Backpack
Sprayer
Use and Care Manual
Model MS-53BPE
5G/ 20L
WARNING
Carefully Read These Instructions Before Use
013566 R0314
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APPLICATIONS & USE FOR YOUR SPRAYER
Avoid using a sprayer for general cleaning purposes if plant protection or herbicide chemicals have
already been used in the sprayer. If a sprayer has been used for plant protection or as an herbicide, clean
the sprayer completely (see cleaning section) before using.
Plant Food: Use different spray patterns for optimum foliage feeding or for fungicide and pesticide
application.
Herbicides: Reduce weeds and unwanted plants but avoid using the same sprayer for plant feeding or
protection without thoroughly cleaning (see cleaning section) the sprayer first.
General Household Use: Apply detergents, cleaning solutions, warm water (do not exceed
120°F/49°C) or nontoxic household cleaning chemicals for carpets, floors, walls, glass, counter tops and
ceilings. DO NOT use sprayer that has been used with herbicides, pesticides or other toxic chemicals for
household applications.
General Outdoor Use: Use the sprayer for cleaning windows or with a detergent for general purpose
cleaning.
NOZZLE ASSEMBLY
Figure 1-2
Unscrew the nozzle cap (1) from the nozzle body (3) with retaining nut (2) fastened tightly to the elbow
(5). Unscrew the retaining nut (2). Push the nozzle body (3) with the nozzle gasket (4) out of the retain-
ing nut (2). To reinstall the nozzle, reverse the above instructions.
Figure 3
Unscrew the retaining nut from the elbow and push the fan nozzle tip and gasket out of the retaining nut.
To reinstall the nozzle, reverse the above instructions.
1. Poly
Nozzle Cap
1. Brass
Nozzle Cap
2. Retaining
Nut
2. Retaining
Nut
Retaining Nut
Fan Nozzle Tip
3. Nozzle
Body
3. Nozzle
Body
Nozzle
Gasket
4. Nozzle
Gasket
4. Nozzle
Gasket
Elbow
5. Elbow
5. Elbow
Figure 1
Figure 2
Figure 3
2E
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SPRAYER COMPONENTS & USE INFORMATION, Continued
WAND ASSEMBLY
1. Make sure the o-ring is installed on the end of the wand. Insert the wand into shut-off valve.
2. Turn and tighten the retaining nut clock-wise onto the shut-off valve.
O-ring
Retaining Nut
Shut-off
Valve
Wand
INSTALLING THE PUMP HANDLE
The sprayer includes all hardware necessary for installing the pump handle. Install the pump handle
into the base (A). Center the hole in the handle between the cut-out on the bottom of the tank base (B).
Push the “C” clip over the pump handle while aligning the nub on the clip with the hole in the handle
(C). Slide washer over pump linkage (short end) (D). Slide pump arm linkage (short end) through
pump handle at the bottom of the tank (D & E). Slide a second washer over the linkage and insert the
cotter pin through the hole in linkage (E). Position ball over top of pump (F). The pump assembly can
be rotated to orient the pump outlet into desired position (G). Rotate handle down until ball is seated
in top of pump (F and G). Tighten pump retainer nut (F). Do not over tighten. Press boot over retainer
nut (H). Insure pump locking nut is tight (G).
A
B
C
Pump
Handle
“C” Clip
D
E
Pump Arm
Linkage
Pump
outlet
F
G
H
Boot
Retainer
Nut
Ball
Pump
Locking Nut
3E
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SPRAYER COMPONENTS & USE INFORMATION, Continued
INSTALLING THE SHOULDER STRAP
The backpack strap is provided with multiple features including shoulder strap and waist strap
(figure 1). The top of the shoulder strap is attached to the top of the tank and is removable.
The strap attaches to the base of the sprayer by sliding the buttons into the slots until they snap
into place (Figure 2).
Shoulder
Strap
Tank Base
Strap Button
Waist
Strap
Figure 1
Figure 2
Strap Assembly
Link
Arm
Wand Clip
WAND/PUMP HANDLE
Pump
Handle Clip
The pump handle stores
vertically and sets into the
pump handle clip (Figure 1).
The wand is stored in the wand
clip (Figure 2).
Wand
Pump
Handle
Pump
Handle
Figure 1
Figure 2
FILLING THE SPRAYER
Make sure the filter basket is in place to keep debris from entering the tank.
Determine the amount of mixture needed for your application. Add the proper amount of water to
the tank. Add the proper amount of chemical to the tank (check the chemical label for proper ratio of
chemical). Stir mixture in tank with a clean utensil (like a paint stirrer). The tank will hold the 5-gallon
(20L) capacity plus the chemical.
