14
THE OILGEAR COMPANY
Bulletin 947023
VALVE PLATE GROUP
Inspect the valve plate
(401)
surface which mates
with the cylinder barrel
(101)
for excessive wear.
Remove minor defects by lightly stoning the
surface with a hard stone which is flat to within
0.001 inches (0,03 mm).
Be sure to stone lightly. Any excessive
stoning will remove the hardened surface.
If wear or damage is extensive, replace the
valve plate.
ROTATING GROUP
Inspect cylinder barrel
(101)
piston bores and the
face which mate with the valve plate for wear.
Remove minor defects on the face by lightly
stoning or lapping the surface.
Inspect the cylinder bearing
(202)
for damage and
replace if necessary. Check all piston and shoe
assemblies
(102)
to be sure they ride properly on
the swashblock.
Be sure to stone lightly. Any excessive
stoning will remove the hardened surface.
If wear or damage is extensive and defects
cannot be removed, replace the cylinder
barrel.
See
Figure 7
. Check each shoe face for nicks and
scratches, and the shoe for smooth pivot action on
the piston.
If one or more piston/shoe assembly needs
to be replaced, replace all the piston/shoe
assemblies. When installing new piston/
shoe assemblies or the rotating group,
make sure the pistons move freely in their
respective bores.
Figure 7. Piston and Shoe Inspection (5V-12015-L)
(A)
All shoes must be equal within 0.001 inches
(0,025 mm) at this dimension.
(B)
All shoe faces must be free of nicks.
End play should not exceed 0.003 inches
(0,076 mm) when new or 0.006 inches
(0,152 mm) when worn.
SWASHBLOCK GROUP
Inspect the swashblock
(201)
for wear. If defects
are minor, stone the swashblock lightly. If damage
is extensive, replace the swashblock.
Check the small hole in the face of the
swashblock. The hole provides “porting” for the
hydrostatic balance fluid of the piston/shoe
assembly to be channeled through the swashblock
to the face of the saddle bearing, providing
pressure lubrication.
Compare the saddle bearing
(204)
thickness in a
worn area to thickness in an unworn area. Replace
saddle bearings if the difference is greater than
0.015 inches (0,4 mm).
Check the mating surface of swashblock for cracks
or excessive wear. The swashblock movement in
the saddle bearings must be smooth. Replace if
necessary.
Be sure to stone lightly. Any excessive
stoning will remove the hardened surface.
If wear or damage is extensive and defects
cannot be removed, replace if necessary
or if you suspect them of being bad.
NOTE
NOTE
NOTE
B
A
OILG-0005
NOTE
NOTE
