10/29/2020 REV. 003 29
e) Check the amount of oil being dispensed through the lubricator and adjust to 1-3 drops of oil
per minute. Excess oil can create a gummy residue and lack of oil will cause the blades to get
dry, crack and eventually lock up the motor.
4. The reverse button on the motor is sticking.
a) Check the amount of oil being dispended through the lubricator and adjust to only 1-3 drops of
oil per minute. Excess oil can create a gummy residue and cause the reverse button to stick.
b) Check the spring on the reverse button and make sure it is not broken or damaged. A spring can
be broken and still continue to work although some damage usually results. (a broken spring is
the number one reason for a reverse button sticking)
c) Check the reverse button itself for burrs or dings that may need filed. Clean the area around the
reverse button. Shavings or dirt particles can enter the gap between the housing and the
button and cause both wear and sticking.
5. The air motor is hot to the touch.
a) Check the amount of oil being dispensed through the lubricator. An insufficient amount of oil
will increase the friction created by the vanes. Set the lubricator to dispense only 1-3 drops of
oil per minute.
b) For insufficient oil, turn off the air supply and remove the air hose. Add 3-4 drops of oil directly
into the inlet adapter at the top of the motor. Reconnect the air hose and be sure that the hose
is securely seated before turning on the air supply.
c) A faulty bearing can cause the motor to run hot. There are two rotor bearings in the top half of
the motor, and two nose bearings in the bottom of the motor. Spare parts can be purchased
from FlexArm. Refer to the motor manual for replacement part numbers.
d) Lack of grease or excessive grease in the bottom gears of the motor can cause the motor to run
hot. Check the motor manual for type and amount of grease. Periodic maintenance should
include adding grease to the lower gear sets.
e) If the motor was taken apart and put back together, over tightening of the two halves can cause
the motor to run hot. This creates excess pressure on the bearings and gears.
f) If the motor mount screws are over tightened, the motor may start to run hot. The screws
should be nice and snug so the motor cannot spin in the mount. Any excessive force will tighten
the housing against the nose bearings and cause friction.
6. Oil is coming out of the exhaust of the air motor.
a) Check the setting of the filter/lubricator assembly. It should be set for 1-3 drops of oil per
minute. Excessive oil will cause a buildup in the two filters at the top of the air motor. If oil
continues to blow out the exhaust try turning the filter/lubricator off for a while and running
the motor without oil, then set back to 1-3 drops per minute.
b) If too much oil has accumulated in the two filters it will be necessary to simply replace the
filters. Call Midwest Specialties and provide the model number off of the air motor to obtain
replacement parts and service information.
7. Air is leaking out of the top of the air motor or quick release fitting.
a) Most air leaks at the top of the motor are found where the nylon hose connects to the push
release fitting. It is not unusual for a slight leak to occur when the hose is being flexed. (When
the FlexArm is fully extended). Disconnect the main air supply and remove the nylon hose from
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