Read Carefully Before Use
Keep for Future Reference
UM-VPH-0041-V3
A/C Vacuum Pump
& Gauge Set
User Manual
How did we get our start?
Orion Motor Tech began with a passion for cars. We started out by maintaining family cars in
our home garage but quickly found that affordable quality tools are hard to come by. That’s why
we made it our mission to put durable tools in the hands of do-it-yourself repairmen—so you
can get the job done right.
What makes our products unique?
We have a wide inventory of quality automotive tools and parts, covering almost all makes and
models. As a professional manufacturer, we are driven to make top-quality products affordable
for both professional and amateur mechanics.
Why do we love what we do?
We’re still in love with cars—just like we were back in that old family garage. We hope to pass
that passion on to all our customers, and we still believe in our old motto: You don’t need more
cars in your life. You need more life in your car.
Contact Us
Thank you for choosing our products! If you have any questions or comments,
contact us and we'll address your issues ASAP!
support@orionmotortech.com
https://orionmotortech.com/
@OrionMotorTech
More Life in Every Mile
Contents
1 Safety Information ........................................................................................................... 1
1.1 Disclaimer ................................................................................................................................................ 1
1.2 Symbol Guide ......................................................................................................................................... 1
1.3 General Safety Instructions ................................................................................................................. 2
1.4 PPE Safety Instructions ........................................................................................................................ 2
1.5 Work Area Safety Instructions ............................................................................................................ 2
1.6 Operational Safety Instructions ......................................................................................................... 3
1.7 Disposal Instructions ............................................................................................................................. 4
2 Introduction ...................................................................................................................... 5
2.1 Designated Use ...................................................................................................................................... 5
2.2 Specifications ......................................................................................................................................... 5
2.3 Package List ............................................................................................................................................ 6
2.4 Product Diagram .................................................................................................................................... 7
3 Installation ......................................................................................................................... 8
3.1 Preparing the Pump .............................................................................................................................. 8
3.2 Preparing the Gauge Set ..................................................................................................................... 10
4 Operation .......................................................................................................................... 12
4.1 Connecting the Gauge Set ................................................................................................................. 12
4.2 Evacuating ............................................................................................................................................... 14
4.3 Charging .................................................................................................................................................. 16
4.4 Cleaning ................................................................................................................................................... 20
5 Maintenance ...................................................................................................................... 21
5.1 General Maintenance ............................................................................................................................ 21
5.2 Replacing Vacuum Pump Oil .............................................................................................................. 22
6 Troubleshooting ................................................................................................................ 23
1
1 Safety Information
1.1 Disclaimer
1.2 Symbol Guide
The following symbols appear on this machine’s labels or in this manual:
These items indicate an imminent hazard that WILL
result in death or severe injury if not avoided.
Always wear protective eyewear around this product
during operation.
These items indicate a potential risk that COULD
result in death or serious injury, as well as
significant equipment damage.
Always wear protective gloves around this product
during operation.
These items address similarly serious concerns
about electrical components.
Always wear a hearing protector around this product
during operation.
These items address similarly serious concerns
about fire hazards.
This product is sold in conformity with applicable EU
regulations.
Note These items address tips that help.
This product contains electrical components that
should not be disposed of with regular garbage.
Always wear a respirator around this product during
operation.
Read this disclaimer completely and carefully before
proceeding with the rest of the manual content.
1. Product Modifications
Any modifications or alterations to OrionMotorTech (OMT)
products void any warranties and may result in damage or
injury. OMT shall not be liable for any damages resulting
from such modifications or alterations.
2. Compliance with Laws
Customers shall be liable for ensuring that the use of
OMT products complies with all applicable laws and
regulations in their respective jurisdictions. OMT assumes
no responsibility for any violations of laws or regulations
resulting from the use of OMT products.
3. Correct Use
Always use OMT products only as directed in the
accompanying manuals. Failure to follow instructions may
result in injury or damage.
Always ensure the assembly, installation, operation,
maintenance, or repair of OMT products is carried out by
a competent person.
Always make maintenance regularly throughout OMT
products’ lifecycles; you have the liability to keep the
products operating as intended.
