Graco Husky D71 Series Operation manual

Instructions – Parts List
GRACO INC.ąP.O. BOX 1441ąMINNEAPOLIS, MNą55440-1441
Copyright 1994, Graco Inc. is registered to I.S. EN ISO 9001
ACETAL, POLYPROPYLENE, AND KYNAR
Huskyt1040 Air-Operated
Diaphragm Pumps
Acetal Model Shown
120 psi (0.8 MPa, 8 bar) Maximum Fluid Working Pressure
120 psi (0.8 MPa, 8 bar) Maximum Air Input Pressure
*Model No. D71 Acetal Pumps
*Model No. D81 Acetal Pumps, Remote
*Model No. D72 Polypropylene Pumps
*Model No. D82 Polypropylene Pumps, Remote
*Model No. D75 KynarPumps
*Model No. D85 KynarPumps, Remote
*Model No. DR2 Polypropylene Plus
Pumps
*Model No. DS2 Polypropylene Plus
Pumps, Remote
*Model No. DR5 KynarPlus Pumps
*Model No. DS5 KynarPlus
Pumps, Remote
*NOTE: Refer to the Pump Matrix on page 24 to
determine the Model No. of your pump.
NOTE: Plus Models include stainless steel
center sections.
US and Foreign Patents Pending
308443S
Read warnings and instructions.
See page 2 for table of contents
04155B
Parts

2 308443
Table of Contents
Safety Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service
Repairing the Air Valve 16. . . . . . . . . . . . . . . . . . . . . .
Ball Check Valve Repair 18. . . . . . . . . . . . . . . . . . . . .
Diaphragm Repair 19. . . . . . . . . . . . . . . . . . . . . . . . . .
Bearing and Air Gasket Removal 22. . . . . . . . . . . . .
Pump Matrix 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Kit Matrix 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensional Drawings 30. . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data and Performance Chart 31. . . . . . . . . . .
Graco Standard Warranty 34. . . . . . . . . . . . . . . . . . . . . .
Graco Information 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols
Warning Symbol
WARNING
This symbol alerts you to the possibility of serious
injury or death if you do not follow the instructions.
Caution Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
instructions.
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury.
This equipment is for professional use only.
Read all instruction manuals, tags, and labels before operating the equipment.
Use the equipment only for its intended purpose. If you are not sure, call your Graco distributor.
Do not alter or modify this equipment. Use only genuine Graco parts and accessories.
Check equipment daily. Repair or replace worn or damaged parts immediately.
Do not exceed the maximum working pressure of the lowest rated component in your system.
This equipment has a 120 psi (0.8 MPa, 8 bar) maximum working pressure at 120 psi
(0.8 MPa, 8 bar) maximum incoming air pressure.
Use fluids and solvents which are compatible with the equipment wetted parts. Refer to the
Technical Data section of all equipment manuals. Read the fluid and solvent manufacturer’s
warnings.
Do not use hoses to pull equipment.
Route hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not ex-
pose Graco hoses to temperatures above 82C (180F) or below –40C (–40F).
Do not lift pressurized equipment.
Comply with all applicable local, state, and national fire, electrical, and safety regulations.
INSTRUCTIONS
WARNING

308443 3
TOXIC FLUID HAZARD
Hazardous fluid or toxic fumes can cause serious injury or death if splashed in the eyes or on the
skin, inhaled, or swallowed.
Know the specific hazards of the fluid you are using.
Store hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,
state and national guidelines.
Always wear protective eyewear, gloves, clothing and respirator as recommended by the fluid
and solvent manufacturer.
Pipe and dispose of the exhaust air safely, away from people, animals, and food handling areas.
If the diaphragm fails, the fluid is exhausted along with the air. See Air Exhaust Ventilation on
page 10.
To pump acids, always use a Kynaror a polypropylene pump. Take precautions to avoid acid
or acid fumes from contacting the pump housing exterior. Stainless steel parts will be damaged
by exposure to acid spills and fumes. Never use an acetal pump to pump acids.
FIRE AND EXPLOSION HAZARD
Improper grounding, poor ventilation, open flames or sparks can cause a hazardous condition and
result in a fire or explosion and serious injury.
Ground the equipment. Refer to Grounding on page 5.
Never use a polypropylene or Kynarpump with non-conductive flammable fluids as specified
by your local fire protection code. Refer to Grounding on page 5 for additional information.
Consult your fluid supplier to determine the conductivity or resistivity of your fluid.
If there is any static sparking or you feel an electric shock while using this equipment, stop
pumping immediately. Do not use the equipment until you identify and correct the problem.
Provide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid
being pumped.
Pipe and dispose of the exhaust air safely, away from all sources of ignition. If the diaphragm
fails, the fluid is exhausted along with the air. See Air Exhaust Ventilation on page 10.
Keep the work area free of debris, including solvent, rags, and gasoline.
Electrically disconnect all equipment in the work area.
Extinguish all open flames or pilot lights in the work area.
Do not smoke in the work area.
Do not turn on or off any light switch in the work area while operating or if fumes are present.
Do not operate a gasoline engine in the work area.
WARNING

