IWAKI WALCHEM MDH-400 Series Instruction Manual Download Page 2

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IWAKI WALCHEM

MAGNETIC DRIVE PUMP

MDH-(F) SERIES

INSTRUCTION MANUAL

IWAKI WALCHEM Corporation

Summary of Contents for MDH-400 Series

Page 1: ...heck that the pump body and parts have not been accidentally damaged or that any bolts or nuts have not been loosened in transit Thank you for selecting an Iwaki Walchem MDH F Series magnetic drive pu...

Page 2: ...IWAKI WALCHEM MAGNETIC DRIVE PUMP MDH F SERIES INSTRUCTION MANUAL IWAKI WALCHEM Corporation...

Page 3: ...Guide 2 3 Specifications 3 4 Handling 5 5 Installation Piping and Wiring 7 6 Operation 11 7 Maintenance and Inspection 14 8 Troubleshooting 19 9 Parts Description and Exploded View 23 10 Disassembly a...

Page 4: ...401 422 423 425 Bearing Option C R S A C F Bearing Carbon PTFE Carbon Carbon Spindle Alumina Alumina 316 S S Alumina Alumina High Purity Front Thrust Ceramic Ceramic 316 S S Ceramic Ceramic Alumina R...

Page 5: ...ecific gravity fluids up to 2 0 can be handled with appropriate trimming of impeller Consult Iwaki Walchem or your distributor for recommended model and impeller trim 5 The MDH 401 7 when coupled to a...

Page 6: ...amic 316 SS Alumina ceramic 99 8 Alumina ceramic Bearing Carbon PTFE Carbon Alumina High density carbon ceramic Mouth Ring PTFE PTFE Thrust Ring Alumina ceramic 316 SS Alumina ceramic 99 8 Alumina cer...

Page 7: ...at the pump be allowed to cool for at least 20 minutes after dry running before introducing fluid again E Models Pumps identified with E at the end of the model identification cannot endure dry runnin...

Page 8: ...and capacity of the pump may be lower than in the case of pure water The required driving power may also vary and should be checked 7 Intermittent operation Frequent start stop switching shortens the...

Page 9: ...easy maintenance n Installation 1 The pump anchoring area must be greater than the area of the pump baseplate If the anchoring area is not large enough the baseplate may be damaged due to the concentr...

Page 10: ...ll a straight pipe which is more than 20 inches long or 10 times as long as the suction port diameter before the suction port of the pump Use the largest possible radius of curvature for the bend 5 Do...

Page 11: ...or more below the surface of the liquid 9 A screen should be provided at the inlet of the suction tank to prevent the entrance of foreign matter into the suction pipe Foreign matter may cause malfunct...

Page 12: ...piping resistance Other wise the specified performance may not be obtained due to increased piping resistance 4 A check valve should be installed if any of the following conditions exists in the pipin...

Page 13: ...re of liquid in the pump may cause damage to the pump 7 In the event of a service power failure turn off the power switch immediately and close the discharge valve n Wiring Use appropriate wiring mate...

Page 14: ...round the impeller 6 If using flooded suction measure the pressure in the suction pipe to check that the pump is filled with liquid 7 Run the motor momentarily to check the direction of motor rotation...

Page 15: ...r is unavailable check values of If pump enters continuous operation discharge pressure suction pressure and current condition check flow meter and confirm in relation to piping resistance that pump o...

Page 16: ...n of each measurement If the valve re mains open during operation the gauge mechanism may be affected by abnormal pressure caused by water hammer 4 If a spare pump is included in the installation keep...

Page 17: ...butor if abnormality is observed Replace if abnormality is observed Clean l Is there scoring in rear face or cylindrical body l Are there any cracks in the plastic of the rear section or cylindrical b...

Page 18: ...s of Spindle Bearing Mouth Ring Impeller Thrust If the difference between Bearing I D and Spindle O D exceeds 0 039 in 1mm either the bearing or the spindle whichever has the greater wear should be re...

Page 19: ...f the surfaces are worn out beyond the wear limit A the pump is subject to serious damage The condition of the surfaces in contact must be checked if an abnormal operation such as dry running or cavit...

Page 20: ...102 2 60 039 1 0 5 Physically confirm that clearances are adequate by spinning impeller by hand in rear casing Tips are not worn out beyond wear limit The impeller and magnet capsule rotate smoothly...

Page 21: ...abnormally low l Magnet coupling is disconnected Stop pump and use a screw driver to check for easy and smooth rotation of motor fan Measure current level to check for low reading Check for foreign ma...

Page 22: ...ter Needles of pressure gauge and vacuum gauge fluctuate l Air enters via suction pipe or gasket section Check flange gaskets of suction pipe and tighten Vacuum gauge needle indicates high value while...

Page 23: ...Clock wise when viewed from motor side Check whether voltage and frequency levels are adequate l Overload Check whether specific gravity and viscosity of liquid are above specifi cation Stop pump and...

Page 24: ...pipe is closed or restricted Cavitation is caused l Wear or melting of pump bushing l Damaged inner magnet assembly or pump spindle l Fluctuating dynamic balance of outer drive magnet assem bly l Wea...

Page 25: ...outh ring 1 14 Bolt w washers 6 4 Magnet capsule bearing assy 1 15 Bolt w washers 2 6 Bearing 1 16 Bolt w washers 4 7 Rear casing spindle unit 1 17 Flange option 2 10 Drive magnet assy 1 18 O ring opt...

Page 26: ...sembly 1 Loosen and remove front casing bolts 14 and 15 2 Remove front casing 1 Wash and clean pump inside 3 Remove impeller 2 and magnet capsule 4 from rear casing 7 Magnet capsule should be kept fre...

Page 27: ...and protrudes from the bottom of magnet capsule Fig 12 Bearing MDH F 422 423 425 1 Separate the impeller from magnet capsule by unscrewing it counterclockwise from impeller side Note If the impeller c...

Page 28: ...r MDH F models 2 Lift up and remove mouth ring by applying a screwdriver to the bottom of mouth ring 3 Place new mouth ring into impeller properly Align recessed area of mouth ring with mating surface...

Page 29: ...y using a strap wrench Should the impeller be hard to screw on place magnet capule in hot water approx 194 F 90 C for five minutes then assemble Gap between rear shroud of impeller and top of magnet c...

Page 30: ...ing information 1 Description and item number according to this instruction manual 2 Pump model number and serial number as shown on the nameplate of the pump 3 Drawing number if you have received a c...

Page 31: ...Model Connections Series NPTM A E1 HL F H CP O D X Y Z 400 1 x 1 5 51 4 33 5 67 3 86 0 47 8 75 8 27 3 74 4 53 3 19 2 00 140 110 144 98 12 222 210 95 115 81 51 401 1 x 1 6 30 5 12 7 00 5 12 0 47 11 50...

Page 32: ...10 28 55 x 1 4 12 24 10 59 5 31 5 28 3 27 2 56 260 230 150 261 14 x 36 311 269 135 134 83 65 Model Pump Weights without motor lbs kg 425 44 20 n MDH F 425 Weight Dimensions Note 1 Overall length varie...

Page 33: ...WALCHEM CORPORATION 5 BOYNTON ROAD HOPPING BROOK PARK HOLLISTON MA 01746 USA TEL 508 429 1440 FAX 508 429 1386 E MAIL IWAKIWALCHEM IWAKIWALCHEM COM ON THE INTERNET AT WWW IWAKIWALCHEM COM P N 180118 H...

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IWAKI WALCHEM MDH-400 Series, Instruction Manual

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