Always wear appropriate protective gear.
4. Third-Party Products
OMT shall not be liable for any damages or losses
resulting from the use of third-party products in
conjunction with OMT products. Customers shall refer to
the third-party’s guidelines or/and warranties (if any) for
any third-party products used.
5. Limitation of Liability
OMT shall not be liable for any direct, indirect, punitive,
incidental, special, or consequential damages to property
or life, whatsoever arising out of or connected with the
use or misuse of OMT products. In no event shall OMT’s
liability exceed the value of the products sold.
6. Warranty
Refer to the sales page for the warranty information.
This disclaimer states the entire obligation of OMT with
respect to OMT products. If any part of this disclaimer is
determined to be void, invalid, unenforceable, or illegal,
including but not limited to the warranty disclaimers, liability
disclaimers, and liability limitations set forth above, the invalid
or unenforceable provision will be deemed superseded by
a valid and enforceable provision that most closely matches
the intent of the original provision and the remainder of the
agreement shall remain in full force and effect.
2
1.3 General Safety Instructions
• Read this manual carefully BEFORE installation, use, and maintenance, and store it for future reference.
• Follow ALL these instructions strictly DURING installation, use, and maintenance. Failure to do so can result in
severe property damage and personal injury.
Provide this manual to anyone who will use this product. Include this manual alongside this product if it is ever
given or sold to a third party. Failure to do so may lead to property damage and personal injury.
• ONLY use this product for its intended purpose, removing gas molecules from a sealed volume to create a partial or
complete vacuum.
It is NOT a toy and should NOT be used playfully or carelessly.
Any other use NOT specified in this manual could pose risks and void ALL warranties stated or implied.
• DO NOT use this product while you are tired or under the influence of drugs, alcohol, or strong medication.
• DO NOT allow children under the age of 18, anyone WITHOUT specialized training, persons unfamiliar with this
product, or people whose physical or mental impairment precludes safe use to use this product.
• ALWAYS keep children, bystanders, and pets away during use. Restrict access to your work area as needed.
• This manual ONLY provides instructions about THIS product. For instructions on specific tasks, refer to the
service manual by your A/C system’s manufacturer.
1.4 PPE Safety Instructions
• Wear appropriate personal protective equipment (PPE) as needed:
Breathing, eye, and hand protection for systems that contain refrigerants or other substances capable of
generating harmful gases or causing burns, scalds, frostbite, etc. Protective equipment must meet ANSI (American
National Standards Institute) or OSHA (Occupational Safety and Health Administration) standards.
Hearing protection for noise generated by this product during operation.
• ALWAYS avoid ALL direct contact with the vacuum pump oil.
If contact accidentally occurs with the skin, remove contaminated clothing and rinse the skin with plenty of water.
If contact accidentally occurs with the eyes, IMMEDIATELY flush them with plenty of water for at least 15
minutes while seeking medical attention.
• NEVER swallow the oil, which may cause FATAL problems.
1.5 Work Area Safety Instructions
Make sure your work area meets the following requirements:
• No bystanders, children, or pets
• Helpers wearing necessary PPE
• Well-lit and ventilated but adequately protected from the elements
• Clean and clear of clutter
• Free from flammables, explosives, and heat sources such as firecrackers and open flames. This is especially
important when working with systems that contain refrigerants or other substances that pose the risks of fire,
explosion, carbon monoxide poisoning, etc.
3
1.6 Operational Safety Instructions
• DO NOT operate this product if any component is damaged or shows any sign of malfunction. Repair or replace
affected components before further use.
• NEVER replace any components with nonidentical or unauthorized parts.
• For HVAC systems, ALWAYS turn it off BEFORE performing evacuation with this product.
• ALWAYS check that this product’s power cord is undamaged BEFORE use. NEVER attempt to remove ANY
permanently preconnected power cords.
• ONLY use this product with stable, compatible, and well-grounded power sources.
• DO NOT use 3-to-2 prong adapters, ungrounded extension cords, or extension cords of insufficient gauge for
this product’s expected electrical load.
