Page 1
H38
Advanced™ Series METAL Pumps
Advance your process
Engineering
Operation &
Maintenance
High
Pressure
WI L-11181 - E- 04
RE P L AC ES WI L-11181 - E- 03
Page 2
TABLE OF CONTENTS
SECTION 1 CAUTIONS—READ FIRST! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SECTION 2 WILDEN PUMP DESIGNATION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SECTION 3 HOW IT WORKS—PUMP & AIR DISTRIBUTION SYSTEM . . . . . . . . . . . . . . . . . . 3
SECTION 4 DIMENSIONAL DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
SECTION 5 SUGGESTED INSTALLATION, OPERATION & TROUBLESHOOTING . . . . . . . . .5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Operation & Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
SECTION 6 DIRECTIONS FOR DISASSEMBLY / REASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pro-Flo® Air Distribution System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Reassembly Hints & Tips, Torque Specs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
SECTION 7 EXPLODED VIEW / PARTS LISTING
H38/3200D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
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Page 3
Section 1
CAUTIONS—READ FIRST!
PUMP TEMPERATURE LIMITS
-12.2°C to 65.6°C 10°F to 150°F
CAUTION: The discharge pressure generated by this
pump is approximately 26 times the inlet air pressure
supplied.
CAUTION: Do not apply compressed air to the exhaust
ports — pump will not function.
CAUTION: The model H38/3200D is designed to pump
clean fluid such as hydraulic fluid and should not be
used for pumping solid objects or particles. Whenever
the possibility exists that solid objects or particles may
be sucked into the pump, a strainer should be used on
the suction line.
CAUTION: Do not over-lubricate air supply — excess
lubrication will reduce pump performance. Pump is prelubed with NLGI Grade 2 molybdenum grease.
CAUTION: The H38/3200D is designed for open loop
systems.
CAUTION: Maximum temperature limits are based
upon mechanical stress only. Certain chemicals will
significantly reduce maximum safe operating temperatures. Consult Wilden’s Chemical Resistance Guide
(see publication E-4) for chemical compatibility and
temperature limits.
WARNING: Prevention of static sparking — If static
sparking occurs, fire or explosion could result. Pump,
valves, and containers must be grounded to a proper
grounding point when handling flammable fluids and
whenever discharge of static electricity is a hazard.
CAUTION: Do not exceed 8.6 bar (125 psig) air supply
pressure.
CAUTION: The process fluid and cleaning fluids must
be chemically compatible with all wetted pump components (see publication E-4).
CAUTION: Pumps should be thoroughly flushed with
water before installation.
CAUTION: Always wear safety glasses and proper
protection when operating and maintaining pump.
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. 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 pipeline
debris is clear. Use an in-line air filter. A 5µ (micron) air
filter is suggested.
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: Pump is not rated for UL 79 service.
CAUTION: H38 pumps are not submersible.
CAUTION: Tighten all hardware prior to installation.
CAUTION: All piping valves, gauges and other com-
ponents installed on the liquid discharge must have a
minimum pressure rating of 220.6 bar (3,200 psig).
WIL-11181-E-04 1 WILDEN PUMP & ENGINEERING, LLC
Page 4
Section 2
WILDEN PUMP DESIGNATION SYSTEM
H38/3200D METAL
10 mm (3/8") Pump
Maximum Flow Rate:
7.6 lpm (2.0 gpm)
MATERIAL CODES
LEGEND
MODEL
H38 = 10 mm (3/8”) CONNECTIONS
MAX. DISCHARGE PRESSURE
3200 = 220.6 BAR (3,200 PSIG)
PUMP TYPE
D = DUPLEX
LIQUID CHAMBER
A = ALUMINUM
CENTER SECTION
A = ALUMINUM
AIR VALVE
P = POLYPROYLENE
LIQUID PISTON SEALS
PU = POLYURETHANE
VALVE BALLS
SS = STAINLESS STEEL
VALVE SEATS
S = STAINLESS STEEL
VALVE SEAT O-RINGS
BN = BUNA-N
WILDEN PUMP & ENGINEERING, LLC 2 WIL-111 81- E- 04
Page 5
Section 3
HOW IT WORKS—PUMP
The Wilden piston 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.
