Dover Wilden Original Series Instruction Manual

EOM
Simplify your process
Engineering
Operation &
Maintenance
Original™Series METAL Pumps
T8/A8
WIL-10270-E-02
REPLACES WIL-10270-E-01

TABLE OF CONTENTS
PAGE #
SECTION 1 — CAUTIONS ............................................................................................ 1
SECTION 2 — PUMP DESIGNATION SYSTEM ......................................... 2
SECTION 3 — HOW IT WORKS (PUMP & AIR SYSTEMS) ............ 3
SECTION 4 — DIMENSIONAL DRAWINGS
A. T8 METAL Air-Controlled ................................................................................................... 4
B. A8 METAL Accu-Flo™....................................................................................................... 4
C. T8 METAL SANIFLOFDA Air-Operated................................................................................. 5
D. T8 METAL Stallion.............................................................................................................. 5
SECTION 5 — PERFORMANCE CURVES
A. T8 METAL Rubber-Fitted ................................................................................................... 6
B. T8 METAL Ultra-Flex™-Fitted............................................................................................ 6
C. T8 METAL TPE-Fitted ........................................................................................................ 7
D. T8 METAL PTFE-Fitted ...................................................................................................... 7
E. A8 METAL Accu-Flo™ Rubber/TPE-Fitted........................................................................ 8
F. A8 METAL Accu-Flo™ Rubber/TPE-Fitted 70/30 Operating Condition............................ 8
G. A8 METAL Accu-Flo™ Ultra-Flex™/PTFE-Fitted .............................................................. 9
H. A8 METAL Accu-Flo™ Ultra-Flex™/PTFE-Fitted 70/30 Operating Condition .................. 9
I. T8 METAL Stallion Ultra-Flex™-Fitted............................................................................... 10
J. T8 METAL Stallion TPE-Fitted ........................................................................................... 10
SECTION 6 — SUCTION LIFT CURVES & DATA
A. Air-Controlled .................................................................................................................... 11
B. Accu-Flo™ .................................................................................................................... 11
SECTION 7 — INSTALLATION & OPERATION
A. Installation Air-Controlled................................................................................................... 12
B. Air-Controlled Operation and Maintenance....................................................................... 13
C. Accu-Flo™ Operating Principles ....................................................................................... 14
D. Installation Accu-Flo™....................................................................................................... 14
E. Accu-Flo™ Operation and Maintenance........................................................................... 15
F. Troubleshooting Air-Controlled Pumps.............................................................................. 16
G. Troubleshooting Accu-Flo™ Pumps.................................................................................. 16
SECTION 8 — DIRECTIONS FOR DISASSEMBLY/REASSEMBLY
A. Turbo-Flo™ Air Valve/Center Section – Disassembly, Cleaning, Inspection..................... 17
B. Turbo-Flo™ Air Valve/Center Section – Disassembly ...................................................... 20
C. Reassembly Hints & Tips................................................................................................... 22
D. PTFE Gasket Kit Installation .............................................................................................. 22
SECTION 9 — EXPLODED VIEW/PARTS LISTING
A. T8 METAL .................................................................................................................... 24
B. T8 METAL PTFE-Fitted ...................................................................................................... 28
C. A8 METAL Accu-Flo™....................................................................................................... 30
SECTION 10 — REFERENCE
A. Air-Controlled Elastomer Options...................................................................................... 32
B. Stallion Elastomer Options ................................................................................................ 32
C. Accu-Flo™ Electrical Information...................................................................................... 33
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U.S.CleanAirAct
Amendments of 1990

1WILDEN PUMP & ENGINEERING, LLCWIL-10270-E-02
SECTION 1
T8 METAL
CAUTIONS – READ FIRST!
TEMPERATURE LIMITS:
Neoprene –17.8°C to 93.3°C 0°F to 200°F
Buna-N –12.2°C to 82.2°C 10°F to 180°F
EPDM –51.1°C to 137.8°C –60°F to 280°F
Viton
®
–40°C to 176.7°C –40°F to 350°F
Wil-Flex™ –40°C to 107.2°C –40°F to 225°F
Polyurethane 12.2°C to 65.6°C 10°F to 150°F
Saniflex™ –28.9°C to 104.4°C –20°F to 220°F
PTFE 4.4°C to 104.4°C 40°F to 220°F
Tetra-Flex™PTFE 4.4°C to 107.2°C 40°F to 225°F
Fluoro-Seal™ –40°C to 232°C –40°F to 450°F
CAUTION: When choosing pump materials, be sure
to check the temperature limits for all wetted compo-
nents. Example: Viton
®
has a maximum limit of 176.7°C
(350°F) but polypropylene has a maximum limit of only
79°C (175°F).
CAUTION: Maximum temperature limits are based
upon mechanical stress only. Certain chemicals will
significantly reduce maximum safe operating tempera-
tures. Consult engineering guide for chemical compat-
ibility and temperature limits.
CAUTION: Always wear safety glasses when operat-
ing pump. When diaphragm rupture occurs, material
being pumped may be forced out air exhaust.
WARNING: Prevention of static sparking — If static
sparking occurs, fire or explosion could result. Pump,
valves,andcontainersmustbeproperlygroundedwhen
handling flammable fluids and whenever discharge of
static electricity is a hazard.
CAUTION: Do not exceed 8.6 bar (125 psig) air supply
pressure. (3.4 bar [50 psig] on UL models.)
CAUTION: Before any maintenance or repair is
attempted, the compressed air line to the pump should
be disconnected and all air pressure allowed to bleed
from pump. Disconnect all intake, discharge and air
lines. Drain the pump by turning it upside down and
allowing any fluid to flow into a suitable container.
CAUTION: Blow out air line for 10 to 20 seconds
before attaching to pump to make sure all pipe line
debris is clear. Use an in-line air filter. A 5µ (micron) air
filter is recommended.
NOTE: When installing PTFE diaphragms, it is impor-
tant to tighten outer pistons simultaneously (turning in
opposite directions) to ensure tight fit.
WARNING: Tighten all clamp bands and retainers prior to
installation. Fittings may loosen during transportation.
NOTE: Before starting disassembly, mark a line from each
liquid chamber to its corresponding air chamber. This line
will assist in proper alignment during reassembly.
CAUTION: Verify the chemical compatibility of the
process and cleaning fluid to the pump’s component
materials in the Chemical Resistance Guide (see E4).
CAUTION: When removing the end cap using
compressed air, the air valve end cap may come out with
considerable force. Hand protection such as a padded
glove or rag should be used to capture the end cap.
NOTE: All non lube-free air-operated pumps must be
lubricated. Wilden suggests an arctic 5 weight oil (ISO
grade 15). Do not over-lubricate pump. Over-lubrica-
tion will reduce pump performance.
NOTE: UL-listed pumps must not exceed 3.4-bar
(50 psig) air supply pressure.
CAUTION: Only explosion proof (NEMA 7) solenoid
valves should be used in areas where explosion proof
equipment is required.

