ANGLE A. 1K0790 - Caterpillar

Table 1
Required Tools    
Part Number    Part Description    Qty    
8T-0859     Pressure Gauge     1    
6V-3989     Unvalved Nipple     1    
6V-4143     Coupler Assembly     2    
6V-3014     Hose     1    
Prior to any adjustment, refer to the "Preparations" section in Testing and Adjusting, "Operational Checks".
Start the engine.
Place the engine speed dial in position 10.Test and Adjust for the Line Relief Valves
Illustration 1 g00979898
(1) Medium pressure attachment line relief valves (2) Medium pressure attachment relief valve (M3) Pressure tap, which is located on the end of manifold
Connect a 25000 kPa (3600 psi) pressure gauge to pressure tap (M3) .
To check the setting of the two line relief valves for the medium pressure at pressure tap (M3), increase the pressure setting of relief valve (2). Remove the plug from relief valve (2) and turn the adjusting screw clockwise in order to increase the pressure setting.
Stall the medium pressure attachment. Check the pressure at pressure tap (M3). When the pressure stops increasing, read the pressure on the gauge. Refer to Testing and Adjusting, "Specifications" in this manual for the correct line relief pressure.
Check the line relief valves in both directions (left and right).
To adjust the pressure on the line relief valves, remove the cover and loosen the locknut on line relief valve (1). Turn the adjustment screw clockwise in order to increase the pressure setting. Turn the adjustment screw counterclockwise in order to decrease the pressure setting.Note: Always make the final pressure adjustment on the pressure rise.
When the adjustments are complete, tighten the locknut for the adjustment screw to the proper torque and place the cover on the adjusting screw.
Once the line relief valves are adjusted to the recommended setting, use the following procedure to adjust relief valve (2) .Test and Adjust for the Relief Valve
Illustration 2 g00979898
(1) Medium pressure attachment line relief valves (2) Medium pressure attachment relief valve (M3) Pressure tap, which is located on the end of the manifold
Operate the medium pressure attachment against the end position of the cylinders. Check the pressure at pressure tap (M3). Refer to Testing and Adjusting, "Specifications" in this manual for the correct pressure setting.
To adjust the pressure setting of the relief valve, remove the plug from relief valve (2) and loosen the locknut.
While the attachment is stalled, turn the adjustment screw until the pressure at pressure tap (M3) is set to the correct pressure. Turn the adjustment screw clockwise in order to increase the pressure. Turn the adjustment screw counterclockwise in order to decrease the pressure.Note: Set the pressure to a pressure that is less than the pressure that is recommended by the manufacturer of the tool by 1000 kPa (145 psi).Note: Always make the final pressure adjustment on the pressure rise.
When the adjustments are complete, tighten the locknut for the adjusting screw to the proper torque.