Bulletin 2751-001-M1/USA
Service Manual
HGA Hydraguide™
Hydraulics
Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee
22
Assembly Procedure
24. Apply a small amount of clean grease to washer
(37) and install over pin in end cover assembly
(38). Grease should hold washer (37) to end cover
assembly.
25. Assemble end cover assembly (38) with washer
(37) attached over assembly posts and onto HGA
unit.
26. Install five of the special bolts (39) finger tight.
Remove two assembly posts and assemble the
other two special bolts per steps 1 and 2 as
follows, and do not over torque as it will cause
unrepairable damage:
1. Torque all seven special bolts to 2-3 ft. lbs in
sequence as shown in Figure HGA-28.
Figure HGA-26
Figure HGA-27
2. Torque all seven special bolts to 15-19 ft. lbs. in
sequence as shown in Figure HGA-28.
Note: Rotate input shaft during step 2 to
prevent binding.
27.Relocate HGA unit in a vise with the input shaft up.
Cover end of input shaft with cellophane tape, to
protect new seal (5) when it is assembled over
sharp edges of input shaft.
28.Lubricate and install new seal (5) with lip side first
onto input shaft.
29.Assemble new washer (4), with small end first,
onto input shaft and push new washer and new
seal down into upper cover (7). (A short piece of
metal tubing, 15/16” minimum I.D. x 1-3/16”
maximum O.D. or a 7/8” deep well socket may be
used to push these parts into place.)
30.Assemble retaining ring (3) into upper cover (7)
groove. Be sure rounded edge of retaining ring is
faced inward.
31.Assemble new dirt seal (2) into upper cover (7)
counterbore.
32.Note: If the HGA unit is to be stored, plug the
cylinder ports and fill the inlet port with clean oil.
Rotate input shaft until oil appears at outlet port.
33.Plug the port holes to prevent entrance of dirt. This
completes assembly of the HGA unit.
Figure HGA-28
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