4 308443
Installation
General Information
The Typical Installation shown in Fig. 2 is only a
guide for selecting and installing system compo-
nents. Contact your Graco distributor for assistance
in planning a system to suit your needs.
Always use Genuine Graco Parts and Accessories.
Reference numbers and letters in parentheses refer
to the callouts in the figures and the parts lists on
pages 26 to 27.
TOXIC FLUID HAZARD
Hazardous fluid or toxic fumes can
cause serious injury or death if splashed
in the eyes or on the skin, inhaled, or
swallowed.
Read TOXIC FLUID HAZARD on page 3.
Use fluids and solvents that are compatible with
the equipment wetted parts. Refer to the Tech-
nical Data section of all equipment manuals.
Read the fluid and solvent manufacturer’s
warnings.
WARNING
Tightening Screws Before First Use
After you unpack the pump, and before you use it for
the first time, check and retorque external fasteners.
Retorque the fluid cover screws first, then the manifold
screws. This keeps the manifolds from interfering with
tightening the fluid covers. See the Service section for
torque specifications.
After the first day of operation, check and retorque the
fasteners again. Although the recommended
frequency for retorquing fasteners varies with pump
usage, a general guideline is to retorque fasteners
every two months.

308443 5
Installation
Grounding
WARNING
FIRE AND EXPLOSION HAZARD
This pump must be grounded. Before
operating the pump, ground the system
as explained below. Also read the sec-
tion FIRE AND EXPLOSION HAZARD
on page 3.
The acetal pump contains stainless steel fibers
which make the wetted parts conductive. Attaching
the ground wire to the grounding strip will ground
the air motor and the wetted parts.
The polypropylene and Kynar pumps are not
conductive. Attaching the ground wire to the
grounding strip will ground only the air motor. When
pumping conductive flammable fluids, always
ground the entire fluid system by making sure the
fluid system has an electrical path to a true earth
ground (see Fig. 2). Never use a polypropylene or
Kynar pump with non-conductive flammable fluids
as specified by your local fire protection code.
US Code (NFPA 77 Static Electricity) recommends
a conductivity greater than 50 x 10–12 Siemans/me-
ter (mhos/meter) over your operating temperature
range to reduce the hazard of fire. Consult your
fluid supplier to determine the conductivity or
resistivity of your fluid. The resistivity must be less
than 2 x 1012 ohm-centimeters.
NOTE: When pumping conductive flammable fluids
with a polypropylene or Kynar pump, always ground
the fluid system. See the WARNING above. Fig. 2
shows a recommended method of grounding flam-
mable fluid containers during filling. This is only a
guide; contact your Graco distributor for assistance in
grounding your system.
Ground all of this equipment:
Pump: Connect a ground wire and clamp as shown
in Fig. 1. Loosen the grounding screw (W). Insert
one end of a 12 ga (1.5 mm) minimum ground wire
(Y) behind the grounding screw and tighten the
screw securely. Connect the clamp end of the
ground wire to a true earth ground. Order Part No.
222011 Ground Wire and Clamp.
02646B
Fig. 1
Y
W
Air and fluid hoses: Use only grounded hoses with
a maximum of 500 ft (150 m) combined hose
length to ensure grounding continuity.
Air compressor: Follow the manufacturer’s recom-
mendations.
All solvent pails used when flushing: Follow the
local code. Use only grounded metal pails, which
are conductive. Do not place the pail on a non-con-
ductive surface, such as paper or cardboard, which
interrupts the grounding continuity.
Fluid supply container: Follow the local code.