2
WILDEN PUMP & ENGINEERING, LLC WIL-10270-E-02
SECTION 2
WILDEN PUMP DESIGNATION SYSTEM
T8 OR A8 METAL MATERIAL CODES
SPECIALTY CODES
AIR SYSTEM BASE TYPE
T = TURBO-FLO™
WETTED PARTS & OUTER PISTON
AA = ALUMINUM / ALUMINUM
HH = ALLOY C / ALLOY C
SS = STAINLESS STEEL /
STAINLESS STEEL
WW = CAST IRON / CAST IRON
AIR CHAMBERS
A = ALUMINUM
C = PTFE COATED ALUMINUM
N = NICKEL PLATED ALUMINUM
S = STAINLESS STEEL
W = CAST IRON
CENTER BLOCK
A = ALUMINUM
C = PTFE COATED ALUMINUM
N = NICKEL PLATED ALUMINUM
P = POLYPROPYLENE
S = STAINLESS STEEL
AIR VALVE
B = BRASS
C = PTFE COATED
D = BRASS W/OIL BOTTLE
N = NICKEL PLATED BRASS
S = STAINLESS STEEL
DIAPHRAGMS
BNS = BUNA-N (Red Dot)
BNU = BUNA-N, ULTRA-FLEX™
EPS = EPDM (Blue Dot)
EPU = EPDM, ULTRA-FLEX™
FSS = SANIFLEX™
[Hytrel®(Cream)]
NES = NEOPRENE (Green Dot)
NEU = NEOPRENE, ULTRA-FLEX™
PUS = POLYURETHANE (Clear)
TEU = PTFE W/EPDM
BACK-UP (White)
TNU = PTFE W/NEOPRENE
BACK-UP (White)
TSU = PTFE W/SANIFLEX™ BACK-UP (White)
VTS = VITON®(White Dot)
VTU = VITON®, ULTRA-FLEX™
WFS = WIL-FLEX™ [Santoprene®
(Orange Dot)]
XBS = CONDUCTIVE BUNA-N (Two Red Dots)
VALVE BALL
BN = BUNA-N (Red Dot)
FS = SANIFLEX™
[Hytrel® (Cream)]
FV = SANITARY VITON®
(Two White Dots)
EP = EPDM (Blue Dot)
NE = NEOPRENE (Green Dot)
PU = POLYURETHANE (Brown)
TF = PTFE (White)
VT = VITON®(White Dot)
WF = WIL-FLEX™ [Santoprene®(Orange Dot)]
VALVE SEAT
A = ALUMINUM*
BN = BUNA-N (Red Dot)
EP = EPDM (Blue Dot)
FS = SANIFLEX™
[Hytrel® (Cream)]
H = ALLOY C*
M = MILD STEEL*
NE = NEOPRENE (Green Dot)
PU = POLYURETHANE (Clear)
S = STAINLESS STEEL*
VT = VITON®(White Dot)
WF = WIL-FLEX™ [Santoprene®(Orange Dot)]
*Valve seat o-ring required.
VALVE SEAT O-RING
FS = FLUORO-SEAL™
TF = PTFE (White)
0003 Spark free
0010 SS outer piston, spark free
0014 BSPT
0015 Spark free, BSPT
0023 Wing nuts
0030 Screen based
0033 Screen based, spark free
0036 Screen based, BSPT
0037 Screen based, spark free, BSPT
0039 Screen based, polyurethane screen
0044 Stallion®, balls & seats ONLY
0045 Stallion®, shaft & bumpers ONLY
0046 Stallion®, internals, BSPT
0048 Stallion®, internals
0049 Stallion®, aluminum screen base
0050 Stallion®
0051 Stallion®, BSPT
0052 Stallion®, spark free
0053 Stallion®, footed, BSPT
0054 Stallion®, footed
0055 Stallion®, spark free, BSPT
0070 Saniflo™ FDA
0071 Saniflo™ FDA, with stand
0072 Saniflo™ USDA
0074 Saniflo™ USDA, with stand
0076 Saniflo™ FDA, Stallion®internals
0079 Tri-clamp fittings, wing nuts
0080 Tri-clamp fittings ONLY
0082 Saniflo™, with 2-1/2" balls
0090 UL listed
0091 UL listed, Wil-Gard II™ 110V
0092 UL listed, screen based
0100 Wil-Gard II™ 110V
0102 Wil-Gard II™, sensor wires ONLY
0103 Wil-Gard II™ 220V
0104 Wil-Gard II™ 110V, spark free
0105 Wil-Gard II™ 220V, spark free
0108 Wil-Gard II™ 220V, BSPT
0109 Wil-Gard II™ 220V, spark free, BSPT
0112 Stallion®, footed, spark free, without handles
0113 Stallion®, internals, spark free, BSPT
0115 Stallion®, footed, spark free, BSPT, without handles
0116 Stallion®, BSPT, without handles
0117 Stallion®, footed, BSPT, without handles
0119 Saniflo™ USDA, 2-1/2" balls, stand
0120 Saniflo™ FDA, Wil-Gard II™ 110V
0121 Saniflo™ FDA, Wil-Gard II™ 110V, stand
0124 Saniflo™, Accu-Flo™, 24V DC coil, international,
PTB approved
0125 Saniflo™, Accu-Flo™, 24V DC coil
0126 Saniflo™, Accu-Flo™, 24V DC x-proof coil
0127 Saniflo™, Accu-Flo™, 110V AC coil
0128 Saniflo™, Accu-Flo™, 24V AC / 12V DC coil
0129 Saniflo™, Accu-Flo™, 24V AC / 12V DC x-proof coil
0130 Saniflo™, Accu-Flo™, 110V AC x-proof coil
0143 Accu-Flo™, 110V AC x-proof coil, BSPT
0144 Accu-Flo™, 110V AC coil, BSPT
0145 Accu-Flo™, 110V AC x-proof coil, Wil-Gard II™ 110V
0147 Accu-Flo™, 24V DC coil, spark free, BSPT
0148 Accu-Flo™, valve body ONLY, no coil, BSPT
0
149 Accu-Flo™, x-proof valve body ONLY, no coil, BSPT
0
150 Accu-Flo™, 24V DC coil
0151 Accu-Flo™, 24V AC / 12V DC coil
0153 Accu-Flo™, 24V AC / 12V DC x-proof coil
0154 Accu-Flo™, 24V DC x-proof coil
0155 Accu-Flo™, 110V AC coil
0156 Accu-Flo™, 110V AC x-proof coil
0157 Accu-Flo™, 24V DC coil, Intl., PTB approved
0158 Accu-Flo™, 24V DC coil, Intl., PTB approved, BSPT
0160 Accu-Flo™, 24V DC coil, BSPT
0161 Accu-Flo™, 24V DC x-proof coil, BSPT
0162 Accu-Flo™, 24V AC / 12V DC coil, BSPT
0164 Accu-Flo™, 110V AC coil, Wil-Gard II™ sensor wires ONLY
0167 Accu-Flo™ 24V AC / 12V DC coil, Wil-Gard II™ 110V
0168 Accu-Flo™, 110V AC coil, Wil-Gard II™ 110V
0
183 Accu-Flo™, 24V AC / 12V DC x-proof coil, Wil-Gard II™ 110V
0
194 Accu-Flo™, 24V DC coil, spark free
0195 Accu-Flo™, 24V DC x-proof coil, spark free
0196 Accu-Flo™, 24V AC / 12V DC coil, spark free
0197 Accu-Flo™, 24V AC / 12V DC x-proof coil, spark free
0198 Accu-Flo™, 110V AC coil, spark free
0199 Accu-Flo™, 110V AC x-proof coil, spark free
0231 Stallion®, externals (screen & handles)
0233 Stallion®, externals (screen & handles), BSPT
0300 No air valve
0330 Wing nuts, BSPT
0360 Accu-Flo™, 24V DC coil, DIN flange
0361 Bolted, Accu-Flo™, 24V DC coil
0363 Accu-Flo™, 110V AC coil,
Stallion®internals (balls & seats ONLY)
0370 Bolted, Accu-Flo™, 24V DC coil
0371 Bolted, Accu-Flo™, 24V AC / 12V DC coil
0372 Bolted, Accu-Flo™, 24V AC / 12V DC x-proof coil
0373 Bolted, Accu-Flo™, 24V DC x-proof coil
0374 Bolted, Accu-Flo™, 110V AC coil
0375 Bolted, Accu-Flo™, 110V AC x-proof coil
0376 Bolted Accu-Flo™, 24V DC, Intl., PTB approved
0504 DIN flange
0513 SS outer pistons
Viton®is a registered trademark of DuPont Dow Elastomers.
T8orA8X/XXXXX/XXX/XX/XXX/ XXXX
O-RINGS
MODEL VALVE SEAT
VALVE BALLS
DIAPHRAGMS
AIR VALVE
CENTER BLOCK
AIR CHAMBERS
WETTED PARTS & OUTER PISTON
AIR SYSTEM BASE TYPE
SPECIALTY
CODE
(if applicable)

