Bulletin 2751-001-M1/USA
Service Manual
HGA Hydraguide™
Hydraulics
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee
15
Disassembly Procedure
Plug the four port holes and clean the exterior of the
unit thoroughly. Then remove the plugs.
1. To prevent possible distortion or damage to unit if
placed directly in vise, the following procedure
should be used. Insert “o” ring tube fitting, with
tube nut or fitting cap attached, into one of the four
threaded ports in the housing. Clamp the fitting in
a vise in a manner which will locate the seven end
cover bolts in an upright position. (See Figure
HGA-7).
2. Unscrew the seven special bolts (39) from the end
cover (38). Note: Special care should be used in
the following steps to insure protection of the
ground and lapped faces of the components.
Avoid scratching or nicking of finished sur-
faces.
3. Remove end cover (38) by bumping it sideways
with a soft hammer to loosen it from the rotor seal
(36) and seal retainer (35), and lift from unit.
Caution: The washer (37) and commutator (34)
may adhere to the end cover, and may be
removed with the end cover. Do not attempt to
remove pin because pin is press fit in the plate
and is non-serviceable. (See Figure HGA-8).
4. Remove the rotor seal (36) and seal retainer (35)
by bumping the can sideways with a soft hammer
to loosen it from the housing and lift off the rotor
seal and seal retainer. Discard the rotor seal.
5. If the wear washer (37) and commutator (34) were
not removed with the end cover (38), remove these
parts from the HGA unit.
6. Remove the commutator ring (33) from the mani-
fold (32), by a sliding and lifting motion. Care
should be used in the handling of this fragile
component.
7. Remove the manifold (32) from the rotor set (31)
by sliding and lifting motion.
8. Remove the rotor set (31), spacer (29) and drive
link (30) as an assembly by grasping the spacer
and removing the assembly with a sliding and
lifting motion. (See Figure HGA-9).
9. Separate drive link (30) by sliding the rotor set (31)
on the spacer (29), allowing the drive link teeth to
clear the spacer hole. Remove drive link and
separate rotor set from spacer. Use extreme
caution to keep vanes (31D) and springs (31C)
from falling out. When handling the rotor set,
pressure should be applied to the rotor (31B)
by gripping the rotor set between the fingers
and urging the rotor into contact with the
stator (31A). (See Figure HGA-10)
Carefully protect against damage to side faces.
Note: The rotor (31B) and the stator (31A) must be
kept in a matched set.
Figure HGA-7
Figure HGA-8
Figure HGA-9