6 308443
Installation
Air Line
WARNING
A bleed-type master air valve (B) is required in
your system to relieve air trapped between this
valve and the pump. Trapped air can cause the
pump to cycle unexpectedly, which could result in
serious injury, including splashing in the eyes or on
the skin, injury from moving parts, or contamination
from hazardous fluids. See Fig. 2.
1. Install the air line accessories as shown in Fig. 2.
Mount these accessories on the wall or on a
bracket. Be sure the air line supplying the acces-
sories is grounded.
a. Install an air regulator (C) and gauge to control
the fluid pressure. The fluid outlet pressure will
be the same as the setting of the air regulator.
b. Locate one bleed-type master air valve (B)
close to the pump and use it to relieve trapped
air. See the WARNING at left. Locate the other
master air valve (E) upstream from all air line
accessories and use it to isolate them during
cleaning and repair.
c. The air line filter (F) removes harmful dirt and
moisture from the compressed air supply.
2. Install a grounded, flexible air hose (A) between
the accessories and the 1/2 npt(f) pump air inlet
(N). See Fig. 2. Use a minimum 3/8” (10 mm) ID
air hose. Screw an air line quick disconnect cou-
pler (D) onto the end of the air hose (A), and screw
the mating fitting into the pump air inlet snugly. Do
not connect the coupler (D) to the fitting until you
are ready to operate the pump.
KEY
A Air supply hose
B Bleed-type master air valve
(required for pump)
C Air regulator
D Air line quick disconnect
E Master air valve (for accessories)
F Air line filter
G Fluid suction line
H Fluid supply
J Fluid drain valve (required)
K Fluid shutoff valve
L Fluid line
N 1/2 npt(f) air inlet port
R 1” fluid inlet port
S 1” fluid outlet port
Y Ground wire (required; see page 5
for installation instructions)
Fig. 2
FLOOR MOUNT TYPICAL INSTALLATION
Y
J
FB
EC
A
DK
L
G
H
R
SN
04170B

308443 7
Installation
Mountings
CAUTION
The pump exhaust air may contain contaminants.
Ventilate to a remote area if the contaminants
could affect your fluid supply. See Air Exhaust
Ventilation on page 10.
1. Be sure the mounting surface can support the
weight of the pump, hoses, and accessories, as
well as the stress caused during operation.
2. For all mountings, be sure the pump is bolted
directly to the mounting surface.
3. For ease of operation and service, mount the
pump so the air valve cover (2), air inlet, and fluid
inlet and outlet ports are easily accessible.
4. Rubber Foot Mounting Kit 236452 is available to
reduce noise and vibration during operation.
Installation of Remote Pilot Air Lines
1. Refer to Parts Drawings. Connect air line to pump
as in preceding steps.
2. Connect 1/4 in. O.D. tubing to push type connec-
tors (14) on air motor of pump.
NOTE: by replacing the push type connectors, other
sizes or types of fittings may be used. The new fittings
will require 1/8 in. npt threads.
3. Connect remaining ends of tubes to external air
signal, such as Graco’s Cycleflo (P/N 195264) or
Cycleflo II (P/N195265) controllers.
NOTE: the air pressure at the connectors must be at
least 30% of the air pressure to the air motor for the
pump to operate.
Fluid Suction Line
If using a conductive (Acetal) pump, use conductive
hoses (G). If using a non-conductive (polypropy-
lene or Kynar) pump, ground the fluid system. See
Grounding on page 5.
The pump fluid inlet (R) is a 1” raised face flange.
See Flange Connections on page 8.
If the fluid inlet pressure to the pump is more than
25% of the outlet working pressure, the ball check
valves will not close fast enough, resulting in ineffi-
cient pump operation.
At inlet fluid pressures greater than 15 psi
(104 kPa, 1 bar), diaphragm life will be shortened.
See the Technical Data on page 31 for maximum
suction lift (wet and dry).
Fluid Outlet Line
WARNING
A fluid drain valve (J) is required to relieve pres-
sure in the hose if it is plugged. The drain valve
reduces the risk of serious injury, including splash-
ing in the eyes or on the skin, or contamination
from hazardous fluids when relieving pressure.
Install the valve close to the pump fluid outlet. See
Fig. 2.
1. Use grounded fluid hoses (L). The pump fluid
outlet (S) is a 1” raised face flange. Refer to
Flange Connections on page 8.
2. Install a fluid drain valve (J) near the fluid outlet.
See the WARNING above.
3. Install a shutoff valve (K) in the fluid outlet line.

