YAMADA DP-10F, DP-20F Maintenance Manual

MAINTENANCE MANUAL

YAMADA AIR-OPERATED DIAPHRAGM PUMPS

DP-10Fi
DP-20Fi

Doc. No. NDP 149M-06

WARNING

- For safety’s sake, be sure to read this maintenance manual thoroughly before starting
maintenance for this product. After reading the manual, keep it in an easy-to-access place so
that the user may refer to it whenever necessary.

This maintenance manual describes the items required for maintenance of the Yamada DP-Fi series
Diaphragm Pumps.
This document is based on the products that are manufactured in March 2011. Note that its contents are
subject to change as a result of specification changes to be made in future.

- Warnings and Cautions

To use this product safely, be sure to observe the contents of the following description. In this manual,
warnings and cautions are indicated by using symbols. These symbols are intended to prevent death or
serious injury that may be caused to the operator or those who are around the product and damage that
may be caused to the articles that are around the product, as well as to use the product safely and correctly.
Each symbol is indicated and has a meaning as shown below. Read the description with a good
understanding of its contents.

WARNING :

This indicates the existence of potential hazard which, if not
avoided, will result in death or serious injury.

CAUTION :

This indicates the existence of potential hazard which, if not
avoided, may result in bodily injury or in physical damage.

To indicate the contents of danger and damage, the following symbols are used together with the above
indications.

This symbol indicates an act that is prohibited (prohibition). The concrete contents of
prohibition are indicated by the side of the indication.

This symbol indicates the contents that must be observed. The concrete contents of
observance are indicated by the side of the indication.

WARNING

- Before starting the maintenance work, shut off the supply air and clean the pump. If air
pressure or residual liquid remains in the pump, damage or explosion may be caused to the
product or serious injury or death may be caused if it sticks on the eyes or skin or inhaled or
swallowed. (For cleaning the pump, refer to Chapter 6 of the Operation Manual.)

- When replacing parts, be sure to use the genuine parts or equivalents. Using parts other than
these parts may result in a fault.

(Refer to Exploded View and Reminder to order correct item on the separate sheets.)

CAUTION

- When it is indicated that dedicated tools should be used, be sure to use these dedicated tools,
otherwise the pump may be damaged.

- Check the weight of the pump by referring to 10.1 Main Specifications in the operation manual
and take extreme care when lifting it.

Table of Contents

· Warnings and Cautions

· Table of Contents

1. Principles of operation ·························································· 1

2. Tool and Others Required

2.1 General tools ······································································ 1

2.2 Dedicated tools ··································································· 1

2.3 Others.·············································································· 2

3. Ordering Replacement parts ················································· 2

4. Base

4.1 Removal ············································································ 3

4.2 Installation ········································································ 3

5. Valve Body and C Spool Valve Assembly

5.1 Removal ············································································ 4

■ Valve body assembly ·························································· 4

■ Disassembling of the C Spool Valve ······································ 6

5.2 Inspection ·········································································· 7

5.3 Installation ········································································ 8

6. Ball Valves and Valve Seats

6.1 Removal ············································································ 9

6.2 Inspection ·········································································10

6.3 Installation ·······································································10

7. Diaphragm and Center Rod

7.1 Removal ··········································································· 11

7.2 Inspection ·········································································13

7.3 Installation ·······································································13

8. Pilot Valve Assembly

8.1 Removal ···········································································15

8.2 Inspection ·········································································15

8.3 Installation ·······································································15

9. Retightening of Tie rods ·······················································16

1

1. Principles of operation

Liquid material chambers are located inside and air chambers are located outside of the DP-Fi
series pump.When compressed air is supplied to the air chamber “a” (see the left figure below) by the
switch valve of this pump, the center rod starts moving to the left to cause liquid in the liquid
material chamber “A” to be pushed out to the discharge port, and at the same time liquid is sucked
into the liquid material chamber “B”.
When the center rod moves full-stroke to the left, the switch valve is automatically switched,
compressed air is sent to the air chamber “b”, and the center rod moves to the right, that is, toward
the opposite direction (see the right figure).
As the result, liquid in the liquid material chamber “B” is pushed out to the discharge port, and at
the same time liquid is sucked into the liquid material chamber “A”.
Thorough repetition of this operation, liquid is repeatedly taken in and discharged out to construct
a diaphragm pump.

2. Tools and Others Required

2.1 General tools

・Socket wrenches 13 mm , 19 mm ・Flat head screw driver
・Open-end wrenches 13 mm , 19 mm ・Snap ring pliers
・Hexagonal wrench 6 mm
・ Plyer

2.2 Dedicated tools

① Valve cap remover (supplied)
Purpose: Removing the valve cap and

valve stopper.

(Part No. for DP-10Fi: 832516)

② Valve cap remover (Fi/□/R only supplied)
Purpose:

DP-10Fi, DP-20Fi: Removing the valve cap
DP-20Fi: valve stopper.
(Part No. for DP-20Fi: 832517)

③ Guide holder remover (optional)
Purpose:

DP-10Fi, DP-20Fi: Removing the guide holder and spring seat.

(Part No. 832518)

Liquid material

chamber “B”

Air Chamber ”ｂ”

Air Chamber “a”

Air Chamber “ｂ”

Air Chamber “a”

Liquid material

chamber “A”

Liquid material

chamber “B”

Liquid material

chamber “A”

2

④ Sleeve remover (optional)
Purpose: Removing sleeves, valve seat and

funnel.

(Part No. 713148)

⑤ Cap remover (optional)
Purpose: Removing a cap.
(Part No. 771132)

⑥ Ring Wrench
DP-10Fi/

□/H (Part No. 832802)

DP-20Fi/

□/H (Part No. 832803)

⑦ Support Ring Wrench
DP-10Fi/

□/H (Part No. 832804)

DP-20Fi/

□/H (Part No. 832805)

2.3 Others.

・ Assembly lubricating oil Fomblin® GR AR555 or equivalent
・ Bolts M8 ×1.25×30 or larger

3. Ordering Replacement parts

For accurate and speedy shipment of parts, be sure to order the right parts for your model to
distributor.
Indicate the part numbers, descriptions, and quantities.

3

4. Base

4.1 Removal（only Fi/□/R）

Follow the steps below to separate the pump main unit from the base.

・ Remove the fixing screw (one). [Fig.4-1]

・ Slide the pump main unit toward the fixing screw, then

raise and remove it from the base. [Fig.4-2]

4.2 Installation

For installation, see [Exploded View] on the separate sheet and install in the reverse order of
disassembly.