1. Handheld Sprayers
1.1. Operators Manuals
1.2. Service Bulletins
1.3. General Use Information

Getting started using your new Solo handheld sprayer is easy. Click to go to any section of instructions.

1.3.1. Using Nozzle
To change the spraying pattern, first make sure the retaining nut (2) is screwed tight to the elbow (5). If it is not tight, the nozzle cap
(1) and nozzle body (3) will rotate inside the retaining nut and the nozzle will not adjust.

For a straight stream pattern, rotate the nozzle cap outward. For a hollow cone pattern, rotate the nozzle cap inward towards the retaining nut.

If it becomes difficult to rotate the nozzle cap, remove the nozzle cap from the nozzle body and lubricate the O-ring on the nozzle body with a non-water soluble grease*.

1. Nozzle Cap
2. Retaining Nut
3. Nozzle Body
4. Filter
5. Elbow


1.3.2. Removing Nozzle

Unscrew the nozzle cap (1) from the nozzle body (3). This is best accomplished while the retaining nut (2) is securely fastened to the elbow (5). Next, unscrew the retaining nut (2). Push the nozzle body (3) out of the retaining nut (2). The filter (4) will come out with the body. To re-install the nozzle, reverse the above instructions.

1.3.3. Operation

• Before using sprayer with chemicals, fill sprayer with fresh water to
  assure that you have it properly assembled; pressurize and then
  practice spraying. When thoroughly familiar with sprayer operation,
  follow normal operating procedures.

• Turn pump handle counter clockwise to remove pump.

• Fill tank with premixed formula up to desired level. Do not exceed
  maximum fill mark. Observe recommendations of chemical     

• Tighten cap and pump assembly for a good seal.

• Pump to a maximum 45 psi or 3 bar pressure. The valve stem on the
  pressure relief valve will rise up to a red mark indicating 45 psi.

• Start or stop spraying by squeezing or releasing the lever on the shut-off
  valve (3). The spray pressure can be monitored with an optional pressure

• Prior to every removal of pump (1), release pressure first by pulling up
  on the pressure relief valve stem (2).

1.3.4. Cleaning

• Carefully clean sprayer after every use.

• Soap and water may be used to clean tank.

• Clean the hose and spray tube by flushing with water.

• Follow the recommendations of the chemical manufacturer for
  disposing of waste water and chemicals.

• Do not use aggressive or abrasive cleaning agents.

1.3.5. Maintenance
• Prior to storage, clean and empty sprayer.

• Always store the sprayer in a dry area, protected from freezing, heat and sunlight.

• Lubricate O-ring in pressure relief valve with non-water soluble grease* on a regular basis. Disassembly: Unscrew pressure relief valve from tank and pull the valve body out of the screw cap. Clean and lubricate.

• Should pumping action become difficult, remove the pump from tank, remove pump piston (4) from pump cylinder (3) and grease the O-ring (5) of the pump piston with non-water soluble grease*. NOTE: once tank cap is removed, the pump handle "piston" and "cylinder" (pump body) are disassembled simply by pulling apart. See Figure 6, page 5.

• Use Solo original parts and see your Solo dealer in case of any problems. In the interest of technical progress, we reserve the right to change technical specifications without prior notice.


Pump Maintenance - NOTE: pump pressure sealing is accomplished with an O-ring (5) on the pump piston (4) which moves within the
cylinder (3). Periodically this O-ring should be greased with a
non-water soluble grease*. If worn, it should be replaced. A small
umbrella valve (7) at the bottom of cylinder prevents the formula from entering the cylinder. Keep these parts clean and replace if worn.

Tank Cap - a small amount of non-water soluble grease* on tank
cap threads and both sides of the gasket eases tightening and
Regular Inspection - inspect and replace worn or damaged parts promptly. Pay particular attention to tank cap gasket, pressure
relief valve and seal, inflation valve (if fitted), umbrella valve O-rings and seals throughout sprayer. Regular lubrication of O-rings and seals is recommended.
1.3.6. Sprayer Uses
Plant Feeding and Protection - a variety of spray tips enables user to perform foliar feeding or to apply fungicides and pesticides effectively.