8 308443
Installation
Flange Connections
The fluid inlet and outlet ports are 1” raised face
flanges. Connect 1” flanged plastic pipe to the pump
as follows. You will need:
Torque wrench
Adjustable wrench
One 4.25” diameter, 1/8” thick gasket, with
four 0.62 diameter holes and a 1.15” diameter
center
Four 1/2” x 2.5” bolts
Four 1/2” spring lockwashers
Eight 1/2” flat washers
Four 1/2” nuts.
1. Place a lockwasher and a flat washer on each bolt.
Refer to Fig. 3.
2. Align the holes in the gasket and the pipe flange
with the holes in the pump flange.
3. Lubricate the threads of the four bolts. Install the
bolts through the holes and secure with the wash-
ers and nuts.
4. Hold the nuts with a wrench. Refer to the tighten-
ing sequence in Fig. 3 and torque the bolts to
10 to 15 ft-lb (14 to 20 N-m). Do not over-torque.
Fig. 3
1
04405
KEY
A Flanged plastic pipe
Bgasket
C Bolt
D Lockwasher
E Flat washer
F Nut
R 1” fluid inlet flange
S 1” fluid outlet flange
A
B
C
D
E
E
F
S
R
Torque to 10 to 15 ft-lb (14-20 N-m).
Do not over-torque.
1
2
3
4
1
BOLT TIGHTENING SEQUENCE
1
04404B
PTFE
PTFE

308443 9
Installation
Changing the Orientation of the Fluid Inlet
and Outlet Ports
The pump is shipped with the fluid inlet (R) and outlet
(S) ports facing the same direction. See Fig. 4. To
change the orientation of the inlet and/or outlet port:
1. Remove the screws (106 or 112) holding the inlet
(102) and/or outlet (103) manifold to the covers
(101).
2. Reverse the manifold and reattach. Install the
screws (106 or 112). Torque the manifold screws
to 80 to 90 in-lb (9 to 10 N-m). See Fig. 4.
Fig. 4
1
KEY
N 1/2 npt(f) air inlet port
P Muffler; air exhaust port
is 3/4 npt(f)
R 1” fluid inlet port
S 1” fluid outlet port
101 Covers
102 Fluid inlet manifold
103 Fluid outlet manifold
106 Manifold screws
112 Manifold screws
N
P
R
S
1
Acetal Model Shown
103
102
101
112
106
Torque to 80 to 90 in-lb (9 to 10 N-m).
1
04155B
Fluid Pressure Relief Valve
Some systems may require installation of a pres-
sure relief valve at the pump outlet to prevent
overpressurization and rupture of the pump or
hose. See Fig. 5.
Thermal expansion of fluid in the outlet line can
cause overpressurization. This can occur when
using long fluid lines exposed to sunlight or ambi-
ent heat, or when pumping from a cool to a warm
area (for example, from an underground tank).
Overpressurization can also occur if the Husky
pump is being used to feed fluid to a piston pump,
and the intake valve of the piston pump does not
close, causing fluid to back up in the outlet line.
CAUTION
04228B
Fig. 5
1
2Connect fluid inlet line here.
KEY
R 1” fluid inlet port
S 1” fluid outlet port
V Pressure relief valve
Part No. 110134 (aluminum)
Part No. 112119 (stainless steel)
R
S
Connect fluid outlet line here.
1
2
3
Install valve between fluid inlet and outlet ports.
V
3

