Bulletin 2751-001-M1/USA
Service Manual
HGA Hydraguide™
Hydraulics
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee
3
Typical Oil Flow .................................................................................................................................................... 4
Hydraguide™ Steering
Model HGA ....................................................................................................................................................... 6
System Operation ............................................................................................................................................. 7
Design and Function ......................................................................................................................................... 7
Control Valve ..................................................................................................................................................... 8
Metering Section ............................................................................................................................................... 8
Rotor Operation ................................................................................................................................................ 8
Power Steering Operation ................................................................................................................................. 9
Manual Steering Operation ............................................................................................................................... 9
Exploded View .................................................................................................................................................... 10
Service Parts List ............................................................................................................................................... 11
Service Procedure .............................................................................................................................................. 13
Work Conditions .............................................................................................................................................. 13
Seal Replacement Instructions ....................................................................................................................... 14
Servicing of HGA Unit ..................................................................................................................................... 14
Disassembly Procedure ..................................................................................................................................... 15
Inspection and Replacement .............................................................................................................................. 18
Assembly Procedure .......................................................................................................................................... 19
HGA Column ...................................................................................................................................................... 23
Oil & Hydraulic Fluid
Filling and Air Bleeding System ...................................................................................................................... 24
Hydraulic Fluid ................................................................................................................................................ 24
Tips for Maintaining the System ......................................................................................................................... 25
Offer of Sale ....................................................................................................................................................... 26
Table of Contents
