Doc. No.

900409E-09

OPERATION MANUAL
OIL PUMP
DR-50A1 (DRUM TYPE) ITEM No.852628
SH-50A1 (SIPHON TYPE) ITEM No.852629

WARNING
Prior to operating this pump, be sure to read this operation manual for safety. After reading the manual, please
keep it at hand any time for your quick reference.
 1/3

- Preface
Thank you very much for purchasing Yamada Pump. This pump, driven by the compressed air from an air
compressor, is designed to pump out or transfer lubricant from drum cans or other vessels. The material of the liquid
contact section of the machine is aluminum alloy (A6061 - T6), and that of the seal section is NBR. Any solvent which
does not agree to these materials is not available.

- For Safe Operation

This manual describes the items that are important for the user to operate this product safely, correctly, and efficiently.
Before operating this product, read this manual thoroughly, in particular, “Warnings and Cautions” at the beginning of
this manual.

- 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.

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

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

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

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.
 2/3

- Precautions on Use
The following warnings and cautions are very important. Be sure to observe them.

WARNING
- Keep your face away from the exhaust and discharge ports. Material may suddenly come out. There is
a possibility of losing eyesight if it strikes eyes.

- Gasoline is a high volatile fuel. Do not use it to clean the pump in any case, otherwise ignition or
explosion may be caused.

- Keep your fingers away from each port to avoid injury from moving parts.

- Modification of this pump may lead to death, bodily injury, or a failure. Do not modify it in any case
because it involves a risk.

- The operator and maintenance engineer should read the operation manual thoroughly before operating
the pump and performing maintenance in respect of this pump.

- Always wear proper safety equipments(facemask, ear plugs, and safety shoes, etc.) when installing,
operating and disassembling the pump.

- Make ground connection when working with flammable material or in explosive atmosphere. Rapid
pumping of material can result in static electrical charge.
Also, be sure to provide proper ventilation where a flammable atmosphere may exist.

- Execute the daily checkup.

- Use this pump according to the product specification.

- Attach a valve(for stop in emergency) or regulator to the air supply pipe to keep supply air pressure
under 0.7 MPa.

- Discontinue it when you feel a hazard or abnormality during the work. And correspond according to the
troubleshooting.

- Stop pump operation immediately when a drum becomes empty. Running the pump dry will cause
excessive vibration, resulting in reduction of pump life and damage to other equipment.
Be especially careful when pumping explosive material. Mixture of an air and vaporized material can
explode. If there is any possibility of running dry, install a dry-run protection device like a liquid level
control.

- Before maintenance operation, be sure to stop air from being supplied to the pump, and release the
internal pressure (both air and material) of the pump. There is danger such as spouting of the material
when the maintenance work is done with air supplied.

- Do not discharge material directly onto the ground. Dispose of harmful materials according to the
requirements specified in SDS or local regulations. Also, dispose of pump according to the local
regulations after removing residual material from inside pump. (Please contact industrial waste disposal
service.)

- (SH type only)If using a wall mount bracket for installation, the wall must be strong enough to withstand
vibration of the pump.
 3/3

CAUTION
- Keep hands and fingers away from the pump during operation to avoid injury from moving parts.

- Use pump for the material suitable for the specification. Parts may be corroded and material leak from
the damaged parts can lead to environmental pollution. Also, follow handling notes (SDS) of the
manufacturer about the handling of the material used.

- Take fall-prevention measures if using a slim or light tank. Risk of falling will be increased due to shift in
center of gravity caused by change in the material level in a tank.

- Take protective measures against rainwater and dust. It is likely to lead to the pollution of the material.

- Be very careful about the edge of the pump when you lift the pump. Your hands might be injured.

- Be very careful about your posture when installing the pump. Back injury may be caused by lifting the
pump.

- Do not touch the surfaces of the pump and the hose when pumping high-temperature material. Risk of
burns exists.

