Niagara 56645 Assembly instructions

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Email our technical support at: [email protected]
Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the
back of the manual (or month and year of purchase if product has no number). Keep this manual and the
receipt in a safe and dry place for future reference. 22b
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright©2021 by Harbor Freight Tools®. All rights reserved.
No portion of this manual or any artwork contained herein may be reproduced in
any shape or form without the express written consent of Harbor Freight Tools.
Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
Tools required for assembly and service ma y n o t b e i n c l u d e d .
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

Page 2 For technical questions, please call 1-888-866-5797. Item 56645
WARNING SYMBOLS AND DEFINITIONS
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that
follow this symbol to avoid possible injury or death.
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Addresses practices not related to personal injury.
IMPORTANT SAFETY INFORMATION
Read all safety warnings and instructions.
Failure to follow the warnings and instructions may result in serious injury.
Work Area
1. Keep your work area clean and well lit.
Cluttered dark areas invite accidents.
2. The work area should have adequate
drainage to reduce the possibility of
a fall due to slippery surfaces.
3. Keep bystanders, children, and visitors
away while operating the Sprayer.
Distractions can cause you to lose control.
Personal Safety
1. Follow all guidelines regarding
chemicals sprayed, including MSDS
instructions and EPA regulations.
2. If the amount of weight you can lift safely
is limited, do not fill the Tank completely
to prevent strain and injury.
3. Stay alert. Watch what you are doing and use
common sense when operating the Sprayer.
Do not use the Sprayer while tired or under
the influence of drugs, alcohol, or medication.
A moment of inattention while operating the
Sprayer may result in serious personal injury.
4. Dress properly. Do not wear loose
clothing or jewelry. Contain long hair.
5. Do not overreach. Keep proper
footing and balance at all times.
Proper footing and balance enable better
control of the tool in unexpected situations.
6. Always wear eye protection.
Wear ANSI-approved safety goggles.

Page 3For technical questions, please call 1-888-866-5797.Item 56645
Use
1. Use only for water or water-based fertilizers,
herbicides, pesticides and sealers. Do not use
to spray combustible or corrosive chemicals.
2. Do not point the Sprayer at yourself,
other people or animals.
3. Industrial applications must follow
OSHA requirements.
4. Make sure the liquid used in the
Sprayer is not dirty or sandy.
5. This product is not a toy. Do not allow
children to play with or near this item.
6. Use as intended only.
7. Inspect before every use; do not use
if parts are loose or damaged.
8. Maintain product labels and nameplates.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
9. The warnings and cautions discussed in this
manual cannot cover all possible conditions
and situations that may occur. The operator
must understand that common sense and
caution are factors that cannot be built into this
product, but must be supplied by the operator.
Service
1. Have your Sprayer serviced by a qualified repair
person using only identical replacement parts.
This will ensure that the safety of
the tool is maintained.
2. Store idle tools and equipment out of
reach of children and other untrained
people. Tools and equipment are dangerous
in the hands of untrained users.
3. Maintain the Sprayer with care. Keep
this product clean. A properly maintained
Sprayer is easier to control.
SAVE THESE INSTRUCTIONS.

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Specifications
Tank Capacity 4 Gallons
Empty Weight 9 lb
Max PSI 90 PSI
Components and Controls
Note: For additional information regarding the parts listed in the following
pages, refer to the Parts List and Diagram on page 10.
Stand
Nozzle
Tank
Hose
Pump
Handle
Tank
Lid
Wand
Trigger
Shoulder Strap
Wand Holder

