Harbor Freight Tools 90153 User Manual
MINI-TRAILER
Model
90153
WARNING!
IMPORTANT INFORMATION
This trailer’s Hitch Coupler MUST be
properly secured to the hitch ball of the towing
vehicle. After assembly and attachment, pull
up and down on the Hitch Coupler to make
sure the hitch ball is fitting snugly in the Hitch
Coupler. There must be no play between the
hitch ball and Hitch Coupler. If there is play,
tighten the Adjustment Nut until no play is
present. If the Adjustment Nut is too tight, the
Handle will not lock. Carefully read and follow
the complete instructions in this manual
BEFORE setup or use.
If the Coupler is not secured
properly, the ball could come loose
while the trailer is in motion, possibly
causing property damage, SERIOUS
PERSONAL INJURY, or DEATH.
WITH 12” WHEELS
ASSEMBLY AND OPERATION INSTRUCTIONS
Due to continuing improvements, actual product may differ slightly from the product described herein.
For technical questions or replacement parts, please call 1-800-444-3353.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright© 2003 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.
Distributed exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our website at: http://www.harborfreight.com
Manual Revised 04j, 07f
CONTENTS
SPECIFICATIONS .................................................................................... 3
GENERAL SAFETY WARNINGS AND PRECAUTIONS ........................ 3
SPECIFIC PRODUCT WARNINGS AND PRECAUTIONS .....................4
UNPACKING ............................................................................................ 6
ASSEMBLY INSTRUCTIONS ..................................................................6
OPERATING INSTRUCTIONS ............................................................... 15
TIRE INFORMATION ..............................................................................16
Tire Terminology Glossary ..................................................................................16
Tire Markings ........................................................................................................17
Tire Ination and Load Limit ...............................................................................18
TIRE CARE ............................................................................................. 19
Checking Tire Pressure .......................................................................................19
Steps for Maintaining Proper Tire Pressure ......................................................19
Tire Size ................................................................................................................20
Tire Tread ..............................................................................................................20
Tire Rotation .........................................................................................................20
Tire Balance and Alignment ................................................................................20
Tire Repair ............................................................................................................20
VEHICLE LOAD LIMIT ........................................................................... 21
Steps for Determining Correct Load Limit .........................................................21
INSPECTION, MAINTENANCE, AND CLEANING ................................ 21
PARTS LIST AND DIAGRAMS ............................................................... 22
Parts List ...............................................................................................................22
Assembly Diagram ...............................................................................................23
Wiring Diagram .....................................................................................................24
SKU 90153 For technical questions, please call 1-800-444-3353. PAGE 2
SPECIFICATIONS
Payload (Maximum Capacity) 1,090 Lbs.
Weight (Ship/Net) 157 Lbs. / 151 Lbs.
Bed Dimensions 40-1/2” W x 48” L
Axle Clearance 7”
Class 1 Ball Hitch Size 1-7/8”
Tongue Height 12-1/2”
Safety Chain 1” Link (Welded)
7/32” Diameter x 42” L w/S Hooks
Tire Features 12” Wheel w/4 Lug Nut Pattern
Rim Size: 4.80/4.00 - 12”
Tire Size: 4.80 x 12, 4PR
Tire Pressure: 60 PSI
Lights & Wiring 12 VDC / DOT Approved
Save this Manual
You will need this manual for the safety warnings and precautions, assembly, operating, inspection, maintenance and cleaning procedures, parts list and assembly diagram.
Keep your invoice with this manual. Write the invoice number on the inside of the front
cover. Keep this manual and invoice in a safe and dry place for future reference.
GENERAL SAFETY WARNINGS AND PRECAUTIONS
KEEP WORK AREA CLEAN AND DRY. 1. Cluttered, damp, or wet work areas invite
injuries.
KEEP CHILDREN AWAY FROM WORK AREA. 2. Do not allow children to handle
this product.
STORE IDLE EQUIPMENT. 3. When not in use, tools and equipment should be stored
in a dry location to inhibit rust. Always lock up tools and equipment, and keep out
of reach of children.
DO NOT USE THIS PRODUCT IF UNDER THE INFLUENCE OF ALCOHOL OR 4.
DRUGS. Read warning labels on prescriptions to determine if your judgement or
reexes are impaired while taking drugs. If there is any doubt, do not attempt to
use this product.
USE EYE PROTECTION. 5. Wear ANSI approved safety impact eye goggles when
assembling this product. ANSI approved safety impact eye goggles are available
from Harbor Freight Tools.
DRESS SAFELY. 6. Do not wear loose clothing or jewelry, as they can become
caught in moving parts. Wear a protective hair covering to prevent long hair from
REV 09b
SKU 90153 For technical questions, please call 1-800-444-3353. PAGE 3
becoming caught in moving parts. If wearing a long-sleeve shirt, roll sleeves up
above elbows.
