Parker 700 Series - Section I Motor Disassembly; Seal Removal; Pilot Option; Parts Inspection

Bulletin 1531-001/USA
Pump/Motor Division
700 Series Service Procedure
Parker Hannin Corporation
Hydraulic Pump/Motor Division
Greeneville, TN 37745 USA
15
Section I
Motor Disassembly
1. Mount the motor in a soft-jawed vise, shaft up,
clamping rmly on the cover assembly. Remove
manifold port rings if applicable.
2. Remove the key or castle nut if on the shaft.
3. Remove the 4 socket head cap screws (10) from
the ange cover. Lift ange cover (12) by lightly
tapping the ange up off the dowels with a soft
hammer. Do not remove the dowel pins.
4. Remove thrust washers and shaft. (2 washers
used with the 1.25" dia. shaft 1 washer used with
the 1" dia. shaft).
5. Loosen and remove the 8 socket screws (15) to
remove the front bearing housing (16) and the
locating ring. Remove rollers and check balls.
Note: The check balls may fall into the
bolt holes or into the commutator ports. Be sure
that both check balls are removed and accounted
for.
6. Separate the locating ring from the front bearing
housing (16) by holding the locating ring in
hand and tapping the housing with a soft nosed
hammer.
7. Remove the outer carefully to prevent rolls from
falling or remove rolls with a magnet.
8. Remove rolls, inner and valve plate.
9. Remove commutator plate assembly (7) and seal
(6).
10. Turn motor assembly upside down and clamp
center block (9) in vise.
11. Loosen and remove the 8 5/16-24 bolts (1).
Remove the cover (2), locating ring, check valve
balls (quantity 2)(8), and rollers.
12. Remove the outer, rolls, inner and valve plate.
13. Lift shaft (6) up a short distance, push the valve
plate down and remove the 2 snap ring pieces (5).
NOTE: With the snap ring removed, the shaft will
fall out of the motor unless you maintain a grip on
it.
14. Remove the valve plate, shaft (6) commutator
plate (7) and seal (3).
Seal Removal
15. Remove dust seal by tapping on the seal with a
blunt instrument and hammer with the ange (12)
lying on a clean, at surface.
16. Pry lip seal out with a screwdriver. Be careful to
not scratch the ange seal area. Scratching the
seal area would possibly create a leak path.
Pilot Option
To change pilot operation from normally parallel to
normally series or vice versa, reverse the spool
direction. Also valid for solenoid shift motors.
1. Remove the plugs (18) on the center block.
2. Remove the spool (20) and spring (19).
3. Looking at the port surface, install the spool with:
A) the "double" or "wide" land nearest the pilot
port for normally parallel operation.
B) the "double" or "wide" land opposite the pilot
port for normally series operation.
4. The spring is always located on the side opposite
the pilot port.
THE DISASSEMBLY OF THE MOTOR IS NOW
COMPLETE.
Parts Inspection
Inspect the shaft for a smooth polish in the bearing and
seal areas. If scratched, polish with ne emery
paper in circumferential direction. If pitted, or
if scratches are deep, replace shaft and check
the rest of the motor for scratches, galling or
contamination damage. Replace parts as needed.
If your motor has a thru shaft option and the seals are
leaking, the entire cover must be replaced. Thru
covers contain no serviceable parts.
The rollers & check balls will fall
out so be ready to catch them to
prevent damage and loss.
CAUTION
If placed in a vise, use minimal
clamping force to prevent a
permanent out of round condition.
CAUTION
The rollers will fall out so be ready
to catch them to prevent damage
and loss.
CAUTION