WACO YMF F5 Series Maintenance Manual page 17

No adjustment of the brake clearances is necessary. If, after extended service, brake blocks become
excessively worn, they should be replaced with new segments. See Parker Hannifin Maintenance
Sheets in Section 7 of this manual for details.
(8) Check tire inflation and condition. Keep 7:50 x 10 tires inflated to 30 P.S.I. Keep 10" tail wheel tire
inflated to 60 P.S.I. When checking tire pressure, examine the tires for wear, cuts, bruises and
slippage. Replace when required.
The main wheel tires are 7:50 x 10, 6 ply with tubes. The tail wheel tire is 10 x 3.5 x 4 with tube.
(9) Battery Service – Access to the battery is obtained by removing the cover in the top cowl and
removing the cover of the battery box. Check the drain tube to see that it is open and draining
properly. Check the box for condition; clean and paint as required.
The battery should be checked for proper fluid level. DO NOT fill the battery above the baffle plates.
DO NOT fill the battery with acid – use only water. A hydrometer check will determine the percent of
charge in the battery. Reinstall box cover and safety. Reinstall cowl cover.
If the battery is not up to charge, recharge starting at a 4 amp rate and finishing with a 2 amp rate.
Quick charges are not recommended.
(10) Induction Air Filter Service – The dry type of air filter must be inspected at least
every 50 hours, and more often, even daily, when operating in dusty conditions. The filter is
disposable and inexpensive and a spare should always be kept on hand for a rapid replacement.
(a) Removal of Engine Air Filter
The filter is located in the lower front of the engine cowl and is accessible in the chin scoop intake
with the cowling intact. It may be removed by the following procedure:
(1) Remove spring pin from top of filter.
(2) Remove the filter from intake opening.
(b) Cleaning Engine Air Filter
(1) Tap the filter gently to remove loose dirt particles, being careful not to damage the filter. DO
NOT wash the filter in any liquid. DO NOT attempt to blow out dirt with compressed air.
(2) If the filter is excessively dirty or shows any damage, discard it and replace it immediately.
(3) Wipe the filter housing with a clean cloth.
(c) Installation of Engine Air Filter
(1) After cleaning or when replacing the filter, install the filter in the reverse order of removal.
(11) Propeller Service – Clean propeller with water and mild detergent. Inspect blades
and tipping for damage and repair as required. The complete propeller and hub should be waxed
periodically. Whether prop is wood or metal, it should occasionally be checked for balance, leading
edge repairs and generally reconditioned. It is suggested that it be returned to the propeller factory
for reconditioning. For additional service instructions, see Sensenich instruction sheets or MT-
Propeller maintenance instructions, as applicable, in Section 10 of this manual.
(B) 100 Hour Inspection – Every 100 Hours
(1) Give airplane a regular 50 hour check as outlined above.
(2) Remove weight from one side of the landing gear at a time so that the wheels can be tested for play
in the splined section of the oleo struts. The allowable play is movement of ½ inch from extreme toe-
in position to extreme toe-out position on each wheel at outer circumference of tire. When play
exceeds this, install new bronze splined bushing.
REVISION: H
RELEASED: 07/21/2017
WACO Classic Aircraft Corporation
YMF WACO F5 SERIES MAINTENANCE MANUAL
Page
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PART NO. YMFAMM-1