10 308443
Installation
Air Exhaust Ventilation
FIRE AND EXPLOSION HAZARD
Be sure to read FIRE OR EXPLOSION
HAZARD and TOXIC FLUID HAZARD
on page 3, before operating this pump.
Be sure the system is properly ventilated
for your type of installation. You must
vent the exhaust to a safe place, away from peo-
ple, animals, food handling areas, and all sources
of ignition when pumping flammable or hazardous
fluids.
When pumping flammable fluids, always use an
acetal pump. The acetal pump contains stainless
steel fibers and is more conductive than polypropy-
lene or Kynarpumps. Never use polypropylene
or Kynarpumps with flammable fluids.
Diaphragm failure will cause the fluid being
pumped to exhaust with the air. Place an appropri-
ate container at the end of the air exhaust line to
catch the fluid. See Fig. 6.
WARNING The air exhaust port is 3/4 npt(f). Do not restrict the air
exhaust port. Excessive exhaust restriction can cause
erratic pump operation.
To provide a remote exhaust:
1. Remove the muffler (P) from the pump air exhaust
port.
2. Install a grounded air exhaust hose (T) and con-
nect the muffler (P) to the other end of the hose.
The minimum size for the air exhaust hose is 3/4
in. (19 mm) ID. If a hose longer than 15 ft (4.57 m)
is required, use a larger diameter hose. Avoid
sharp bends or kinks in the hose. See Fig. 6.
3. Place a container (U) at the end of the air exhaust
line to catch fluid in case a diaphragm ruptures.
Fig. 6
KEY
A Air supply line
B Bleed-type master air valve
(required for pump)
C Air regulator
D Air line quick disconnect
E Master air valve (for accessories)
F Air line filter
P Muffler
T Grounded air exhaust hose
U Container for remote air exhaust
FBEC
A
D
VENTING EXHAUST AIR
P
T
U
04168A

308443 11
Operation
Pressure Relief Procedure
PRESSURIZED EQUIPMENT HAZARD
The equipment stays pressurized until pressure is
manually relieved. To reduce the risk of serious
injury from pressurized fluid, accidental spray from
the gun or splashing fluid, follow this procedure
whenever you
Are instructed to relieve pressure
Stop pumping
Check, clean, or service any system equipment
Install or clean fluid nozzles
WARNING
1. Shut off the air to the pump.
2. Open the dispensing valve, if used.
3. Open the fluid drain valve to relieve all fluid pres-
sure, having a container ready to catch the drain-
age.
Flush the Pump Before First Use
The pump was tested in water. If the water could
contaminate the fluid you are pumping, flush the pump
thoroughly with a compatible solvent. Follow the steps
under Starting and Adjusting the Pump.
Starting and Adjusting the Pump
TOXIC FLUID HAZARD
Hazardous fluid or toxic fumes can
cause serious injury or death if splashed
in the eyes or on the skin, inhaled, or
swallowed. Do not lift a pump under pressure. If
dropped, the fluid section may rupture. Always fol-
low the Pressure Relief Procedure above before
lifting the pump.
WARNING
1. Be sure the pump is properly grounded. Refer to
Grounding on page 5.
2. Check all fittings to be sure they are tight. Be sure
to use a compatible liquid thread sealant on all
male threads. Tighten the fluid inlet and outlet
fittings securely. Retorque all fasteners before
startup.
3. Place the suction tube (if used) in the fluid to be
pumped.
NOTE: If the fluid inlet pressure to the pump is more
than 25% of the outlet working pressure, the ball check
valves will not close fast enough, resulting in inefficient
pump operation.
4. Place the end of the fluid hose (L) into an appropri-
ate container.
5. Close the fluid drain valve (J). See Fig. 2.
6. With the pump air regulator (C) closed, open all
bleed-type master air valves (B, E).
7. If the fluid hose has a dispensing device, hold it
open while continuing with the following step.
8. Slowly open the air regulator (C) until the pump
starts to cycle. Allow the pump to cycle slowly until
all air is pushed out of the lines and the pump is
primed.
If you are flushing, run the pump long enough to
thoroughly clean the pump and hoses. Close the
air regulator. Remove the suction tube from the
solvent and place it in the fluid to be pumped.

12 308443
Operation
Operation of Remote Piloted Pumps
1. Follow preceding steps 1 through 7 of Starting
and Adjusting Pump.
2. Open air regulator (C).
WARNING
The pump may cycle once before the external sig-
nal is applied. Injury is possible. If pump cycles,
wait until end before proceeding.
3. Pump will operate when air pressure is alternately
applied and relieved to push type connectors (14).
NOTE: Leaving air pressure applied to the air motor for
extended periods when the pump is not running may
shorten the diaphragm life. Using a 3–way solenoid
valve to automatically relieve the pressure on the air
motor when the metering cycle is complete prevents
this from occurring.
Pump Shutdown
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure at left.
At the end of the work shift, relieve the pressure.

