Graco 5:1 Monark 952-793 Operation manual

INSTRUCTIONS - PARTS LIST 684-001
Revision G
5:1 Monark®
SANITARY PUMP
With Priming Piston
600 PSI (42 bar) MAXIMUM FLUID WORKING PRESSURE
120 PSI (8.4 bar) MAXIMUM AIR INLET PRESSURE
Model: 952-793
WARNING
Priming Piston Hazard
This pump has a priming piston which extends
below the foot valve during operation. This
piston could pinch or amputate your fingers or
hands as it oves up, into the cylinder. To reduce
the risk of injury, keep your fingers and hands
and all tools away from the priming piston during
operation and whenever the air and fluid pressure
in the pump is not fully relieved.
INDEX
Warnings .......................................... 2, 3
Typical Installation ............................ 4
Installation ........................................ 5
Operation .......................................... 5, 6
Service ............................................. 6, 7
Troubleshooting Chart ..................... 7
Displacement Pump Service ........... 7
Parts List ........................................... 8
Parts Drawings .................................. 9
Accessories ...................................... 10
Dimensional Drawing ........................ 11
Technical Data .................................. Back Cover
Warranty ........................................... Back Cover
GRACO INC. P.O. Box 1441 MINNEAPOLIS, MN 55440
©COPYRIGHT 1973, GRACO INC.
This manual contains IMPORTANT
WARNINGS and INSTRUCTIONS
READ AND RETAIN FOR REFERENCE
Parts

684-001
2
SAFETY WARNINGS
MOVING PARTS HAZARD
KEEP HANDS AND FINGERS AWAY FROM THE
PRIMING PISTON DURING OPERATION AND
WHENEVER THE PUMP IS CHARGED WITH AIR
to reduce the risk of injury! On the pump
downstroke the priming piston extends beyond the
intake cylinder to pull the material into the pump.
The priming piston works under extreme force.
During operation and whenever the pump is
charged with air, the priming piston can severely
injure or amputate a hand or finger, or break a tool
caught between it and the intake cylinder.
Always follow the Pressure Relief Procedure,
below, before checking, clearing, cleaning, flushing
or servicing any part of the pump.
The air motor piston (located behind the air motor
shield) also moves when air is supplied to the
motor. NEVER operate the pump with the air
motor shield removed. Before servicing the pump,
follow the Pressure Relief Procedure below to
prevent the pump from starting accidentally.
EQUIPMENT MISUSE HAZARD
General Safety
Any misuse of the spray equipment or accessories,
such as overpressurizing, modifying parts, using
incompatible fluids and solvent, or using worn or
damaged parts, can cause them to rupture and
result in injection or other serious bodily injury, fire,
explosion or property damage.
NEVER alter or modify any part of this equipment;
doing so could cause it to malfunction.
CHECK all spray equipment regularly and repair or
replace worn or damaged parts immediately.
Always read and follow the fluid and solvent
manufacturers recommendations regarding the use
of protective clothing and equipment.
Always shut off the power to the pump and relieve
all air and fluid pressure in the system before
checking, adjusting or repairing the system to
reduce the risk of bodily injury, including eye injury
from the unexpected release of fluid from the
system.
System Pressure
The maximum working pressure of this pump is
600 PSI (42 bar) at a maximum incoming air
pressure of 120 PSI (8.4 bar).
Never exceed the maximum working pressure of
this pump or of the lowest rated accessory in your
system.
Pressure Relief Procedure
To reduce the risk of serious bodily injury, including
fluid injection, splashing in the eyes or on the skin,
or injury from moving parts, always follow this
procedure whenever you shut off the pump, when
checking or servicing any part of the
spray/dispensing system, when installing, cleaning
or changing spray tips/nozzles, and whenever you
stop spraying/dispensing.
1. Engage the spray gun safety latch.
2. Shut off the air to the pump.
3. Close the bleed-type master air valve (required
in your system).
4. Disengage the safety latch.
5. Hold a metal part of the spray gun firmly to the
side of a grounded metal pail, and trigger the
spray gun to relieve pressure.
6. Engage the spray gun safety latch.
7. Open the drain valve and/or the pump bleeder
valve (required in your system), having a
container ready to catch the drainage.
8. Leave the drain valve open until you are ready
to spray/dispense again.
If you suspect that the spray tip/nozzle or hose is
completely clogged, or that pressure has not been
fully relieved after following the steps above,
VERY SLOWLY loosen the retaining nut or hose
end coupling and relieve pressure gradually, then
loosen completely. Now clear the tip/nozzle or
hose.

