Yale A7S1 Service Manual page 6

Table of Contents
Troubleshoot Wheel Brake...............................................................................................................................39
Hydraulic System.................................................................................................................................................. 41
Overview.............................................................................................................................................................41
Steering Control Unit.......................................................................................................................................... 42
Multi-way Valve and Priority spool ..................................................................................................................... 42
Operation of Spool Valve................................................................................................................................. 42
Neutral Position............................................................................................................................................. 42
Spool Valve (Pushed In):............................................................................................................................... 43
Spool Valve (Pulled out):............................................................................................................................... 43
Primary Relief Valve and Priority Spool........................................................................................................... 43
Inclined Auto-Lock Valve..................................................................................................................................44
Hydraulic System Main Oil Circuit ..................................................................................................................... 45
Lift Cylinder.........................................................................................................................................................47
Velocity Fuse...................................................................................................................................................... 49
Tilt Cylinder.........................................................................................................................................................50
Maintenance of Hydraulic Pump.........................................................................................................................51
Disassemble, Main Oil Pump...........................................................................................................................51
Inspection and Repair...................................................................................................................................... 51
Assemble, Main Oil Pump................................................................................................................................54
Test...................................................................................................................................................................55
Troubleshoot Hydraulic System..........................................................................................................................59
Lifting System........................................................................................................................................................60
Safety Procedures When Working Near Mast.................................................................................................... 60
Overview.............................................................................................................................................................62
Inside and Outside Masts................................................................................................................................... 62
Carriage..............................................................................................................................................................63
Adjustment of Lifting System.............................................................................................................................. 63
Electrical System...................................................................................................................................................64
Overview.............................................................................................................................................................64
Power supply system....................................................................................................................................... 64
Starting system................................................................................................................................................ 64
Ignition system (ICE forklift truck).................................................................................................................... 64
Preheating system (diesel forklift truck)........................................................................................................... 64
Dash Instrument Display System.....................................................................................................................65
Lighting, sound and alarm system................................................................................................................... 65
Electrical Box......................................................................................................................................................65
Battery................................................................................................................................................................ 65
Description and Summary of Basic Truck Operations........................................................................................ 65
Introduction to the Power Distribution Module (PDM)........................................................................................ 67
Electrical Schematics..........................................................................................................................................67
Troubleshoot Electrical System.......................................................................................................................... 81
Troubleshooting............................................................................................................................................... 81
Drive, Operation, and Routine Maintenance of Forklift Truck............................................................................... 82
Cooling System Troubleshooting and Service....................................................................................................82
Coolant level check..........................................................................................................................................82
Flushing the cooling system.............................................................................................................................82
Adding antifreeze/coolant.................................................................................................................................82
Cleaning the radiator........................................................................................................................................82
Oils Used for Forklift Truck................................................................................................................................. 83
Hydraulic Oil Gauge and Hydraulic Oil fill...........................................................................................................83
General inspection requirements..................................................................................................................... 83
Fill Level Requirements....................................................................................................................................83
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TABLE OF CONTENTS (Continued)