PIPER SENECA II SERVICE MANUAL
6-7. CLEANING.
INSPECTION AND REPAIRS
OF HYDRAULIC PUMP.
NOTE
Repair facilities
must be clean
to prevent
contamination
of pump
components.
Proper
and careful
handling
should be exercised
to
prevent
damaging
pump components.
a.
Discard
all O-rings.
b. Remove
caps or plugs
and clean all components
with a dry
type cleaning solvent
and dry
thoroughly.
c. Inspect
pump components
for scatches,
scores,
chips, cracks
and wear.
d.
Inspect motor for worn brushes (minimum
of .218 of an inch brush remains between
the braided
and commutator
end),
excess
commutator
wear and
excess
bearing wear.
e. Repairs
are
limited to
O-ring and
brush
replacement
as follows:
1. One brush
holder has
the winding
wire attached.
Locate this
wire and remove
by using
a
soldering
gun.
2. The
head assembly
can now
be removed and
worked on
for ease of brush
replacement
if re-
quired.
3.
Remove
brush
wire and
brush from
bimetal
heat
protector.
4. Solder
new brush wires
to head assembly
and bimetal heat protector.
and wire from
winding
to one brush holder.
5. Install
brush springs
and brushes
into brush
holders and
secure in place
(temporary)
with a
piece
of string looped
around the
brush and holder
and tied
in a knot.
NOTE
Insure that
the braided
wire is in the
holder slot for
proper brush
movement.
6. Install the head
assembly with new brushes to the frame
and commutator in accordance with
instructions
given in
Paragraph 6-8, Step
a.
6-8. ASSEMBLY OF
HYDRAULIC PUMP. (Refer
to Figure 6-3.)
a. The
pump motor
may be assembled
and installed on
the reservoir as
follows:
1. Position motor
frame (9) on reservoir
(13). Note aligning
marks on frame
and reservoir.
2. Place
thrust washers ( II),
of the same amount
removed, on the drive
end of the armature
(8).
3.
Lubricate the entire
length of the armature
shaft, on the drive
end, with light grease
to protect
O-ring seal from
damage. Insert end of shaft
in reservoir.
4. Saturate felt oiling
pad around commutator
end bearing
with SAE 20 oil. Allow
excess oil to
drain off
before assembling
motor.
5. Insert thrust ball (7) in
bearing of motor head (1). To hold ball
in position, place a small
amount of
grease inside the
bearing.
6. Place head assembly on frame
and allow brushes to extend over commutator.
Remove the
string securing the brushes
in the holders. Push head assembly on frame
and insure proper indexing of head
and
frame assemblies. Secure
in place with thru bolts
(4).
7. Check freedom
of rotation and
end play (thrust)
of the armature within
the assembly.
A
minimum of .005 inch end play is permissible.
Adjust to this tolerance if necessary by
adding or removing
thrust washers
(II) on drive end
of armature shaft.
Reissued:
10/11/79
HYDRAULIC SYSTEM
119
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