• Stay alert, watch what you are doing, and use common sense when using this product.
• Refrigerant can irritate your eyes, nose, throat, and skin or cause frostbite, heart arrhythmia, unconsciousness,
and EVEN death. Insufficient preparations may cause accidents, leading to serious consequences.
• DO NOT move this product by pulling on its power cord or modifying its power plug.
• In case of power loss during operation, IMMEDIATELY unplug this product until power is restored.
• DO NOT wet or operate this product with wet hands or in highly humid environments.
• If ANY electrical component accidentally becomes wet, IMMEDIATELY disconnect this product from power and
wait for it to completely dry BEFORE resuming use.
• DO NOT run this product WITHOUT the vacuum pump oil or with its oil inlet left open.
• ALWAYS maintain the oil level between the MIN and MAX height marks on the reservoir window during use.
• DO NOT leave this product unattended during use.
• Use EXTREME caution when disconnecting hoses from A/C systems after use. They may still contain some
pressurized refrigerant.
• DO NOT rinse the entire product with tap water, immerse it in water, or expose it to rain.
• If you begin to develop symptoms such as headaches, dizziness, or nausea during use, IMMEDIATELY stop work
and get fresh air.
DO NOT continue work until better ventilation is provided for your work area. This is especially important when
you work on HVAC systems.
• DO NOT maintain this product with harsh abrasives or caustic chemicals.
• NEVER disassemble this product.
• NEVER modify its internal components WITHOUT professional guidance.
4
1.7 Disposal Instructions
Electrical products should not be disposed of with household products. In the EU and UK, according to the European
Directive 2012/19/EU for the disposal of electrical and electronic equipment and its implementation in national laws,
used electrical products must be collected separately and disposed of at the collection points provided for this purpose.
Locations in Australia, Canada, and the United States may have similar regulations.
5
2 Introduction
2.1 Designated Use
This product set is used to remove air and any residual gases from the A/C system and recharge
the A/C system with refrigerant.
2.2 Specifications
Vacuum Pump
Product Model VB240
Power Supply AC 110–120 (V), 60 Hz
Rated Power 375 W ±15%
Evacuation Speed 5 cfm 0.14 m³/min
Working Oil Volume Range 10.8–14.9 (fl oz) 320–440 (mL)
Compatible Refrigerants A1 and A2L, for example, R32, R1234yf, R134a, R22, and R410a
Air Inlet Size 1/4” SAE Male; 1/2”ACME Male
Power Cable Length 55.1 in. 1.4 m
Noise Level ≤ 70 dBA
Dimensions (W×D×H) 12.6 × 5.3 × 9.1 (in.) 320 × 135 × 232 (mm)
Net Weight 18.7 lb. 8.5 kg
Gauge Set
Low Pressure
Gauge
Pressure Range − 30 to 350 (psi) − 1 to 25 (bar)
Temp. Range -40 to 180 (° F) -40 to 82.2 (° C)
High Pressure
Gauge
Pressure Range -30 to 800 (psi) -1 to 55 (bar)
Temp. Range -20 to 100 (° F) − 28.89 to 37.78 (° C)
Hoses
Length 59 in. 1.5 m
Max. Pressure 4000 psi 275.8 bar
Net Weight 7.28 lb. 3.3 kg
6
No. Item Qty.
A Vacuum Pump 1
B Vacuum Pump Oil 46 230 ml & 330 ml 2
C High-Pressure Hose (Red) 1
D Low-Pressure Hose (Blue) 1
E Charging Hose (Yellow) 1
F Evacuation Hose (Black) 1
G Work Gloves 1 Pair
H Self-Sealing Cap Lifter for R134a refrigerant 1
I
Self-Sealing Cap Lifter for R1234yf refrigerant
(with an indented ring at the bottom)
1
J Thermometer 1
K
High-Pressure Quick Coupler (Red, for R134a
refrigerant)
1
L
Low-Pressure Quick Coupler (Blue, for R134a
refrigerant)
1
No. Item Qty.