684-001 3
FIRE OR EXPLOSION HAZARD
Static electricity is created by the high velocity flow
of fluid through the pump and hose. If every part
of the spray equipment is not properly grounded,
sparking may occur, and the system may become
hazardous. Sparking may also occur when
plugging in or unplugging a power supply cord.
Sparks can ignite fumes from solvents and the
fluid being sprayed, dust particles and other
flammable substances, whether you are spraying
indoors or outdoors, and can cause a fire or
explosion and serious bodily injury and property
damage. Do not plug in or unplug any power
supply cords in the spray area when there is any
chance of igniting fumes still in the air.
Grounding
To reduce the risk of static sparking, ground the
pump and all other spray equipment used or
located in the spray area. CHECK your local
electrical code for detailed grounding instructions
for your area and type of equipment. BE SURE to
ground all of this spray equipment:
If you experience any static sparking or even a
slight shock, STOP DISPENSING IMMEDIATELY.
Check the entire system for positive grounding. Do
not use the system again until the problem has
been identified and corrected.
1.
Pump: use a ground wire and clamp as
instructed at the right.
2.
Air hoses: use only grounded air hoses.
3.
Fluid hoses: Use only grounded fluid hoses.
Check the electrical resistance of your air and
fluid hoses at least once a week. If your hose
does not have a tag on it which specifies the
electrical resistance, contact the hose supplier
or manufacturer for the resistance limits. Use
a resistance meter in the appropriate range for
your hose to check the resistance. If the
resistance exceeds the limits, replace it
immediately.
4.
Air compressors: follow the air compressor
manufacturer’s recommendations.
5.
Spray gun or dispensing valve: grounding is
obtained through connection to a properly
grounded fluid hose and pump.
6.
Object being sprayed: according to your local
code.
7.
All solvent pails used when flushing, according
to local code.
Use only metal pails, which are
conductive, placed on a grounded surface. Do
not place the pail on a non-conductive surface,
such as paper or cardboard, which interrupts
the grounding continuity.
8.
To maintain grounding continuity when flushing
or relieving pressure,
always hold a metal part
of the gun firmly to the side of a
metal pail,
then trigger the gun.
To ground the pump, connect a ground wire to the
motor grounding lug. See the illustration above.
Refer to ACCESSORIES for ordering a ground
wire and clamp. Loosen the locknut (W) of the
grounding lug (X) and washer (Y). Insert one end
of the grounding wire (12 ga minimum) (Z) into the
slot in the lug and tighten the locknut securely.
Connect the other end of the wire to a true earth
ground, as recommended by your local electric
code.
IMPORTANT
United States Government safety standards have
been adopted under the Occupational Safety and
Health Act. These standards-particularly the
General Standards, Part 1910, and the
Construction Standards, Part 1926 should be
consulted.

684-001
4
TYPICAL INSTALLATION
KEY
A. Air Exhaust Muffler or Hose
B. Exhaust Air 3/4” NPT Outlet
C. Air Filter-Regulator
D. Air Line Lubricator
E. Air Solenoid Valve
F. Supply Air 3/8” NPT Inlet
G. Bleed Type Master Air Valve (required)
H. Fluid Flanged Outlet
I. Automatic Valve
J. Ground Wire (required) (Not Shown; See Page 3 for Grounding Instructions)