CLOSED
OPEN
BA
OPEN
RIGHT STROKE RIGHT STROKE
FIGURE 1: When air pressure is supplied to the
pump, the air valve directs pressure to the back
side of power piston A. The compressed air
moves the power/liquid piston A away from the
center section of the pump. At the same time,
air is directed to the front of power piston B by
means of tubing connected to the pressurized
air in side A. Power piston/liquid piston B is
on its suction stroke; air behind the piston has
been forced out to atmosphere through the
exhaust port of the pump. The movement of
power/liquid piston B toward the center section
of the pump creates a vacuum within chamber
B. Atmospheric pressure forces fluid into the
inlet port forcing the inlet valve ball, on side B,
off its seat. Liquid is then free to move past the
inlet valve ball and fill liquid chamber B (see
shaded area).
CLOSED
OPEN
BA
CLOSED
CLOSED
OPEN
LEFT STROKE
FIGURE 2: When piston A reaches the limit of its
discharge stroke, the air valve redirects pressurized air to the back side of the power/liquid piston
B and the front side of power/liquid piston A. The
pressurized air forces power/liquid piston B away
from the center section while pressurized air forces
power/liquid piston A toward the center section.
Power/liquid piston B is now on its discharge
stroke. Liquid piston B forces the inlet valve ball,
on side B, onto its seat due to the hydraulic forces
developed within the liquid chamber. 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 combined force created
by both power pistons being pressurized and the
smaller size of the liquid piston area relative to the
total area of the power piston creates the amplified liquid discharge pressure. The movement of
power/liquid piston A toward the center section of
the pump creates a vacuum within liquid chamber
A. Atmospheric pressure forces fluid into the inlet
port. The inlet valve ball, on side B, is forced off its
seat allowing the fluid being pumped to fill liquid
chamber A.
CLOSED
BA
OPEN
FIGURE 3: At completion of the stroke, the air
valve again redirects air to the back side of
power/liquid piston A, which starts power/liquid piston B on its suction stroke. As the pump
reaches its original starting point, each power/
liquid piston has gone through one suction
and one discharge stroke. This constitutes one
complete pumping cycle. The pump may take
several cycles to completely prime depending
on the conditions of the application.
OPEN
CLOSED
AIR DISTRIBUTION SYSTEM—HOW IT WORKS
The Pro-Flo® patented air distribution system incorporates
three moving parts: the air valve spool, the pilot spool, and the
main shaft/piston assembly. The heart of the system is the air
valve spool and air valve. As shown in this figure, this valve
design incorporates an unbalanced spool. The smaller end of
the spool is pressurized continuously, while the large end is
alternately pressurized then exhausted to move the spool. The
spool directs pressurized air to one air chamber while exhausting the other. The air causes the main shaft/piston assembly to
shift to one side — discharging liquid on that side and pulling
liquid in on the other side. When the shaft reaches the end of its
stroke, the power piston actuates the pilot spool, which pressurizes and exhausts the large end of the air valve spool. The
repositioning of the air valve spool routes the air to the other
air chamber.
WIL-11181-E-04 3 WILDEN PUMP & ENGINEERING, LLC
Page 6
Section 4
DIMENSIONAL DRAWINGS
H38/3200D Metal
Front View
13 mm (1/2”)
FNPT AIR INLET
A
Bottom View
K
Side View
F
10 mm (3/8”)
(37° FLARE TUBE
FITTING)
D
C
B
4X N
M
L
4X P
E
J
DIMENSIONS
ITEM METRIC (mm) STANDARD (inch)
A 356 14.0
B 178 7.0
C 145 5.7
D 218 8.6
E 208 8.2
F 150 5.9
G 119 4.7
H 145 5.7
J 279 11.0
K 302
L 178 7.0
M 229 9.0
N 10 0.4
P N/A
G
13 mm (1/2”)
FNPT AIR EXHAUST
F
11.9
#10-32UNF-2B THRU
H
10 mm (3/8”)
(37° FLARE TUBE
FITTING)
WILDEN PUMP & ENGINEERING, LLC 4 WIL-111 81- E- 04
Page 7
Section 5
SUGGESTED OPERATION & MAINTENANCE
The H38/3200D has a 10 mm (3/8”) 37° flared tube fitting
inlet and outlet and is designed for discharge pressure to
220.6 bar (3,200 psig). Refer to Section 5 for performance
characteristics. The H38/3200D pump is manufactured with
wetted parts of aluminum. The H38/3200D is available with
a polypropylene air valve and aluminum center section.
