Piper PA-34-200T Seneca II Service Manual Download

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PIPER SENECA II SERVICE MANUAL

7-52. CLEANING, INSPECTION AND REPAIR.

Clean the assembly with a suitable solvent and dry thoroughly.

Check the wall of the cylinder housing and piston for scratches, burrs, corrosion, etc., that may
damage “O” rings.

Check the general condition of the brake bleeder screw and lines.

NOTE: Heavy duty wheel assemblies and brake discs may be easily identified by a six (6) bolt hole

pattern. Standard wheel assemblies and disc brakes have a three (3) bolt hole pattern.

Check the brake disc for wear, grooves, scratches or pits. Minimum disc service thickness is shown
in Figure 7-13. A single groove or isolated grooves up to .031 of an inch deep would not necessitate
replacement, but a grooving of the entire surface would reduce lining life and would indicate that
the disc should be replaced. Should it be necessary to remove the wheel disc, refer to Paragraph 7-
42. To inspect the press-on type heavy-duty brake lining, check the expansion groove. If groove is
not showing, replace linings.

At each periodic maintenance inspection, visually inspect both wearing surfaces of the brake disc
for heat checks. Replace brake disc if crack length exceeds .800, or crack depth exceeds .210. If
crack depth is not measurable, replace disc if crack length exceeds .400.

NOTE: Any crack, regardless of length and or depth, extending into the welded seam between the

flange and cup, is cause for immediate replacement.

The riveted type lining may be removed from the backing plates by drilling out the old rivets using
a 5/32 drill. Install a new set of linings using the proper rivets and a rivet set that will properly stake
the lining and form a correct flair of the rivet. The snap-on type lining used on optional heavy duty
assemblies may be removed by prying loose with a screwdriver or a thin flat wedge. Install the
snap-on type by positioning onto the pins and applying pressure to snap into position.

NOTE: After replacing brake linings on Cleveland 30-65 brakes, perform a minimum of six light

braking applications with time left between stops to allow them to cool.

After replacing the brake linings on Cleveland 30-83 brakes, execute two consecutive full
stop braking applications from 30 to 35 kts. Do not allow the brake discs to cool
substantially between stops.

7-53. ASSEMBLY AND INSTALLATION. (Refer to Figure 7-14.)

If anchor bolts have been removed, they should be reinstalled as follows:

Support anchor bolt in a holding fixture. (Refer to Figure 7-15. Step A.)

Align cylinder body over anchor bolt. (Refer to Figure 7-15. Step B.)

Using a suitable arbor press, apply pressure on the spot face directly over the anchor bolt.
(Refer to Figure 7-15. Step C.)

Lubricate piston O-rings (3) with hydraulic fluid (MIL-PRF-5606H) and install on pistons (2). Slide
piston into cylinder housing (1) until flush with surface of housing.

Piper PA-34-200T Seneca II, Service Manual

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