NOTE: If the cone is badly worn or damaged, perform
the following steps.
30. For Code 7 or 19 compensators, remove the plug
(20). Using a rod, tap the seat (15) out from the
opposite end.
31. For Code 26 compensators, remove the fitting
(27) and adjusting screw (18) as an assembly.
32. Remove the dowel pin (24) and ball (17).
33. Remove the fitting (29). Using a rod, tap the seat
(15) out from the opposite end.
Rework Limits for Wear Parts
Barrel Bores
−
Measure each bore in four places,
including one place deep within the bore, where the
piston doesn’t run. Replace the barrel if the
difference in measurements exceeds .0004 in. or .010
mm.
Barrel Face
−
May be lapped no more than .0002 in.
or .005 mm measured by before and after depths of
oil grooves on barrel face.
Pistons (5)
−
Measure each piston in four places,
including one at the shoe end, where the piston
doesn’t enter the barrel. Replace Piston if the
difference in measurements exceeds .0006 in. or .015
mm.
Shoe, Piston Assembly
−
Replace assemblies if end
play exceeds .003 in. or .076 mm.
Shoe, Face
−
May be lapped up to .004 in. or .102
mm. The difference in shoe flange thickness
between the thinnest and thickest of nine shoes
should not exceed .0012 in. or. 03 mm.
Port Plate (4)
−
May be lapped .006 in. or .152 mm.
Maintain flatness of .0002 in. or .005 mm.
Wear Plate (16)
−
Do not lap. Replace if there are
any indications of wear or bending.
Guide Plate (15)
−
Do not lap. Measure thickness at
several places. Replace if thickness varies more than
.004 in. or .102 mm.
7
Form No. R92.00 Rev. 10/03
INSPECTION PROCEDURES
Part (Item No.)
Inspection Procedure
Corrective Action
Check for cracks around tapped holes.
Pump Body
Check for cracks around retainer ring groove.
Replace if cracked.
(1)
Perform dye penetrant or magnetic particle inspection over
entire housing when oil leakage is observed.
Visually inspect for obvious defects
Check for excessive wear in guide sleeve (64). Axial scratches
should not be detectable with a fingernail. Diameter difference
Cover
must not exceed .001 in. or .025 mm when measured at several
Replace if defective
(2)
random points.
Check for excessive play between drive shaft (8) and needle
bearing (65). (Maximum radial play is .003 in. or .076 mm.)
Repair by lapping until
Visually inspect the barrel face for uniform minute concentric nicks.
scratches are removed.
Do not exceed rework
limits listed above.
Visually inspect for deep, localized nicks.
Replace barrel. Flush
Barrel
reservoir and circuit.
(3)
Replace barrel.
Check for
Visually inspect for signs of seizure, scoring or discoloration.
correct hydraulic fluid
type, temperature rise,
excessive pressure.
Correct as needed.
Continued on Page 8
HPV REPAIR PROCEDURES (continued)