3WILDEN PUMP & ENGINEERING, LLCWIL-10270-E-02
SECTION 3
THE WILDEN PUMP — HOW IT WORKS
The Wilden diaphragm pump is an air-operated, positive displacement, self-priming pump. These drawings show the flow
pattern through the pump upon its initial stroke. It is assumed the pump has no fluid in it prior to its initial stroke.
FIGURE 1 The air valve directs pres-
surized air to the back side of diaphragm
A. The compressed air is applied directly
to the liquid column separated by elas-
tomeric diaphragms. The diaphragm
acts as a separation membrane between
the compressed air and liquid, balanc-
ing the load and removing mechani-
cal stress from the diaphragm. The
compressed air moves the diaphragm
away from the center block of the pump.
The opposite diaphragm is pulled in by
the shaft connected to the pressur-
ized diaphragm. Diaphragm B is on its
suction stroke; air behind the diaphragm
has been forced out to the atmosphere
through the exhaust port of the pump.
The movement of diaphragm B toward
the center block of the pump creates a
vacuum within chamber B. Atmospheric
pressure forces fluid into the inlet mani-
fold forcing the inlet valve ball off its
seat. Liquid is free to move past the inlet
valve ball and fill the liquid chamber (see
shaded area).
FIGURE 2 When the pressurized
diaphragm, diaphragm A, reaches the
limit of its discharge stroke, the air valve
redirects pressurized air to the back
side of diaphragm B. The pressurized
air forces diaphragm B away from the
center block while pulling diaphragm A
to the center block. Diaphragm B is now
on its discharge stroke. Diaphragm B
forces the inlet valve ball onto its seat
due to the hydraulic forces developed
in the liquid chamber and manifold of
the pump. These same hydraulic forces
lift the discharge valve ball off its seat,
while the opposite discharge valve ball is
forced onto its seat, forcing fluid to flow
through the pump discharge. The move-
ment of diaphragm A toward the center
block of the pump creates a vacuum
within liquid chamber A. Atmospheric
pressure forces fluid into the inlet mani-
fold of the pump. The inlet valve ball
is forced off its seat allowing the fluid
being pumped to fill the liquid chamber.
FIGURE 3 At completion of the stroke,
the air valve again redirects air to the
back side of diaphragm A, which starts
diaphragm B on its exhaust stroke. As
the pump reaches its original starting
point, each diaphragm has gone through
one exhaust and one discharge stroke.
This constitutes one complete pump-
ing cycle. The pump may take several
cycles to completely prime depending
on the conditions of the application.
LEFT STROKE
➤
➤
RIGHT STROKE MID STROKE

4
WILDEN PUMP & ENGINEERING, LLC WIL-10270-E-02
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SECTION 4A
DIMENSIONAL DRAWING
T8 METAL
SECTION 4B
DIMENSIONAL DRAWING
A8 METAL ACCU-FLO™
51 mm (2”) FNPT DISCHARGE
51 mm (2”) FNPT DISCHARGE
51 mm (2”) FNPT INLET
51 mm (2”) FNPT INLET
51 mm
(2”) FNPT INLET
ALUMINUM BASE SCREEN MODEL
51 mm
(2”) FNPT
51 mm (2”) FNPT
FOOTED BASE FOR 316 S.S. MODELS
FOOTED BASE FOR 316 S.S. &
ALLOY C MODELS
19 mm (3/4”)
FNPT AIR
INLET
19 mm (3/4”)
FNPT AIR
INLET
19 mm
(3/4”) FNPT
AIR EXHAUST
19 mm (3/4”)
FNPT AIR
EXHAUST
G - ALUM.
F - 316 S.S., C.I.
G - ALUM.
F - 316 S.S., C.I., ALLOY C
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 404 15.9
B 48 1.9
C 630 24.8
D 668 26.3
E 361 14.2
F 58 2.3
G 61 2.4
H 272 10.7
J 343 13.5
K 229 9.0
L 254 10.0
M 257 10.1
N 312 12.3
P 15 0.6
R 64 2.5
S 51 2.0
T 282 11.1
U 71 2.8
V 282 11.1
W 386 15.2
X Ø15 Ø0.6
BSP threads available.
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 404 15.9
B 48 1.9
C 335 13.2
D 630 24.8
E 668 26.3
F 58 2.3
G 61 2.4
H 272 10.7
J 86 3.4
K 343 13.5
L 229 9.0
M 254 10.0
N 257 10.1
P 312 12.3
R 15 0.6
S 64 2.5
BSP threads available.

5WILDEN PUMP & ENGINEERING, LLCWIL-10270-E-02
D
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Interior/Exterior Food Processing finish is 50 GRIT.
Accu-Flo™ model available.
A
B
CD
E
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SECTION 4C
DIMENSIONAL DRAWING
T8 METAL SANIFLO
FDA
SECTION 4D
DIMENSIONAL DRAWING
T8 METAL STALLION
64 mm (2-1/2”)
TRI-CLAMP
64 mm (2-1/2”) TRI-CLAMP
19 mm
(3/4”) FNPT
AIR INLET
19 mm (3/4”)
FNPT EXHAUST
51 mm
(2”) FNPT
DISCHARGE
51 mm (2”) FNPT INLET
19 mm (3/4”)
FNPT AIR INLET 19 mm
(3/4”) FNPT
EXHAUST
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 435 17.1
B 64 2.5
C 625 24.6
D 666 26.2
E 368 14.5
F 76 3.0
G 264 10.4
H 345 13.6
J 305 12.0
K 254 10.0
L 229 9.0
M 254 10.0
N 15 0.6
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 409 16.1
B 46 1.8
C 625 24.6
D 666 26.2
E 610 24.0
F 376 14.8
G 61 2.4
H 264 10.4
J 345 13.6
K 282 11.1
L 279 11.0
M Ø15 Ø0.6
BSP threads available