M Pressure Gauge Set 1
N Dual-Purpose Screwdriver 1
O Valve Core Wrench 1
P
1/4 SAE to 5/16 SAE Adapters for Cap Lifters, ×2
1/4 SAE to 1/2 ACME Thread Adapter for Cap
Lifters, ×1
1/4 SAE to 1/2 ACME Reverse Thread Adapter for
Cap Lifters, ×1
4
Q Thread Seal Tape 1
R O-Rings for Hoses 4
S Valve Core Tools 2
T Flat Gaskets for cap lifters 2
U
O-Rings for 1/4 SAE to 5/16 SAE Adapters for
Cap Lifters
2
V R134a to R1234yf Quick Coupler Adapters 2
2.3 Package List
Check that all parts of this product are present and intact after unpacking. If any are damaged, ask
your local dealer or contractor for a new identical replacement.
7
2.4 Product Diagram
Oil Inlet
(Exhaust Port)
Filter
Motor
High-Pressure Gauge
High-Pressure Valve
High-Pressure Hose
Charging Hose
Refrigerant Cap Lifter
High-Pressure
Quick Coupler
Charging Valve
Base
Fan Cover
Power Switch
Handle
Hook
Power Cable
Gas Inlets
Reservoir
Window
Oil Drain Cap
Oil Tank
Low-Pressure Valve
Evacuation Valve
Low-Pressure Hose
Evacuation Hose
Low-Pressure
Quick Coupler
Low-Pressure Gauge
8
3 Installation
3.1 Preparing the Pump
• Vacuum pump oil is flammable and explosive and MUST be kept away from open flames
and sparks.
• NEVER ingest the oil or touch it with bare skin.
• Put on your dust mask, goggles, work gloves, ear muffs, and any other PPE necessary
for your work area.
• Be sure to use the required oil. Using other mechanical oils could impact the quality and
performance of your vacuum.
Tools and Parts Needed:
• Vacuum Pump Oil 46
• M4 Hex Wrench (Not Included)
Place the vacuum pump on a firm, level
surface.
Retighten the oil drain cap using an M4 hex
wrench.
1 2
9
Remove the cap of the oil inlet by turning it by hand and add the provided oil until the level is
between the MIN and MAX height marks BEFORE use.
To prevent spills, use a funnel (not included) that fits the oil inlet.
MAX
MIN
3
Add the cap, turning it into place.
Connect the pump to a stable, compatible,
and grounded power source.
4 5
or
US UK
10
3.2 Preparing the Gauge Set
Tools and Parts Needed:
• Thread Seal Tape
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
a. Turn the valves on the gauge set completely clockwise, FULLY closing its low-pressure (LP),
high-pressure (HP), and evacuation valves.
b. Pull away the protective caps from the valve ports of the three valves in Step a.
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
a. Wrap the port threads with some thread seal tape to ensure a proper seal. Avoid blocking
the ports.
b. Connect hoses to their corresponding ports using their locking nuts. The blue LP hose to
the port beside the LP valve, the red HP hose to the port beside the HP valve, the black
evacuation hose to the port below the evacuation valve.
DO NOT mix up the red and blue hoses, as they are NOT interchangeable.
1
2
a
a
a
b
b b
b
a
Hose end WITHOUT
copper cores inside
11
a. Pull away the protective caps from the couplers and wrap the tape around the threads of
the couplers.
b. Connect the blue and red hoses to their matching color quick couplers using the hoses’
locking nuts.
3
Hose end WITHOUT
copper cores inside
a
b
b
12
4 Operation
• Wear your dust mask, goggles, work gloves, ear muffs, and other PPE necessary for
your work area.
• Know your A/C system and take sufficient training BEFORE using this product for
optimal safety. A lack of training could cause failures and accidents.
• Avoid operating this machine in crowded, poorly lit, or cluttered areas.
• Ensure NO explosives or ignition sources nearby.
• Be sure that ALL connections ARE tightly secured.
• BEFORE starting work on an HVAC system, ensure it has been turned off.
• If you have used the pump before, check the pump’s oil volume. If the oil amount is
under the MIN mark, refill it until the level is between the MIN and MAX height marks
BEFORE use.