- Stop the air supply source after the end of work when not using this pump for a long time such as
nighttimes and holidays. Also, open the valve of the exhalation port and liberate pressure in the pump
and the hose. There is a possibility of polluting facilities because of the damage of the hose and the
leakage of the valve. Such a secondary disaster becomes a responsibility on the user side.

- (DR type only)Place a drum on a flat, level surface to position pump horizontally against a ground.
Operating the pump on a slope may cause a fall or tip-over due to shift in center of gravity caused by
change in the material level.

- (DR type only)Material remaining inside or on the surface of the pump may spill out by inserting or
removing the pump into/from a drum. Be very careful not to get your clothing dirty.
 Table of Contents

- Preface
- For Safe Operation
- Warnings and Cautions
- Precautions on Use
1. Names and Materials of Parts
1.1 Names and Materials of Parts ............................................................................................. 1
1.2 Contents of Package ........................................................................................................... 1
2. Principle of Operation ........................................................................................................... 1
3. Installation .................................................................................................................... 1
3.1 For the Drum Pump ............................................................................................................. 2
3.2 For the Siphon Pump ........................................................................................................... 2
3.3 Connecting the ground wire ................................................................................................. 3
4. Air Connection ........................................................................................................................ 3
5. Operating Method ................................................................................................................... 3
6. Maintenance and Inspection
6.1 Troubleshooting and Corrective Measures .......................................................................... 4
6.2 Maintenance and Inspection ................................................................................................ 4
7. Disassembly and Assembly................................................................................................. 5
8. Parts Disassembly Drawing and Parts List ..................................................................... 6
9. Pump Specifications .............................................................................................................. 7
10. Accessary for SH-50A1 (852629) ........................................................................................ 8
11. Limited Warranty .................................................................................................................... 9
1. Names and Materials of Parts
1.1 Names and Materials of Parts
[Drum pump] [Siphon pump]

1.2 Contents of Package

This machine is packaged in a corrugated fiberboard case.
Please make sure no damage during shipment and no missing accessories after unpacking as soon as possible.
Please make sure no loose screws, piping connections, and fastener components.
Please retighten if any screws, piping connections, and fastener components are loose.

2. Principle of Operation (Fig. 1)

The Yamada air-powered pump is a reciprocating type pump that is driven
by compressed air. The pump consists of an air motor section to drive the
pump and a lower pump to pump up the material as shown in the
Fig. 1 at right.
When the compressor feeds compressed air to the air motor, the air piston
starts up/down reciprocating motion by means of the function of the built-in
air changeover mechanism.
This function is transmitted to the piston of the lower pump by the
connecting rod that connects the air piston of the air motor to the piston of
the lower pump, and gives up/down reciprocating motion to it.
The material is pumped into the lower pump by the up/down reciprocating
motion of the piston of the lower pump and discharged by pressure from
the discharge port. Fig. 1

3. Installation

CAUTION
- Apply sealing compound or sealing tapes to the male screws and tighten tightly when the pipes are
connected. Be careful not to allow the sealing materials to enter the piping.
Do not apply the tip of the terminal (two thread ridges) to maintain conductive property of the ground.
(However, no applying is necessary if it will be connected to the hose union.)
Check that there is no leakage or electrical continuity in each part after connecting the piping.

1
 3.1 For the Drum Pump
1) Unpack and take out the pump.
2) Fix the pump with a vise and connect a prepared material hose to its
discharge port. When this is done, it is recommended to purchase and attach
a hose union to between the pump and hose. (Fig. 2)
3) Unplug the inlet port (2”) of the drum can and screw in the bung adapter
connected to the pump. (Fig. 3) Fig. 2
4) Insert the pump into the bung adapter. After the lower end of the pump (foot
valve section) hits the bottom of the drum, lift the pump by 2 - 3 cm to secure
a gap between the bottom of the drum and the foot valve. After determining a
position, tighten a wing bolt of the bung adapter to fix the pump. (Fig. 4)
<NOTE>
- The procedure is also available for resin type drums. Screw in the upper
screw of the bung adapter into the drum. Fig. 3

CAUTION
- When using a covered vessel such as a drum can, be
sure to loosen a vent plug so that the inside of the vessel
will not be evacuated.

