Bulletin 2751-001-M1/USA
Service Manual
HGA Hydraguide™
Hydraulics
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee
17
Disassembly Procedure
20. Remove the drive ring (18) by placing the end of
the spool (22) on a table surface. Rotate the input
shaft (16) to extremes of travel until the drive ring
falls free. (See Figure HGA-14).
Figure HGA-14
21. With the spool assembly in the same position as
the step above, rotate the input shaft (16) in a
clockwise direction until the actuator ball (23)
disengages from the helical groove in the input
shaft. Lift out input shaft. Caution: The actuator
ball may fall free and care should be used to
not lose it.
22. Do not remove the ball retainer spring (24)
unless replacement is required. If necessary to
remove this spring, discard the retainer (24) if
moved.
A screwdriver may be used to assist in the prying
of the spring over the shoulder of the spool (22).
Care must be used to avoid scratching or nicking
of the spool outside diameter and control edges.
(The following procedure is optional).
23. Return to the housing (25) which is mounted in the
vise. Remove the plug and roll pin assembly (28).
A steel ball is captivated by the plug and roll pin
assembly. Care must be used to avoid the loss of
the ball. Remove ball by shaking after housing is
removed from the vise. Discard “O” ring (27).
This completes the disassembly of the HGA unit.
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