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WARNING

•  For your own safety, be sure to read these procedures carefully before performing 

maintenance on this product. After reading this document, be sure to keep it handy for 
future reference.

 

This maintenance manual covers what you should know about maintenance of the Yamada NDP-5 series 
and NDP-15 series Diaphragm Pumps. 
This edition is based on the standards for the May 2015 production run. Remember, the specifications are 
always subject to change; therefore, some of the information in this edition may not apply to new 
specifications. 
 

·Warnings and Cautions 

For safe use of this product, be sure to note the following: In this document, warnings and cautions are 
indicated by symbols. These symbols are for those who will operate this product and for those who will be 
nearby, for safe operation and for prevention of personal injury and property damage. The following 
warning and caution symbols have the meanings described below. Be sure to remember their meanings. 

 

    If you ignore the warning described and operate the product in an 
    improper manner, there is danger of serious bodily injury or   

                                                                      death. 

 
    If you ignore the caution described and operate the product in an 
    improper manner, there is danger of personal injury or property   

                                 

    damage.

 

Furthermore, to indicate the type of danger and damage, the following symbols are also used along with 
those mentioned above: 

This symbol indicates a DON'T, and will be accompanied by an explanation on something 
you must not do. 

 

This symbol indicates a DO, and will be accompanied by instructions on something you 
must do in a certain situation. 

 

WARNING

• Before starting maintenance work, cut off the feed air and clean the pump. If air pressure or 

residue remain in the pump, there is danger of explosion, or possible poisoning resulting in 
serious injury or death if chemicals adhere to the skin or are accidentally swallowed. 
(For details on cleaning the pump, refer to Chapter 6 of the Operation Manual.) 

• When replacing parts, be sure to use the recommended genuine parts or Equivalents. Use of 

other parts may cause a malfunction of the product. 
(Refer to Exploded View and Reminder to order correct item on the separate sheets.) 

 

 

CAUTION

• When it is instructed that special tools must be used, be sure to use the specified tools. 

Otherwise, the pump may be damaged. 

• Refer to 10.1 "Specifications" in the Operation Manual. Also, remember that the pump is 

heavy, and extreme care must be taken when lifting it. 

 

     

 

WARNING

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CAUTION 

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Summary of Contents for NDP-5 series

Page 1: ...MAINTENANCE MANUAL YAMADA AIR OPERATED DOUBLE DIAPHRAGM PUMP NDP 5 NDP 15 Doc No NDP 183M 09...

Page 2: ...ution described and operate the product in an improper manner there is danger of personal injury or property damage Furthermore to indicate the type of danger and damage the following symbols are also...

Page 3: ...2 Inspection Ball valve types 4 Flat valve types 4 4 3 Installation 4 5 Diaphragm and Center rod 5 1 Removal FAT FST BA BS BPS types 5 FP FV FDT types 6 5 2 Inspection 6 5 3 Installation B H B S FPH F...

Page 4: ...me material is sucked into material chamber B Through repetition of this operation material is repeatedly taken in and discharged out 2 Tools etc 2 1 General tools Socket wrenches 10mm NDP 5 13mm NDP...

Page 5: ...e guide flat valve and valve seat NDP 5 Fig 4 2 Remove the O ring valve guide ball and valve seat NDP 15 Fig 4 2 Turn over the main body assembly Fig 4 3 Remove the 4 retainer bolts from the in manifo...

Page 6: ...the in manifold removes NDP 5 Remove the O ring valve stopper flat valve and valve seat Fig 4 6 Turn over the main body assembly Fig 4 7 Pull out the bolt and remove the base and in manifold NDP 5 Rem...

Page 7: ...is worn out or cracked replace it Usable range of Flat valve NDP 5 2 5 3 1 mm NDP 15 4 3 5 0 mm Valve seat Fig 4 12 Measure the dimension shown at left and if it is outside the usable range replace t...

Page 8: ...f the center rod Fig 5 2 After the nuts on one side have been removed remove the center disk and diaphragm Remove the diaphragm center disk and center rod from the opposite side of the main body NOTE...

Page 9: ...in body NOTE When the diaphragms are removed the main body is separated 2 pieces For easy work leave bolts fastened temporarily before remove the diaphragms Fix a double nut to one end of the center r...

Page 10: ...the bolts that balance should be equal from both side on diagonal line with even torque B C B N B T FPC FPN F T types For installation see Exploded View on the separate sheet and install in the revers...

Page 11: ...outside the usable range replace the bushing Usable range of bushing 10 1 10 3 mm Guide NDP 15 Fig 6 4 Measure the inside diameter and if it is outside the usable range replace the guide Usable range...

Page 12: ...assembly If the seal ring is worn out or cracked replace C spool valve assembly Usable range of seal ring NDP 5 1 40 1 48 mm NDP 15 1 82 1 90 mm Sleeve Assembly Fig 7 5 Measure the inside diameter an...

Page 13: ...rial on daily inspecting a pump Retainer bolts from the out chamber Retainer bolts from the manifold NDP 5 FPT FVT FDT 7 5 N m 7 5 N m NDP 15 FP FVT FDT 12 N m 12 N m NOTE Tighten the bolts that balan...

Page 14: ...Manufactured by YAMADA CORPORATION INTERNATIONAL DEPARTMENT No 1 3 1 Chome Minami Magome Ohta Ku Tokyo 143 8504 Japan PHONE 81 0 3 3777 0241 FAX 81 0 3 3777 0584 201710 NDP183M...

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