3.2 For the Siphon Pump

1) Loosen the bolts of the pump fixing band for the mounting bracket (option,
product number 800400) to remove the band. Set the pump onto the
bracket, support with the pump fixing band, and fix with accessory bolts.
When this is done, tighten the bolts to such an extent that the pump will
not rotate. (The tightening torque is 12N-m or less.) If tightened too much,
the plunger in the suction tube will not work. (Fig. 5)
2) Connect the R1-1/2 inch at the hose inlet port of the suction hose
Fig. 4
assembly (option, product number 850126 ) to the suction port of the
pump. When this is done, wind commercially available sealing tape
around the male screw if the pump and screw it in.
3) Unplug the drum can (2B) and screw the bung adapter attached to the
suction hose assembly into an unplugged hole and insert the suction tube.
In the same manner as in 3.1-4), adjust a gap between the bottom of the
drum and the suction port of the suction tube.
<NOTE>
- The material hose used should have pressure resistance of 1 MPa or more
and be oil resistant. When an adequate hose is not available, place an
order with our dealer for a special purpose hose by the following
production number.

CAUTION Fig. 5

[Precaution for installation]

- Do not directly connect the piping to the pump. Direct
connection damages the piping by vibrations when
running the pump, causes noises, and in case of the drum
pump, makes it impossible to replace the drum can and
disables maintenance of the pump. (Fig. 6)

 Be sure to use a flexible hose to connect between the pump and

piping.

Fig. 6
2
 3.3 Connecting the ground wire

WARNING
- Make ground connection when working with flammable material or in explosive atmosphere. Rapid
pumping of material can result in static electrical charge. Also, be sure to provide proper ventilation
where a flammable atmosphere may exist.
1) When installing the pump, be sure to connect the ground wire at the specified position.
2) Also connect ground wires to peripheral equipment and piping.
3) Use 2.0 mm2 minimum ground wire.

Position for connecting

4. Air Connection The ground wire
1) Attach an air regulator (option) to the air supply port of the pump. A special purpose air regulator is optionally
provided for your use.
2) Connect an air hose from the air piping and connect to the IN side of the pump via the air regulator.

CAUTION
- In order to use the pump safely and enjoy a long service life, be sure to attach the air regulator to the air
supply port. (The air regulator consists of a reducing valve and pressure gauge.)
<NOTE>
- If the air has been supplied to the air hose, the pump will be activated the moment it is connected. Prior to
connecting the air hose to the pump, be sure to turn the knob of the air regulator in the counterclockwise direction.
- Use of the air regulator allows you to adjust a supply air pressure to the pump, improve operability by reducing
wasteful movements of the pump, thus prolonging the service life of the pump.
- The air pressure is increased by turning the knob in the clockwise direction and decreased by turning it in the
counterclockwise direction.

CAUTION
- The supply air pressure to the pump should be 0.7 MPa or less. Do not raise the pressure over 0.7
MPa in any case.

- If the air supplied to the pump is not shut off after completion of the work or at night, the hose may be
damaged or leak may occur on the valve or gun, thereby causing a secondary accident. This secondary
accident shall be attributable the user’s responsibility.
<NOTE>
- The distance for pressure feed differs depending on the viscosity, temperature, and required flow rate of oil.
Regarding details, please ask YAMADA CORPORATION or the dealer for further information.
- If the oil in the drum can has be exhausted, the pump is operated at a higher speed without oil and has an adverse
effect on its life. Stop the pump operation at once and replace the drum can with a new one. For replacing the drum
can, observe the item pertaining to “3.1 For the Drum Pump”.

