BackpackBackpack
SprayerSprayer
Use and Care ManualUse and Care Manual
Model MS-41BP
4G/ 15L
WARNING
Carefully Read These Instructions Before Use
013529 R0514
WARNING
WARNING: Improper use or failure to follow instructions can result in explosive
failure causing serious eye or other injury. For safe use of this product you must read
and follow all instructions. Do not leave a pressurized sprayer in the hot sun. Heat can cause
pressure build-up resulting in possible explosion. Do not store or leave solution in tank after
use. Always wear goggles, gloves, long sleeve shirt, long pants and full foot protection when
spraying. Never use any tool to remove pump if there is pressure in the pressure chamber.
Never pressurize sprayer by any means other than the original pump. Do not attempt to
modify this sprayer. Replace parts only with manufacturer’s original parts. Never spray
ammable, caustic, acidic, chlorine, bleach or other corrosive solutions or
heat, pressure, or gas producing chemicals. Always read and follow chemical
manufacturer’s instructions before use with this sprayer as some chemicals may
be hazardous when used with this sprayer.
WARNING: Handling the brass parts of this product will expose you to lead, a chemical
known to the State of California to cause birth defects and other reproductive harm.
Wash hands after handling.
SK 1158-1
CAUTION
• PRE-USE CHECK: Before each use check tightness of hose nut to be sure hose is
securely attached to the shut-off assembly. Insure hose is securely attached to the
tank by tightening hose clamp if necessary. Insure that all nozzle and wand
connections are tight. Insure the large pump clamp is tight. Insure the 2 bolts
used to attach the pump lever to the pump shaft are tight.
• Do Not exceed a tank solution temperature of 120º F/ 49º C.
NOTE: The tank and hose may have residual water in it due to quality testing
performed on the sprayer.
1E
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.
SPRAYER COMPONENTS & USE INFORMATION
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
2. Retaining
Nut
4. Nozzle
Gasket
3. Nozzle
Body
5. Elbow
1. Brass
Nozzle Cap
2. Retaining
Nut
4. Nozzle
Gasket
5. Elbow
2E
3. Nozzle
Body
Retaining Nut
Nozzle
Gasket
Fan Nozzle Tip
Elbow
Figure 3Figure 2Figure 1
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.
Retaining Nut
INSTALLING THE PUMP HANDLE
The pump handle can be mounted on either side of the pump
shaft (A). To install the pump handle place the handle (C)
over the shaft (A) aligning the pump handle hole and shaft
hole. Slide the bolt (B) through the aligned hole as shown in
figure 1 thru 4. Tighten nut (D) to bolt. There are holes in the
pump handle to allow for either left(fig.4) or right (fig.5) hand
mounting.
Nylon Lock Nut
Threaded Bolt
Figure 1 Figure 2
Wand
O-ring
Line up holes
Shut-off
Valve
A
B
D
C
Figure 3
Slide bolt through holes
Figure 4
Tighten nut to bolt
Pump Handle
Positioned For Use
(right hand shown)
Figure 5
Left Hand
Figure 6
Right Hand
3E
STOWAWAY PUMP HANDLE
Pull
up
Rotate
180º
INSTALLING THE SHOULDER STRAP
The top of the shoulder straps are attached to
the tank. Attach the lower end of the straps
by clipping the strap hooks to the metal frame
between where the frame exits the tank and
curves around.
In the event that the sprayer harness (straps)
become contaminated with chemicals, it is
recommended to thoroughly wash the straps with
soap & water and allow to dry before using the
sprayer.
Set
into
slot
WAND CLIP
The wand can be
attached to the pump
handle using the
wand clip.
4E
SPRAYER COMPONENTS & USE INFORMATION, Continued
3 STAGE FILTERING SYSTEM
This backpack sprayer is equipped with a 3 stage filtering system (see figure
1). Stage 1 is a filter basket incorporated into the tank opening where fluid is
added. Stage 2 filter is located at the inlet of the pressure cylinder. Stage 2
is a removable In-Tank filter. Stage 3 is a removable filter incorporated into
the shut-off assembly. Periodic cleaning of these filters is recommended to
insure consistent fluid flow through the sprayer. This will also reduce sprayer
component wear.