Check if the pump oil is emulsified and unclean. If it is, replace the oil. For instructions,
see 5.2 Replacing Vacuum Pump Oil on Page 22.
This chapter uses R134a refrigerant as an example.
Tools and Parts Needed:
4.1 Connecting the Gauge Set
Thread Seal Tape The Provided Vacuum Pump Oil 46
or Any Other Equivalent
(ISO 100 Or SAE 30)
M4 Hex Wrench
(Optional)
• Identifying the high and the low-pressure ports on your
A/C system is important. Generally, high-pressure ports are
physically bigger and higher than the low-pressure ports.
• Attach thread seal tape to all joints to make sure they
are connected well. Loose seals can affect your vacuum
performance.
High-Pressure Port
Low-Pressure Port
13
High-Pressure
Port
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
1. Connect the LP hose to the LP port on your A/C system. Make sure the hose is closed by
turning the port counterclockwise and the valve clockwise.
2. Connect the HP hose to the HP port on your A/C system. Again, make sure the hose is closed
by turning the port counterclockwise and the valve clockwise.
3. Connect the evacuation hose to the vacuum pump’s compatible gas inlet port.
If your A/C system requires R1234yf refrigerant,
use R134a to R1234yf Quick Coupler
Adapters (V) for help:
a. Turn the valves of the couplers FULLY
counterclockwise.
b. Push the adapters into the couplers while
pulling the sleeves as shown.
Low-Pressure
Port
Low-Pressure
Hose
E/C Hose
High-Pressure Hose
1
1
2
2
3
Compatible
Gas Inlet Port
14
4.2 Evacuating
1. Open both service ports of the high-
pressure and low-pressure hoses by turning
their valves clockwise.
2. Turn on the pump by flipping its power
switch to I. You should hear the vacuum
running once it is switched on.
• DO NOT leave the pump
unattended while it is in
operation.
• If you are trying to start the
pump in cold weather, open the
air inlet ports until the pump
reaches normal running speed.
Then, close them.
3. Open your gauges by turning their knobs COMPLETELY counterclockwise, and evacuation
should begin. The gauges will soon begin to dip below 0.
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
15
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
4. Wait for the vacuum pump to run for 30–45 minutes to evacuate the A/C system.
It’s NORMAL for a little steam to come out of the exhaust port, because it’s just the
condensation built up from the A/C system or the vacuum pump.
ALWAYS keep an eye on the reservoir window during evacuation. Stop the pump and
properly refill the reservoir if the oil level falls to MIN.
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
30-45
mins
5. Shut off the valves and the vacuum pump by turning the knobs COMPLETELY clockwise and
flipping the pump’s power switch to O.
16
4.3 Charging
• ALWAYS keep your refrigerant cans away from heat sources and direct sunlight.
• Be cautious NOT to open your refrigerant cans by accident in ANY way.
• Ensure that BOTH gauge valves ARE completely closed BEFORE starting your work.
• NEVER leave your refrigerant cans or the gauge set unattended when charging is ongoing.
• DO NOT overcharge.
Consult your A/C system’s specifications BEFOREHAND, finding the recommended
pressure that indicates a full charge, usually between 25 psi (1.7 bar) and 80 psi (5.5
bar).
• NEVER use incompatible refrigerant cans.
• Ensure that the blue LP valve is FULLY closed BEFOREHAND.
The provided cap lifters ONLY fit cans of SELF-SEALING style. For puncture-style cans,
use cap lifters with taper pins (not included).
6. Wait another 30 minutes to confirm there is
no leak in the system.
• If the needles stay the same, there is
no leakage and the vacuum is done.
• If the needles keep going towards 0,
there is a leakage. Locate and fix the
leakage.
This rarely happens if you have attached
the thread seal tape to all joints in §4.1
Connecting the Gauge Set.)
30
mins
PunctureSelf-Sealing
17
1. Disconnect the black evacuation hose from the pump.
2. Connect the charging gauge to the yellow charging hose following steps in 3.2 Preparing
the Gauge Set on Page 10.