Page 5For technical questions, please call 1-888-866-5797.Item 56645
Assembly Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this document
including all text under subheadings therein before set up or use of this product.
Attaching the Wand
1. Insert end of Wand into the end
of the Trigger Assembly.
2. Slide Nut over threaded end of Trigger Assembly,
then turn clockwise and tighten Nut securely.
Trigger Assembly
Nut
Wand
Changing the Nozzle
WARNING! TO PREVENT SERIOUS INJURY: Relieve
pressure and empty tank before changing Nozzles.
1. Loosen Nut by turning counterclockwise.
Remove Nozzle.
2. Replace Nozzle. Tighten Nut securely.
3. When using the Adjustable Nozzle, adjust the
output flow by turning the nozzle’s Cap.
Wand
Cone
Nozzle
Nut
Double
Cone Nozzle
Fan Nozzle Sprinkler
Nozzle
Adjustable Nozzle
Cap
Pump Handle Orientation
The Pump Handle can be installed on either side of
the Tank. To change the side that the Handle is on:
1. Remove the Butterfly Nut and M5 Screw. Save
these parts and remove the Pump Handle.
2. Move the Pump Handle to the other side
of the Tank and attach it to the other end of
the Turning Rod using the saved parts.
Pump
Handle
Turning
Rod
Butterfly
Nut
M5 Screw
Tank
Attaching the Shoulder Straps
Attach each Shoulder Strap to bottom
of Tank, one on each side.
Shoulder Strap Hook

Page 6 For technical questions, please call 1-888-866-5797. Item 56645
Operating Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this document
including all text under subheadings therein before set up or use of this product.
WARNING! TO PREVENT SERIOUS INJURY:
Follow all guidelines regarding chemicals sprayed,
including MSDS instructions and EPA regulations.
CAUTION! If the amount of weight you can lift
safely is limited, do not fill the Tank completely
to prevent strain and serious injury.
1. Remove Tank Lid and fill Tank, through the Tank
Filter, no higher than top fill line. Replace Tank Lid.
2. Strap the Sprayer to your back.
a. Put your arms though the Shoulder Straps
so the pads rest on your shoulders
with the Tank behind your back.
b. Wrap the waist strap around your waist
and connect the buckle to secure.
c. Adjust shoulder and waist straps as needed.
Waist Strap Buckle
Shoulder
Straps
3. Pump the Handle to build up sufficient pressure.
4. Remove the Wand from its holder
on the lid of the Tank.
5. Point the Nozzle toward the area to be sprayed,
then depress the Trigger to begin spraying.

Page 7For technical questions, please call 1-888-866-5797.Item 56645
6. For continuous spray, press the Trigger down and
pull the Trigger Lock back, then release the Trigger.
Trigger
Lock Trigger
Trigger Lock On
To stop continuous spray, press the
Trigger down and push the Trigger Lock
forward, then release the Trigger.
Trigger Lock Off
7. As you spray, the Sprayer will depressurize.
When decreased pressure is affecting spray
pattern, pump the Pump Handle until proper
pressure is achieved, then resume spraying.
8. When finished spraying:
a. Point Wand in safe direction and depressurize
the Tank by pressing down on the Trigger.
b. Dispose of liquid according to
manufacturer guidelines.
c. Clean the Sprayer according to
Maintenance Instructions.
d. Store Sprayer in a safe, dry, clean location
out of reach of children and out of sunlight.

Page 8 For technical questions, please call 1-888-866-5797. Item 56645
Inspection, Maintenance, and Cleaning
Procedures not specifically explained in this manual must
be performed only by a qualified technician.
TO PREVENT SERIOUS INJURY FROM PRODUCT FAILURE:
Do not use damaged equipment. If abnormal noise, vibration, or
leaking air occurs, have the problem corrected before further use.
Follow all guidelines regarding chemicals sprayed, including MSDS instructions and EPA regulations.
1. BEFORE EACH USE, inspect the general
condition of the Sprayer. Check for:
• loose hardware,
• misalignment or binding of moving parts,
• cracked or broken parts, and
• any other condition that may
affect its safe operation.
2. AFTER EVERY USE, clean the Sprayer:
a. Flush with water.
b. Clean Nozzle, Handle Filter, and Tank Filter.
c. Rinse with water and allow to air-dry
with the Tank open.
3. PERIODICALLY, lubricate all moving parts of
the pump assembly with petroleum jelly.
4. STORAGE
Store Sprayer in a safe, dry, clean location out
of reach of children and out of sunlight.
Cleaning the Handle Filter
1. Remove Trigger Assembly from the Wand
by turning it counter clockwise.
2. Remove the Wand Handle from the
Trigger Body by turning it counter clockwise.
3. Carefully remove the Handle Filter,
saving all pieces.
4. Flush Filter with clean water.
5. Reassemble Trigger Assembly.
Wand Handle
Handle Filter
Trigger Body
Trigger Sealing
Ring
Trigger Assembly

