeat this procedure until the hydraulic oil is at 62° 8°C (143.6° 14.4°F).
Turn off the Ride Control for the machine.
Increase the engine speed to high idle.
Raise the linkage until the machine stalls out in the raised position.
Observe the pressure reading. The implement pump discharge pressure should be 29300 700 kPa (4250