The stage 3 filter is a removable filter incorporated into the inlet side of the
shut-off valve (see section “disassembling and repairing the shut-off valve”) .
Make sure pressure is released before detaching the hose from the shut-off.
It is best to have no or minimal fluid in the pressure cylinder before removing
and reinstalling the stage 3 shut-off filter as fluid can leak from the hose.
Figure 2 Stage 2 (removable In-Tank filter)
Figure 1
Stage 2
(Removable
In-Tank Filter
Stage 3
(removable
Shut-off filter)
Stage 1
(Filter
basket)
Pressure
Cylinder
Guide edge facing away from
pressure cylinder
Guide edge on pressure
cylinder
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 4-gallon
(15.1L) 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.
5E
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. 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-ON POSITION NEUTRAL POSITIONLOCK-OFF POSITION
Locking Mechanism
Handle
Up
Handle
Down
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.
Note: If you experience a rapid drop in pressure, drain the sprayer completely and pump the handle
with an empty tank. The pressure chamber will fill with the required volume of air to repressurize.
Perform this procedure from time to time as routine maintenance.
POWDER-BASED CHEMICALS
Powder-based chemicals (powder mixed with liquids to 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.
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.
6E
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.
TROUBLE SHOOTING YOUR SPRAYER
Symptom Possible Reason Correction
Difficulty actuating the pump lever and/or Upper valve plate sticks Clean or replace valve plate
pump handle moves itself back up. Piston cylinder outlet passage clogged Clean piston cylinder outlet passage
Little or no resistance during Damaged/worn/dirty/upper and or lower valve plate Clean or Replace Valve Plate
repeated pumping – no pressure. Damaged /worn upper o-ring on piston Replace O-ring
Piston Collar or piston cylinder assembly is worn Replace Collar or Piston cylinder assembly
Too much resistance after just a few Not enough air cushion in the pressure Release pressure in pressure chamber
pumping strokes but pressure only lasts chamber Remove the hose & drain pressure
briefly. chamber. Reconnect the hose.
Upper valve plate damaged/worn/dirty Clean or replace upper valve plate
Upward pumping action is more difficult Vent hole is clogged Clear the vent hole in cap
and/or pump handle moves itself Lower valve plate sticks Clean or replace the valve plate
backdown. Clogged filter Clean in tank filter
Piston cylinder intake clogged Clean piston cylinder intake
When the handle is pulled up it moves Valve Plate sticking Clean or replace valve plate
itself back down
Leaks at Piston Cylinder Damaged/worn/Dirty Collar Clean or Replace Piston Collar
Damaged Piston Cylinder Replace Piston Cylinder
Damaged Piston Replace Piston
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
Leak between pump assembly Pump clamp loose Tighten clamp
and tank O-ring worn or damaged Replace pressure chamber o-ring
Hose leaking at tank outlet Hose clamp loose Tighten clamp
Hose leaking at shut-off Connection loose Tighten retaining nut
Damaged or worn o-ring/gasket Replace o-ring/gasket
7E
DISASSEMBLING AND REPAIRING THE PISTON PUMP
Collar
A
Figure 1
Figure 2
Figure 3
C
B
lay the unit on its back (Figure 1). Loosen the hose clamp and remove the
sprayer hose. Caution: There could be residual liquid in the hose and pressure
cylinder. Remove the nut and bolt from the protective cap and remove the cap
(ref: figure 9). Rotate the pump shaft in order to reach two lever bolts(A). Using
an allen wrench, remove the lever bolts. Pull the piston assembly (B) out of the
piston cylinder (C).
2) Remove the piston cylinder assembly by turning the piston cylinder
counter-clockwise when viewing the sprayer from the bottom. Caution: The
piston cylinder may have sharp edges.
3) Check for vertical scratches on the inside of the piston
cylinder and the piston. If one or both are scratched replace
them.
4) To replace the collar, push it off of the crown of the
piston with your thumb. You will see form fitted slots
to install the new collar on to the piston crown.
