MAULE MX-7-420 TURBO-PROP, Руководство по обслуживанию

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MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MX-7-420
23
Rev. A
LANDING GEAR, WHEELS AND BRAKES
MAIN LANDING GEAR:
MAIN LANDING GEAR:
TOE-IN:
If ground handling of the airplane makes toe-in suspect, inspect main landing gear as follows:
1. With airplane unloaded, jack-up airplane on one side and spin tire. If center groove runs true, do
same on other side. If not, mark tire, or both tires as needed, while spinning with black marker
pen.
2. Support tail to level (flight attitude) with main tires on floor. Measure from the floor to centerline of
axle and using that dimension, measure up from floor on front of tire in center and on back of tire
and mark. Do same on other side.
3. Measure between grooves and/or mark(s) at height marks, across front and then rear. The differ-
ence should be 0” to 1/4” toe-in for 7:00 tires and 0” to 3/8” toe-in for 8:50 tires.
LANDING GEAR SHOCK ABSORBER:
This gear is supported by two spring oil type oleo struts which must be full of oil at all times. The oil may
be checked by removing a 1/8” pipe plug at the top end of the strut. If oil is needed for P/N 4015B oleo
spring, use New Holland No.134 hydraulic oil or Ford Tractor No. ESN-M2C134-D. 10W30 engine oil
may also be used. For P/N 4161B oleo spring use API GL-4 or GL-5 85W-140 gear oil.
DISASSEMBLY OF OLEO STRUT:
1. To remove the strut, the weight must be taken off of the gear. The bolt at the top and bottom can
then be removed, freeing the strut. Higher strength top bolts are available to eliminate bending
from hard landings.
2. Remove four (4) bolts at top of strut.
3. Remove oil filter plug.
4. Pull out cylinder head and spring assembly.
5. To remove spring, take all nuts off of strut shaft and press piston upward to free bolts for removal.
Remove bolts, and piston will come out of end of shaft.
6. Replace worn parts, weak spring, etc. New replacement springs are stronger than the original
springs. The “O” ring on the strut shaft and on the cylinder head should be replaced at this time
also.