30
MIT 4000 / MIT 5600 / MIT 8900
Remove external diaphragm fastener by turning it counter-clockwise with a 34 socket wrench to
remove diaphragm group from diaphragm shaft. One of the diaphragms shall be removed with
internal and external diaphragm fastener and the other shall be removed as connected to the
shaft. First, place the internal diaphragm fastener on a vice to remove the diaphragm between
internal and external diaphragm fastener and tighten it, and remove it by turning it counter-
clockwise with a 34 socket wrench. Fasten the shaft connected to other diaphragm to the clamp
loosely and remove it with the wrench. Repeat the same steps to remove the other diaphragm.
Check the diaphragm for cut, puncture, wear and chemical exposure. Replace the diaphrams
when necessary.
Installation of the Diaphragm
MIT 160
Fasten external diaphragm to fastener and push from central hole of the diaphragm to inside.
Tighten the internal diaphragm to the shaft clockwise by installing bolt. Re-install loose group to
the clamp. Tighten diaphragm group with 12 socket wrench.
MIT 550
Fasten external diaphragm to fastener and push from central hole of the diaphragm to inside.
Tighten the internal diaphragm to the shaft clockwise by installing bolt. Re-install loose group to
the vice. Tighten diaphragm group with 19 socket wrench.
MIT 1500
Insert the M16 bolt into the outer diaphragm holder and push it through the center hole of the
diaphragm. Internal diaphragm tighten the shaft clockwise by attaching the bolt to the holder. Put
the loose rolled group back to clamp. Tighten the diaphragm assembly together with M16 wrench.
MIT 4000 / MIT 5600 / MIT 8900
Fasten external diaphragm to fastener and push from central hole of the diaphragm to inside.
Tighten the internal diaphragm to the shaft clockwise by installing bolt. Re-install loose group to
the vice. Tighten diaphragm group with 34 socket wrench.
Installation of The Diaphragms To The Pump
Make sure that ram was installed on the diaphragm shaft. Tighten a diaphragm group shaft until
it comes to same line with shaft end of internal diaphragm plate to threaded hole on diaphragm
end clockwise. Install the shaft to the pump. Align bolt holes in the diaphragm with bolt holes
of internal chamber. Connect external chamber to the pump by using bolts and nuts. Pull the
diaphragm shaft from the other end of the pump. Ensure that nose is installed on diaphragm
shaft. Tighten open shaft of the diaphragm group to the diaphragm shaft clockwise as much
as possible, and leave a gap to allow alignment of the bolt holes on the diaphram with the bolt
holes of the internal chamber. Install the external chamber to the pump by using bolts, nuts and
washers. Connect the suction and discharge lines to the pump by using bolts, nuts and washers.
The pump is ready to be re-fastened and used.
Air Valve Kit Types and Maintenance
Air valves are lubricated with special greases, and require no more greasing. Disconnect the
air inlet to the pump once 1 or 2 weeks if additional lubrication is needed. Add 4 - 5 pumps of
machine oil through the air inlet of the pump.