308443 13
Maintenance
Lubrication
The air valve is designed to operate unlubricated,
however if lubrication is desired, every 500 hours of
operation (or monthly) remove the hose from the pump
air inlet and add two drops of machine oil to the air
inlet.
CAUTION
Do not over-lubricate the pump. Oil is exhausted
through the muffler, which could contaminate your
fluid supply or other equipment. Excessive lubrica-
tion can also cause the pump to malfunction.
Flushing and Storage
Flush the pump often enough to prevent the fluid you
are pumping from drying or freezing in the pump and
damaging it. Always flush the pump and follow the
Pressure Relief Procedure on page 11 before storing
it for any length of time. Use a compatible solvent.
Tightening Threaded Connections
Before each use, check all hoses for wear or damage,
and replace as necessary. Check to be sure all
threaded connections are tight and leak-free. Check
and retorque all threaded connections at least every
two months. Retorque the fluid cover screws first,
followed by the manifold screws.
The recommended frequency for retorquing of fasten-
ers varies with pump usage; a general guideline is to
retorque fasteners every two months.
Preventive Maintenance Schedule
Establish a preventive maintenance schedule, based
on the pump’s service history. This is especially impor-
tant for prevention of spills or leakage due to dia-
phragm failure.

14 308443
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.
1. Relieve the pressure before checking or servicing
the equipment.
2. Check all possible problems and causes before
disassembling the pump.
PROBLEM CAUSE SOLUTION
Pump cycles at stall or fails to hold
pressure at stall.
Worn check valve balls (301), seats
(201) or o-rings (202).
Replace. See page 18.
Pump will not cycle, or cycles once
and stops.
Air valve is stuck or dirty. Disassemble and clean air valve.
See pages 16 to 17. Use filtered air.
Check valve ball (301) severely
worn and wedged in seat (201) or
manifold (102 or 103).
Replace ball and seat. See page
18.
Check valve ball (301) is wedged
into seat (201), due to overpressur-
ization.
Install Pressure Relief Valve
(see page 9).
Dispensing valve clogged. Relieve pressure and clear valve.
Pump operates erratically. Clogged suction line. Inspect; clear.
Sticky or leaking balls (301). Clean or replace. See page 18.
Diaphragm ruptured. Replace. See pages 19 to 21.
Restricted exhaust. Remove restriction.
Air bubbles in fluid. Suction line is loose. Tighten.
Diaphragm ruptured. Replace. See pages 19 to 21.
Loose inlet manifold (102), dam-
aged seal between manifold and
seat (201), damaged o-rings (202).
Tighten manifold bolts (106 or 112)
or replace seats (201) or o-rings
(202). See page 18.
Loose fluid side plate (105). Tighten or replace (pages 19 to 21).
Damaged o-ring (108). Replace. See pages 19 to 21.

308443 15
Troubleshooting
PROBLEM CAUSE SOLUTION
Fluid in exhaust air. Diaphragm ruptured. Replace. See pages 19 to 21.
Loose fluid side plate (105). Tighten or replace (pages 19 to 21).
Pump exhausts excessive air at
stall.
Worn air valve block (7), o-ring (6),
plate (8), pilot block (18), u-cups
(10), or pilot pin o-rings (17).
Repair or replace. See pages
16 to 17.
Worn shaft seals (402). Replace. See pages 19 to 21.
Pump leaks air externally. Air valve cover (2) or air valve cover
screws (3) are loose.
Tighten screws. See page 17.
Air valve gasket (4) or air cover
gasket (22) is damaged.
Inspect; replace. See pages
16 to 17 and 22 to 23.
Air cover screws (25) are loose. Tighten screws. See pages
22 to 23.
Pump leaks fluid externally from ball
check valves.
Loose manifolds (102, 103), dam-
aged seal between manifold and
seat (201), damaged o-rings (202).
Tighten manifold bolts (106 or 112)
or replace seats (201) or o-rings
(202). See page 18.

