Secoh SLL-20 User manual

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
SERVICE MANUAL
SECOH AIR PUMPS
Models covered in this manual:
SLL-20, 30, 40 & 50
EL-60, 80-15, 80-17 & 100
EL-120W, 150 & 200

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
Contents
1. Prior to maintenance and Service
2. Maintenance
3. Air filter cleaning / replacement
4. Valve box and diaphragm replacement
5. Resetting auto stopper
6. Magnet replacement
7. Diagnosis of failures
8. Technical Specification
9. Test data (resistance table)
10. Spares Kits and replacement parts

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
•Always disconnect power supply before servicing.
Failure to do so could result in electrical shock,
personal injury or death.
•Do not touch live parts. Touching live parts will result in
electric shock.
1. Prior to maintenance and service
•Prior to maintenance and service, read and keep this manual
carefully.
•Follow the safety instructions!
•Servicing and maintenance as described in this manual should
be carried out by an authorised service facility.
2. Maintenance
Cleaning the air filter
The air filter must be cleaned every 3 to 4 months to insure correct
operation and replaced regularly.
Occasional checks
Is air blowing out properly?
Is the air pump making abnormal noise or vibrations?
Is the temperature of the air pump not abnormally high?
Is the power cord or plug damaged or discoloured?
ÎIf any irregularity is found, read DIAGNOSIS OF FAILURES.

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
3. Filter element cleaning or replacement
a) Undo the truss head screw of the
filter cover.
b) Remove the filter cover, by firmly
pulling it off.
c) Remove the filter element and
brush off any dust particles by
hand.
If heavily clogged with dust, wash
in a neutral detergent followed by a
thorough rinsing in water. Allow to
dry in the shade.
Note: Do not use benzene or thinner to
clean filter element as it can be
damaged!
d) After cleaning reassemble the filter
element back in place. Make sure
to put the harder side of the filter
facing downwards. Press in the
filter cover.
e) Secure the filter cover by the truss
head screw.

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
4. Valve box and diaphragm replacement
a) Undo the 4 corner bolts of the overall
cover.
b) Remove the overall cover. If it is
hard to remove, insert a screwdriver
in the slot provided.
c) Pull out the bushing.
d) Remove the shock absorber
e) Undo the 4 screws of the holder
cover.
Note:
It is easier to change one diaphragm at a
time.
f) Insert the magnet support jig in the 4
corners, between the magnet and the
core.
Note: The magnet support jig (carton
strips) is included in the service repair
kit.

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
g) Undo the 4 screws of the valve box.
h) Slide down the hose
clamp, pull off the
connecting pipe and
remove the valve
box.
i) Undo the nut or bolt and remove the
diaphragm (Nut: SLL series & EL-60, 80-15
& 120W - Bolt: EL-80-17, 100, 150 & 200).
j) Set the new diaphragm and fix it by
the nut or bolt (torque, see table at
appendix).
k) Insert the magnet supporter jig in
the 4 corners between the
magnet and the core.
Note: Make sure that the magnet is in the
centre of the solenoids.

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
l) Install the new valve box and secure
into position using the 4 corner
screws.
m) Replace opposite diaphragm following
the above procedure.
n) Pull out the magnet support jig.
o) Check the magnet is in a central
position.
Note: The tolerance of the centring of the
magnet is within +/- 0.5 mm (see
dimension “d” of sketch in appendix).
p) Push on the connecting pipe and refit
the hose clamp.
q) Reset the auto stopper (If necessary)
r) Connect power cord to confirm proper
operation.
Danger: Do not touch live parts. Touching live
parts will result in electric shock!
s) Fasten the holder cover with the
screws.

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
t) Put the shock absorber back into
place.
u) Insert the power cord bushing into
the location notch.
Note: It locates into the inner slot!
v) Replace the overall cover and secure
by using the nuts and bolts.
w) Replace air filter as previously
described.
Secure filter cover using the truss head
screw.

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
5. Reset auto stopper (protective switch)
Function of auto stopper
A running pump with a broken
diaphragm may cause a major break
down and excessive repair cost. To
prevent this from occurring, EL-
series pumps are equipped with a
protective switch.
If the diaphragm is broken, the
magnet reciprocates with abnormal
amplitude and the projection of the
magnet hits the slider of the auto
stopper. The contact is interrupted
and power is cut off.
Auto stopper reset
a) Follow the procedure of chapter 4 from a)
to e)
b) Set the slider at the position L1 = L2.
c) Follow the procedure of section 4 from
point r) to point w).

