Harbor Freight Tools Haulmaster 58203 Assembly instructions

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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 near the assembly diagram (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. 20l
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© 2020 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 an d se rv ic e may n ot b e in cl uded.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

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Table of Contents
Safety ................................................ 2
Specifications .................................... 4
Installation ......................................... 5
Operation .......................................... 6
Maintenance ..................................... 7
Parts List and Assembly Diagram ..... 8
Warranty ........................................... 7
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.
Save all warnings and instructions for future reference.
Basic Safety Information
Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
Personal Safety
1. Stay alert, watch what you are doing and use
common sense when operating a tool. Do
not use a tool while you are tired or under
the influence of drugs, alcohol or medication.
A moment of inattention while operating tools
may result in serious personal injury.
2. Use personal protective equipment. Always
wear eye protection. Safety equipment such
as non-skid safety shoes or a hard hat used for
appropriate conditions will reduce personal injuries.
Service
Have your tool serviced by a qualified repair person using only identical
replacement parts. This will ensure that the safety of the tool is maintained.
SAFETY OPERATION MAINTENANCEINSTALLATION

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Specific Safety Warnings
1. Do not exceed rated capacity.
2. Install on A-frame hitch before use.
3. Use on flat, level, hard surface
capable of supporting load.
4. Wear ANSI-approved safety goggles during use.
5. Prevent trailer wheels from moving using
wheel chocks while raising or lowering.
6. Before towing, fully raise Trailer Jack. Jack must
always be retracted when towing the trailer.
7. Keep out from under Jack and tongue when
applying and releasing load, when Jack is
supporting load, or when moving trailer.
8. Inspect before use. Do not use if
parts are loose or damaged.
9. Use in accord with DOT regulations.
10. Maintain labels and nameplates on
the tool. These carry important safety
information. If unreadable or missing, contact
Harbor Freight Tools for a replacement.
11. Apply force to Jack vertically only. Side
forces will compromise the Jack.
12. Do not use blocks for additional ground clearance.
13. Do not climb aboard any vehicle supported by Jack.
14. This product is not a toy. Keep it
out of reach of children.
15. Follow all state regulations for towing when
using Trailer Jack, including using safety
chains securely attached to the towing vehicle
when the trailer is hooked to the vehicle.
16. Check ground clearance carefully after
installing. If your trailer does not provide
enough ground clearance for the Jack, remove
the Jack entirely before towing trailer.
17. Do not use for aircraft purposes.
18. The warnings, precautions, and instructions
discussed in this instruction manual cannot
cover all possible conditions and situations
that may occur. It must be understood by the
operator that common sense and caution are
factors which cannot be built into this product,
but must be supplied by the operator.
SAVE THESE INSTRUCTIONS.
SAFETYOPERATIONMAINTENANCE INSTALLATION

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Functional Description
Specifications
Weight Capacity 3,500 lb.
Travel Length 
Lift Range 
Application For use with A-frame trailers
Hardware 
Components
Lock Pin
Footpad
Outer Tube
Mounting Plate
Light Switch
Directional
Switch
Wire
LED Light
SAFETY OPERATION MAINTENANCEINSTALLATION

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Installation Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this
manual including all text under subheadings therein before set up or use of this product.
Note: For additional information regarding the parts listed in the following pages, refer to
Parts List and Diagram on page 8.
Mounting
This Trailer Jack is designed specifically for use
with an A-frame hitch. Never attempt to mount this
Trailer Jack to a hitch or trailer not specifically designed
for it. An example of an A-frame hitch is shown in
Figure A. Check that the Outer Tube (16) of the Jack will
fit into the A-frame opening and that the Mounting Plate
holes align with the bolt locations on the trailer. Only a
qualified technician should modify the trailer if needed.
1. Block the wheels and support the trailer A-Frame
securely using jack stands (sold separately).
2. Disconnect the trailer battery
ground cable, if equipped.
3. If replacing a jack, remove existing jack.
4. Remove the Lock Pin (22) and slide out
the Footpad (23) from the Jack.
5. To ensure proper grounding, remove paint from
around one bolt hole on the Jack, and remove
paint from around the matching bolt hole on the
trailer tongue. If the paint layer is thick, add a flat
washer (sold separately) between the jack and the
trailer to provide good contact. Exposed metal can
be painted after assembly to inhibit corrosion.
6. Insert the bottom section of the Outer Tube (16) into
the A-Frame jack opening so that the Motor Housing
is toward the front of the trailer and the Mounting
Plate holes line up with the bolt holes in the trailer.
Rotate so
Motor faces
forward
Insert Jack into trailer opening
Rotate so
Motor faces
forward
Align bolt
holes
Lock Pin
Footpad
Trailer
Bolt
7. Secure the Mounting Plate to the A-Frame
using nuts, bolts and washers as listed under
Hardware in the Specifications chart on page 4.
Slide a star washer onto each bolt, then insert
them from the top side and attach a star washer
and lock nut from the underside of the frame.