5. Operating Method
1) Turn the knob of the air regulator in the clockwise direction to supply the air into the pump.
2) If the air is supplied, the pump will be activated for a while, fill the hose and gun with the oil, and stop.
3) The oil is discharged by operating the lever of the gun at the end of the material hose. Pulling the lever opens the
valve and automatically activates the pump to discharge the oil. Returning the lever closes the valve and stops a
discharge and the pump itself simultaneously.
4) Adjust the supply air pressure in accordance with the purpose of use. Normally, run the pump at the supply air
pressure of 0.3 - 0.5 MPa. When using the pump to feed-pressure the oil, a discharge rate differs depending on the
piping distance. Adjust the supply air pressure (up to 0.7 MPa) until your desired discharge rate is obtained.
<NOTE>
- When activation of the pump does not stop for a long period time, there may be a leak due to loose connection of
the hose, piping, gun, etc. or idling due to worm piston packing or valve seat inside the lower pump. Stop an air
supply and check.

3
6. Maintenance and Inspection
6.1 Troubleshooting and Corrective Measures
Symptom Contents of inspection Corrective measure
 The pump fails to start. - Whether or not the air is properly supplied. → Pressure check.
- Whether or not the valve halfway the piping is closed (0.3 - 0.7 MPa)
↓
(Remove the material hose from the outlet port on the
pump side and activate the pump.)
- If activated, the material hose, piping or plumbing is clogged
or an operating pressure is low.
- If not activated, the pump is out of order.
↓
(Separate the lower pump and activate only the air motor.)
- If activated, the lower pump is out of order. → Ask for service.
- If not activated, the air motor is out of order. → Ask for service.
 The pump fails to stop. - Whether or not there is a leak from the outlet valve (gun).
- Whether or not there is a leak from a joint of the piping,
material hose, etc.
- Whether or not the drum is running out of the oil. → Replenish or replace
↓
- The lower pump is out of order. → Ask for service.
 The pump is operated - Whether or not the drum is running out of the oil. → Replenish or replace
but does not feed the ↓
material by pressure. - The lower pump is out of order. → Ask for service.
 The pump is operated - Whether or not the supply air pressure has dropped. → Adjust the pressure.
but the pressure and ↓ (Up to 0.7 MPa)
flow rate are - The lower pump is out of order. → Ask for service.
insufficient. (Worn valve seat, clogging by dust)

6.2 Maintenance and Inspection

Cycle Maintenance and inspection
① Check the following operating conditions.
・Pump is running smoothly as usual.
Daily ・There is no air leak or liquid leak from pump parts or piping.
・Abnormal noise is not heard.
・There is no damage to pump parts or piping.
② Lubrication
・Lubricant oil: Turbine oil class 1 ISO VG32
・How to lubricate.
Weekly ≪Pump without a lubricator≫
・Disconnect pipe from air supply port and directly apply a few drops (0.5 mL) of lubricant.
≪Pump equipped with a lubricator≫
・Check the amount of oil in a lubricator and refill it.
※Be sure to shut off air supply before lubrication.
③ Check for loose joint parts.
Yearly ・Stop pump operation and shut off air supply. Then, check if any of threaded parts visible
from the outside from pump will not be loosened by hand.
④ Pump overhaul.
Pump should be overhauled triennially. Depending on use frequency or degree of abrasion,
Triennially ・
pump may need to be overhauled earlier.
・Contact our dealer or business office for overhauling.
[Inspection]
The packing and slide portion parts of the pump are worn away. Check and replace them once a year.

4
7. Disassembly and Assembly
 When the pump does not function properly or stop, do not hasten to disassemble it. Seeing “6. Maintenance and
Inspection”, scrutinize the condition and do not disassemble unnecessary parts.
 The air motor does not come into direct contact with the material and hardly goes out of order. You do not have to
disassemble it. If disassembly is required by any chance, contact our service shop.

CAUTION
- Gasoline is a high volatile fuel. Do not use it to clean the pump in any case, otherwise ignition or
explosion may be caused.
- When cleaning pump parts, do not use a liquid that may corrode aluminum, copper ally, iron, etc.