1) Remove the cotter pin and pump handle. With the pump facing towards you
Piston
Cylinder
Intake
Upper
Valve
Plate
Lower
Valve Plate
Piston cylinder tab
Figure 4
Figure 5
Pressure cylinder
base rib
Figure 6
Outlet
Passage
5) There are 2 valve plates on the piston cylinder, one on the inside of
the cylinder and one on the outside top. The valve plates are held in
place with a screw and washer and can be removed and replaced using a
Phillipshead screw driver. The 2 o-rings can be removed and replaced as
well. Insure that the o-rings are positioned in the o-ring grooves in the
piston cylinder.
6) Grease the 2 O-rings on the piston cylinder (do not get any grease on the
valve plate) and screw the piston assembly into the pressure cylinder base.
Screw the piston cylinder clockwise until tight and the bottom O-ring is no
longer visible. When properly placed, the tab on the piston cylinder will line up
with the rib on the pressure cylinder base.
8E
7) Apply Petroleum jelly to the inside of the piston cylinder wall
and on the collar, and reinstall the piston assembly into the piston
cylinder.
Figure 7
8) Insert the piston at an angle with the leading edge of the
collar placed over the slot in the piston cylinder. Bolt the piston
assembly to the pump shaft using the lever bolts.
Figure 8
Protective
Dust Cap
9) Replace the protective dust cap. Tighten the
nut and bolt. Reinstall the pump handle. Replace the hose
and firmly secure the hose clamp in place.
Figure 9
DISASSEMBLING AND REPAIRING THE PUMP ASSEMBLY
1. Release the pressure from the sprayer and remove all liquid from both the pressure chamber and tank.
2. Remove hose.
3. Remove the In-tank filter from the pressure chamber.
4. Remove 2 bolts attaching the pivot lever to the pump shaft and remove piston assembly (fig. 2a & 2b).
5. Remove the large clamp holding the pressure chamber and tank together (fig 1).
6. Rock the pressure chamber back and forth and push down to free it from the tank (fig 1).
7. Once freed the entire pump assembly can be removed by maneuvering it through the base frame
(fig 3a & 3b).
In-Tank
Filter
Figure 1
Clamp
Pressure
Chamber o-ring
Figure 2a
Pump
Assembly
Figure 2b Figure 3a Figure 3b
9E
Tank tab
Pump
Assembly
Notch
8. The pressure chamber o-ring can also be replaced. DO NOT stretch
the o-ring over the bottom flange. Assemble the o-ring over the top
of the chamber. Apply petroleum jelly to the o-ring before
reinstalling pump asembly into the tank (fig. 3b).
9. Reassemble backwards from step 6 thru 2, performing each step in
reverse. Note: there is a notch/tab combination in the pump
assembly/tank to be used for alignment (fig. 4).
Figure 4
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
C
Figure 3
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
B
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.
10E
REPLACEMENT PARTS ORDER INFORMATION
O-ring
99944100484
Flat Fan
Nozzle
Screw
Cap
Hose Washer
99944100485
Nozzle Kit
99944100482
Brass Adjustable
Nozzle
Wand
99944100483
Poly Adjustable
Nozzle
99944100481
Filter
Replacement
Kit
99944100480
Wand
Assembly
Retaining Nut
Hose
99944100477
Shut-off Valve
Repair Kit
11E
99944100479
Hose
Assembly
99944100478
Shut-off
Assembly
REPLACEMENT PARTS ORDER INFORMATION
99944100474
Piston
Cylinder
Assembly
99944100475
Pump Piston
Assembly
99944100486
O-ring Kit
Elbow O-ring
Nozzle Gasket Wand O-ring
Hose Gasket
Upper
Plate Valve
Upper O-ring
Lower O-ring
Piston
Collar
569035
Filter Basket
& Cap
Collar-
Pump Piston
Valve PlatePiston
Cylinder
99944100471
Piston Pump
Repair Kit
O-ring-
Pressure Cylinder
O-ringPiston Cylinder
569036
Pump Handle
99944100472
Straps
99944100488
Wand Clip
ECHO, INCORPORATED
400 Oakwood Road, Lake Zurich, IL 60047
www.echo-usa.com
MS-41BP MSP10000001 - MS-41BP MSP99999999
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