Parker P1/PD Series User Manual

Parker Hannin Corporation
Hydraulic Pump and Power Systems Division
Marysville, Ohio USA
Bulletin HY28-2708-02/SVC/EN | July 2019
Medium Pressure Axial Piston Pumps
P1/PD B-mod Service Information
37
Pump Inspection Procedures
1. Carefully clean and dry all parts prior to inspection.
2. Examine piston diameters for scratches or gouges. If any piston is severely
damaged, note which piston bore it came out of. Extra attention should be
given to that bore in Step 4.
3. Check end play of piston shoe assembly. Check bottom surface of the shoes
for damage or excessive scratching. The shoe surface should be square and
at. Measure the depth of the pocket of the shoe. Shoes may be lapped as a
set if the pocket depth is within the allowable limits. Conrm pocket depth after
lapping to ensure it is still within the limits.
4. Examine the bores in the cylinder barrel (#23) for scratches or gouges. If
there are any scratches or gouges, the barrel needs to be replaced. Examine
the barrel running face for scratches or gouges.
5. Examine the port plate (#9) for scratches, gouges, pitting, material removal
or discoloration. It can be lapped lightly if the face is only lightly scratched;
otherwise, it should be replaced. Refer to the chart for lapping limits.
6. Examine the retainer plate (#26) in the area of contact with the piston shoes.
Any marks beyond light polishing indicate that replacement is necessary.
Check the surface of the spherical area of the retainer plate and the spherical
guide washer (#25). Inspect the back surface of the spherical guide washer
where the load pins (#24) make contact. If there are excessive or uneven
indentations, the spherical guide washer (#24) needs replaced.
7. Examine the top and bottom surfaces of the cam (#29). If scratches or
gouges appear to penetrate the surface treatment, then the cam (#29) should
be replaced.
8. Inspect the cam bearings (#31). They cannot be reworked and should be
replaced if worn through the Teon surface coating.
9. Both the bias piston (#12) and the control piston (#15) should move freely in
their respective guides. The pistons and bores should be free of scratches or
gouges. If not, they need to be replaced.
10. The seal area of the drive shaft (#28) should be smooth and be free of marks
from seal wear. For the larger pumps with tapered roller bearings, the bearing
surfaces should not have any indication of the bearing cone (#32) spinning
on the shaft. Keyed shafts should be inspected for signs of brinelling and
damage to the key area. If replacing the keyed shaft, then the key should be
replaced as well. Spline shafts may have a contact wear pattern, but should
not show excessive wear on the spline area.
11. Spin the shaft bearing (#32). It should not have any signs of roller
spalling, brinelling, or discoloration. It should rotate freely without binding
or rough feel.
Pump Inspection Procedures

Parker P1/PD Series Specifications

General

Brand	Parker
Model	P1/PD Series
Category	Water Pump
Language	English