- Before disassembling and inspecting the machine, be sure to stop the supply air and open the outlet
valve to release the internal pressure of the pump.

[Disassembling the Air motor and Lower pump]

1) Disconnect an air connection from the pump, turn off an air supply to
the pump, and release the internal pressure of the pump.
2) Detach the air hose. If connected by piping, tighten a ball valve
between the piping and material hose to prevent counterflow of the oil,
and disconnect the material hose.
3) Draw out the pump from the drum can and drain the oil from inside the
pump.
4) The oil can be drained by pushing open the foot valve section inside, Fig. 7
using a screwdriver, etc. (Fig. 7)
5) Fix the pump body with a vise. (Fig. 8)

<NOTE>
- The cylinder made of aluminum alloy is vulnerable. Be sure to fix the main
body with the vise.

6) By using a pipe wrench on the knurled of the tube. Unscrew the outer
tube to take it off from the main body.
7) Remove an O ring from the plunger section, take out a pin, and pull out Fig. 8
a connecting rod. (Fig. 8)

[Disassembling the lower pump]

8) Pull out the piston valve from the suction tube.

<NOTE>
- Take care not to cause the oil remaining in the tube to flow on the floor.

9) Fix the connecting rod with the vice and unscrew a nut to remove the Fig. 9
valve body and valve seat. (Fig. 9)
10) Visually check the lip section of the packing inserted into the intake
valve and replace it if it is worn out or scratched. (Fig.10)
(When replacing the packing, make sure that the open end of the lip
faces upward.)
11) For assembling, reverse the disassembling procedure.
Fig.10

5
8. Parts Disassembly Drawing and Parts List
■ 852628 DR-50A1, 852629 SH-50A1
■ Parts List
Parts No.
No. Descriptions Q'ty
DR-50A1 SH-50A1
① 803483 Air motor 1
② 803485 803487 Lower pump 1
③ 803488 Bung adapter 1
④ 680743 Air plug 1

Parts No. Parts No.

No. Descriptions Q'ty No. Descriptions Q'ty
DR-50A1 SH-50A1 DR-50A1 SH-50A1
1 705194 Cap 1 13 710613 Plate 2
2 795092 Case housing 1 14 771364 Muffler 2
3 712906 Spring 1 15 630611 Retaining ring 1
4 712907 Spring 1 19 640021 O ring 1
5 832119 Spring case assembly 1 20 632581 Pin 1
6 803482 Piston assembly 1 21 712923 712926 Suction tube 1
6-1 712910 Valve 1 22 712922 712925 Connecting rod 1
6-2 795093 Piston 1 23 631210 Washer 1
6-3 640043 O ring 1 24 712918 Spring 1
6-4 685173 U packing 1 25 712919 Valve seat 1
6-5 712912 Valve plate 1 26 684081 Packing 1
6-6 712913 Snap pin 1 27 712920 Intake valve body 1
6-7 683011 U packing 1 28 683270 Nut 1
6-8 771960 Packing 1 29 803484 803486 Foot valve assembly 1
6-9 712915 Plunger 1 29-1 683502 Nut 1
7 712914 Air cylinder 1 29-2 705457 Valve plate 1
8 712916 Spring 1 29-3 703219 Spring 1
9 640135 O ring 2 29-4 712921 Bolt 1
10 771961 Spring holder 1 29-5 712924 712927 Adapter 1
11 685274 Packing 2 29-6 683440 O ring 1
12 712917 Body 1 30 686337 Tapping screw 1

