PUMP & MTG GP-MAIN HYDRAULIC 1786641 - Caterpillar

Probable Causes
The vehicle is not filled on a surface that is level and the vent is in a downward direction.
The receiver is improperly installed with a higher spring force.
Debris is on the screen for the inlet valve or the signal line is clogged.
Kink in the signal line.
Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire.Turn the disconnect switch OFF when draining and/or removing any fuel system components.
Recommended Actions
The Vehicle Is Not Filled On A Surface That Is Level And The Vent Is In A Downward Direction
Fill the vehicle on a surface that is level with the vehicle at less than a 4° angle.The Receiver Is Improperly Installed With A Higher Spring Force
Obtain a receiver with the proper spring force.Debris Is On The Screen For The Inlet Valve Or The Signal Line Is Clogged
Clean the screen for the inlet valve. Disassemble the signal line, and clean the signal line with 0.207 MPa (30 psi) maximum compressed air.Refer to the appropriate module for your machine for the correct torque specifications.
ReferenceFor D5R2 models refer to Specifications, Systems Operation/Testing and Adjusting, UENR4119.ReferenceFor D6R2 models refer to Specifications, Systems Operation/Testing and Adjusting, UENR4109.Kink In The Signal Line
Ensure that the signal line is not kinked or bent from installation.