It is not necessary to completely fill the sprayer tank with each use. You can fill the tank with only the
amount needed for each application.
Always follow the manufacturer’s instructions included on their product label.
4E
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SPRAYER COMPONENTS & USE INFORMATION, Continued
HELPFUL SPRAYING INFORMATION
Use RAPID pump strokes to prime the pump. You will know the pressure chamber is filling with liquid
when you feel firm resistance from the pump handle. The air in the pressure chamber is compressed from
repeated strokes. By pressing the hand lever on the shut-off, the valve opens. For safety lock-off feature
(no-spraying), pull up on handle and move red locking mechanism into lock-off position as shown in fig.
1. To disengage, pull up on handle and return red locking mechanism to neutral position as in fig. 3. For
lock-on feature (continuous spraying), push down on handle and move red locking mechanism into lock-
on position as shown in fig. 2. To disengage, push down on handle and return red locking mechanism to
neutral position as shown in fig. 3.
In the event that the handle becomes stuck in the lock-on (continuous spraying) position and the tank
pressure needs to be relieved, carefully open the tank and place the wand inside the tank until the
pressure is relieved.
LOCK-OFF POSITION
LOCK-ON POSITION
NEUTRAL POSITION
Locking Mechanism
Handle
Down
Handle
Up
Figure 1
Figure 2
Figure 3
For easy pump action use the END of the pump handle. The amount of liquid delivered during spraying
depends on the rate of pump stroke. The fan nozzle tip is rated at .4 gpm at 40psi. This is the nominal
operating pressure of the sprayer..
POWDER-BASED CHEMICALS
Powder-based chemicals (powder mixed with liquids to
Agitator
Bar
make the spraying agent) are usually abrasive and can
cause wear. When you use a powder-based chemical in
your sprayer, make sure it is thoroughly dissolved in the
liquid solution. Thoroughly clean and flush the sprayer
with water to extend the life of the sprayers parts.
This sprayer is equipped with an agitator bar which facili-
tates mixing as the pump is operated.
CLEANING
1) Always empty the sprayer and clean the tank thoroughly after each use.
2) Pump the sprayer handle until all of the contents and air exit through the nozzle (minimum of
30 strokes).
3) Fill tank half way with water and pump the water out as explained in step 2 (repeat several times
as necessary).
Other Cleaning Hints:
•
•
•
•
Improper spray distribution usually means the nozzle is clogged, remove the nozzle and clean it.
Soap can be added to the water to clean the tank.
Do not use strong cleaning agents or abrasives.
If you use a chemical agent to clean the tank follow the manufacturer’s recommendations for the
disposal of the waste water.
•
Follow the chemical manufacturers instructions for clean up.
5E
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STORING / MAINTAINING YOUR SPRAYER
• The sprayer should be stored out of direct sunlight in a cool dry space.
• Before freezing weather make sure to drain all liquid in the tank, pump, pressure cylinder, hose,
shut-off valve, wand and nozzle, to avoid liquid expansion and cracking in the sprayer components
(See “Cleaning” section). Lock the shut-off valve in the “open” position.
• When service is required call your nearest dealer and always insist on original manufactured
replacement parts.
• Inspect the hose, wand, pump, tank and shut-off valve for wear, damage or leaks on a regular basis
and repair defects promptly.
• Every year prior to spraying remove felt gasket (see Pump Disassembly and Rebuild) and saturate
with a light oil. Oil periodically thru out the season as needed.