6
 9. Pump specifications
■Engineering Data

TYPE DR-50A1 SH-50A1

ITEM No. 852628 852629
PUMP RATIO (NOMINAL) 1 x1
SUCTION PORT R 1-1/2
MATERIAL CONNECTION
DISCHARGE PORT Rc 3/4
AIR CONNECTION SUPPLY PORT Rc 1/4
OPERATING AIR PRESSURE 0.3 - 0.7 MPa
A-WEIGHTED SOUND
91 dB
PRESSURE LEVEL *1
MAXIMUM OPERATING NOISE
A-WEIGHTED SOUND
97 dB
POWER LEVEL *2
TEMP.AMBIENT 0 - 60 ℃
AMB. TEMP. RANGE
TEMP.MATERIAL 0 - 80 ℃
STROKE (NOMINAL) 70 mm
DISCHARGE VOLUME per CYCLE *3 126 mL
MAXIMUM DISCHARGE PRESSURE 0.7 MPa
WEIGHT 5.0 kg 2.6 kg
ACCESSORY 680743 Air plug (PS-20PM)
*1 Measurement method of A-weighted sound pressure level is based on ISO 1996.
*2 Measurement method of A-weighted sound power level is based on ISO 3744.
*3 Discharge volume (per cycle) varies according to use conditions.

■Performance Curve ■Dimensions

NOTE
The continuous pump operation should be avoided
if the desired delivery is in the range shaded in the
figure below.

ITEM No. A (mm) B (mm)

852628 1270 910
852629 561 201

7
10. Accessary for SH-50A1 (852629)

■Panel unit

No. Parts No. Descriptions Q’ty

1 801102 Delivery hose assembly 1
2 805062 Panel option 1
3 802558 Air regulator assembly 1
4 800400 Mounting bracket assembly 1

■Suction assembly (850126)

8
11. Limited Warranty
If an abnormality occurs during normal operation in accordance with the operating instructions and other operating
cautions within the warranty period (12 months after date of purchase) that can be attributed to a manufacturing
defect, the defective parts of this product will be serviced or the product will be replaced free of charge. However, this
warranty will not cover compensation for incidental damage or any malfunction listed below.

1. Warranty period
This warranty will be valid for a period of 12 months after the date of purchase.

2. Warranty
If, during the warranty period, any of the material of the genuine parts of this product or the workmanship of this
product is found defective, and is so verified by our company, the servicing cost will be fully born by our company.

3. Exclusion
Even during the warranty period, this warranty does not cover the following.
1) Malfunction arising from use of parts other than manufacturer-specified genuine parts
2) Malfunction arising from misuse or operating errors, or lack of storage or maintenance care
3) Malfunction arising from use with a fluid that may cause corrosion, inflation or dissolution of the component
parts of the product
4) Irregularity arising from repair made by other than by our firm, our regional office, dealer or authorized service
personnel
5) Malfunction arising from modification of the product by other than authorized service personnel
6) Wear and tear of parts that must be regularly replaced in the course of normal operation, such as packings,
O-rings and hose.
7) Malfunction and/or damage due to use with incorrect voltage.
8) Malfunction and/or damage due to transportation, moving or drop page of the product after purchase
9) Malfunction and/or damage due to fire, earthquake, flood or other force majeure
10) Malfunction arising from use of compressed air that contains impurities or excessive moisture, or use of
gases or fluids other than the specified compressed air
11) Malfunction arising from use of excessively abrasive material or of inadequate grease.
Furthermore, this warranty does not cover the rubber parts, or other parts used in this product and its accessories,
which are subject to wear in normal operation.
・hoses ・packings ・cords

4. Parts
Parts for this product will be kept available for 5 years after discontinuation of production. Once 5 years have
elapsed after close of production, availability of parts for this product cannot be guaranteed.

9
YAMADA CORPORATION
INTERNATIONAL DEPARTMENT
1-1-3, Minami-Magome,Ota ku, Tokyo, 143-8504, Japan
PHONE : +81-(0)3-3777-0241
FAX : +81-(0)3-3777-0584
E-mail : intl@yamadacorp.co.jp
Web : www.yamadacorp.co.jp

YAMADA (THAILAND) CO., LTD

41/79 Moo 6, Bangcha-long,Bangplee,Sumutprakarn10540,Thailand
PHONE : +66-(0)2-130-0990
FAX : +66-(0)2-130-0993
E-mail : sales@yamada-th.com

202101.2517 900409E