6
WILDEN PUMP & ENGINEERING, LLC WIL-10270-E-02
Height..................................668 mm (26.3")
Width...................................404 mm (15.9")
Depth ..................................343 mm (13.5")
Est. Ship Weight..........
Aluminum 33 kg (72 lbs)
Cast Iron 52 kg (114 lbs)
316 Stainless Steel 48 kg (106 lbs)
Air Inlet....................................19 mm (3/4")
Inlet............................................51 mm (2")
Outlet .........................................51 mm (2")
Suction Lift........................... 6.4 m Dry (21')
9.5 m Wet (31')
Displacement/Stroke ....... 2.69 l (0.71 gal.)1
Max. Flow Rate...............617 lpm (163 gpm)
Max. Size Solids.....................6.4 mm (1/4")
1Displacement per stroke was calculated at 4.8 bar
(70 psig) air inlet pressure against a 2 bar (30 psig)
head pressure.
Example: To pump 318 lpm (84 gpm) against
adischargepressureheadof2.1 bar (30 psig)
requires 4.1 bar (60 psig) and 85 Nm3/h (50
scfm) air consumption. (See dot on chart.)
Caution: Do not exceed 8.6 bar (125 psig) air
supply pressure. Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation parameters
will fall in the center of the pump performance curve.
[LPM]
Water Discharge Flow Rates
Height..................................668 mm (26.3")
Width...................................404 mm (15.9")
Depth ..................................343 mm (13.5")
Est. Ship Weight..........
Aluminum 33 kg (72 lbs)
Cast Iron 52 kg (114 lbs)
316 Stainless Steel 48 kg (106 lbs)
Air Inlet....................................19 mm (3/4")
Inlet............................................51 mm (2")
Outlet .........................................51 mm (2")
Suction Lift........................... 4.6 m Dry (15')
9.5 m Wet (31')
Displacement/Stroke ....... 1.82 l (0.48 gal.)1
Max. Flow Rate...............575 lpm (152 gpm)
Max. Size Solids.....................6.4 mm (1/4")
1Displacement per stroke was calculated at 4.8 bar
(70 psig) air inlet pressure against a 2 bar (30 psig)
head pressure.
Example: To pump 303 lpm (80 gpm) against
adischargepressureheadof2.1 bar (30 psig)
requires 4.1 bar (60 psig) and 97 Nm3/h (58
scfm) air consumption. (See dot on chart.)
Caution: Do not exceed 8.6 bar (125 psig) air
supply pressure. Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation parameters
will fall in the center of the pump performance curve.
[LPM]
Water Discharge Flow Rates
SECTION 5A
PERFORMANCE CURVES
T8 METAL RUBBER-FITTED
SECTION 5B
PERFORMANCE CURVES
T8 METAL ULTRA-FLEX™-FITTED

7WILDEN PUMP & ENGINEERING, LLCWIL-10270-E-02
Height..................................668 mm (26.3")
Width...................................404 mm (15.9")
Depth ..................................343 mm (13.5")
Est. Ship Weight..........
Aluminum 33 kg (72 lbs)
Cast Iron 52 kg (114 lbs)
316 Stainless Steel 48 kg (106 lbs)
Air Inlet....................................19 mm (3/4")
Inlet............................................51 mm (2")
Outlet .........................................51 mm (2")
Suction Lift........................... 6.1 m Dry (20')
9.5 m Wet (31')
Displacement/Stroke ....... 2.80 l (0.74 gal.)1
Max. Flow Rate...............613 lpm (162 gpm)
Max. Size Solids.....................6.4 mm (1/4")
1Displacement per stroke was calculated at 4.8 bar
(70 psig) air inlet pressure against a 2 bar (30 psig)
head pressure.
Example: To pump 341 lpm (90 gpm) against
adischargepressureheadof2.1 bar (30 psig)
requires 4.1 bar (60 psig) and 85 Nm3/h (50
scfm) air consumption. (See dot on chart.)
Caution: Do not exceed 8.6 bar (125 psig) air
supply pressure. Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation parameters
will fall in the center of the pump performance curve.
[LPM]
Water Discharge Flow Rates
Height..................................668 mm (26.3")
Width...................................404 mm (15.9")
Depth ..................................343 mm (13.5")
Est. Ship Weight..........
Aluminum 33 kg (72 lbs)
Cast Iron 52 kg (114 lbs)
316 Stainless Steel 48 kg (106 lbs)
Air Inlet....................................19 mm (3/4")
Inlet............................................51 mm (2")
Outlet .........................................51 mm (2")
Suction Lift........................... 3.7 m Dry (12')
9.5 m Wet (31')
Displacement/Stroke ....... 1.51 l (0.40 gal.)1
Max. Flow Rate...............534 lpm (141 gpm)
Max. Size Solids.....................6.4 mm (1/4")
1Displacement per stroke was calculated at 4.8 bar
(70 psig) air inlet pressure against a 2 bar (30 psig)
head pressure.
Example: To pump 284 lpm (75 gpm) against
adischargepressureheadof2.1 bar (30 psig)
requires 4.1 bar (60 psig) and 102 Nm3h (60
scfm) air consumption. (See dot on chart.)
Caution: Do not exceed 8.6 bar (125 psig) air
supply pressure. Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation parameters
will fall in the center of the pump performance curve.
[LPM]
Water Discharge Flow Rates
SECTION 5C
PERFORMANCE CURVES
T8 METAL TPE-FITTED
SECTION 5D
PERFORMANCE CURVES
T8 METAL PTFE-FITTED

8
WILDEN PUMP & ENGINEERING, LLC WIL-10270-E-02
Height..................................668 mm (26.3")
Width...................................404 mm (15.9")
Depth ..................................343 mm (13.5")
Est. Ship Weight..........
Aluminum 32 kg (70 lbs)
Cast Iron 51 kg (112 lbs)
316 Stainless Steel 47 kg (104 lbs)
Alloy C 52 kg (114 lbs)
Air Inlet....................................19 mm (3/4")
Inlet............................................51 mm (2")
Outlet .........................................51 mm (2")
Suction Lift........................... 6.1 m Dry (20')
8.53 m Wet (28')
Displacement/Stroke ....... 2.08 l (0.55 gal.)1
Max. Flow Rate...............420 lpm (111 gpm)
Max. Size Solids.....................6.4 mm (1/4")
1Displacement per stroke was calculated at 4.8 bar
(70 psig) air inlet pressure against a 2 bar (30 psig)
head pressure.
Example: To pump 197 lpm (52 gpm) against
adischarge pressurehead of2.7bar (40 psig)
requires 5.5 bar (80 psig), 68 Nm3/h (40 scfm)
air consumption, and a pump speed of 108
strokes/minute. (See dot on chart.)
Caution: Do not exceed 8.6 bar (125 psig) air
supply pressure.
Flow curves are for “optimal speed” conditions only. The “optimal speed” is that speed which
provides the maximum flow under a particular air and fluid pressure condition. The optimal speed
varies for different fluid and air pressures. Recommendations for optimal speed can be found on
the right side of the flow curve.
Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation parameters
will fall in the center of the pump performance curve.
[LPM]
Water Discharge Flow Rates
[LPM]
Water Discharge Flow Rate
This curve demonstrates the flow
created when the stroke rate is modi-
fied under a static air and fluid pres-
sure condition. This curve can be
applied to different pressure conditions
to estimate the change in flow due to
stroke rate.
SECTION 5E
PERFORMANCE CURVES
A8 METAL ACCU-FLO™ RUBBER/TPE-FITTED
SECTION 5F
70/30 OPERATING CONDITION
A8 METAL ACCU-FLO™ RUBBER/TPE-FITTED