Herbicides - may be applied to reduce pesky weeds and plants;
however, avoid using same sprayer for plant feeding or protection.

Indoor Use - sprayers may be used to apply detergents, vinegar,
cleaning solutions, warm water (up to 120° F) and other non-toxic
household cleaners and maintenance liquids. Carpets, walls, glass, floors, ceilings and other surfaces can be treated. Do not use sprayer indoors which has previously been used with herbicides, pesticides or toxic chemicals.

Outdoor Use - window cleaner, detergent, general purpose cleaning solutions, certain wood preservatives, waxes, waterproofing and diluted household bleach (do not exceed 25% solution) are among the many things Solo sprayers can apply. Avoid using sprayer for cleaning and other applications once it has been used for plant protection or herbicide spraying.

*Solo Superior Grease or petroleum jelly work well.

1.3.7. Operating Features


Nozzles - Your Solo sprayer is standard with nozzle arrangements which provide a variety of spray patterns.


Item Pattern Application Part #
Flat spray nozzle Flat Row treatment 4074263
Jet stream nozzle Stream Spot & longer range 4074758
Jet stream nozzle and swirl plate Hollow Cone Shrubs & bushes 4074756 and   4074758
Plastic adjustable nozzle Variable Spot, shrubs
& bushes

1.3.8. Spray Tip Assembly
1. Flat spray nozzle
2. Filter
3. Jet cap
4. Swirl plate
5. Nozzle cap
6. Nozzle body
7. Brass adj. nozzle*
8. Nozzle retaining nut





adjustable nozzle

* Brass adjustable nozzle is not a standard item on all sprayers.
Spray tips should be assembled as above for desired spray pattern
1.3.9. Calibrating The Sprayer

The output of the sprayer should be checked by collecting and measuring the spray liquid emitted during one minute. Maintain steady pumping on the pump handle while measuring. Having determined the output from the nozzle in gallons/minute, the rate per unit area treated can be calculated knowing the swath width and walking speed.

Gal./acre = (Gal./min. of nozzle) x 43560 Sq. ft./acre
(Sq. ft./min.)

Note: Gal./min. for standard nozzles
Sq. ft./min.=Speed (ft./min.) x Swath Width (ft.)

1. Determine the nozzle's rated capacity. See page 6 of Solo parts list for nozzle ratings. Get the capacity in gallons/minute at the desired pressure. Test the delivery of the nozzle. Spray for one minute and collect the spray.

Gal./min. = oz. collected/minute
128 oz. = 1 gal.

2. Compute the area covered in square feet per minute. Select a comfortable walking speed and figure how many feet per minute you walk. A convenient fast walk for some is 2.5 mph, but this may vary. One mile per hour equals 88 feet per minute. An easy way to calculate is to simply measure the distance you walk in one minute.

3. Compute the gallons per acre. The above information is used to compute the gallons of spray that will be applied per acre.

1.4. Service and Repair
Note: Always wear rubber gloves, safety goggles and appropriate protective clothing when repairing a sprayer. Once a repair is completed, fill the unit with clean water, pressurize, and check for leaks. If the sprayer leaks, DO NOT USE. Repair leaks and re-check.
1.4.1. Service & Repair Video
Click Here to view a Service and Repair Video (Windows Media Player)
1.4.2. Troubleshooting Guide
Difficulty in moving
pump handle
• dirty cylinder wall • remove piston, clean and
• O-ring on piston swollen
  (not cleaned properly)
• replace O-ring
• no lube on piston/cylinder • lubricate with heavy

Low pressure & resistance during pumping • damaged O-ring in  
  pressure relief valve
• replace O-ring
• worn or damaged O-ring
  on piston
• replace O-ring
• tank cap not tight • tighten cap
• no lube on piston cylinder • lubricate piston, O-ring and