The suction pipe size should be at least 10 mm (3/8”)
diameter or larger if highly viscous material is being pumped.
The suction hose must be non-collapsible, reinforced type
as the H38/3200D is capable of pulling a high vacuum.
Discharge piping should be at least 10 mm (3/8”) and must
have a minimum pressure rating of 220.6 bar (3,200 psig);
larger diameter can be used to reduce friction losses. It
is critical that all fittings and connections are airtight or a
reduction of pump suction capability will result.
INSTALLATION: Months of careful planning, study, and
selection efforts can result in unsatisfactory pump performance if installation details are left to chance.
Premature failure and long term dissatisfaction can be
avoided if reasonable care is exercised throughout the
installation process.
LOCATION: Noise, safety, and other logistical factors usually dictate where equipment will be situated on the production floor. Multiple installations with conflicting requirements
can result in congestion of utility areas, leaving few choices
for 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 advantage.
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
on pumping requirements.
For best results, the pumps should use a 5µ (micron) air
filter, needle valve and regulator. The use of an air filter
before the pump will ensure that the majority of any pipeline
contaminants will be eliminated.
MUFFLER: Sound levels are reduced below OSHA specifications using the standard Wilden muffler. 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 troubles 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 inadvertent restrictions are not created for any
remaining sites.
The best choice possible will be a site involving the shortest and 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 stress on the
pump fittings.
If the pump is to be bolted down to a solid location, a
mounting pad placed between the pump and the foundation will assist in minimizing pump vibration.
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.
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.
THE MODEL H38/3200D SHOULD NOT BE USED WITH
MEDIA CONTAINING SOLIDS. WHENEVER THE POSSIBILITY
EXISTS THAT SOLID OBJECTS MAY BE SUCKED INTO THE
PUMP, A STRAINER SHOULD BE USED ON THE SUCTION
LINE.
CAUTION: THE H38/3200D PUMP IS DESIGNED FOR
OPEN LOOP SYSTEMS.
CAUTION: DO NOT EXCEED 8.6 BAR (125 PSIG) AIR
SUPPLY PRESSURE.
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.
WIL-11181-E-04 5 WILDEN PUMP & ENGINEERING, LLC
Page 8
Section 4
SUGGESTED INSTALLATION
SUGGESTED OPERATION & MAINTENANCE
OPERATION: The H38/3200D is pre-lubricated and does not
require in-line lubrication. Additional lubrication will not damage the pump, however if the pump is heavily lubricated by an
external source, the pump operation may be affected. It may
need to be disassembled and re-lubricated as described in
the ASSEMBLY/DISASSEMBLY INSTRUCTIONS.
Pump discharge rate can be controlled by limiting the volume and/or pressure of the air supply to the pump (preferred
method). A regulator is used to control air pressure while a
needle valve is used to control 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 approximately 26 times the air
inlet pressure, the pump will stop; no bypass or pressure
relief valve is needed, and pump damage will not occur.
The pump has reached a “deadhead” situation and can be
restarted by reducing the fluid discharge pressure or increasing the air inlet pressure. The H38/3200D pump runs solely
on compressed air and generates little heat, therefore your
process fluid temperature will not be affected.
MAINTENANCE AND INSPECTIONS: Since each application 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.
WILDEN PUMP & ENGINEERING, LLC 6 WIL-111 81- E- 04
Page 9
Section 5
TROUBLESHOOTING
Pump will not run or runs slowly.
1. Ensure that the air inlet pressure is at least 0.4 bar
(5 psig) above startup pressure and that the discharge
pressure is at least 0.7 bar (10 psig) lower than 26 times
the air inlet pressure.