684-001 5
INSTALLATION
MOUNTING PUMP
Mount pump to suit the type of installation planned.
Mounting accessories are available through your
local distributor.
This is a sanitary shovel pump. The pump is
designed to mount on a 55 gallon or 5 gallon ram
with a ram plate attached to the foot valve of the
pump. The warnings regarding MOVING PARTS
HAZARD on page 2 should be paid close attention.
Screw the air exhaust muffler (A) into the 3/4” NPT
outlet (B) in the air motor base. See the TYPICAL
INSTALLATION. If lubricants, air line scale, rust,
etc. could contaminate material, plumb exhaust air
outside of the fluid product zone.
Ground the Pump and System
Read the warning section FIRE OR EXPLOSION
HAZARD on page 3 and ground the pump and
system as explained there.
CONNECT THE HOSES
Install an accessory air filter-regulator assembly
(C), lubricator (D) and solenoid valve (E) in the
pumps 3/8” NPT air inlet (F) as shown in the
TYPICAL INSTALLATION. See page 10 for the
recommended air filter-regulator and lubricator.
Connect a 0.5” (13 mm) ID air supply hose to the
1/2” NPT inlet of the filter regulator (C). The main
air supply must include a bleed type master air
valve (G), required, for shutting off and relieving
air pressure that may be trapped between the
valve and air motor and cause it to cycle
unexpectedly.
Connect a fluid hose to the pump’s flanged outlet
(H). See the accessory sanitary hose fittings kit on
page 10.
Installation of the complete system should be in
accordance with all state sanitary codes and/or
local requirements.
Connect air solenoid valves (E) to actuating
mechanism (timer) and set so the automatic valve
(J) will dispense at proper intervals.
OPERATION
NOTE: If necessary, flush the pump with an
approved cleaning solution or disassemble and
sanitize the parts before using the pump. Refer
to the CLEANING PROCEDURE. Check local
and state codes for specific limitations.
Adjusting the Pump Speed and Pressure
WARNING
Never allow the air pressure to the pump to
exceed 120 PSI (8.4 bar). Higher pressures will
cause the pump to exceed its maximum
recommended sale operating pressure of 600
PSI (42 bar).
Before turning on the air to start the pump, fill the
lubricator bowl to the level mark with a
phosphate/ester-free SAE 10 machine oil.
With the air supply turned on, the pump starts
when the automatic dispensing valve is opened,
and stalls against pressure when the automatic
dispensing valve is closed. In a circulating system,
the pump operates until the air supply is turned off.
Always use the lowest air pressure needed to give
the desired results.
Lubrication and Care of the Pump
Do not subject the air motor to temperatures higher
than 200°F (93°C), and the immersion fluid pump
to temperatures higher that 200°F (93°C).
Excessive temperatures may damage the pump
packings and seals.
If the pump accelerates quickly, or is running too
fast, stop the pump immediately and check the
fluid supply. If the fluid supply is empty and air has
gotten in to the system, re-primer the pump and
lines with material, or flush and clean the pump
and the system. Always stop the pump at the
bottom of its stroke to prevent material from drying
on the displacement rod (the air motor exhausts at
the bottom of the stroke).

684-001
6
To shut off the pump, close the air regulator and
open the master bleed-type air valve. Trigger the
dispensing valve to relieve fluid pressure.
Shut down and Displacement Pump Cleaning
Procedure
NOTE: The pump and the system should be
cleaned in accordance with your state and
sanitary codes and local regulations.
Remove the pump from the fluid container and
operate the pump until as much of the material as
possible has been pumped out.
Flush the system thoroughly with warm cleaning
solution.
Shut off the air to the pump and relieve the fluid
pressure by opening the automatic dispensing
valve. Remove the air and fluid hoses from the
pump.
Disassemble the fluid pump and accessories.
Wash all the pump parts with an alkaline detergent
at the manufacturer’s recommended temperature
and concentration, using either a brush or other
C.O.P. methods.
Rinse all the pump parts again with water.
Allow all the pump parts to dry.
Inspect all the pump parts and reclean any soiled
parts. Any damaged rubber parts must be
replaced because they will harbor micro-
organisms.
Immerse all the pump parts and the tube of
lubricant in an approved sanitizer before assembly.
Leave the pump parts in the sanitizer during
assembly, taking them out one by one as needed.
Lubricate the moving pump parts and o-rings,
packings and seals with waterproof sanitary
lubricant.
Circulate the sanitizing solution through the pump
and the system prior to use.
SERVICE
WARNING
Moving parts can pinch or amputate your
fingers or other body parts. When the pump is
operating, the priming piston (located at the
pump intake) and the air motor piston (located
behind the air motor shield) move. Therefore,
NEVER operate the pump with the air motor
should removed, and keep your fingers and
hands away from the priming piston.
Before attempting to clear an obstruction from
the priming piston or service the pump, follow
the Pressure Relief Procedure Warning on
page 2 to prevent the pump from starting
accidentally.

