2.
Check tie bolts for looseness or failure.
3.
Check internal diameter of felt grease seals for distortion or wear. Replace the felt grease seal if surface is hard or gritty. Lightly coat felt grease seals with SAE 10 oil. (Do not soak felts in oil.)
4.
Check tire for cuts, internal bruises and deterioration.
5.
Check bearing cones and cups for wear and pitting and relubricate.
6.
Replace any wheel casting having visible cracks.
32-40-00 Page 32-71 Revised: December 6, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
ASSEMBLY AND INSTALLATION OF NOSE WHEEL. (Refer to Figure 32-17.)
1. Ascertain that the bearing cup for each wheel half is properly installed. Install the tire with tube on the wheel half with the valve stem hole and then join the two wheel halves. Install the through bolts with the washers and nuts to the valve stem side.
— Note —
Torque nuts as follows: Cleveland Wheel Assemblies - 90 inch-pounds; McCauley Wheel Assemblies - 140-150 inch-pounds.
On McCauley Nose Wheel Assemblies only, bushing is required to prevent tube movement.
2.
Position the tire and tube so the index mark on the tire is aligned with the index mark on the tube. This will maintain proper balance of the wheel. Inflate the tire to the specified pressure as given in Chart 601.
3.
Lubricate the bearing cones and install the cones, grease seals, felt rings and seal retainer rings. Secure with snap rings.
4.
Install the axle and spacer into the wheel assembly and install the wheel into the fork of the strut assembly. Secure in place with an axle plug on each end, axle rod, washers and self-locking nuts. Tighten the nuts until no side play is felt, yet allowing the wheel to rotate freely.
REPAIR OF NOSE AND MAIN WHEEL ASSEMBLIES.
Repairs are limited to blending out small nicks scratches. gouges and areas of slight corrosion, plus the replacement of parts which are cracked or badly corroded.
— Note —
Remove rust and blend out small nicks, using fine 400 grit sandpaper.
Wheels may also be repainted if the parts have been repaired and thoroughly cleaned. Paint exposed areas with one coat zinc chromate primer and one coat of aluminum lacquer.
— Note —
Never paint working surfaces of the bearing cups.
1. Bearing Cup Replacement:
A. Removal:
(1)
Insert wheel half into boiling water for 15 minutes or place in an oven not exceeding 250° F ( 121° C) for 15 minutes.
(2)
Remove from source of heat and invert wheel half. If the cup does not drop out, tap the cup evenly from the axle bore with a fiber drift pin or suitable arbor press.
B.
Installation:
(1)
To replace a new cup, apply one coat of zinc chromate primer to wheel half bearing bore.
(2)
Insert wheel half into boiling water for 15 minutes or place in an oven not exceeding 250°F (121°C) for 15 minutes. Chill new bearing cup in dry ice for a minimum of 15 minutes.
(3)
Remove wheel half from source of heat and bearing cup from the dry ice. Install the chilled bearing cup into the gearing bore of the heated wheel half. Tap gently to seat evenly in place, using a fiber drift pin or suitable arbor press.
32-40-00 Page 32-72 Revised: December 6, 2002
2I24
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
BRAKES.
BRAKE ADJUSTMENT AND LINING TOLERANCE.
No adjustment of the brake lining clearance is necessary as they are self-adjusting. Inspection of the lining is necessary, and it may be inspected visually while installed on the airplane. Linings of the riveted type should be replaced if the thickness of any one segment becomes worn below .100 of an inch or unevenly worn. The "snap-on" heavy duty linings should be replaced when the expansion groove is no longer visible.
WHEEL BRAKE ASSEMBLY.
REMOVAL AND DISASSEMBLY OF WHEEL BRAKE ASSEMBLY. (Refer to Figure 32-18.)
1.
To remove the brake assembly, first disconnect the brake line from the brake cylinder at the tube fitting.
2.
Remove the cap bolts that join the brake cylinder housing and the lining back plate assembly. Remove the back plate from between the brake disc and wheel.
3.
Slide the brake cylinder housing from the torque plate.
4.
Remove the pressure plate by sliding it off the anchor bolts of the housing.
5.
The piston(s) may be removed by injecting low air pressure in the cylinder fluid inlet and forcing the piston from the housing.
6.
Check anchor bolt for wear.
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