2. Check air inlet filter for debris (see recommended installation).
3. Check for extreme air leakage (blow by) which would
indicate worn seals/bores in the air valve, pilot spool,
main shaft.
4. Disassemble pump and check for obstructions in the
air passageways or objects which would obstruct the
movement of internal parts.
5. Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers, swelling may occur. Replace seals with proper elastomers.
Also, as the check valve balls wear out, they become
smaller and can become stuck in the seats. In this case,
replace balls and seats.
6. Check for broken liquid piston stud which will cause the
air valve spool to be unable to shift.
7. Remove plug from pilot spool exhaust.
Pump runs but little or no product flows.
1. Check for pump cavitation; slow pump speed down to
allow thick material to flow into liquid chambers.
2. Verify that vacuum required to lift liquid is not greater
than the vapor pressure of the material being pumped
(cavitation).
3. Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers, swelling may occur. Replace seals with proper elastomers.
Also, as the check valve balls wear out, they become
smaller and can become stuck in the seats. In this case,
replace balls and seats.
Pump air valve freezes.
1. Check for excessive moisture in compressed air. Either
install a dryer or hot air generator for compressed air.
Alternatively, a coalescing filter may be used to remove
the water from the compressed air in some applications.
Air bubbles in pump discharge.
1. Check tightness of fasteners and integrity of O-rings and
seals, especially at intake manifold.
2. Ensure pipe/tube connections are airtight.
Product comes out air exhaust.
1. Check for liquid piston seal failure.
2. Check tightness of liquid pistons to shaft.
WIL-11181-E-04 7 WILDEN PUMP & ENGINEERING, LLC
Page 10
Section 6
PUMP DISASSEMBLY
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. 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. Be aware of the hazardous effects associated with
contact with your process fluid.
The Wilden H38/3200D metal pump has a 10 mm (3/8”) inlet
and outlet and is designed for flows up to 7.6 lpm (2.0 gpm). Its
air distribution system is based on a revolutionary design which
increases reliability and performance. The H38/3200D is available in aluminum wetted parts. The center section is available in
aluminum. The air valve is available in polypropylene.
TOOLS REQUIRED:
6 mm (1/4”) Hex Head Wrench 6mm
5 mm (3/16”) Hex Head Wrench
14 mm (9/16”) Wrench
17 mm (11/16”) Wrench
O-ring Pick
Air Nozzle
Adjustable Wrench
Vise equipped w/soft jaws
(such as plywood, plastic or other suitable material)
DISASSEMBLY:
Step 1. Figure 1
Before starting disassembly, mark a line from each liquid
chamber to the center section. This line will assist in proper
alignment during reassembly.
Step 2. Figure 2
Using an 17 mm (
both fasteners that connect the discharge
manifold to the manifold plate elbows
and pull discharge manifold away from
pump.
WILDEN PUMP & ENGINEERING, LLC 8 WIL-111 81- E- 04
11/16
”) wrench, loosen
Step 3. Figure 3
Using a 6 mm (1/4”) hex head wrench,
remove the bolts connecting the pump
feet to both liquid chambers.
Step 4. Figure 4
”)
Using an 17 mm (11/16
loosen both fasteners that connect
the inlet manifold to the manifold plate
elbows and pull inlet manifold away
from pump.
wrench,
Page 11
Section 5
PUMP DISASSEMBLY
Step 5. Figure 5
”)
Using a 14 mm (9/16
fasteners connecting both nylon tubes to
each liquid chamber by turning counter
clockwise.
wrench, loosen
Step 6. Figure 6
Disconnect nylon tubing by pulling nylon
tubing away from brass elbow.
Step 7. Figure 7
Using a 6 mm (1/4”) hex head wrench,
remove the liquid chamber bolts that
connect the liquid chamber to the center
section.
Step 8. Figure 8
To lift the liquid chamber away from the
center section, apply 1.0 bar (15 psig)
of air pressure, via a rubber tipped air
nozzle into the brass elbow located at
the top of the liquid chamber.
