Piper Comanche PA-24 Service Manual page 260

D. To install the square tube with sprocket assembly, proceed as follows:
1. Position sprocket (26 or 27) in sprocket brackets (4 or 8) and place washer (38) on square tube
shaft (3).
2. Slide square tube shaft into sprocket bracket and sprocket. Attach sprocket with bolt, washer
and hex nut (12) using Kaynar wrench (P/N W10-3).
3. Place washer and self locking nut (31) on sprocket axle (36). Tighten nut (31) to allow no end
play while permitting the shaft to rotate freely, from stop to stop. Check the stops to insure a
minimum engagement of .062 of an inch between the sprocket stop pins (30) and the aileron
stop (29) as shown in Sketch D. Place the bulkhead seal over the large nut (31) at the forward
side of the sprocket bracket.
4. Align holes in sprocket bracket with those in the bulkhead and install bolts and screw securing
the sprocket bracket to the bulkhead.
5. Install and tighten cap bolts in horizontal brace.
NOTE: If an Autopilot roll servo is to be installed on the forward end of the square tube shaft
forward of the bulkhead, it may be installed at this time.
E. To install the control wheel tube (2), proceed as follows:
1. Lubricate the friction surface of the collars and cable attachment fitting bearings with a light
film of grease (MIL-G-3278).
2. After sliding the control column cover (35) onto the control wheel tube (2), insert the tube
through the instrument panel. Slide the control tube into the aft collar (22) and one-half the
seal washers (18). Slide the cable attachment fitting (20) with cable arm forward onto the
control tube followed by the remaining seal washers (18) and forward collar (21). Insert the
end of the control tube over the square tube (3) until the control tube contacts the roller bearing
housing.
3. If the control wheel tube fits easily over the guide blocks (23), align the cable attachment
fitting and collars as marked and tighten the cap bolts (17).
4. Check that there is minimum end play in the bearing tolerance (0.003 to 0.013 of an inch), and
that the control tube rotates freely from stop to stop. Install safety wire (16) in the cap bolts.
5. Install and tighten screw in control wheel cover (35).
F. To attach chains to sprocket, use the following procedure:
1. With the control wheels centered, wrap the horizontal chains (5 and 7) around sprockets (26
and 27). The horizontal turnbuckles (6) should be centered between right and left sprockets.
Connect turnbuckles and tighten to allow no slack. Safety turnbuckles.
2. With the control wheels still centered, wrap the vertical chain (13) around its sprocket. The
chain ends should be even with one another. Connect the control chain with the aileron control
cables. Set cable tension per Table V-I and check rigging and adjustment as given in paragraph
5-11. Safety turnbuckles.
3. Check that the control wheel will roll from stop to stop with no binding.
NOTE: To replace stud assembly in left tube (see Sketch D in Figure 5-5). Place stud (P/N
23394) in square tube, align hole in stud with aft hole in square tube and insert roll
pin. Drill .187–.192 hole through stud using forward hole in square tube as pilot and
insert second roll pin.
V - SURFACE CONTROLS
PIPER COMANCHE SERVICE MANUAL
1F24
04/01/09