16 308443
Service
Repairing the Air Valve
Tools Required
Torque wrench
Torx (T20) screwdriver or 7 mm (9/32”) socket
wrench
Needle-nose pliers
O-ring pick
Lithium base grease
NOTE: Air Valve Repair Kit 236273 is available. Refer
to page 26. Parts included in the kit are marked with a
symbol, for example (4). Use all the parts in the kit for
the best results.
Disassembly
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.
1. Relieve the pressure.
2. With a Torx (T20) screwdriver or 7 mm (9/32”)
socket wrench, remove the six screws (3), air
valve cover (2), and gasket (4). See Fig. 7.
3. Move the valve carriage (5) to the center position
and pull it out of the cavity. Remove the valve
block (7) and o-ring (6) from the carriage. Using a
needle-nose pliers, pull the pilot block (18) straight
up and out of the cavity. See Fig. 8.
4. Pull the two actuator pistons (11) out of the bear-
ings (12). Remove the u-cup packings (10) from
the pistons. Pull the pilot pins (16) out of the
bearings (15). Remove the o-rings (17) from the
pilot pins. See Fig. 9.
5. Inspect the valve plate (8) in place. If damaged,
use a Torx (T20) screwdriver or 7 mm (9/32”)
socket wrench to remove the three screws (3).
Remove the valve plate (8) and seal (9). See Fig.
10.
6. Inspect the bearings (12, 15) in place. See Fig. 9.
The bearings are tapered and, if damaged, must
be removed from the outside. This requires disas-
sembly of the fluid section. See page 22.
7. Clean all parts and inspect for wear or damage.
Replace as needed. Reassemble as explained on
page 17.
Torque to 50–60 in-lb
(5.6–6.8 N-m).
Fig. 7
32
4
2
2
04164B
04165
18
5
Fig. 8
1
2
See Detail at right.
Grease.
3Grease lower face.
1
7
6
5
2
3
3
11
16

308443 17
Service
04159
Fig. 9
1716
11
10
12
15
1
2
Insert narrow end first.
Grease.
3Install with lips facing narrow end of piston (11).
4Insert wide end first.
1
2
3
4
2
04160
1
2
8
9
3
Rounded side must face down.
Tighten screws until
they bottom out on the
housing.
Fig. 10
1
2
Reassembly
1. If you removed the bearings (12, 15), install new
ones as explained on page 22. Reassemble the
fluid section.
2. Install the valve plate seal (9) into the groove at
the bottom of the valve cavity. The rounded side of
the seal must face down into the groove. See
Fig. 10.
3. Install the valve plate (8) in the cavity. The plate is
reversible, so either side can face up. Install the
three screws (3), using aTorx (T20) screwdriver or
7 mm (9/32”) socket wrench. Tighten until the
screws bottom out on the housing. See Fig. 10.
4. Install an o-ring (17) on each pilot pin (16).
Grease the pins and o-rings. Insert the pins into
the bearings (15), narrow end first. See Fig. 9.
5. Install a u-cup packing (10) on each actuator
piston (11), so the lips of the packings face the
narrow end of the pistons. See Fig. 9.
6. Lubricate the u-cup packings (10) and actuator
pistons (11). Insert the actuator pistons in the
bearings (12), wide end first. Leave the narrow
end of the pistons exposed. See Fig. 9.
7. Grease the lower face of the pilot block (18) and
install so its tabs snap into the grooves on the
ends of the pilot pins (16). See Fig. 8.
8. Grease the o-ring (6) and install it in the valve
block (7). Push the block onto the valve carriage
(5). Grease the lower face of the valve block. See
Fig. 8.
9. Install the valve carriage (5) so its tabs slip into the
grooves on the narrow end of the actuator pistons
(11). See Fig. 8.
10. Align the valve gasket (4) and cover (2) with the
six holes in the center housing (1). Secure with six
screws (3), using a Torx (T20) screwdriver or 7
mm (9/32”) socket wrench. Torque to 28 to 33 in-lb
(3.2 to 3.7 N.m). See Fig. 7.