Leaks from end of spray wand • worn or damaged O-ring
   in shut-off valve
• rebuild shut-off valve
Leaks from inside cylinder • worn or damaged umbrella
   valve at bottom of cylinder
• replace umbrella valve
Leaks under cap • damaged or missing gasket • replace gasket
  • screw cap not tight • tighten tank cap
Leaks from shut-off valve • worn, damaged or loose
  fittings, lack of lubrication
• tighten fittings and replace
  worn parts, disassemble and
   lubricate O-rings
Leaks from hose • worn, damaged or loose
• tighten fittings and replace
  worn parts

Pressure relief valve sticks  • lack of lubrication or
   contaminated relief valve
• clean and lubricate pressure
   relief valve

Air leak - air coming out between the two halves of the pump support • tank cap not tight • tighten tank cap
• gasket twisted or lacking
• straighten gasket and lubricate
  with grease
• tank lip damaged • repair or replace tank
1.4.3. Sprayer Repair
Sprayer Disassembly & Repair
1. If the sprayer will not hold pressure, fill the sprayer 3" below the top with water. Replace the cap and pump 4 times. Filling the sprayer this full makes it very easy to pump up to the maximum pressure. CAUTION: The bottom of the pressure relief valve is submerged and will discharge water under pressure. Dry off any water on the outside of the sprayer. (See Figure 1) If you observe water leaking out of the sprayer, check for damage at the site of the leak.


 Figure 1
2. If the leak is at a connection, try to tighten the screw cap. If that fails, remove the screw cap and check the sealing surface to make sure that it is flat, smooth and the seal or O-ring is undamaged. Retighten. (See Figure 2)


Figure 2
3. When reassembling the connections, especially the hose, make sure the O-ring is seated before hand-tightening the screw cap. (See Figure 3)

Figure 3
4. The pressure relief valve is removed by unscrewing it from the tank. Once removed, the lower housing pulls off to access the O-ring on the stem (A). When replacing this O-ring, make sure it is seated in the recess on the stem. Lubricate O-ring on stem before reassembly. (See Figure 4)


Figure 4
5.If the pump fails to offer resistance when pumping, check the umbrella valve (B) on the bottom of the cylinder to make sure that it is in place and sealing. The umbrella valve is removed by pulling it out. Replace the umbrella valve by re-inserting into the hole on the bottom of the cylinder. (See Figure 5)


Figure 5 
6.The pump piston is removed from the cylinder by pulling the two apart forcefully. Occasionally the large gasket at the top of the cylinder will hold the cylinder in the tank cap. Turning the cylinder counter-clockwise while holding the tank cap and pulling the cylinder will help separate the two parts. (See Figure 6)


Figure 6
7.To replace the O-ring on the plug (C), remove the plug by prying it out with a screwdriver. Replace the O-ring and lubricate. Reassemble by pushing the plug in until it is flush with bottom of the pump piston. The pump piston O-ring must be replaced if damaged or worn. Lubricate before reassembly. (See Figures 7 and 8)
Figure 7

Figure 8


8.To replace the pump piston, remove the cylinder supports by pushing them out of the tank cap. Once the pump piston is replaced, the cylinder support is snapped back into place. (See Figure 9) Note: this is not necessary for most repairs.


Figure 9
 9.When reassembling the pump cylinder to the pump piston and cap, make sure that the gasket (D) does not get twisted. This will cause the sprayer to leak. It is important to keep this gasket lubricated with non-water soluble grease or Solo Superior Grease (part #9850). Note: the cylinder is shown removed from the tank cap for clarity. To ease in the assembly, insert the cylinder into the neck of the sprayer tank and then screw the cap assembly on. (See Figure 10)


Figure 10
10.   Remove the shut-off valve from the hose. Remove and replace the O-ring on the hose connection. Reinstall the shut-off valve. (See Figure 11)
Figure 11
1.4.4. Shut-Off Valve Repair
The Shut-Of Valve Disassembly & Repair
1.Complete shut-off valve. (See Figure 12)
Figure 12

