Nautilus MX3-500 User manual

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#LMANN05 Revised: 06-26-13
Nautilus MX3-500
Operating Manual

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Nautilus MX3-500 Operating Manual
TABLE OF CONTENTS
TOPIC PAGE
•Introduction 3
•Technical Specifications 4
•Optional Equipment 5
SECTION 1: Operational Safety
•Electrical Safety 6
•Mechanical Safety 7
SECTION 2: Operation Procedures
•Vacuum Connections 8
•Electrical Supply 9
•Water Supply & Chemicals 10
•Solution Hose & Pump Priming 13
•Vacuum Hose 14
•Foam Downer 15
•Pump-Out System 16
•Pressure Adjustments 17
•Shutdown Procedures 18
•Accessory Storage 19
•Troubleshooting 20
•Solution Flow Path 23
•Wiring Diagrams 24
SECTION 3: Maintenance/ Technical
•Maintenance 27
•Drawings & Parts Lists
oPump 36
oAuto-Fill 38
oPressure Unloader 39
oPump-Out Pump 40
oParts Pictures 41
oParts List 52
oHose List 55
•Warranty 56

3
Introduction
Congratulations on your purchase of the Hydro-Force Nautilus MX3-500. The
MX3-500 is designed to give truc mount-level performance in a portable
machine that combines versatility with ease of transport. Years of experience,
engineering, and planning have gone into the design and manufacturing of the
MX3-500. We ta e a great deal of pride in the MX3-500; our goal is no less than
your complete satisfaction.
The Hydro-Force Nautilus MX3-500 is intended for commercial use only.
This manual will provide users with the nowledge required to operate the
Nautilus MX3-500 safely, to understand how to properly operate and maintain the
machine, and to ensure that the equipment operates at its maximum performance
level.
All users must read and understand this manual completely before
operating the machine.
Always maintain this manual in legible condition adjacent to the Nautilus MX3-
500, or place in a secure location for future reference.
Any questions pertaining to the operating or servicing of this unit should be
directed to your nearest Hydro-Force distributor.
This manual is written specifically for the Nautilus MX3-500 portable extractor
units manufactured by:
Hydro-Force
4282 South 590 West
Salt La e City, UT 84123
801-268-2673
801-268-3856 FAX
Information in this manual is subject to change without notice and does not
represent a commitment on the part of Hydro-Force or its parent or affiliated
companies.

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Technical Specifications
MX3-500 High Pressure Extractor
Height: 42-1/4”
Length: 34-3/8”
Width: 23-3/8”
Weight: 136 lbs.
Solution Tank Capacity: 12 gallon
Recovery Tank Capacity: 12 gallon
Solution Pump: Pump-Tec 207 pump with 1/2 HP Motor - 0-500 psi – 1.06 gpm
Vacuum Motors: Two AMETEK Lamb 5.7” diameter 3-Stage – tangential discharge
Can be operated in series or parallel configuration
Pump-out Pump: FloJet 120VAC 4.5 gpm
(Optional)
Power Draw: Cord 1 – 15.93Amp wide open / 12.23amp full load
Cord 2 – 10.40Amp wide open / 6.70amp full load
(Add 1.50amps to Cord 2 for units with optional Pump-Out Pump)
Standard Equipment
Vacuum Connection: 2” Barb or 2”Male Flash Cuff with 2” Male NPT
Vacuum Hose: 25’ X 1-1/2” with 1-1/2” cuff & 2” cuff
2” Female Flash Cuff x 1-1/2” hose adapter
Carpet Wand: 1-1/2” SS Dual Jet S-Bend Wand – AW29
Accessory Mount Hardware: Four 1/4-20 x 5/8” SS Screws and Washers
HP Solution Hose: 25’ x 1/4” with 1/4” male & female quick connects
Power Cords: 2 – 25’ x 12gauge with male & female plug ends
Electrical: Dual Circuit Indicator
10amp Pump Circuit Breaker
Internal Component Cooling Fan
Optional Features:
Auto Fill System with chemical draw:
Metering Tip Kit: 14 different tips for changing chemical dilution rate
Water Supply Hose: 50’ x 3/8” with 1/4” female quick connect &
Female garden hose fitting
Auto Pump-out System:
Pump-out Hose: 50’ x 3/4” with male & female garden hose fittings