DO NOT OVERREACH.7. Keep proper footing and balance at all times to prevent
tripping, falling, back injury, etc.
INDUSTRIAL APPLICATIONS MUST FOLLOW OSHA REQUIREMENTS.8.
STAY ALERT.9. Watch what you are doing at all times. Use common sense. Do not
use this product when you are tired or distracted from the job at hand.
CHECK FOR DAMAGED PARTS.10. Before using this product, carefully check that
it will operate properly and perform its intended function. Check for damaged parts
and any other conditions that may affect the operation of this product. Replace or
repair damaged or worn parts immediately.
REPLACEMENT PARTS AND ACCESSORIES:11. When servicing, use only identi-
cal replacement parts. Only use accessories intended for use with this product.
Approved accessories are available from Harbor Freight Tools.
MAINTAIN THIS PRODUCT WITH CARE.12. Keep this product clean and dry for
better and safer performance.
MAINTENANCE:13. For your safety, service and maintenance should be performed
regularly by a qualied technician.
USE THE RIGHT TOOL FOR THE JOB.14. Do not attempt to force small equipment
to do the work of larger industrial equipment. There are certain applications for
which this equipment was designed. It will do the job better and more safely at the
capacity for which it was intended. Do not modify this equipment, and do not use
this equipment for a purpose for which it was not intended.
WARNING:15. The warnings, precautions, and instructions 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, which cannot be built
into this product, but must be supplied by the operator.
SPECIFIC PRODUCT WARNINGS AND PRECAUTIONS
TO AVOID PERSONAL INJURY AND/OR PROPERTY DAMAGE, DO NOT EX-1.
CEED THE TRAILER’S MAXIMUM CAPACITY PAYLOAD OF 1,090 LBS.
BEFORE EACH USE, ALWAYS EXAMINE THE TRAILER FOR PROPER TIRE (16) 2.
AIR PRESSURE, DAMAGED TAIL LIGHTS (parts #29, #29A), DAMAGED SIDE
RUNNING LIGHTS (30), LOOSE BOLTS AND NUTS, STRUCTURAL CRACKS,
BENDS, AND ANY OTHER CONDITION THAT MAY AFFECT ITS SAFE OPERA-
TION. Do not use the Trailer even if minor damage appears.
NEVER ALLOW ADULTS, CHILDREN, OR PETS TO RIDE IN THE TRAILER.3.
REV 09b
SKU 90153 For technical questions, please call 1-800-444-3353. PAGE 4
BEFORE EACH USE, ALWAYS ATTACH THE SAFETY CHAIN (25) OF THE 4.
TRAILER TO THE TOWING VEHICLE. Make sure the Safety Chain is attached
to the towing vehicle with the same length for each side. Do not allow the Safety
Chain to drag on the ground.
ALWAYS CHECK TO MAKE SURE THE PAYLOAD BEING TRANSPORTED IS 5.
PROPERLY AND SAFELY SECURED IN THE TRAILER. Load the Trailer evenly
from side to side with 60% of the load forward of the Axle (12).
MAKE SURE THE TOWING VEHICLE IS CAPABLE OF TOWING THE TRAILER 6.
AND ITS PAYLOAD. Make sure the hitch on the towing vehicle is capable of towing
the Trailer and its payload. The towing capacity of the hitch is typically stamped
on the hitch drawbar.
MAKE SURE THE COUPLER (23) AND THE VEHICLE’S BALL HITCH (not in-7.
cluded) ARE OF EQUAL MATING SIZE (1-7/8”) AND ARE RATED EQUAL TO
OR GREATER THAN THE WEIGHT OF THE TRAILER AND ITS PAYLOAD.
DO NOT EXCEED 45 MILES PER HOUR WHEN TOWING THE TRAILER.8. Excess
speed is a major cause of vehicle-trailer accidents.
THE TAIL LIGHT BULBS SUPPLIED WITH THIS TRAILER ARE FOR A 12 VOLT 9.
DC ELECTRICAL SYSTEM ONLY. Do not attempt to power the Light Bulbs with
any other type or voltage electrical current.
WHENEVER POSSIBLE, PARK THE TRAILER ON A FLAT, LEVEL, PAVED, 10.
SURFACE AND CHOCK BOTH TIRES TO KEEP THE TRAILER FROM ACCI-
DENTLY MOVING.
TRAILER LICENSING NOTICE:11. Some states may consider this Trailer a vehicle
requiring registration, licensing, and titling. Check with your State Department of
Motor Vehicles for information and guidance on registering, licensing, and titling
the Trailer.
MAINTAIN LABELS AND NAMEPLATES ON THE TRAILER.12. These carry im-
portant information. If unreadable or missing, contact Harbor Freight Tools for a
replacement.
