Piper Navajo PA-31 Service Manual page 374

PIPER NAVAJO SERVICE MANUAL
TABLE VI-III. INSPECTION AND REPAIR, HYDRAULIC PUMP
ITEM
(Refer to figure 6-34.)
INSPECTION
REPAIR
Rear Side (13)
Centerplate (10)
Drive Side (7)
Visually inspect
the lapped face
for scratches or
or signs of scoring.
Visually inspect
the two lapped
faces for scratches
or scoring. In-
spect the gear
pockets for deep
scratches.
Visually inspect
the lapped surface
for scratches or
signs of scoring
Lap the surface
to remove any
scratches.
Lightly stone any
burrs around the
gear pockets. Lap
the faces, but do
not remove more
than 0.0001" total
of metal from both
sides.
Lap the surface to
remove any scratches.
If deep scratches
are present replace
part.
If deep scratches
are present, re-
place secondary
shaft.
Secondary
Shaft ( 17)
Inspect the shaft
for deep scratches
in the bearing
area.
Gears ( 18) and ( 19)
Visually inspect
gears for evidence
of chipped teeth
or cracks around
the bore. Measure
the gear O.D.,
which should be
0.8562"/().8560"
If gears are not
within tolerance
or if there are
any cracked teeth,
replace the pump.
If badly scored,
replace pump.
I
Bearings
Visually inspect
the bearing bores
for scratches
and/or scoring.
NOTE
Catalog should be used to obtain repair kits to The PA-31 Parts
sernce this pump.
Revised: 2/18/94
HYDRAULIC SYSTEM
2D20