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Additional / Optional Equipment
Wand Glide – Delrin AW529D
Wand Glide – Teflon AW529T
18” Bottom Velcro Strap for Wand Holder NM5841
Hy-Dry Deluxe Upholstery Tool: AW50D
SX-7 Tile & Grout Tool: AW101
Gekko Tile & Grout Wand: AR54
Gekko Hand Tool: AR52
Gekko SX-7 Tool: AW102
1-1/2” Vacuum Hose: (Sold per foot – No cuffs) AH36
2” cuff for 1-1/2” Vac Hose: AH46
1-1/2” cuff for 1-1/2” Vac Hose: AH42
1-1/2” Hose Connector PVC: AH74
HP Solution Hose 1/4” X 25’ w/M-F Quick Connects AH79D
1/4” Male Quick Connect: AH102B
1/4” Female Quick Connect: AH101B
Pump-out Hose: AH65
Hydro Filter II: AC10
Replacement Screen for Hydro-Filter II: AC10C
Metering Tip Kit: PDE001
12/3 X 25’ Power Cord: AX32
12/3 X 50’ GFCI Power Cord: NM4407
AX108 AX108
A
C10
AW101
AR52
AR54
AW50D
N 4407
AX108

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Safety
CAUTION! This machine is an electrical appliance. Care must be
taken to reduce the risk of electrical shock.
•READ AND UNDERSTAND ALL INSTRUCTIONS BEFORE OPERATING THE MX3-500.
•To reduce the ris of property damage or injury, repairs to electrical systems should only be performed by
experienced technicians. Contact your distributor for assistance. Unplug machine power cord from outlet
before performing any repairs on the extractor.
•This machine shall be grounded while in use to protect the operator from electric shoc . The machine is
provided with a three-conductor cord and a three-contact grounding type attachment plug to fit the
proper grounding type receptacle. The green (or green and yellow) conductor in the cord is the grounding
wire. Never connect this wire to other than the grounding pin of the attachment plug.
•This machine is for use on a nominal 120-volt circuit and
has a grounding plug that resembles the plug illustrated in
the s etch to the right. Ma e sure that the machine is
connected to an outlet having the same configuration as
the plug. No plug adapter should be used with this
machine.
•The power cords supplied with this machine are properly
sized to handle the electrical load of this machine and
properly grounded as described above. Any extension
cords used with this machine must be similarly sized and
grounded to assure safe operation. A properly sized
GFCI protected cord can be used for additional protection.
•The two power cords must be plugged into separate circuits during operation. The Dual Circuit Indicator will
ensure that the two cords are operating on different circuits (see Page 9 for details.)
•Do not use the MX3-500 outdoors, in standing water or on wet surfaces. Do not store the MX3-500 in wet
conditions. If extractor is lea ing, unplug machine power cords from outlets before approaching or touching
machine.
•Do not unplug power cord by pulling on the cord. Grasp the plug end when unplugging the cord. Do not pull
the extractor by the cord. If cord or plug is damaged, do not use cord. Replace with new cord or repair as
needed before use.
•Overloaded circuit may not always trip circuit brea er. Reduced voltage to machine on overloaded circuit will
prevent components from operating properly.
Section
1

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WARNING! This machine must be protected from conditions which may
damage the pump, tank, hoses and other components.
•Freezing of water in this machine will cause serious damage. The MX3-500, solution hoses, and tools
must be protected from freezing temperature. Store, transport, and use this equipment only in temperatures
well above freezing. (32ºF or 0ºC). If you suspect the MX3-500 has been frozen, do not plug in or turn on
machine until you are sure it has thawed completely.
•If the equipment cannot be stored or transported in a warm environment, it can be guarded from freezing by
running an anti-freeze solution through the incoming water lines, chemical feed system, solution pump, solution
lines, tools and pump-out pump. The machine is filled at the factory with anti-freeze to eliminate damage during
shipment in cold weather.
oThe anti-freeze solution must be completely flushed from the machine before it is returned to service.
•The MX3-500 must not be used to pic up flammable or combustible materials or used in areas where these
materials may be present.
•Solvent-based or water-based solutions containing solvents may damage the pump, hoses, and other
components. Do not assume chemical compatibility. Contact your distributor or Hydro-Force if you have
questions regarding the compatibility of your chemicals with the machine.
•Do not clean with solutions that are at temperatures above 130ºF.
•Rinse the solution tan , chemical system, and pump with fresh water after each day’s use.
•Do not allow pump to run dry. Always maintain adequate solution level to supply solution pump.
•HP hoses may rupture if worn or damaged. Do not use HP solution hoses if hose covering is cut, bulging, or
otherwise damaged. Examine HP solution hoses daily and replace or repair hoses as needed.
•Use a Hydro-Filter II and clean the recovery tan daily to eep pump-out filter and pump from becoming
clogged. Store the MX3-500 with the recovery tan lid open.
•Keep Vacuum Inlet Filter clean and chec float for proper operation. Do not operate the MX3-500 without the
Vacuum Inlet Filter in place. Use defoamer to eliminate foam build-up during cleaning and prevent
foam/moisture from entering vacuums.
***Use common sense to protect yourself and others while using this equipment.***
•Keep pets and children away from the machine when in use.
•Keep all body parts, hair, and loose clothing away from openings and moving parts. Always wear appropriate
clothing and safety equipment when operating unit.
•Use extra care when cleaning on stairs. Wet carpet on stairs can be slippery.
•Do not move the MX3-500 up or down stairs when tan s are full of water. Drain solution and recovery tan s,
and secure base latches before moving unit up or down stairs. Lift using only the appropriate handles.
•Water may be spilled, drip, or be exhausted from vacuums during operation. Place unit in area where water will
not cause damage or use drop cloth to protect surfaces.