684-001 7
TROUBLESHOOTING CHART
What’s Wrong
Pump fails to operate
Pump operates but - output low on both strokes
- output low on down stroke
- output low on up stroke
Erratic or accelerated operation Restricted line or inadequate air supply Clear; increase.
Insufficient air pressure - closed or
clogged air valves, etc. Open, clean.
Exhausted fluid supply Refill
Obstructed fluid line, valves, gun, etc. Clear *
Worn throat packing (8) Replace
Held open or worn fluid intake valve Clear, service
Held open or worn fluid piston or packing Clear, service
Damaged fluid pump riser tube o-rings (12) Replace
Damaged air motor Service - see
307-043
* Relieve pressures and disconnect fluid line. Turn on air; if pump starts, the line, etc. is clogged
Check all other remedies before disassembling pump
Displacement Pump Service
Use all parts of repair kit 948-147 when servicing
the pump.
Remove the pump from the fluid container and
operate it until as much of the material has been
pumped out as possible.
Shut off the air to the pump by closing the
regulator and opening the bleed-type master air
valve, and relieving the fluid pressure by triggering
the automatic dispensing valve. Remove the air
and fluid hoses from the pump.
Intake Valve
1. Remove retaining pin (28) from connecting rod
(26). Release clamp (7) to remove foot valve
cylinder (18) from pump cylinder (2).
2. Slide priming piston (27), foot valve poppet
(23), foot valve packing (29), poppet spring
(30), bearing (10) and foot valve stop (16) off
the connecting rod (26). Clean and inspect the
parts.
3. Release clamp (7) holding the retainer housing
(22) to the air motor base. Slide the pump
cylinder (2) down from the air motor. Pull the
displacement rod (3) out of the connecting rod
(21). Push the displacement rod out through
the bottom of the pump cylinder (2).
4. Remove the connecting rod (26) by removing
the retaining pin (25) and the o-ring (20) and
pulling the connecting rod (26) from the
displacement rod (3).
5. Release clamp (7) to take the retainer housing
(22) off of the pump cylinder (2). Remove
packing housing (24), bearing (17) and packing
(8) from housing retainer (22).
6. Clean and inspect all of the parts. Replace the
parts as necessary. The rubber parts that are
damaged or cut must be replaced, as any
damaged parts will harbor micro-organisms.
Reassemble the pump in the reverse from
disassembly. Sanitize all parts (see
CLEANING PROCEDURE, page 2). Lubricate
the o-rings, throat packing and piston seal with
waterproof sanitary lubricant when reassembly.
NOTE: When reinstalling the housing (22), the
hole must be slanting down.

