COUPLING-INNER 2431510 - Caterpillar

Table 1
Required Tools
Tool Part Number Part Description Qty
A Test Gauge Hose
6V-4143 Coupler(1) 1
177-7860 Hose Assembly(1) 1
8T-4188 Union Adapter(1) 1
6V-3966 Fitting(1) 1
B Test Gauge
8T-0861 Pressure Gauge(1)(2) 1
6V-4144 Coupler(1) 1
(1) Part of 4C-4892 Hydraulic Test Fitting Gp
(2) The 198-4240 Digital Pressure Indicator is also available.
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the work tools have been lowered to the ground, and the oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
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.
Illustration 1 g01098879
View of the pressure tap for the implement pump
(1) Pressure Tap
Install test gauge hose (A) on pressure tap (1) and connect test gauge (B) to test gauge hose (A).
Connect the steering frame lock.
Start the machine.
Warm the hydraulic oil to normal operating temperature.
Lower the blade fully.
Return the lift control lever to the HOLD position.
Increase engine speed to high idle.
Move the lift control lever to the full LOWER position. Do not enter the FLOAT. Hold the control lever in this position. Note: Do not hold relief pressure for more than 30 seconds at a time.
Record the pressure reading from test gauge (B).
The main implement relief valve should be adjusted to the following pressure: 834H ... 29000 340 kPa (4200 50 psi)836H ... 24100 340 kPa (3500 50 psi)If the pressure is correct proceed to Step 16. If the pressure reading is not correct, perform the following procedure in order to adjust the main relief valve.
Illustration 2 g00726270
Location of the Main Relief Valve (836H)
(2) Locknut. (3) Adjustment screw.
Loosen locknut (2).
Turn adjustment screw (3) in order to adjust the pressure setting. Turn adjustment screw clockwise in order to increase the pressure setting. Turn the adjustment screw counterclockwise in order to decrease the pressure setting.
Tighten locknut (2).
Repeat steps 2 through 14, as needed.
Make sure that the blade is on the ground level.
Stop the engine.
Remove test gauge hose (A) and test gauge (B) from the machine.