Hangar 9 P-40 Warhawk Assembly Manual page 21

After flying for around 30 flights, you may notice
that the retracts will begin to have a little play. This
is normal and can easily be adjusted out. There are
two set screws to adjust the up and down stops for
these retracts.
Adjustments
Adjust the retract down stop by screwing the set
screw in slightly. It will only take a small amount,
so start by turning it around 1/16 of a turn. If the
set screw is tightened too much, the retract can
bind and stall the servo, placing unnecessary
current loads on the receiver battery.
Section 8: Retract Linkage Installation
Adjust the retract up stop by screwing the set screw
in slightly. Again, it only takes a small amount,
so start by turning it around 1/16 of a turn. Do
not tighten the set screw too much, as the retract
can bind and stall the servo, placing unnecessary
current loads on the receiver battery.
The adjustment procedure is common after about
30 flights, depending on your runway surface.
Check the operation of your retracts often to keep
them in the best working order. Keep this section
handy for future reference for your P-40 Warhawk
retracts.
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