TROUBLE SHOOTING YOUR SPRAYER
Symptom
Possible Reason
Correction
Shut-off leaks
Connections loose
Tighten connection
Worn or damaged shut-off
Rebuild or replace the shut-off valve
Wand assembly leaks
Connections loose
Tighten connection
Damaged or worn o-ring/gasket
Replace o-ring/gasket
Nozzle assembly leaks
Connections loose
Tighten connection
Damaged or worn o-ring/gasket
Replace o-ring/gasket
Hose leaking at shut-off
Hose leaking at pump outlet
Upward pumping action difficult
Connection loose
Damaged or worn o-ring/gasket
Tighten retaining nut
Replace o-ring/gasket
Connection loose
Damaged or worn o-ring/gasket
Tighten retaining nut
Replace o-ring/gasket
Inlet openings in bottom of piston
cylinder clogged
Remove piston cylinder and clean openings
(see section on Piston Cylinder Disassembly
and Rebuild)
Piston cylinder check valve stuck
Remove piston cylinder check valve cartridge-
Clean, rebuild or replace (see section on Piston
Cylinder Disassembly and rebuild)
Downward pumping action difficult
Pressure chamber check valve stuck
Remove piston cylinder check valve cartridge-
Clean, rebuild or replace (see section on Piston
Cylinder Disassembly and rebuild)
Decline in pump performance (cannot
achieve pressure and/or doesn’t hold
pressure)
Dirt or debris or wear in one or both
check valves
Remove both check valves and clean, rebuild
or replace (see section on Piston Cylinder
Disassembly and Rebuild and also section
on Pump Disassembly and rebuild)
Remove piston cylinder and check inside
diameter for wear- replace if necessary (see
section on Piston Cylinder Disassembly
and Rebuild)
Piston cylinder inside diameter
surface worn
Plunger cup worn
Remove pump assembly and check plunger
cup for wear-replace if necessary (see section
on Pump Disassembly and Rebuild)
Remove pump assembly and replace
pressure chamber housing (see section on
Pump Disassembly and Rebuild)
Damaged pressure chamber housing
Incorrect Assembly of plunger and/or
check valve components
Refer to section on Pump Disassembly and
Rebuild and Piston Cylinder Disassembly and
Rebuild
6E
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PUMP DISASSEMBLY AND REBUILD
Agitator
Bar
1) Insure the tank and pressure chamber contents are emptied and pressure
has been released in the pressure chamber. To release pressure in the
pressure chamber activate shut-off valve and release all pressure.
Figure 1
2) Reach into tank fill opening and remove agitator bar from pressure
chamber body (Figure 1).
Boot
Retainer
Nut
Ball
3) Disconnect linkage arm from the top of the pump assembly (see section
covering Installing The Pump Handle). (Figure 2).
Figure 2
Pressure
Chamber
4) Loosen pump locking ring and remove entire pump assembly from tank
(Figure 3).
Pump
Locking
Ring
Check Valve
Remove check valve cartridge assembly from bottom of pressure chamber
utilizing pump handle clip (clip has flat blade incorporated into end). Place
flat blade into slot in bottom of cartridge and unscrew. Once cartridge has
been removed it can either be replaced as an assembly or rebuilt. To rebuild
disassemble two halves of cartridge and replace seal and/or ball (Figure 4 and
5). The seal mounts inside the larger of the two halves of the cartridge. The
seal counterbore side mounts into the grooves in the cartridge halve. Pump
performance my be affected if this is not assembled correctly.
Figure 3
Pressure
Chamber
Plunger
Cup
Check
Valve
Plunger Cup
Pump Handle Clip
Once the check valve has been removed the plunger cup can be replaced as the
check valve housing holds the plunger cup in place to the bottom of the pressure
chamber body. The bottom of the pressure chamber body has a groove in it to
accept the raised ring on the plunger cup. It is important to insure that these
two surfaces are aligned and mated before tightening the check valve. Pump
performance may be affected if this is not assembled correctly.
Figure 4
Flat side
Seal
Ball
Counterbore Side
Figure 5
7E
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Pressure Chamber Housing Gasket and Felt Washer
Felt
Washer
Gasket
Slide both the gasket and felt washer off the pressure chamber body (Figure 6).
Replace felt washer first taking care not to fold over washer as it is worked up
the pump chamber and into the pump locking ring (figure 7). The felt washer is
pre-lubricated to provide lubrication between the pressure chamber housing and
pressure chamber housing gasket. Insure the felt washer is free of contamination
before installing. Replace gasket into the pump opening in the tank insuring
the flanged end is up (if this is assembled backwards leakage will occur) (Figure
8). Insure that the sides of the gasket are inside the tank pump opening and the
flange is sitting level on the tank pump opening seal surface area.
Figure 6
Pump
Locking
Ring
5) Replace pump assembly into tank and into the piston cylinder which is mount-
ed on the bottom of the tank. Be careful not to damage the plunger seal as it seats
into the piston cylinder. It is recommended that you view through the tank fill
opening while performing this to achieve better alignment. If necessary you can
also reach in and use your hand to guide the plunger seal into the piston cylinder.
Felt
Washer
Figure 7
Pressure Chamber
Housing Gasket
6) Position the pump outlet (hose connection) in the desired position. Tighten
the pump retaining ring onto the tank.
7) Reach into tank fill opening and attach agitator to pressure chamber body.
8) Connect linkage arm to the top of the pump assembly (see section covering
Installing The Pump Handle).