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Vacuum Connections
The MX3-500 has a unique vacuum system which allows you to
connect your vacuums in either parallel or in series. Vacuum
connections can be changed quickly, with only a screw driver.
While there is debate on which vacuum alignment provides the best
extraction, this much is true:
•Two vacuums in series: The vacuum lift is increased by 1.6
times the rating of a single vacuum, while the air flow stays the
same as a single vacuum.
•Two vacuums in parallel: The vacuum air flow is increased by
2.0 times the rating of a single vacuum, while the lift says the
same.
Air flow is usually measured in cubic feet per minute, indicated as
CFM.
Lift is usually measured in inches of water column, indicated as
“H2O or “WC.
To connect vacuums in parallel:
1. Connect the discharge / exhaust hose from vacuum #1 to the
exhaust pipe on machine base.
2. Place the rubber stopper into the vacuum inlet port of vacuum
manifold number two.
3. Open vacuum gate valve and attach the Gate eeper to prevent
accidental valve closure.
When connected in parallel, both vacuums must be running during
cleaning. Vacuums cannot be operated individually.
To connect vacuums in series:
1. Connect the discharge / exhaust hose from vacuum #1 to the
vacuum inlet port of vacuum manifold number two.
2. Place rubber stopper into the exhaust pipe on machine base.
3. Remove Gate eeper and close vacuum gate valve.
When connected in series vacuums can be operated individually if desired during
cleaning.
Warning: Always secure the Gate Valve Open with the
Gatekeeper when connecting the vacuums in Parallel.
Closing the Vacuum Gate Valve with the hoses connected
in the Parallel configuration may cause damage to
Vacuum #2.
Section
2
GATEKEEPER

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Operation Procedures
Knowledge of the proper operation of the MX3-500 is required to ensure
user safety and efficient performance of the extractor.
SET UP AND OPERATION
1. Electrical Cords:
Two 25’ power cords are supplied with the Nautilus MX3-500. The amperage required by each cord requires
that the two cords be plugged into separate circuits:
•Cord #1 (Left side) will supply power to vacuum #1, solution pump and cooling fan.
•Cord #2 (Right side) will supply power to vacuum #2 and the optional waste pump if so equipped.
This machine should be able to run when both cords are connected to separate 15amp circuits. If other
electrical equipment is connected to the circuit during operation; 20amp circuits may be required.
20amp circuits are usually found in kitchens and bathrooms. An overloaded circuit will not trip the
circuit brea er immediately, but may not provide sufficient voltage for proper operation and the brea er will
eventually trip.
Plug the two power cords into two outlets from different circuits. If the Dual Circuit Indicator green light
fails to light, you may be on the same circuit and may need to select a different plug for one of the cords. If
the Dual Circuit Indicator green light comes on, you are plugged into two different circuits. Proceed with
your set-up procedure.
(Dual Circuit Indicator light may take up to 30 seconds to recognize the two circuits and turn ON.)
If a circuit brea er trips or the pump circuit brea er trips during operation, reset the brea ers and move the
cord to another outlet as needed.
Power Cord – AX32
25’ – 12 gauge M-F Plugs
Cord #1
Cord #2
Breaker Buddy
Dual Circuit Indicator Light