9WILDEN PUMP & ENGINEERING, LLCWIL-10270-E-02
Height..................................668 mm (26.3")
Width...................................404 mm (15.9")
Depth ..................................343 mm (13.5")
Est. Ship Weight..........
Aluminum 32 kg (70 lbs)
Cast Iron 51 kg (112 lbs)
316 Stainless Steel 47 kg (104 lbs)
Alloy C 52 kg (114 lbs)
Air Inlet....................................19 mm (3/4")
Inlet............................................51 mm (2")
Outlet .........................................51 mm (2")
Suction Lift........................... 3.4 m Dry (11')
8.5 m Wet (28')
Displacement/Stroke ....... 1.74 l (0.46 gal.)1
Max. Flow Rate...............386 lpm (102 gpm)
Max. Size Solids.....................6.4 mm (1/4")
1Displacement per stroke was calculated at 4.8 bar
(70 psig) air inlet pressure against a 2 bar (30 psig)
head pressure.
Example: To pump 189 lpm (50 gpm) against
adischarge pressurehead of2.7bar (40 psig)
requires 5.5 bar (80 psig), 85 Nm3/h (50 scfm)
air consumption, and a pump speed of 120
strokes/minute. (See dot on chart.)
Caution: Do not exceed 8.6 bar (125 psig) air
supply pressure.
Flow curves are for “optimal speed” conditions only. The “optimal speed” is that speed which
provides the maximum flow under a particular air and fluid pressure condition. The optimal speed
varies for different fluid and air pressures. Recommendations for optimal speed can be found on
the right side of the flow curve.
Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation parameters
will fall in the center of the pump performance curve.
[LPM]
Water Discharge Flow Rates
[LPM]
Water Discharge Flow Rates
A8 Metal Accu-Flo™ Ultra-Flex™/PTFE-Fitted
This curve demonstrates the flow
created when the stroke rate is
modified under a static air and
fluid pressure condition. This
curve can be applied to different
pressure conditions to estimate
the change in flow due to stroke
rate.
SECTION 5G
PERFORMANCE CURVES
A8 METAL ACCU-FLO™ ULTRA-FLEX™/PTFE-FITTED
SECTION 5H
70/30 OPERATING CONDITION
A8 METAL ACCU-FLO™ ULTRA-FLEX™/PTFE-FITTED

10
WILDEN PUMP & ENGINEERING, LLC WIL-10270-E-02
Height..................................668 mm (26.3")
Width...................................610 mm (24.0")
Depth ..................................345 mm (13.6")
Est. Ship Weight..........
Aluminum 33 kg (72 lbs)
Cast Iron 52 kg (114 lbs)
316 Stainless Steel 48 kg (106 lbs)
Air Inlet....................................19 mm (3/4")
Inlet............................................51 mm (2")
Outlet .........................................51 mm (2")
Suction Lift........................... 3.4 m Dry (11')
9.5 m Wet (31')
Displacement/Stroke ....... 1.66 l (0.44 gal.)1
Max. Flow Rate...............568 lpm (150 gpm)
Max. Size Solids...................19.0 mm (1/4")
1Displacement per stroke was calculated at 4.8 bar
(70 psig) air inlet pressure against a 2 bar (30 psig)
head pressure.
Example: To pump 322 lpm (85 gpm) against
a discharge pressure head of 2.1 bar (30
psig) requires 4.1 bar (60 psig) and 110.5
Nm3/h (65 scfm) air consumption. (See dot
on chart.)
Caution: Do not exceed 8.6 bar (125 psig) air
supply pressure.
Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation parameters
will fall in the center of the pump performance curve.
[LPM]
Water Discharge Flow Rates
Height..................................668 mm (26.3")
Width...................................610 mm (24.0")
Depth ..................................345 mm (13.6")
Est. Ship Weight..........
Aluminum 33 kg (72 lbs)
Cast Iron 52 kg (114 lbs)
316 Stainless Steel 48 kg (106 lbs)
Air Inlet.................................19.1 mm (3/4")
Inlet............................................51 mm (2")
Outlet .........................................51 mm (2")
Suction Lift............................. 2.1 m Dry (7')
9.5 m Wet (28')
Displacement/Stroke ....... 1.89 l (0.50 gal.)1
Max. Flow Rate...............606 lpm (160 gpm)
Max. Size Solids...................19.0 mm (1/4")
1Displacement per stroke was calculated at 4.8 bar
(70 psig) air inlet pressure against a 2 bar (30 psig)
head pressure.
Example: To pump 322 lpm (85 gpm) against
adischargepressureheadof2.1 bar (30 psig)
requires 4.1 bar (60 psig) and 94 Nm3/h (55
scfm) air consumption. (See dot on chart.)
Caution: Do not exceed 8.6 bar (125 psig) air
supply pressure. Flow rates indicated on chart were determined by pumping water.
For optimum life and performance, pumps should be specified so that daily operation parameters
will fall in the center of the pump performance curve.
[LPM]
Water Discharge Flow Rates
SECTION 5I
PERFORMANCE CURVES
T8 METAL STALLION ULTRA-FLEX™-FITTED
SECTION 5J
PERFORMANCE CURVES
T8 METAL STALLION TPE-FITTED

11 WILDEN PUMP & ENGINEERING, LLCWIL-10270-E-02
SECTION 6A
SUCTION LIFT CURVES & DATA
Suction lift curves are calibrated for pumps operating at
305 m (1,000') above sea level. This chart is meant to be
a guide only. There are many variables which can affect
your pump’s operating characteristics. The number of intake
and discharge elbows, viscosity of pumping fluid, elevation
(atmospheric pressure) and pipe friction loss all affect the
amount of suction lift your pump will attain.
Dry Vacuum
FT H2O
PTFE
SECTION 6B
SUCTION LIFT CURVES & DATA
Suction lift curves are calibrated for pumps operating at
305 m (1,000') above sea level. This chart is meant to be
a guide only. There are many variables which can affect
your pump’s operating characteristics. The number of intake
and discharge elbows, viscosity of pumping fluid, elevation
(atmospheric pressure) and pipe friction loss all affect the
amount of suction lift your pump will attain.
Dry Vacuum
FT H
2
O
PTFE