REPORTING SAFETY DEFECTS:13. If you believe your vehicle has a defect which
could cause a crash or could cause injury or death, you should immediately inform
the National Highway Trafc Safety Administration (NHTSA) in addition to notifying
the manufacturer, Changzhou Nanxiashu Tool Company. If NHTSA receives similar
complaints, it may open an investigation, and if it nds that a safety defect exists in
a group of vehicles, it may order a recall and remedy campaign. However, NHTSA
cannot become involved in individual problems between you, Harbor Freight Tools,
or the manufacturer. To contact NHTSA, you may either call the Auto Safety Hotline
toll-free at 1-800-424-9393 or 202-366-0123 or write NHTSA, U.S. Department,
400 7th Street SW NSA-11, Washington, D.C. 20590. You may also obtain other
information about motor vehicle safety from the Hotline.
SKU 90153 For technical questions, please call 1-800-444-3353. PAGE 5
UNPACKING
When unpacking, check to make sure all the parts shown on the Parts List near
the end of this manual are included. If any parts are missing or broken, please call Harbor
Freight Tools at the number shown on the cover of this manual as soon as possible.
ASSEMBLY INSTRUCTIONS
Note: For additional references to the parts listed on the following pages, refer to the
Assembly Diagram near the end of this manual. Be sure to read the Bearing
Packing instructions on the last page of this manual.
HEX BOLT
(1)
FRONT
SIDE RAIL
CROSS
MEMBER
(4)
REAR
LEFT
(5)
CROSS
MEMBER
(4)
NYLON NUT (3)
(NOT SHOWN)
CROSS
MEMBER
(4)
RIGHT
SIDE RAIL
(5A)
FIGURE A
1. Lay out three Cross Members (4), the Right Side Rail (5A), and the Left Side Rail
(5). Then assemble the parts, using Hex Bolts (1) and Nylon Nuts (3).
(See Figure A.)
SKU 90153 For technical questions, please call 1-800-444-3353. PAGE 6
TOW BAR
(6)
FRONT
REAR
NYLON NUT (3)
(NOT SHOWN)
FIGURE B
HEX
BOLT
(1)
SPRING SIDE PLATE (8)
SPRING
HANGER
(7)
2. Turn the frame assembly upside down. Attach the Towbar (6) to the frame assembly,
using Hex Bolts (1) and Nylon Nuts (3). NOTE: Observe the direction in which the
Hex Bolts are inserted. (See Figure B.)
Attach 3. two of the Spring Hangers (7) to the front portions of the Right Side Rail
(5A) and the Left Side Rail (5), using Hex Bolts (1) and Nylon Nuts (3). Then attach
the remaining two Spring Hangers, each with a Spring Side Plate (8), to the rear
portions of the Right Side Rail (5A) and the Left Side Rail (5), using Hex Bolts (1)
and Nylon Nuts (3). (See Figure B.)
SKU 90153 For technical questions, please call 1-800-444-3353. PAGE 7
U-BOLT (13)
REAR
SLIPPER SPRING (9)
NUT (11)
SPRING HANGER (7)
AXLE (12)
NUT
(11)
SPRING
PLATE
(14)
COTTER PIN (33)
HEX BOLT (10)
LEFT SIDE RAIL (5)
COTTER PIN (33)
HEX BOLT (10)
FRONT
NYLON NUT (3)
FIGURE C
4. Place the Slipper Springs (9) in the Spring Hangers (7). Secure the Slipper Springs
to the Spring Hangers, using Bolts (10) and Nuts (11). Then, insert a Cotter Pin
(33) through the hole in the end of the Bolts and spread it. (See Figure C.)
Place the Axle (12) on top of the Slipper Springs (9). Position a Spring Plate (14) 5.
under the Slipper Springs. Place two U-Bolts (13) over each end of the Axle and
each Slipper Spring. Then insert the U-Bolts through the holes in the Spring Plates
and secure the Spring assembly, using Nylon Nuts (3). (See Figure C.)
Attach the Grease Fitting (35) to the Hub (15). 6. NOTE: Every 2,000 to 3,000 miles
of use, make sure to lubricate the Hub assembly with a heavy duty bearing grease.
(See Figure D, next page.)
Carefully slide the Hubs (15) over the Spindles at each end of the Axle (12). 7. Follow
the Bearing Packing Instructions as explained on the last page of this manual.
Insert the Outer Bearings (18) and a 3/4” Flat Washer (19) on the Spindles. Screw
a Castle Nut (20) tightly onto each Spindle. Then back the Castle Nuts off slightly
so that the Hubs (15) can just move freely. (See Figure D.)
SKU 90153 For technical questions, please call 1-800-444-3353. PAGE 8
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