Use a torque wrench to confirm tightness.
8. Replace the Footpad and insert the Lock Pin.
Wiring
The Jack needs to be properly wired for use.
Have a qualified technician perform the wiring if you
are not familiar with the following procedures.
1. Disconnect the trailer battery ground cable.
2. Connect the BLACK wire lead directly to
the positive (+) terminal of the battery.
Note: This Jack has a built-in circuit breaker that will
automatically trip and reset if amperage is too high.
3. Connect the WHITE ground wire to
the negative (-) battery terminal.
4. Reconnect the battery ground cable.
SAFETYOPERATIONMAINTENANCE INSTALLATION

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Operating Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this
manual including all text under subheadings therein before set up or use of this product.
Mounting the Trailer to the Towing Vehicle
1. Before mounting, chock the trailer wheels
to prevent the trailer from rolling.
2. If using the Jack with electric power:
a. Check that the Jack has been properly
wired by testing the Directional Switch.
b. If needed, turn on the LED lights
using the Light Switch.
Note: The LED lights will only work
when the Jack wiring is powered.
c. Check that the Switch Cover (27) is
secured over the Light Switch (3).
d. Push the Directional Switch (4) up to raise the
trailer to the level of the towing vehicle’s hitch.
Release Directional Switch to stop the Jack.
NOTICE: Release Directional Switch when the
motor slows, or switches off, to prevent damage
to the motor. Wait 15 seconds for the motor
to reset before operating the Jack again.
3. If using the Jack manually:
a. Disconnect power to the Jack.
b. Remove the Protective Cap (1) on the top of
the Jack to access the Drive Shaft (11).
c. Insert the Crank (17) onto the Drive Shaft.
d. Rotate the Crank counterclockwise to raise the
trailer to the level of the towing vehicle’s hitch.
Crank
Rubber
Access
Cover
4. With the assistance of a spotter,
back the vehicle to the trailer.
5. Mount the trailer onto the towing vehicle’s hitch.
6. Push the Directional Switch down toward the Jack
(electric) or turn the Crank clockwise (manual)
to retract the Jack slightly, lowering the trailer and
transferring its weight onto the towing vehicle.
7. Once trailer is fully engaged, continue to
retract Jack up to the “STOP” label on the
Inner Tube (20). Trailer Jack must always
be fully retracted when towing the trailer.
8. Attach the safety chain (sold separately).
Dismounting the Trailer from the Towing Vehicle
1. Before dismounting, chock the trailer wheels
to prevent the trailer from rolling.
2. If using the Jack with electric power:
a. If needed, turn on the LED lights
using the Light Switch.
Note: The LED lights will only work
when the Jack wiring is powered.
b. Check that the Switch Cover is
secured over the Light Switch.
c. Push the Directional Switch (4) up to raise the
trailer to the level of the towing vehicle’s hitch.
Release Directional Switch to stop the Jack.
3. If using the Jack manually:
a. Disconnect power to the Jack.
b. Remove the Protective Cap (1) on the top of
the Jack to access the Drive Shaft (11).
c. Insert the Crank (17) onto the Drive Shaft.
d. Rotate the Crank counterclockwise to
extend the Jack and raise the trailer.
4. Continue to extend just enough for the Trailer
Jack to take the weight of the trailer. This will
make it easier to disengage the trailer hitch.
5. Disengage the electrical connections, the trailer
hitch, any safety chains or other connections,
between the vehicle and the trailer.
6. You may need to extend the Jack further
to clear the trailer hitch. When the vehicle
is completely clear, and it is safe to do so,
drive the vehicle away from the trailer.
CAUTION: Have a spotter watch this operation
to be sure the trailer is clear of the vehicle.
7. When finished raising or lowering the trailer:
a. If using with electric power,
disconnect power to the Jack.
8. If using the Jack manually, remove the
Crank and replace the Protective Cap.
Store the Crank in a safe place for future use.
SAFETY OPERATION MAINTENANCEINSTALLATION

Page 7For technical questions, please call 1-888-866-5797.Item 58203
ttt
User-Maintenance Instructions
Procedures not specifically explained in this manual must
be performed only by a qualified technician.
TO PREVENT SERIOUS INJURY:
Remove Jack from trailer before performing any inspection, maintenance, or cleaning procedures.
TO PREVENT SERIOUS INJURY FROM TOOL FAILURE:
Do not use damaged equipment. If abnormal noise or vibration occurs,
have the problem corrected before further use.
Cleaning, Maintenance, and Lubrication
1. BEFORE EACH USE, inspect the general
condition of the tool. Check for:
• loose hardware
• misalignment or binding of moving parts
• cracked or broken parts
• any other condition that may
affect its safe operation
2. If welded, check welds for cracks.
3. If the Trailer Jack has been exposed to salt water,
immediately wash off with fresh water. Then
use a light oil to lubricate all moving parts.
4. AFTER USE, wipe external surfaces
of the tool with clean cloth.
PLEASE READ THE FOLLOWING CAREFULLY

IN THIS MANUAL 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


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

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.
SAFETYOPERATIONMAINTENANCE INSTALLATION

Parts List and Diagram
Part Description Qty
1 Protective Cap 1
2 Cover 1
3 Light Switch 1
4 Directional Switch 1
5 Motor 1
6-10  1
11 Drive Shaft 1
12 Short Positive/Negative Wire 1
13 LED Light 1
14 Wiring Board 1
15 ACME Screw 1
16 Outer Tube 1
17 Crank 1
18 Mounting Plate 1
19 Black Wire 1
20 Inner Tube 1
21 White Wire 1
22 Lock Pin 1
23 Foot Pad 1
24 Up/Down Switch Cover 1
25 LED Wire 1
26 Hardware Kit 3
27 Light Switch Cover 1
Record Product’s 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 193175434166 when ordering parts.
26541 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797