2. To remove valve core, you must first disassemble the handle. Remove the retaining pin (A) by squeezing the notched end and pushing through the handle. Slide the handle off the valve core. (See Figure 13)


Figure 13
3. With the handle removed, unscrew cap which retains tension spring and push out valve core (B). Replace worn parts. Lubricate the O-rings and reassemble in reverse order. Note: the valve core in picture is painted white for clarity.
Figure 14
1.4.5. Wand Tip Assembly Video
Click Here to view the wand tip assembly video (Windows Media Player)
1.5. Spare Parts Lists
1.5.1. 430-1G,430-2G & 430-3G Illustrated Handheld Sprayer Parts List

 430-1G,430-2G & 430-3G 
Illustrated Handheld Sprayer Parts List

Model 430 SprayerParts List - Order
Part numbers correspond with image above.
Click on order number to order desired part.

Pos. No. PartNo. Description
1 4900162 Pressure relief valve
 4800250 Pressure relief valve (2013 & later)
2 4073852 Tank Cap
3/4/5 4400115 Pump Assembly
4 4073839 Pump Ring
6 4074655 Screw Cap
8 0064406 Tube
9 4400116 Hose Assembly
10 4800170 Shut-off Valve
11 4074329 Lock Clip
12 0610402-K Shut-off Valve Repair Kit
13 4900230 Wand
14 4074527 Elbow
15 4074756 Swirl Plate
16 4074758 Jet Cap Nozzle
17 4074263 Flat Spray Nozzle
18 4900527 Plastic Adjustable Nozzle
19 4074148 Screw Cap
20 4074283 Filter
21 4074405 Slide
22 0094174 Carrying Strap
* 0610403-K Sprayer Repair Kit
25 4900430 Drift Guard
26 0065210 Brass Flat Spray Nozzle
** 0610410-P Brass Adjustable Nozzle
** 4900477 Double Nozzle
** 0610456-P Nozzle Assortment
**Not shown in breakdown
1.5.2. 454, 456, 457 Illustrated Handheld Parts List

Handheld Sprayer Parts List -Order

Part numbers correspond with image above.
Click on order number to order desired part.

OrderNo. ForModel


1 4071262 456 Tank, 2gallon
- 4071267 454 Tank, 1gallon
4071263 457 Tank, 3gallon
2 4800185 Pressure relief valve assembly
3 0062166 * O-ring
4 0062258 * O-ring
5 4300245 Carrying Strap
6 4073835 Pump piston, solid
7 0062264 * O-ring
10 4073528 Tank cap, red
- 4073111 HD Tank cap, black
11 4074387 Cylinder support
- 4073834 Cylinder (use with0094308)
13 4061345 * Gasket
16 4900515 *** Pressure hose, assy.
17 4800170 Shut-off valve, assy.
18 4074295 Pin retaining
19 0062144 * O-ring
20 4900230 Wand Assy.(inc. 51& 52)
21 0062271 O-ring
21a  0062258 O-ring wand
22 4074527   Elbow
23 0094308 * Umbrella valve
24 4074283 Filter
25 0062106 O-ring
26 4074756 Swirl plate
27 4074758 Jet cap tip
28 4074148 Retaining nut
29 4074329 Lock clip
33 4074263 Flat spray nozzle
47 4074336 Retaining Nut
48 4074335 Lever
49 0610402-K Shut-off valve repair kit
52 4900527 Plastic adj.nozzle(inc. a & b)


Pos.No. OrderNo. ForModel Description
- 4900405-K Pump repair kit
32 4073410 ** Flange
34 2700316 HD No dripcheck valve
41 0062249 O-ring
42 4074338 Retainingnut
44 4900430 Drift guard
45 4900622 Pressure gauge assy.
50 0062115 HD O-ring
53 0065210 HD Brass flat spray nozzle

* Pump repair kit

** Organicliquidspray kit
***Cutpick-up tube to fit for models 454 & 456