WIL-11181-E-04 9 WILDEN PUMP & ENGINEERING, LLC
Step 9. Figure 9
The air pressure will force the liquid
chamber away from the power piston to
allow for easy removal. To remove the
opposite liquid chamber repeat Step 9.
Step 10. Figure 10
Inspect center section flange O-rings
on each side of the center section and
replace if necessary.
Page 12
Section 4
PUMP DISASSEMBLY
Step 11. Figure 11
To remove the shaft assembly, secure either power/liquid
piston into a vice equipped with soft jaws. Next, remove the
opposite power/liquid piston by turning counter clockwise.
Step 13. Figure 13
Using a 6 mm (1/4”) hex head wrench,
loosen the discharge manifold bolts by
turning counter clockwise.
Step 14. Figure 14
Next, inspect the manifold O-ring for
nicks, gouges, chemical attack or abrasive wear. Replace if necessary.
Step 12. Figure 12
To remove the shaft from the power/liquid piston assembly, first secure shaft in vise equipped with soft jaws. Next,
remove power/liquid piston assembly by turning counter
clockwise.
Step 15. Figure 15
Using an O-ring pick, remove the manifold O-ring, valve seat O-ring, valve seat,
valve ball and ball cage. Inspect and
replace worn parts if necessary. Repeat
process for the three remaining valve
ball/valve seat locations.
NOTE: When reinstalling valve balls and
valve seats, the valve seat should be
positioned at the bottom of the assembly with the valve ball positioned in the
center and the ball cage positioned at
the top.
WILDEN PUMP & ENGINEERING, LLC 10 WIL-111 81- E- 04
Page 13
Section 5
DISASSEMBLY/REASSEMBLY—PRO-FLOW ADS
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. 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. Be aware of any hazardous effects of contact with
your process fluid.
The H38/3200D has a 10 mm (3/8”) inlet and outlet and is
designed for flows up to 7.6 lpm (2 gpm). The single piece
center section is made of aluminum. The air valve is made
of polypropylene. Its air distribution system is based on a
revolutionary design, which offers economical reliability and
performance.
TOOLS REQUIRED:
5 mm (3/16”) Hex Head Wrench
Snap Ring Pliers
O-ring Pick
Step 1. Figure 1
Using a 5 mm (3/16”) hex head wrench, loosen air valve
bolts.
Step 2. Figure 2
Remove muffler plate and air valve
bolts from air valve assembly exposing
muffler gasket for inspection. Replace if
necessary.
WIL-11181-E-04 11 WILDEN PUMP & ENGINEERING, LLC
Step 3. Figure 3
Inspect air valve gasket and replace if
necessary.
Step 4. Figure 4
Remove air valve end cap to expose air
valve spool by simply lifting up on air
valve end cap, once air valve bolts are
removed.
Page 14
Step 5. Figure 5
Remove air valve spool from air valve
body by threading one of the air valve
bolt into the end of the spool and gently
slide the spool from the air valve body.
Inspect seals for signs of wear and
replace entire assembly if necessary.
Use caution when handling air valve
spool to prevent damaging seals.
NOTE: Seals should not be removed
from assembly. Seals are not sold
separately.
Step 6. Figure 6
Remove pilot spool sleeve retaining snap
ring on both sides of center section with
snap ring pliers.
Step 7. Figure 7
Remove pilot spool assembly from
center section.
Step 8. Figure 8
With O-ring pick, gently remove the
O-ring from the opposite side of the
“notched end” cut on the spool. Gently
remove the pilot spool from sleeve and
inspect for nicks or gouges and other
signs of wear. Replace pilot spool
sleeve assembly or outer sleeve O-rings
if necessary. During reassembly, never
insert the pilot spool into the sleeve with
the “notched end” side first, this end
incorporates the urethane anti-double
shifting O-ring and will be damaged as it
slides over the ports cut in the sleeve.
WILDEN PUMP & ENGINEERING, LLC 12 WIL-111 81- E- 04
Step 9. Figure 9
Using an O-ring pick, remove the antidouble shifting O-ring located at the
“notched end” of the pilot spool and
replace, if necessary. CAUTION: When
installing a new anti-double shifting Oring, be sure to do so promptly. Leaving
the pilot spool out of the sleeve for more
than a few minutes may allow the “energized” seals to grow in size, making reinsertion impossible.