3. Pull away the protective cap of the R134a cap lifter and connect the cap lifter to the yellow
charging hose.
If the connection port size is not compatible with the hose, use adapters (P) for help.
4. Turn the tap handle completely counterclockwise to close it.
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
1
2
3
4
18
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
6
7
5
5. Securely fit the tap onto your refrigerant can and open the can by turning the handle
completely clockwise.
6. Remove the cap of the valve core.
7. Press the valve core twice to remove the air in the hose.
8. Add the cap back.
9. Open the LP valve and the charging valve
by turning them counterclockwise.
Charging will begin and you will see the LP
gauge’s needle moving.
Pay attention to the window of the pressure
gauge set and ensure refrigerant flows
continuously and does NOT run out midway.
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
10. Start your A/C system and set it to the maximum cooling and fan speed.
19
11. Once the LP gauge reads the recommended
pressure, close the LP valve by turning it
completely clockwise to stop charging.
To confirm the outcome, check the A/
C air temperature using the provided
thermometer. If it is not as expected, add
more refrigerant.
VAC
OPEN
CLOSED
REF
OPEN
CLOSED
12. Close the LP service port that is connected
to your A/C system using the blue LOW
coupler.
13. Turn the handle of the cap lifter completely
counterclockwise to close your refrigerant
can.
If the can is empty, remove it from the tap.
If it is not, you can leave the tap there BUT
keep it FULLY closed UNTIL resuming use.
14. Remove couplers away from your A/C system by pulling back the coupler sleeves.
Disconnect the three hoses from the tap, quick couplers, and gauge set, then add their caps.
For optimal use, disconnect the pump from power.
Exercise caution WITH any remaining refrigerant that may come out.
20
4.4 Cleaning
• ALWAYS avoid direct pressurized spray.
• DO NOT flush or soak this product.
• NEVER use abrasive or caustic cleaners.
Clear any debris, dust, and oil off the external surfaces of the vacuum pump, pressure gauge set,
hoses, and other items as needed after use.
Recommended Tools:
• Soft dry brush
• Soft damp cloth
• ANSI or OSHA-compliant compressed air
21
5 Maintenance
5.1 General Maintenance
• ALWAYS disconnect this product from power and A/C systems BEFORE performing
ANY maintenance tasks.
Failure to do so can cause accidents, leading to equipment damage and personal injury.
• For tests or other purposes that require power or system connections to be restored,
wear INSULATED hand protection as well as ANSI or OSHA-compliant breathing and
eye protection.
• Be careful NOT to scrape or abrade the hoses and NOT to drop the pump or gauge
set on hard or rough surfaces.
• Disconnect the pump from power between uses and before undertaking any cleaning,
maintenance, or repairs.
• Clean the exterior of the pump with a soft damp cloth. DO NOT use harsh abrasives or
caustic chemicals.
• NEVER drop the pump on hard or rough surfaces.
• Clear any debris, dust, and oil off the external surfaces of the vacuum pump and other items
as needed after each use. DO NOT allow any electrical component to become wet or damp.
Recommended tools: Soft dry brush, soft damp cloth, ANSI or OSHA-compliant compressed air.
ALWAYS avoid direct pressurized spray. DO NOT flush or soak this product. NEVER use
abrasive or caustic cleaners.
• Check the vacuum pump and the gauge set for any wear, damage, and malfunction after each use.
If any part of the pump is damaged, worn, or shows signs of malfunction, repair or replace it
with a new identical part before further use, especially the filter.
If any gasket, copper core, or O-ring preinstalled in the refrigerant cap tap, quick coupler, or
hose is damaged or worn, replace it with its spare using the valve core wrench and/or dual-
purpose screwdriver. If any other part of the gauge set is damaged or worn, have it repaired
or replaced before further use.
• DO NOT dismantle the pump or gauge set WITHOUT professional training. ONLY trained
technicians should do repairs to the internal components.
• ANY consequences of arbitrary modification WILL void ALL warranties stated or implied.
• If the pump will not be used for an extended period, clean all items, seal all ports with their
protective caps, and store it and its accessories in a cool, dry, and clean place away from
flammables, explosives, caustics, and heat sources, and inaccessible to children.