12
WILDEN PUMP & ENGINEERING, LLC WIL-10270-E-02
SECTION 7A
INSTALLATION – T8 METAL
AIR-OPERATED PUMPS
The Model T8 Metal pump has a 51 mm (2") inlet and 51 mm
(2") outlet and is designed for flows to 617 lpm (163 gpm).
Refer to Section 5 for performance characteristics. The T8
Metal pump is manufactured with wetted parts of aluminum,
316 Stainless Steel, and Cast Iron. The center block of the
T8 Metal pump is constructed of polypropylene, aluminum,
nickel-plated aluminum, PTFE-coated aluminum, or stainless
steel. A variety of diaphragms, valve balls, valve seats and o-
rings are available to satisfy temperature, chemical compat-
ibility, abrasion and flex concerns.
The suction pipe size should be at least 51 mm (2") diameter
or larger if highly viscous material is being pumped. The
suction hose must be non-collapsible, reinforced type as
the T8 is capable of pulling a high vacuum. Discharge piping
should be at least 51 mm (2"); larger diameter can be used to
reduce friction losses. It is critical that all fittings and connec-
tions are airtight or a reduction or loss of pump suction capa-
bility will result.
INSTALLATION: Months of careful planning, study, and selec-
tion efforts can result in unsatisfactory pump performance if
installation details are left to chance.
Premature failureand longterm dissatisfactioncan be avoided
if reasonable care is exercised throughout the installation
process.
LOCATION: Noise, safety, and other logistical factors usually
dictate where equipment be situated on the production floor.
Multiple installations with conflicting requirements can result
in congestion of utility areas, leaving few choices for siting of
additional pumps.
Within the framework of these and other existing conditions,
every pump should be located in such a way that five key
factors are balanced against each other to maximum advan-
tage.
ACCESS: First of all, the location should be accessible. If it’s
easy to reach the pump, maintenance personnel will have an
easier time carrying out routine inspections and adjustments.
Should major repairs become necessary, ease of access can
play a key role in speeding the repair process and reducing
total downtime.
AIR SUPPLY: Every pump location should have an air line
large enough to supply the volume of air necessary to achieve
the desired pumping rate (see Section 5). Use air pressure up
to a maximum of 8.6 bar (125 psig) depending upon pumping
requirements.
For best results, the pumps should use a 5 micron air filter,
needle valve and regulator. The use of an air filter before the
pump will insure that the majority of any pipeline contami-
nants will be eliminated.
SOLENOID OPERATION: When operation is controlled by
a solenoid valve in the air line, three-way valves should be
used. This valve allows trapped air between the valve and
the pump to bleed off which improves pump performance.
Pumping volume can be determined by counting the number
of strokes per minute and then multiplying the figure by the
displacement per stroke.
MUFFLER: Sound levels are reduced below OSHA speci-
fications using the standard Wilden muffler element. Other
mufflers can be used to further reduce sound levels, but they
usually reduce pump performance.
ELEVATION: Selecting a site that is well within the pump’s
dynamic lift capability will assure that loss-of-prime trou-
bles will be eliminated. In addition, pump efficiency can be
adversely affected if proper attention is not given to site
location.
PIPING: Final determination of the pump site should not be
made until the piping problems of each possible location have
been evaluated. The impact of current and future installations
should be considered ahead of time to make sure that inad-
vertent restrictions are not created for any remaining sites.
The best choice possible will be a site involving the short-
est and the straightest hook-up of suction and discharge
piping. Unnecessary elbows, bends, and fittings should be
avoided. Pipe sizes should be selected so as to keep friction
losses within practical limits. All piping should be supported
independently of the pump. In addition, the piping should be
aligned so as to avoid placing stresses on the pump fittings.
Flexible hose can be installed to aid in absorbing the forces
created by the natural reciprocating action of the pump. If the
pump is to be bolted down to a solid foundation, a mount-
ing pad placed between the pump and foundation will assist
in minimizing pump vibration. Flexible connections between
the pump and rigid piping will also assist in minimizing pump
vibration. If quick-closing valves are installed at any point
in the discharge system, or if pulsation within a system
becomes a problem, a surge suppressor should be installed
to protect the pump, piping and gauges from surges and
water hammer.
If the pump is to be used in a self-priming application, be
sure that all connections are airtight and that the suction lift is
within the model’s ability. Note: Materials of construction and
elastomer material have an effect on suction lift parameters.
Please refer to Section 6 for specifics.
When pumps are installed in applications involving flooded
suction or suction head pressures, a gate valve should be
installed in the suction line to permit closing of the line for
pump service.
Pumps in service with a positive suction head are most effi-
cient when inlet pressure is limited to 0.5–0.7 bar (7–10 psig).
Premature diaphragm failure may occur if positive suction is
0.7 bar (10 psig) and higher.
THE MODEL T8 WILL PASS 6.4 mm (1/4") SOLIDS. THE T8
STALLION WILL PASS 19 mm (3/4") SOLIDS. WHENEVER
THE POSSIBILITY EXISTS THAT LARGER SOLID OBJECTS
MAY BE SUCKED INTO THE PUMP, A STRAINER SHOULD
BE USED ON THE SUCTION LINE.
BLOW OUT AIR LINE FOR 10 TO 20 SECONDS BEFORE
ATTACHING TO PUMP TO MAKE SURE ALL PIPE LINE
DEBRIS IS CLEAR. ALWAYS USE AN IN-LINE AIR
FILTER.
CAUTION: DO NOT EXCEED 8.6 BAR (125 PSIG) AIR
SUPPLY PRESSURE. (3.4 BAR [50 PSIG] FOR UL
MODELS.)
CAUTION: DO NOT HANG T8 STALLION PUMPS BY THEIR
HANDLES.

13 WILDEN PUMP & ENGINEERING, LLCWIL-10270-E-02
SUGGESTED INSTALLATION
SECTION 7B – AIR OPERATION
SUGGESTED OPERATION AND
MAINTENANCE INSTRUCTIONS
OPERATION: The T8 is not pre-lubricated, and may require
in-line lubrication. Pump discharge rate can be controlled
by limiting the volume and/or pressure of the air supply to
the pump (preferred method). An air regulator is used to
regulate air pressure. A needle valve is used to regulate
volume. Pump discharge rate can also be controlled by
throttling the pump discharge by partially closing a valve
in the discharge line of the pump. This action increases
friction loss which reduces flow rate. (See Section 5.) This
is useful when the need exists to control the pump from a
remote location. When the pump discharge pressure equals
or exceeds the air supply pressure, the pump will stop;
no bypass or pressure relief valve is needed, and pump
damage will not occur. The pump has reached a “dead-
head” situation and can be restarted by reducing the fluid
discharge pressure or increasing the air inlet pressure. The
Wilden T8 pump runs solely on compressed air and does
not generate heat, therefore your process fluid temperature
will not be affected.
MAINTENANCE AND INSPECTIONS: Since each applica-
tion is unique, maintenance schedules may be different
for every pump. Frequency of use, line pressure, viscosity
and abrasiveness of process fluid all affect the parts life
of a Wilden pump. Periodic inspections have been found
to offer the best means for preventing unscheduled pump
downtime. Personnel familiar with the pump’s construction
and service should be informed of any abnormalities that
are detected during operation.
RECORDS: When service is required, a record should be
made of all necessary repairs and replacements. Over a
period of time, such records can become a valuable tool
for predicting and preventing future maintenance problems
and unscheduled downtime. In addition, accurate records
make it possible to identify pumps that are poorly suited to
their applications.
AIR OPERATED PUMPS: To stop the pump from oper-
ating in an emergency situation, simply close the “shut
off” valve (user supplied) installed in the air supply line.
A properly functioning valve will stop the air supply to
the pump, therefore stopping output. This shut off valve
should be located far enough away from the pumping
equipment such that it can be reached safely in an
emergency situation.
ACCU-FLO™ PUMPS: Accu-Flo™pumpsfunctionwith
solenoid valves and require an electrical control circuit
to supply pulses. Under normal operating conditions,
the control circuit is sufficient for starting and stopping
the pump. However, the shut off valve (user supplied)
installed in the air supply line can be used to stop the
pump if necessary. Therefore, it should be located far
enough away from the pumping equipment such that it
can be reached safely in an emergency situation.
NOTE: In the event of a power failure, the shut off valve should be closed, if the
restarting of the pump is not desirable once power is regained.
®

