9
Form No. R92.00 Rev. 10/03
INSPECTION PROCEDURES (Continued)
Part (Item No.)
Inspection Procedure
Corrective Action
Piston
Visually inspect the shoe flange for burrs or rolled edges
If slight, repair by lapping.
Assembly
If severe, replace part.
(5)
(Continued)
Inspect the piston outer diameter. Measure each piston in four
Replace Piston if the
places, including one at the shoe end, where the piston doesn’t
difference in
enter the barrel.
measurements exceeds
.0006 in. or .015 mm.
Visually inspect for slight discoloration or cross hatch trace.
Reuse as is.
Visually inspect for localized scratch marks running in
Replace pistons
a longitudinal direction.
as a set. Flush
reservoir and circuit.
Visually inspect for signs of seizure, scoring or discoloration
Replace piston and
shoe assemblies (5).
Replace barrel (3).
Check for correct
hydraulic fluid type,
temperature rise,
excessive pressure.
Correct as needed.
Shaft
Visually inspect the shaft end outer surface.
(8)
A. If burnt brown spots are apparent over entire surface
A. Remove with
emery paper.
B. If uneven wear on key side surface
B. Check fit to coupling
hub. If loose, replace.
Inspect for pitting or corrosion over all or part of shaft surface.
Replace shaft.
Check fit to coupling hub
Check alignment between
prime mover and pump.
Correct as needed.
Visually inspect shaft seal surface for:
A. Seal contact marks.
A. Use as is.
B. Bright polish
B. Use as is.
C. Contact marks over 0.04 in. or 1 mm wide, can be felt with
C. Replace shaft.
fingernail.
Inspect and replace
shaft seal as needed.
Visually inspect key groove bottom end for cracks. If in doubt,
If cracked, replace shaft.
check with dye penetrant or magnetic particle inspection.
Check alignment with
prime mover. Correct
as needed.
Inspect needle bearing rolling contact surfaces for wear.
Replace shaft if difference
between bearing contact
and non-contact surfaces
is more than .0008 in.
or .020 mm
Hanger
Visually inspect the trunnion bore.
(9)
Contact surface not excessively worn
Reuse hanger as is.
Contact surface shows obvious wear, uneven contact or
Replace the hanger
localized nicks.
when inside diameter
difference is directionally
more than .0008 in.
or .020 mm.
Visually inspect contact surface with the plunger (21).
Wear marks up to 0.2 in. or 5 mm wide.
Reuse hanger as is.
Wear marks over 0.2 in. or 5 mm wide.
Replace hanger.
Adjust volume as needed.
Trunnion
Visually inspect contact surface to hanger (9).
(10)
Very slight wear.
Reuse trunnion as is.
Localized seizure, scoring, discoloration.
Replace the trunnion.
Also replace hanger (9).
Check hydraulic fluid
type, temperature rise,
excessive pressure.
Continued on Page 10