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
6. Magnet replacement
a) Follow the procedure of section 4 from a) to i).
b) Remove diaphragm and pull out opposite
diaphragm and magnet from other side.
c) Assemble new magnet and
diaphragm with nut or bolt.
d) Insert the diaphragm and the magnet
between the solenoids. The projection should
be upward.
e) Install replacement diaphragm to
opposite side.
f) Follow the procedure of chapter 4
from k) to w).
7. Diagnosis of Failures

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
Problem Cause Action
Pump does not work Power plug is disconnected Plug in and check if electricity is
available
Cord is broken (Internal wiring
damaged) Check electrical continuity with circuit tester
Auto stopper activated Open cover to check for damage
on diaphragm
Excessive noise Valves or diaphragm are
damaged Open cover to check for damage or disconnection
L-Tube is damaged or
disconnected Re-connect or replace L-Tube
Pump is in touch with
surrounding articles. Re-position pump
Discharged air volume
decreases Air filter is clogged Clean or replace air filter
Air diffuser or pipe is clogged Clean air diffuser and check
piping
Abnormal temperature arises Air filter is clogged Clean or replace air filter
Air diffuser or pipe is clogged Un-block air diffuser or pipe
Pump sometimes operates and
sometimes not. * Air filter is or diffuser is clogged Clean or replace air filter or diffuser
*A decrease in airflow (caused by clogged air filter or air diffuser) may lead to
an extraordinary rise in operating temperature. This will activate a thermal
protector and stop the pump. When the temperature reduces, the pump will
automatically restart.
If in doubt about any service or maintenance procedures, please call
partsandpumps.co.uk

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
8. Technical Specifications
Model
SLL-20 SLL-30 SLL-40 SLL-50
Voltage V As shown in the name plate
Frequency Hz Applied to 50
Optimal Press. bar 0.2 0.2
Open Flow L/min 52 60 68 75
Max Power W As shown in the name plate
Outlet dia. mm OD 19 mm
Weight kg 4.5
Standard accessories L-Joint hose (with hose band)
Model
EL-60 EL-80-15 EL-80-17 EL-100
Voltage V As shown in the name plate
Frequency Hz Applied to 50
Optimal Press. bar 0.2 0.2 0.2 0.2
Open Flow L/min 105 115 120 145
Max Power W As shown in the name plate
Outlet dia. mm OD 19 mm
Weight kg 8.5
Standard accessories L-Joint hose (with hose band)
Model
EL-120W EL-150 EL-200
Voltage V As shown in the name plate
Frequency Hz Applied to 50
Optimal Press. bar 0.25
Open Flow L/min 225 265 310
Max Power W As shown in the name plate
Outlet dia. mm OD 27 mm
Weight kg 16
Standard accessories L-Joint hose (with hose band)

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
9. Testing Data
a) Solenoid resistance table
Voltage: 230V, 50Hz
Tolerance: +/- 10%
SLL-20 & 30 models: Solenoids are in series connection
Other models: Solenoids are in parallel connection
Total R Single R
SLL-40 86.5 173.0
SLL-50 60.8 121.7
EL-60 36.7 73.4
EL-80-15 21.9 43.7
EL-80-17 33.1 66.2
EL-100 20.0 40.0
EL-120W 16.2 64.7
EL-150 16.6 66.2
EL-200 10.0 40.0
10. Spare Part Kits
Only use genuine SECOH replacement parts. Non-standard parts will have a
detrimental effect on overall pump life and performance.
In order to ensure long service and operation, it is recommended diaphragms
and valve boxes are replaced once a year.
All parts; magnets, filters, service kits and diaphragms are available from
www.partsandpumps.co.uk online site and can be despatched immediately.
We also stock a complete range of Secoh pumps for replacement purposes
and these can also be used to replace defective pumps of other brands with
ease.

©2007 Parts and Pumps, all rights reserved. No liability is accepted for incorrect application or faulty installation by end user.
www.partsandpumps.co.uk
S L L S E R I E S
Contents Required kit
Qty
Kit Name Part No.
Code Parts
included Qty Pos
No SLL20 SLL30 SLL40 SLL50
Diaphragm 2 10
Diaphragm
holder 2 9
Nut 2 24
Valve box &
valve 2 11
Filter element 1 3
Filter cover
packing 1 2
Diaphragm
repair kit K-SLL-D EM-0359025
Tank base
packing 1 17
1 1 1 1
Magnet 1 8
Magnet K-SLL-M
EM-0351008 Nut 2 24
1 1 1 1
E L S E R I E S
Contents Required kit
Qty
Kit name Part No.
Code Parts
included Qty Pos
No EL60
EL80-15 EL80-17 EL100 EL120W EL150 EL200
Diaphragm 2 11
Diaphragm
holder 2 10
Nut 2 23
Valve box &
valve 2 12
Diaphragm
repair kit K-EL-D EM-0377007
Filter element 1 2
1 1 2 2
Magnet 1 9
K-EL60,80-15-M
EM-0374008 Nut 2 23
1 2
Magnet 1 9
Magnet K-EL80-17,100-M
EM-0405000 Screw 2 23
1 2
S-EL60,80-15,120W
EM-0433004 Auto stopper 1 6 1 2
Auto stopper S-EL80-17,150,200
EM-0434000 Auto stopper 1 6 1 2