Step 10. Figure 10
Check center section Glyd™ rings for
signs of wear. If necessary, remove
Glyd™ rings with O-ring pick and
replace.
Page 15
Section 5
REASSEMBLY HINTS & TIPS
ASSEMBLY:
Upon performing applicable maintenance to the air distribution
system, the pump can now be reassembled. Please refer to
the disassembly instructions for photos and parts placement.
To reassemble the pump, follow the disassembly instructions in
reverse order. The air distribution system needs to be assembled first, then the wetted path. Please find the applicable
torque specifications on this page. The following tips will assist
in the assembly process.
• Clean the inside of the center section shaft bore to ensure
no damage is done to new seals.
• Stainless bolts should be lubed to reduce the possibility of
seizing during tightening.
• Apply a small amount of Loctite
threads.
• To aid in removal of the liquid chambers, place pump on
its side.
MAXIMUM TORQUE SPECIFICATIONS
Description of Part Torque
Air Valve, Pro-Flo
Combo Manifold Plate 13.5 N•m [10 ft.-lbs.]
Liquid Chamber 13.5 N•m [10 ft.-lbs.]
®
®
242 to the shaft stud
2.8 N•m [25 in.-lbs.]
WIL-11181-E-04 13 WILDEN PUMP & ENGINEERING, LLC
Page 16
Section 7
EXPLODED VIEW & PARTS LISTING
H38 /3200D Metal
EXPLODED VIEW
WILDEN PUMP & ENGINEERING, LLC 14 WIL-111 81- E- 04
Page 17
Section 5
EXPLODED VIEW & PARTS LISTING
H38 /3200D Metal
Item # Part Description
1 Assembly, Pro-Flo Air Valve 1 01-2010-20
2 End Cap, Air Valve 1 01-2332-20
3 O-Ring -126 (Ø1.364 x Ø.103) End Cap 1 01-2395-52
4 Gasket, Air Valve 1 01-2615-52
5 Plate, Muffler 1 01-3181-20
6 Gasket, Muffler Plate 1 01-3505-52
7 Screw, SHC 1/4-20 x 3” 4 01-6001-03
8 Muffler 1 02-3510-99
9 Assembly, Center Section 1 95-3144-01
10 Ring II, Glyd 2 01-3220-55
11 Assembly, Pilot Spool 1 01-3880-99
12 O-Ring -009 (Ø.208 x Ø.070) Pilot Spool 2 04-2650-49-700
13 Ring ,Retaining 2 00-2650-03
14 Shaft 1 95-3800-03
15 Stud, 5/16-18 x 1.38” Threaded 2 01-6150-03
16 Chamber, Liquid 2 95-5001-01
17 Piston, Liquid 2 95-3728-09
18 Piston, Power R3200D 2 95-3725-01
19 Kit, Piston Seal 2 95-9211-99
20 Plate, Combo Manifold 4 95-5050-01
21
O-Ring -214 (Ø.984 x Ø.139) Manifold O-ring
22 Seat, Valve 4 95-1120-03
23
O-Ring -017 (Ø.676 x Ø.070) Valve Seat O-ring
24 Ball, Valve 4 95-1080-03
25 Cage, Ball 4 95-5350-03
26 Fitting, 37° Flared Elbow 4 95-7831-08
27 Assembly, 3/8” O.D. SS Tube 4 95-7511-03
28 Fitting, 37° Flared Tee 2 95-7870-08
29 Screw, 5/16-18 x 1” SHC 28 95-6011-08
30 Assembly, Tube & Fitting 2 95-9231-99
31 Foot 2 95-5540-01
32 Screw, 5/16-18 x 1/2” SHC 4 08-6031-08-60R
All boldface items are primary wear items
Qty per
Pump Part Number
4 04-2390-52
4 00-2390-52-700
PARTS LISTING
WIL-11181-E-04 15 WILDEN PUMP & ENGINEERING, LLC
Page 18
NOTES
Page 19
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