Parker P1 Series - 060, 075, 100, 140 Inspection

Parker Hannin Corporation
Hydraulic Pump and
Power Systems Division
Marysville, Ohio USA
Bulletin HY28-2665-02/SVC/EN
Medium Pressure Axial Piston Pumps
P1/PD Maintenance
48
Carefully clean and dry all parts prior to inspection.
Refer to chart 1 for dimensional information regarding allowable tolerances.
1. 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 2. Check end play of piston shoe assembly. Check
the bottom surface of the shoes for damage. The shoe surface should be
square and at. Measure the thickness of the shoe. Shoes may be lapped as
a set if the thickness is within allowable limits. Conrm shoe thickness after
lapping to insure it is still within limits.
2. Examine bores in cylinder for scratches Check diameter of bores in 4 differ-
ent locations, including near the bottom of the barrel where the piston does
not travel. If the dimensions vary by more than 0.0102 mm (0.0004 in.) or any
dimension exceeds the allowable limit, the barrel needs to be replaced. Ex-
amine the barrel face for scratches and gouges. The barrel can be reworked
if dimensions are with specications listed in chart 1.
3. The port plate can be lapped lightly if the face is only lightly scratched, other-
wise it should be replaced.
4. Examine the retainer plate 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
ball. Inspect the back surface of the spherical guide ball where the load pins
make contact. If indentations are present replace the guide ball.
5. Examine cam on top and bottom surface. If scratches or gouges appear to
penetrate the surface treatment, the cam must be replaced.
6. The cam bearings cannot be reworked and should be replaced if worn
through the Teon surface.
7. Both the bias piston and the compensator piston should move freely in
their respective bores. The pistons and bores should be free of scratches or
gouges.
8. The seal area of the drive shaft should be smooth and not have marks due to
seal wear. The bearing surfaces should not have any indication of the bearing
cone spinning on the shaft. Keyed shafts should be inspected for signs of
brinelling and damage to the key area. Splined shafts may have a contact
wear pattern but should not show excessive wear on the spline area.
060, 075, 100, 140 Pump Maintenance
PUMP INSPECTION PROCEDURE