14
WILDEN PUMP & ENGINEERING, LLC WIL-10270-E-02
SECTION 7D
INSTALLATION – A8 METAL
ACCU-FLO™ PUMPS
Before installing your A8 Accu-Flo™ pump, review Section
7A for general installation suggestions including Location,
Access, Air Supply, Elevation, and Piping.
The Accu-Flo™ Model A8 has a 51 mm (2") inlet and 51 mm
(2") outlet and is designed for flows to 617 lpm (163 gpm).
This maximum flow rate was calculated at 300 strokes per
minute with 100 psig air inlet against 0 psig discharge head.
The A8 Metal pump is manufactured with wetted parts of
aluminum, cast iron, 316 stainless steel, or Alloy C. The
center block of the A8 Metal pump is of polypropylene,
aluminum, nickel-plated aluminum, PTFE-coated aluminum
or 316 stainless steel construction. A variety of diaphragms,
valve balls, and o-rings are available to satisfy temperature,
chemical compatibility, abrasion and flex concerns.
All wiring used to operate the pump should be placed and
connected according to the proper electrical codes. It is
important that the wiring is of adequate gauge to carry
the current required to operate the pump. In addition, it is
necessary that the electrical power supply is large enough
to supply the current required to operate the pump. Wiring
should be above ground level if possible (in case of fluid
spill or leakage), and all wiring and connections which could
become wet or damp should be made watertight.
If the pump is to be used in a self-priming application, be
sure that all connections are airtight and that the suction lift
is within the pump’s ability. Note: Materials of construction
and elastomer material have an effect on suction lift param-
eters. Please refer to pump performance data.
Pumps in service with a positive suction head are most effi-
cient when inlet pressure is limited to 0.5–0.7 bar (7–10 psig).
Premature diaphragm failure may occur if positive suction
head is 0.8 bar (11 psig) and higher.
The solenoid valve is rated for continuous duty; however,
stopping on an even number stroke count insures that the
electrical power is off when pump is stopped. This practice is
safer and also eliminates unwanted strokes when the system
is shut down and electrical power is off.
THE MODEL A8 WILL PASS 3 mm (1/8") SOLIDS. WHEN-
EVER THE POSSIBILITY EXISTS THAT LARGER SOLID
OBJECTS MAY BE SUCKED INTO THE PUMP, A STRAINER
SHOULD BE USED ON THE SUCTION LINE.
SECTION 7C
OPERATING PRINCIPLES BEHIND
ACCU-FLO™ PUMPS
InAccu-Flo™pumpmodels,thestandardairvalveisreplaced
with a two position, four-way solenoid valve that has a single
operator and spring return. The valve is internally air piloted
for longer coil and operator life.
When the solenoid is unpowered, one air chamber is pres-
surized with air, while the opposite chamber is exhausted.
When electric power is applied, the solenoid shifts, and the
pressurized air chamber is exhausted while the opposite
chamber is pressurized. By alternately applying and remov-
ing power, the solenoid-operated pump runs like a standard
Wilden pump.
The speed of the pump is controlled electrically. Since each
stroke is controlled by an electrical signal, the pump is ideal for
batching and other electrically controlled dispensing applica-
tions.
Although the speed of the pump is controlled electrically,
the air pressure is important. Air pressure displaces the fluid,
and if the pressure is insufficient to complete the physical
stroke before an electronic impulse signals the pump to shift,
the stroke will not be completed, and the displacement per
stroke will be reduced. This does not harm the unit in any
way, but it may cause inaccuracy when attempting to batch
specific quantities with high precision if this effect is not
taken into account.
There are three coil voltage options available. One coil allows
for 24V DC operation. The second coil option allows for
operation with either 12V DC or 24V AC at 60 Hz and the
third coil option allows for 110V AC operation.
WARNING: Before installation, consult chart in Section
10B to ensure proper electrical connection.
WARNING: The solenoid valve should not be used in
an area where explosion proof equipment is required
unless NEMA 7 valve is specified.
There are three coil options available in both NEMA 4 and
NEMA 7 ratings. One coil allows for 110V AC operation, one
allows for 24V DC operation, and the third allows for either
24V AC or 12V DC operation. Additional solenoid information
and part numbers can be found in Section 10C.

15 WILDEN PUMP & ENGINEERING, LLCWIL-10270-E-02
ACCU-FLO™ ELECTRICAL
CONNECTIONS
ACCU-FLO™ PLUMBING
CONNECTIONS
SECTION 7E – ACCU-FLO™
SUGGESTED OPERATION AND
MAINTENANCE INSTRUCTIONS
OPERATION: The speed of the pump is controlled electrically.
Since each stroke is controlled by an electrical signal, the
pump is ideal for batching and other electrically controlled
dispensing applications.
Although the speed of the pump is controlled electrically,
the air pressure is important. Air pressure displaces the fluid,
and if the pressure is insufficient to complete the physical
stroke before an electronic impulse signals the pump to shift,
the stroke will not be completed, and the displacement per
stroke will be reduced. This does not harm the unit in any
way, but it may cause inaccuracy when attempting to batch
specific quantities with high precision.
The solenoid operated pump is permanently lubricated
during assembly, and requires no additional lubrication under
normal operation. If the unit runs under extreme conditions
(continuous operation at high speeds), it may be necessary
to relubricate the center block with a white EP bearing
grease every 50 million cycles. Continuous lubrication with
a compatible oil is not harmful, and will provide longer seal
life, but it may flush all grease out of the unit.
A red button on the side of the air valve is a manual over-
ride; when actuated it will shift the valve as if an electric
current had actuated the solenoid.
RECORDS: When service is required, a record should be
made of all necessary repairs and replacements. Over a
period of time, such records can become a valuable tool
for predicting and preventing future maintenance problems
and unscheduled downtime. In addition, accurate records
make it possible to identify pumps that are poorly suited to
their applications.
MAINTENANCE AND INSPECTIONS: Since each applica-
tion is unique, maintenance schedules may be different
for every pump. Frequency of use, line pressure, viscosity
and abrasiveness of process fluid all affect the parts life
of a Wilden pump. Periodic inspections have been found
to offer the best means for preventing unscheduled pump
downtime. Personnel familiar with the pump’s construction
and service should be informed of any abnormalities that
are detected during operation. Internal maintenance is not
recommended for Accu-Flo™ solenoid air valves. When
worn or damaged, a new air valve body, coil or terminal
connector must be purchased. Please consult section 9C
for part numbers.

