MEC升降车平台91860-SCH-A92-6维修电气原理图手册

Section 13-TroubleshootingMay 2025General Troubleshooting TipsHydraulic Fluid PumpThe Hydraulic Drive Pump used in this model is a Variable Displacement,Axial Piston type pump.Proper adjustment is critical for normal operation of the machine.Refer to "Never use a vehicle infactory override;this state is ONLY intended for use during manufacture!While factory override isactive,the LED is rapidly flashed on/off."on page 123.The Functions/Lift pump is a fixed-displacement gear-type pump attached to the rear of the DrivePump.Common Causes of Electrical System Malfunctions:Battery switch is turned OFF (located to the left of lower controls).Battery connections are loose or corroded。Battery is not fully charged.Emergency Stop buttons are pushed (OFF position).Circuit breaker is tripped (OFF position).Common Causes of Hydraulic System Malfunctions:Hydraulic fluid level is too low.Incompatible hydraulic fluids mixed,destroying the additives and causing vamish build up,resulting in the valves sticking.Water in the hydraulic fluid due to a damp climate.Improper hydraulic fluid used.Viscosity too high in cold climates.Viscosity too low in warmclimates.Hydraulic fluid contaminated with debris-filter change interval neglected.Note:MEC uses a multiple viscosity fluid that is light enough for cold climates and resists thinningin warm climates.Use only the recommended hydraulic fluid.Substituting with a lower gradefluid will result in pump and drive motor failure.Refer to Section 5-Maintenance Lock.Note:Contamination always causes failure in any hydraulic system.It is very important to be carefulnot to introduce any contamination into hydraulic system during the assembly procedures.Please make sure all ports and cavities of the manifold and cylinders are properly covered/plugged during maintenance activities.Page 9692RT Scissor Lifts-Service Parts Manual-91860(mec)