Page 9For technical questions, please call 1-888-866-5797.Item 56645
Troubleshooting
Problem Possible Causes Likely Solutions
Unit does not spray.
1. Not enough liquid in tank.
2. Sprayer not pressurized.
3. Nuts loose.
4. Spray fluid contains particles or
sand.
5. Nozzle and/or Filter clogged
with mineral buildup.
1. Add liquid to tank.
2. Pump Handle to pressurize Sprayer.
3. Tighten Nuts.
4. Disassemble, clean, then reassemble Nozzle
and/or Handle and Tank Filters. Empty, clean,
then refill Tank with properly strained fluid.
5. Disassemble, clean, then reassemble
Nozzle and/or Handle and Tank Filters.
Spray pattern is
undesirable.
1. Spray fluid contains particles or
sand.
2. Nozzle and/or Filter clogged
with mineral buildup.
1. Disassemble, clean, then reassemble Nozzle
and/or Handle and Tank Filters. Empty, clean,
then refill Tank with properly strained fluid.
2. Disassemble, clean, then reassemble
Nozzle and/or Handle and Tank Filters.
Follow all safety precautions whenever diagnosing or servicing the Sprayer.
Record Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not available
individually as replacement parts. Specify UPC 792363566452 when ordering parts.

Page 10 For technical questions, please call 1-888-866-5797. Item 56645
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM
IN THIS DOCUMENT AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR
MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS
QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE
ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY
STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND
LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY
ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS
THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
Parts List and Diagram
Parts List
Part Description Qty
1 Nozzle Cap 1
2 Nozzle O-Ring 1
3 Joint 1
4 Wand O-Ring 2
5 Split Sleeve 2
6 Wand Nut 2
7 Wand 1
8 Trigger 1
8-1 Trigger Lock 1
8-2 Trigger Lever 1
8-3 Trigger Nut 1
8-4 Trigger Spring 1
8-5 Valve Core 1
8-6 Valve Core O-Ring 1
8-7 Trigger Sealing Pad 1
8-8 Trigger Pin 1
8-9 Trigger Body 1
8-10 Trigger Sealing Ring 1
8-11 Wand Handle Filter 1
8-12 Wand Handle 1
9 Hose Nut 1
10 Hose 1
11 Hose Locking Ring 1
12 Tank Lid 1
13 Air Intake Plug 1
14 Tank Gasket 1
15 Tank Filter 1
16 Tank 1
17 Back Pad 1
19 Screw, M6 x 12 2
20 Screw, M6 x 18 2
21 Nut, M6 2
22 Air Chamber O-Ring 1
Part Description Qty
23 Air Chamber 1
24 Pump O-Ring Ø29 1
25 Pump O-Ring Ø49 1
26 Screw ST4×8 2
27 Flat Gasket 2
28 Pump Valve Gasket 2
29 Pump Cylinder 1
30 Piston Spring 1
31 Piston Bowl 1
32 Piston 1
33 Connecting Rod Clamp 1
34 Connecting Rod Calibre 1
35 Operation Arm 1
36 Inner hex Screw, M8 x 25 2
37 Nut, M5 2
38 Pump Locking Ring 1
39 Screw, M5 1
40 Piston Cover 1
41 Screw, M5 x 25 1
42 Screw, ST3 x 10 2
43 Pump Handle Cover 1
44 Pump Handle 1
45 Nut, M5 1
46 Turning Rod 1
47 Flat Gasket 2
48 Turning Rod Sleeve 2
49 Split Pin 1
50 Screw, M5 x 25 1
51 Shoulder Strap 1
52 Cone Nozzle 1
53 Fan Nozzle 1
54 Double Cone Nozzle 1
55 Adjustable Jet Nozzle 1

Page 11For technical questions, please call 1-888-866-5797.Item 56645
Assembly Diagram

26677 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797
Limited 90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards,
and warrants to the original purchaser that this product is free from defects in materials and workmanship for the
period of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly,
to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper
installation, normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, injuries
to persons or property, or for incidental, contingent, special or consequential damages arising from the use of
our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation charges
prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise.
If our inspection verifies the defect, we will either repair or replace the product at our election or we may
elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will
return repaired products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.