Bulletin 2751-001-M1/USA
Service Manual
HGA Hydraguide™
Hydraulics
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee
6
Hydraguide™ Steering
MODEL HGA
Hydraguide™ is the name given to hydrostatic steering systems. In the HGA type Hydraguide™ steering system,
an engine-driven pump, relief valve, cylinder, reservoir, filter, fluid lines, and an HGA control unit are needed. An
automotive type steering wheel is attached to the HGA unit and the cylinder is connected by suitable means to
the steered wheels.
The driver has power steering control at all times, so long as system components work together, system integrity
is maintained, and adequate fluid is present. If there is a failure in the high-pressure circuit, a loss of power
steering will result. The HGA, however, is designed to have some manual steering capability, depending on the
installation. If you can’t manually steer the vehicle without using extraordinary measures, such as leaving your
seat, or pushing with your legs, don’t try it. Repair the failure in the power circuit. Some vehicles may be impos-
sible to steer manually because of their weight and size.
WARNING: ALL STEERING MECHANISMS ARE LIFE AND LIMB ITEMS. AS SUCH, IT IS IMPERATIVE
THAT THE INSTRUCTIONS IN THIS BOOKLET ARE FOLLOWED TO THE LETTER. FAILURE TO OB-
SERVE THE PROCEDURES SET OUT IN THIS PAMPHLET MAY RESULT IN LOSS OF STEERING.
WARNING: EXTRAORDINARY MEASURES SHOULD NOT BE USED IN ATTEMPTING TO MANUALLY
STEER THE VEHICLE, AS THEY MAY GENERATE FORCES IN EXCESS OF 125 FT. LBS., THEREBY
DAMAGING THE UNIT INTERNALLY, WHICH COULD RESULT IN A COMPLETE LOSS OF STEERING.
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