Inspection Of Parts; Pump And Motor Shafts; Cylinder Block Assemblies--General; Cylinder Block Face - Kohler K91 Owner's Manual

INSPECTION OF PARTS
All parts should
be
thoroughly cleaned and exam-
ined. After examining, cover all parts with a lint-free
cloth while waiting for assembly. Oil all moving parts
with 10W30 premium engine oil when assembling.
FIG.
42.
Check Free Movement of Pistons
FIG.
40.
Pump and Motor Shafts
Examine the bearing and seal surfaces of the shafts.
Scored or worn shafts must
be
replaced. Pay particular
attention to the pump shaft seal area. A scratched
seal area will cause an oil leak.
Cylinder
Block
Assemblies General
Although the pump and motor cylinder block and
piston assemblies look similar, they differ. Two cylin-
der
block kits, one for the pump and one for the
motor, are available, and should
be
used for replace-
ment when the following conditions are found:
FIG.
41.
1.
Cylinder bores out of round or scored.
2.
Cylinder block face (valving surface) worn,
3.
Scored piston barrels.
4.
Slipper edges rounded more than
1/32
inch.
When inspecting cylinder block assemblies always
scratched or scored.
return pistons to their original cylinder bores.
Check
to make sure the pistons move freely in their
bores. Carefully remove each piston and
check for
scores on the piston barrels and on the ,cylinder bore
walls. Replace with cylinder
block
kit
if
bores or
barrels are scored.
Cylinder
Block
Face
Inspect the polished valving surface of
the
cylinder
blocks.
If
the surface i s scored replace with a cylinder
block kit.
Pistons and Slippers
Scored piston barrels and slippers with edges
rounded more than
1/32
inch must not
be
used. Replace
with a new cylinder block
kit.
Slight scratches on slip-
pers or slightly rounded edges may be removed by
lapping. Use crocus cloth for finishing. Do not remove
more than
.005".
Make sure that all slippers are with-
in .002" thickness of each other.
Make sure the lubrication hole
is
open in the center
of the slipper face. Use compressed air to open.
FIG.
43.