18 308443
Service
Ball Check Valve Repair
Tools Required
Torque wrench
10 mm socket wrench
O-ring pick
Disassembly
NOTE: A Fluid Section Repair Kit is available. Refer to
page 25 to order the correct kit for your pump. Parts
included in the kit are marked with an asterisk, for
example (201*). Use all the parts in the kit for the best
results.
NOTE: To ensure proper seating of the balls (301),
always replace the seats (201) when replacing the
balls.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.
1. Relieve the pressure. Disconnect all hoses.
2. Remove the pump from its mounting.
3. Using a 10 mm socket wrench, remove the four
bolts (106) holding the outlet manifold (103) to the
fluid covers (101). See Fig. 11.
4. Remove the seats (201), balls (301), and o-rings
(202) from the manifold.
NOTE: Some models use two o-rings (202), some
models use four o-rings (202), and some models do
not use o-rings.
5. Turn the pump over and remove the inlet manifold
(102). Remove the seats (201), balls (301), and
o-rings (202) from the fluid covers (101).
Reassembly
1. Clean all parts and inspect for wear or damage.
Replace parts as needed.
2. Reassemble in the reverse order, following all
notes in Fig. 11. Assemble the ball checks exactly
as shown. The arrows (A) on the fluid covers (101)
must point toward the outlet manifold (103).
Fig. 11
1
2
Torque to 80 to 90 in-lb (9 to 10 N-m).
Arrow (A) must point toward outlet manifold (103).
106
103
101
A
201*
301*
112
102
201*
301*
2
1
1
202*
202*
3Not used on some models.
3
3
4Beveled seating surface must face ball (301).
4
4
04157B

308443 19
Service
Diaphragm Repair
Tools Required
Torque wrench
10 mm socket wrench
19 mm socket wrench
Adjustable wrench
O-ring pick
Lithium-base grease
Disassembly
NOTE: A Fluid Section Repair Kit is available. Refer to
page 25 to order the correct kit for your pump. Parts
included in the kit are marked with an asterisk, for
example (401*). Use all the parts in the kit for the best
results.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.
1. Relieve the pressure.
2. Remove the manifolds and disassemble the ball
check valves as explained on page 18.
3. Using a 10 mm socket wrench, remove the screws
(106 and 112) holding the fluid covers (101) to the
air covers (23). Pull the fluid covers (101) off the
pump. See Fig. 12.
Fig. 12
1
2
23
101
A2
B
Arrow (A) must point toward air valve (B).
You must torque the eight long screws (106) first, then the short
screws (112). Torque to 100 to 150 in-lb (11 to 17 N.m).
1112 106 1
113
04162B

20 308443
Service
4. Unscrew one outer plate (105) from the diaphragm
shaft (24). Remove one diaphragm (401), and the
inner plate (104). See Fig. 13.
NOTE: models include a diaphragm
(403) in addition to the backup diaphragm (401).
5. Pull the other diaphragm assembly and the dia-
phragm shaft (24) out of the center housing (1).
Hold the shaft flats with a 19 mm socket wrench,
and remove the outer plate (105) from the shaft.
Disassemble the remaining diaphragm assembly.
6. Inspect the diaphragm shaft (24) for wear or
scratches. If it is damaged, inspect the bearings
(19) in place. If the bearings are damaged, refer to
page 22.
7. Reach into the center housing (1) with an o-ring
pick and hook the u-cup packings (402), then pull
them out of the housing. This can be done with the
bearings (19) in place.
8. Clean all parts and inspect for wear or damage.
Replace parts as needed.
Reassembly
1. Grease the shaft u-cup packings (402*) and install
them so the lips face out of the housing (1). See
Fig. 13.
2. Grease the length and ends of the diaphragm shaft
(24), and slide it through the housing (1).
3. Assemble the inner diaphragm plates (104), dia-
phragms (401*), diaphragms (403*, if
present), and outer diaphragm plates (105) exactly
as shown in Fig. 13. These parts must be as-
sembled correctly.
4. Apply medium-strength (blue) Loctiteor equiva-
lent to the threads of the fluid-side plates (105).
Hold one of the outer plates (105) with a wrench,
and torque the other outer plate to 20 to 25 ft-lb
(27 to 34 N-m) at 100 rpm maximum. Do not
over-torque.
5. Align the fluid covers (101) and the center housing
(1) so the arrows (A) on the covers face the same
direction as the air valve (B). Secure the covers
with the screws (106 and 112), handtight. Place
the bolt caps (113*) on the longer screws (106),
and install the longer screws in the top and bottom
holes of the covers. See Fig. 12.
6. First, torque the longer screws (106) oppositely
and evenly to 100 to 150 in-lb (11 to 17 N-m),
using a 10 mm socket wrench. Then torque the
shorter screws (112).
7. Reassemble the ball check valves and manifolds
as explained on page 18.
PTFE
PTFE
PTFE