Liquid Controls MA4 Meter - Manual (Page 23)

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4. The rotors should have a small amount of end-play
and be easy to turn. Test each rotor one at a time.
Turn the rotors to make sure that they revolve freely.
Jog the rotors from end to end to check for end-play.
If they do not move easily in both tests, remove the
rotors and check for burrs and corrosion deposits.
Clean them thoroughly. Repeat steps 2,3, & 4.
5. The rotor key is a small wedge of metal. Each rotor
has a notch, or “keyway”, to hold a key. Position a
key into each one of the three rotors. Press the keys
into the rotor keyways with your thumb and forefinger.
6. Slide the blocking rotor gear on its tapered rotor end.
Slide the right displacement rotor gear on its tapered
rotor end so that the timing marks line up between
the two gears. See “Timing the Rotor Gears” on Page
24.
Hint: Before you place the right displacement rotor
gear on its tapered end, hold the right rotor gear in
position. Turn the blocking rotor gear. Try to line up
the timing marks before you place the right
displacement rotor gear on its tapered rotor end.
7. Position the left displacement rotor gear on its tapered
rotor end so that its timing mark lines up with the
blocking rotor gear. See “Timing the Rotor Gears”
on Page 24.
Reassembling the Meter