MTST VIII: HYDRAULICS

A. General
MHT8A001 Research vehicle service information, including vehicle service history, service precautions, fluid type, and technical service bulletins.
MHT8A002 Verify placement of equipment/component safety labels and placards; determine needed action.
MHT8A003 Identify hydraulic system components; locate filtration system components; service filters and breathers.
MHT8A004 Check fluid level and condition; purge and/or bleed system; take a hydraulic fluid sample for analysis; determine needed action.
MHT8A005 Inspect hoses and connections for leaks, proper routing, and proper protection; determine needed action.
MHT8A006 Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; interpret digital multimeter (DMM) readings.
MHT8A007 Read and interpret system diagrams and schematics.
MHT8A008 Perform system temperature, pressure, flow, and cycle time tests; determine needed action.
MHT8A009 Perform system operational tests; determine needed action.
B. Pumps
MHT8B001 Identify causes of pump failure, unusual pump noises, temperature, flow and leakage problems; determine needed action.
MHT8B002 Determine pump type, rotation, and drive system.
MHT8B003 Remove and install pump; prime and/or bleed system.
MHT8B004 Inspect pump inlet and outlet for restrictions and leaks; determine needed action.
C. Filtration/Reservoirs (Tanks)
MHT8C001 Identify type of filtration system; verify filter application and flow direction.
MHT8C002 Service filters and breathers.
MHT8C003 Identify causes of system contamination; determine needed action.
MHT8C004 Inspect, repair, and/or replace reservoir, sight glass, vents, caps, mounts, valves, screens, supply, and return lines.
D. Hoses, Fittings, and Connections
MHT8D001 Diagnose causes of component leakage, damage, and restriction; determine needed action.
MHT8D002 Inspect hoses and connections for leaks, proper routing, and proper protection; determine needed action.
MHT8D003 Assemble hoses, tubes, connectors, and fittings.
E. Control Valves
MHT8E001 Pressure test system safety relief valve; determine needed action.
MHT8E002 Perform control valve operation pressure and flow tests; determine needed action.
MHT8E003 Inspect, test, and adjust valve controls (electrical/electronic, mechanical, and pneumatic).
MHT8E004 Identify causes of control valve leakage problems (internal and external); determine needed action.
MHT8E005 Inspect pilot control valve linkages, cables, and PTO controls; adjust, repair, or replace as needed.
F. Actuators
MHT8F001 Identify actuator type (single-acting, double-acting, multi-stage, telescopic, and motor).
MHT8F002 Identify the cause of seal failure; determine needed action.
MHT8F003 Identify the cause of incorrect actuator movement and/or leakage (internal and external); determine needed action.
MHT8F004 Inspect actuator mounting, frame components, and hardware for looseness, cracks, and damage; determine needed action.
MHT8F005 Remove, repair, and/or replace actuators.
MHT8F006 Inspect actuators for dents, cracks, damage, and leakage; determine needed action.