22
5.2 Replacing Vacuum Pump Oil
Be mindful of the oil behind the reservoir window. If it turns turbid, replace it as follows.
Tools and Parts Needed:
• The vacuum pump oil 46 or any other equivalent (ISO 100 or SAE 30)
• M4 hex wrench
1. Make sure the oil remains warm.
Note: If unsure, run the pump for about 10 minutes to heat the oil sufficiently.
Remember to deactivate and unplug the pump BEFORE continuing.
2. Remove the oil tank by unscrewing the four bolts using a hex wrench.
3. Remove the oil drain cap using your M4 hex
wrench.
4. Drain the remaining oil into a suitable
container.
5. Refill the tank with new oil until the level is between the MIN and MAX height marks.
6. Add the cap and the oil tank back into place.
23
6 Troubleshooting
Problems Possible Solutions
Low vacuum
or leakage
Check if the vacuum itself has leakage.
Remove the connected hose, turn on the pump, and close the gas inlet ports.
• If oil mist continues to escape without any gas entering the pump, it
indicates a leak inside the vacuum pump. Do the following to repair it:
a. Check if the gas inlet port is loose and tighten if so.
b. Check if the rubber ring in the gas inlet port is damaged and replace if
so.
c. Check if the oil inlet port is unclean and clean if so.
• If there is no continuous oil mist, check all connections, such as the
connecting hoses, the container, and if the O-rings on the hoses are
missing or damaged. There could also be a possibility of leaks in the A/C
system itself.
Check if the oil inlet of the pump is blocked or the oil supply is insufficient.
Open the oil tank, clean the pump chamber inlet, and clean the oil inlet and
the filter.
Check if the pump oil is emulsified and unclean. If it is, replace the oil.
Check the size of the vacuumed container, recalculate, and select the
appropriate type of pump.
Check if the gap caused by parts wear is increased. If it is, repair or replace
the pump.
Oil leakage
Check if the connections of the oil tank are loose or damaged. If they are,
retighten all bolts around the oil reservoir and adjust the O-rings.
Check if the pump’s support surface is flat and level.
Oil ejection
Check if the oil is over the MAX mark. If it is, discharge oil until the level is
between the MIN and MAX height marks.
The inlet pressure is too high for a long time.
Choose the right pump to increase the pumping speed.
The vacuum
pump cannot
turn on or it
automatically
turns off.
The motor temperature is too high.
The thermal protector will deactivate your pump if its motor reaches 160 ° F
(70 ° C). Wait about 15 minutes to let it cool down and restart your pump.
24
Problems Possible Solutions
The vacuum
pump cannot
turn on or it
automatically
turns off.
The oil temperature is too low.
Move the pump to a warmer location and
wait a while before reactivating it.
Or, remove the gas inlet cap and
the oil filter, and turn the fan blades
counterclockwise with a flat-head
screwdriver. After the pump turns on
normally, add the gas inlet cap and the
oil filter.
Check if the motor, power supply, or circuit board have problems. If they do,
have them repaired by technicians.
Check if some foreign matter dropped into the pump and remove if any.
Check if your power supply is correct and functions well.
Check for damage to the power cable. If necessary, ask your local dealer or
contractor for a new identical replacement.
If both are fine, firmly reconnect the power cord to the power source and inlet.
The overload protection occurs. If this is the case, keep the switch on, remove
the power cable, wait for about 30 seconds, check and solve why the
overload occurs, and then reconnect the power cable.
Oil backflow
This pump is equipped with a simple anti-backflow device, but there is a 5%
chance of backflow in actual use due to factors such as pressure, impurities,
and obstruction.
After operation, disconnect the the vacuum pump and the gauge set or close
the middle valve BEFORE turning off the vacuum pump to prevent backflow.
Incompatible
gauges
Replace with the compatible SAE parts.
The needle
does not
return to zero.
Pry open the calibration cap, and use
a flathead screwdriver to calibrate the
needle.
Scan for the latest user manual
Rev. 20 Feb. 2025
