Inspection And Repair, Hydraluic Pump - Table - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE VI-III. INSPECTION AND REPAIR, HYDRAULIC PUMP
ITEM INSPECTION
REPAIR
Rear Side
Visually inspect the lapped
face for scratches or signs
of scoring.
Centerplate
Drive Side
Secondary
Shaft
Visually inspect the two lap-
ped faces for scratches or
scoring. Inspect the gear
pockets for deep scratches.
Visually inspect the lapped
surface for scratches or
signs of scoring.
Inspect the shaft for deep
scratches in the bearing area.
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,
replace secondary shaft.
Gears
I
Visually inspect gears for evi-
dence of chipped teeth or
cracks around the bore. Mea-
sure the gear O.D., which
should be 0.8562"/0.8560."
Visually inspect the bearing
bores for scratches and/or
scoring.
If gears are not within tolerance
or if there are any cracked
teeth, replace the pump.
If badly scored, replace pump.
Bearings
NOTE
The PA-31-350 Parts Catalog should be used to obtain repair
kits to service this pump.
Revised: 3/31/94
HYDRAULIC SYSTEM
2D7