684-001
8
PARTS LIST
MODEL: 952-793
Includes items 1-31
REF PART
NO. NO. DESCRIPTION QTY
1 207-546 AIR MOTOR
(see 307-043 for parts) 1
2 902-980 CYLINDER, pump 1
3 902-983 ROD, displacement 1
4 * 101-946 PIN, cotter; 1/8 dia; 1” lg 1
5 102-218 CLAMP, hinged; 1-1/2” 1
6 512-913 MUFFLER, air exhaust 1
7 102-657 CLAMP, hinged; 2-1/2” 3
8 ** 180-238 PACKING, “V” block 1
9 * 103-462 BALL; 3/4” dia. 1
10 ** 604-016 BEARING, 4” dia. 1
11 * 166-114 SHIELD, drip; neoprene 1
12 ** 166-117 GASKET, sanitary 3
13 ** 166-119 PACKING, o-ring; neoprene 1
14 * 166-129 SHIELD, drip; neoprene 1
15 * 166-130 GASKET, 1-1/2” dia; neoprene 1
16 604-017 STOP, foot valve 1
17 ** 180-919 BEARING, sleeve 1
18 605-570 CYLINDER, foot valve 1
19 ** 167-971 SEAL, piston; neoprene 1
20 ** 167-972 PACKING, o-ring; nitrile rubber 1
21 167-974 ROD, connecting 1
22 167-975 HOUSING, retainer 1
23 604-018 POPPET, foot valve 1
24 180-018 HOUSING, packing 1
25 169-845 PIN, retaining; piston housing 1
26 902-982 ROD, connecting 1
27 604-015 PISTON, priming 1
28 604-008 PIN, retaining 1
29 ** 603-778 PACKING, foot valve 2
30 **501-095 SPRING, ball check 1
31 172-573 PLATE, instruction 1
* Suggested “tool box” spare parts. Keep on
hand to reduce down time.
** Included in Repair Kit 948-147
948-147 REPAIR KIT
(Must be purchased separately)
REF REF.
NO. QTY NO. QTY
81 19 1
10 1 20 1
12 3 29 2
13 1 30 1
17 1
HOW TO ORDER REPLACEMENT PARTS
1. To be sure you receive the correct
replacement parts, kit or accessories, always
give all of the information requested in the
chart below.
2.
Check the parts list to identify the correct part
number;
do not use the ref. no. when
ordering.
3. Order all parts from your nearest Graco
distributor.
6 digit
PART
NUMBER QTY DESCRIPTION

684-001 9
PARTS DRAWING

684-001
10
ACCESSORIES (Must be purchased separately)
AIR EXHAUST MUFFLER 512-913
AIR LINE LUBRICATOR 214-874
250 PSI (17.5 bar) MAXIMUM WORKING PRESSURE
For automatic lubrication of air motor
3/8” NPT (F) Inlet and Outlet
AIR FILTER and REGULATOR 106-146
5-125 PSI (0.4-9 bar) Regulator Pressure
250 PSI (17 bar) MAXIMUM WORKING PRESSURE
For filtering and regulating air to pump
1/2” NPT (F) Inlet and Outlet
AIR REGULATOR & GAUGE 202-858
Air accurately controlling volume of air delivered to
pump. Inlet, 1/2” NPT (F) swivel. Outlet, 3/8” NPT (M).
See instruction manual 307-204.
METERING CONTROLS
Pneumatic controls enclosed in an optional 304
Stainless Steel splashproof enclosure available on
special order.
SANITARY DISPENSING VALVE 208-378
200 PSI (14 bar) MAXIMUM FLUID PRESSURE
50-150 PSI (3.5-10 bar) Cylinder Air Range
1,46207 ACME (M) Fluid Inlet
1/4 NPT (F) Air Inlet
See instruction manual 307-054.
SANITARY SPRAY VALVE 208-379
200 PSI (14 bar) MAXIMUM FLUID PRESSURE
50-150 PSI (3.5-10 bar) Cylinder Air Range
1.462-8 ACME Fluid Inlet
1/4 NPT (F) Air Inlet
See instruction manual 307-054
ADJUST-A-STROKE 210-516
Meters pump delivery by varying length of pump stroke.
See instruction manual 307-205.
BLEED-TYPE MASTER AIR VALVE 107-142
300 PSI (21 bar) MAXIMUM WORKING PRESSURE
Relieves air trapped in the air line between the pump air
inlet and this valve when closed. 1/2” NPT (M X F) inlet
and outlet.
DRUM COVER
Stainless steel drum cover available on special order.
Grounding Clamp 103-538
Ground Wire 208-950
25’ (7.6m) long, 12 gauge