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62622
Quick-Connect
Compression Tester
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 Date 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. 25h
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-800-444-3353 as soon as possible.
Copyright
©
2025 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 may not be included.
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 1-800-444-3353. Item 62622
Specifications
Maximum
Working
Pressure
300 PSI
Pressure
Gauge Scale
0~300 PSI (In 10
PSI Increments)
0~2000 kPa (In 100
kPa Increments)
Page 3For technical questions, please call 1-800-444-3353.Item 62622
Important Safety Information
1. Do not exceed maximum 300 PSI
air pressure during use. Exceeding
maximum air pressure could
cause serious personal injury
and property damage.
2. Use extreme care when working
around hot or moving engine parts.
3. Verify vehicle’s transmission is
placed in Park (or Neutral for a
manual transmission) and the
emergency brake is applied.
4. Do not change fittings
with engine running.
5. Do not drive the vehicle
while under test.
6. Before testing, review and follow
instructions from the vehicle
manufacturer’s service manual.
7. After testing, turn engine off and
depressurize system before removing
test components. Place absorbing
cloths around fittings before
disconnecting. Wipe up any spilled fuel.
Place cloths in a fireproof container.
8. Clean all testing components of
residual fuel before storing.
9. Wear ANSI-approved safety
goggles and heavy-duty work
gloves during assembly.
10. This product is not a toy. Do not allow
children to play with or near this item.
11. Use as intended only.
12. Inspect before every use; do not
use if parts are loose or damaged.
13. The vehicle engine must never be
started in a closed garage, or any other
sealed structure. Carbon monoxide
is produced during operation and is
deadly in a closed environment. Early
signs of carbon monoxide poisoning
resemble the flu, with headaches,
dizziness, or nausea. If you have any
of these signs get fresh air immediately.
14. Maintain product labels and
nameplates. These carry
important safety information. If
unreadable or missing, contact
Harbor Freight Tools for a replacement.
SAVE THESE INSTRUCTIONS.
Page 4 For technical questions, please call 1-800-444-3353. Item 62622
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.
1. Attach proper size Adapter (2, 3, 4) to
Gauge (1) Hose.
Use Standard Reach Adapter (2) to
connect Gauge (1) to cylinder with
14mm standard length spark plug
threads.
Use Long Reach Adapter (3) to
connect Gauge to a cylinder with 12mm
standard length spark plug threads.
Use Standard Reach Adapter (4) to
connect Gauge to a cylinder with 10mm
standard length spark plug threads.
2. Remove spark plug from one cylinder
of the engine, and screw Adapter
into spark plug hole. Disable coil
to prevent engine from starting.
3. Turn on and Crank engine several
times until highest reading appears on
Compression Gauge (1). Make note
of reading, then press Air Release
Button on Compression Gauge to
release all compressed air in tool.
4. Turn off engine and remove Adapter
from spark plug hole and re-install
spark plug.
NOTE: When Gauge is not
pressurized, the Gauge needle may
be anywhere from in the zero box
without affecting accuracy of Gauge.
Maintenance and Servicing
1. BEFORE EACH USE, inspect the
general condition of the Tester. Check
for loose attachments, cracked or
broken parts, and any other condition
that may affect its safe operation. If
any abnormality is found, have the
problem corrected before further use.
2. AFTER EACH USE, wipe off
Tester with clean, moist cloth.
3. Lubricate attachments regularly to
ensure smooth operation.
Page 5For technical questions, please call 1-800-444-3353.Item 62622
Parts List and Diagram
Part Description Qty
1 Compression Gauge 1
2 Standard Reach Adapter
(M14 x 1.25)
1
Part Description Qty
3 Long Reach Adapter
(M12 x 1.25)
1
4 Standard Reach Adapter
(M10 x 1.00)
1
1
4
3
2
Record Date Code Here:
Note: If product has no Date Code, 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 193175585752 when ordering parts.
Page 6 For technical questions, please call 1-800-444-3353. Item 62622
PLEASE READ THE FOLLOWING CAREFULLY
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.
Page 7For technical questions, please call 1-800-444-3353.Item 62622
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.
Page 8 For technical questions, please call 1-800-444-3353. Item 62622
26677 Agoura Road • Calabasas, CA 91302 • 1-800-444-3353