Figure 8
PUMP DISASSEMBLY AND REBUILD
Agitator
Bar
1) Insure the tank and pressure chamber contents are emptied and pressure
has been released in the pressure chamber. To release pressure in the pressure
chamber activate shut-off valve and release all pressure.
Figure 1
2) Reach into tank fill opening and remove agitator bar from pressure chamber
body (Figure 1).
Boot
Retainer
Nut
3) Disconnect linkage arm from the top of the pump assembly (see section
covering Installing The Pump Handle). (Figure2).
Ball
Figure 2
Pressure
Chamber
4) Loosen pump locking ring and remove entire pump assembly from
tank ( Figure 3).
Pump
Locking
Ring
Figure 3
8E
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5) Remove the three bolts attaching the piston cylinder to the bottom of
the tank (Figure 4).
6) Reach in through the tank fill opening and remove the piston cylinder.
Figure 4
7) Remove check valve cartridge assembly from bottom of piston cylinder
utilizing pump handle clip (clip has flat blade incorporated into end). Place
flat blade into slot in bottom of cartridge and unscrew (Figure 5 and 6).
8) Once cartridge has been removed it can either be replaced as an
assembly or rebuilt.
Piston Cylinder
Figure 5
9) To rebuild disassemble two halves of cartridge and replace seal and/
or ball. Replace cartridge (Figure 7). The seal mounts inside the larger of
the two halves of the cartridge. The seal counterbore side mounts into the
grooves in the cartridge halve. Pump performance my be affected if this is
not assembled correctly.
Check Valve
10) At this point the piston cylinder itself and/or piston cylinder stud
gaskets can be replaced. The piston cylinder stud gaskets must be oriented
correctly or leakage may result (Figure 8).
Figure 6
Flat side
Seal
Ball
11) Reassemble piston cylinder using washers and bolts on the underside of
the base.
Counterbore Side
12) Replace pump assembly into tank and into the piston cylinder which is
mounted on the bottom of the tank (see important notes regarding gasket
and felt washer in Pump and Disassembly and Rebuild section). Be careful
not to damage the plunger seal as it seats into the piston cylinder. It is
recommended that you look through the tank fill opening while performing
this to achieve better alignment. If necessary you can also reach in and use
your hand to guide the plunger seal into the piston cylinder.
Figure 7
Stud Gaskets
13) Position the pump outlet (hose connection) in the desired position.
Tighten the pump retaining ring onto the tank.
Figure 8
14) Reach into tank fill opening and attach agitator to pressure chamber
body.
15) Connect linkage arm to the top of the pump assembly (see section
covering Installing the Pump Handle)
9E
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DISASSEMBLING AND REPAIRING THE SHUT OFF VALVE
1) Assembled shut-off valve (Figure 1).
Figure 1
2) Remove the retaining pin (A) (Figure 2) place the notched end
of the retaining pin on a hard surface and push down. Remove the
retaining pin and slide the handle off the valve.
A
Figure 2
Valve
Stem
3) Remove the retaining nut (o-ring attached), spring, and valve stem (B)
(Figure 3). Replace worn parts. Lubricate the O-rings and reassemble by
reversing the steps above. Place the handle groove in the slotted area of
the valve stem and make sure the locking clip is positioned in the neutral
position (see “Helpful Spraying Information” section). Insert the retaining
pin. Push down on the handle a few times to distribute the lubricant
evenly. Check filter (C) in end of shut-off valve for debris. Remove filter
and flush with water to clean out.
B
C
Figure 3
REPLACEMENT PARTS ORDER INFORMATION
569010
569012
Flat Fan Nozzle
Brass
Adjustable
Nozzle
569013
Nozzle kit
569011
Poly
Adjustable
Nozzle
10E
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REPLACEMENT PARTS ORDER INFORMATION
569019
Link Arm Assembly
569026
Pump Handle w/clip
O-ring
99944100480
Wand
Assembly
Wand
Screw
Cap
Hose Washer
99944100479
Hose
Assembly
Retaining Nut
Hose
99944100477
Shut-off Valve
Repair Kit
99944100478
Shut-off
Assembly
11E
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REPLACEMENT PARTS ORDER INFORMATION
569021
Pump Seal Kit
569024
Piston Cylinder Kit
569028
Pressure Chamber Housing
569023
Valve cartridge kit
569020
O-ring kit
569002
Filter Basket & Cap
99944100472
Straps
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MS-53BPE MSP10000001 - MS-53BPE MSP99999999
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