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6-7. CLEANING, INSPECTION AND REPAIR.
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 scratches, 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
required.
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: Ensure 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. (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 (11), 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 ensure 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 (11) on drive end of armature shaft.
01/01/09
PIPER SENECA II SERVICE MANUAL
1I9
VI - HYDRAULIC SYSTEM
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Questions and answers
How to repair battery plane battery box
To repair the battery box on a Piper Seneca II, follow these steps:
1. Clean the Battery and Box – Remove corrosion by applying a baking soda and water solution mixed to a thin cream consistency. Continue applying until bubbling stops.
2. Rinse and Dry – Rinse thoroughly with clean water and dry completely.
3. Paint if Necessary – Apply acid-resistant paint to the battery box if needed and allow it to dry completely.
4. Place Drain Cap – Ensure the cap is placed over the battery box drain.
5. Reinstall the Battery – Once the box is prepared, reinstall the battery properly.
Caution: Avoid letting the soda solution enter the battery.
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