16
WILDEN PUMP & ENGINEERING, LLC WIL-10270-E-02
SECTION 7F – AIR-CONTROLLED
TROUBLESHOOTING
Pump will not run or runs slowly.
1. Check air inlet screen and air filter for debris.
2. Check for sticking air valve, flush air valve in solvent.
3. Check for worn out air valve. If piston face in air valve is
shiny instead of dull, air valve is probably worn beyond
working tolerances and must be replaced.
4. Check center block Glyd™ rings. If worn excessively, they
will not seal and air will simply flow through pump and out
air exhaust. Use only Wilden Glyd™ rings as they are of
special construction.
5. Check for rotating piston in air valve.
6. Check type of lubricant being used. A higher viscosity
oil than suggested may cause the piston to stick or run
erratically. Wilden suggests the use of an oil with arctic
characteristics (ISO 15-5 wt.).
Pump runs but little or no product flows.
1. Check for pump cavitation; slow pump speed down to
match thickness of material being pumped.
2. Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers, swell-
ing may occur. Replace ball check valves and o-rings with
the proper elastomers.
3. Check to make sure all suction connections are air tight,
especially clamp bands around intake balls.
Pump air valve freezes.
Check for excessive moisture in compressed air. Either install
dryer or hot air generator for compressed air.
Air bubbles in pump discharge.
1. Check for ruptured diaphragm.
2. Check tightness of clamp bands, especially at intake
manifold.
Product comes out air exhaust.
1. Check for diaphragm rupture.
2. Check tightness of piston plates to shaft.
Pump rattles.
1. See E9 Troubleshooting Guide.
2. Create false discharge head or suction lift.
SECTION 7G – ACCU-FLO™
TROUBLESHOOTING
Pump will not run.
1. Check for pressurized air at the inlet. (min. 3.1 bar [45
psig].)
2. Check air inlet and filter for debris.
3. Connect a test lamp to the two wires which run to pump
and ensure that the lamp cycles on and off.
4. Make sure that the air valve manual override (small red
knob on front of valve) is switched to the “0” position.
5. Check pilot pressure vent at the top of the operator/coil
assembly to ensure that it is not clogged.
6. Check for a worn out air valve. If air continually blows out
the exhaust in very large quantities, the air valve seals may
be worn beyond their ability to function. In this case, the
valve must be replaced.
NOTE: Before the valve is scrapped, it is possible that
it may be saved by completely disassembling the valve,
cleaning all components and relubricating the valve.
Pump runs but little or no fluid comes out.
1. Check that the discharge isolation valve is not closed.
2. Check that the electronic signal is slow enough that the
pump is able to complete each physical stroke before
it is signaled to change direction. The time required to
complete the stroke is determined by a variety of factors
which include fluid viscosity and head pressure. The shaft
can be viewed if the muffler is removed to verify that the
pump is stroking.
3. Check for pump cavitation; slow pump speed down to
match the thickness of the material being pumped.
4. Check for sticking ball check valves. If the material being
pumped is not compatible with the pump elastomers,
swelling may occur. Replace ball check valves and o-ring
with the proper elastomers.
5. Check to make sure that all suction connections are air
tight, and that the clamp bands are properly tightened.
Pump air passages blocked with ice.
Check for excessive moisture in compressed air line. As
the air expands out the exhaust during the operation of the
pump, water vapor entrapped in the compressed air can
freeze and block the air passageways in the pump. If this
occurs, it may be necessary to install a coalescing filter, an
air dryer, or a hot air generator for the compressed air.
Air bubbles in pump discharge.
1. Check for ruptured diaphragm.
2. Check tightness of clamp bands, and the integrity of the
o-rings, especially at intake manifold.
Product comes out air exhaust.
1. Check for diaphragm rupture.
2. Check tightness of piston plates to shaft.
Pump rattles.
1. Create false discharge head or suction lift.
Solenoid buzzes or solenoid burnout.
1. Incorrect voltage, faulty or dirty solenoid.
Solenoid valve fails to shift electrically but shifts with
manual override.
1. Incorrect voltage, defective coil or wiring.
Solenoid valve fails to shift electrically or with manual
override.
1. Inadequate air supply, contamination, inadequate or
improper lubrication, mechanical binding in the valve.
Valve shifts but fails to return.
1. Broken spring, mechanical binding.
Excessive leaking from air valve vent.
1. Worn seals in air valve.

17 WILDEN PUMP & ENGINEERING, LLCWIL-10270-E-02
SECTION 8A
T8 METAL
DIRECTIONS FOR DISASSEMBLY/REASSEMBLY
Step 2. Figure 2
Utilizing the 13 mm (1/2") box wrench, remove the two small
clamp bands that fasten the discharge manifold to the liquid
chambers.
Step 3. Figure 3
Remove the discharge manifold to expose the valve balls and
seats. Inspect the ball cage area of the manifold for excessive
wear or damage. Remove the discharge valve balls, seats and
o-rings from the discharge manifold and inspect for nicks,
gouges, chemical attack or abrasive wear. Replace worn parts
with genuine Wilden parts for reliable performance. PTFE
o-rings should be replaced when reassembled.
CAUTION: Before any maintenance or repair is attempted,
the compressed air line to the pump should be disconnected
and all air pressure allowed to bleed from the pump. Discon-
nect all intake, discharge, and air lines. Drain the pump by
turning it upside down and allowing any fluid to flow into
a suitable container. Be aware of any hazardous effects of
contact with your process fluid.
The Wilden T8 has a 51 mm (2") inlet and 51 mm (2") outlet
and is designed for flows up to 617 lpm (163 gpm). The model
T8 is available in aluminum, cast iron, or 316 stainless steel
wetted parts. The center block is available in polypropylene,
aluminum, nickel-plated aluminum, PTFE-coated aluminum
and 316 stainless steel. All o-rings used in the pump are of
a special material and shore hardness that should only be
replaced with factory-supplied parts.
TOOLS REQUIRED:
Adjustable Wrench
13 mm (1/2") Socket
14 mm (9/16") Box Wrench
17 mm (11/16") Socket
25 mm (1") Box Wrench or Adjustable Wrench
Vise equipped with soft jaws (such as plywood, plastic
or other suitable material)
NOTE: The model used for these instructions incorporates
rubber diaphragms, balls, and seats. Models with PTFE
diaphragms, balls and seats are the same except where
noted. The procedures for A8 Accu-Flo™ pumps are the
same except for the air distribution system.
DISASSEMBLY:
Step 1.
Before starting disassembly, mark a line from each liquid
chamber to its corresponding air chamber. This line will
assist in proper alignment during reassembly.
Figure 1

18
WILDEN PUMP & ENGINEERING, LLC WIL-10270-E-02
Step 4. Figure 4
Remove the two small clamp bands that fasten the intake
manifold to the liquid chambers.
Step 5. Figure 5
Lift the intake manifold away to expose the valve balls and
seats. Inspect intake valve ball cage for excessive wear or
damage. Remove the intake valve balls, seats and o-rings
from the discharge manifold and inspect for nicks, gouges,
chemical attack or abrasive wear. Replace worn parts with
genuine Wilden parts for reliable performance. PTFE o-rings
should be replaced when reassembled.
Step 6. Figure 6
With 14 mm (9/16") socket and 17 mm (11/16") box wrench,
remove one set of large clamp bands that attach liquid
chamber to center section assembly.
Step 7. Figure 5
Lift liquid chamber away from center section to expose
diaphragm and outer piston.