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2A. Water Supply & Chemical Mixing– Manual Fill:
•Pour up to 12 gallons of hot water into the solution tan at the front of the machine. The water
temperature cannot exceed 130°
°°
°F.
•Measure and add the appropriate amount of the desired liquid chemical to the water in the solution tan .
The amount of chemical will vary depending on the type of chemical used, the amount of water in the
tan , and the material being cleaned; consult the chemical pac aging for specific mixture ratios.
•Powdered chemicals should be dissolved in water before adding to the water in the solution tan .
DO NOT RUN OUT OF WATER WHILE USING THE MACHINE! Ensure that the tank
contains enough water to complete each job. If the water level is low: stop cleaning, turn off the
pump, and refill the tank. Running the pump dry will damage the pump and void the warranty.
2B. Water Supply & Chemical Dilution – Optional Auto-Fill System:
•The chemical dilution rate is controlled by the metering tip, and the dilution rate can only be changed by
changing the metering tip (See “How to Change the Metering Tip” on Page 11 for instructions.)
Chemical Feed Setup:
•Remove the chemical feed hose from the solution tan . Ma e sure float is attached to valve and hanging
freely, above the bottom of the solution tan . Adjust float height to maintain adequate water level.
•Place the end of the chemical feed hose into a container of liquid chemical.
•If the tip is removed, and the proportioning system operated with no tip, the dilution rate will be 8:1 (the
equivalent to adding 16-1/4oz of chemical to each gallon of water.)
•The recommended tip for use with the MX3-500 is the turquoise tip with a dilution rate of 256:1. This
means that for each gallon of water flowing into the machine, 1/2 ounce of chemical will be added.
•If a fresh water rinse with no chemical is desired, simply leave the chemical feed hose inside the
solution tank.
Proportioning Valv
e
Chemical Feed Hose
Float Hanger
Float
Pour appropriate amount of hot water into
solution tank
Add appropriate amount of chemical to water
in solution tank
Float Valve

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How to Change the Metering Tip:
•Remove the chemical feed hose from the barb on the side of the proportioning valve.
•Unscrew and remove the old tip.
•Screw in the proper tip for your chemical tip and place the hose bac on the barb
Metering Tip Kit (Hydro-Force Item PDE001) contains 14 different colored metering tips, allowing
dilution rates from 11:1 up to 427:1. Refer to the chart below to select the tip that meets the dilution rate for
your chemical application.
•For example: if you require 1-1/2 ounces of chemical per gallon of water, change to the red metering tip
with the dilution rate of 85:1.
•The dilution rates are based on chemicals with water-li e viscosity. Thic er (more viscous) chemicals will
dilute at a different rate.
•For powdered chemicals, a liquid concentrate must be made. Mix the concentrate according to the
manufacturer’s directions, and then select the appropriate metering tip.
•Contact your distributor or Hydro-Force if you have questions about your chemical.
Metering Tip Application Chart:
Metering Tip Kit – PDE001
Turquoise Tip
Dilution 256 - 1
Red Tip
Dilution 85 - 1
TIP
COLOR
CHEMICAL DILUTION RATES
OZ / GAL (RATIO)
TAN 0.30 (427:1)
ORANGE 0.40 (320:1)
TURQUOISE 0.50 (256:1)
PINK 0.75 (170:1)
LIGHT BLUE 1.00 (128:1)
BROWN 1.12 (114:1)
RED 1.50 (85:1)
WHITE 1.75 (73:1)
GREEN 2.00 (64:1)
BLUE 2.50 (51:1)
YELLOW 3.75 (34:1)
BLACK 5.00 (26:1)
PURPLE 8.50 (15:1)
GRAY 11.50 (11:1)
NO TIP 16.25 (8:1)
Proportioning Valve

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Water Supply:
•Once the correct metering tip is in place:
oConnect the Auto-Fill Water Supply Hose to the water inlet (the male quic -connect on the front
of the machine.)
oConnect the other end of the hose to a water faucet, and then turn on the water.
•Hot water can be used as long as the temperature does not exceed 140°F.
•Faucet adapter its (Hydro-Force item #AX21 & AX22) are available that allow connection to different
types of faucets if needed.
To adjust the water level in the solution tank:
•Turn off the water supply.
•Adjust the length of the chain connecting the float bottle to
the float valve. Unhoo the float from the beaded chain on
the valve. Unsnap the hoo from the beaded chain on the
float.
Move the bottle down to decrease the water level.
Move the bottle up to increase the water level.
•Snap the bac onto the float chain & hoo the float bac
onto the valve chain.
•Turn the water supply bac on.
If the chemical is not drawing, or if the tan is not filling
or is overflowing, refer to the trouble shooting guide, or
contact your distributor for assistance.
Connect the Auto-Fill Water Supply Hose to Solution Inlet
(Male quick connect on the front of the machine.)
3/8” id X 25’ with F Quick Connect & F Garden Hose Fitting Float Valve
Float Bottle
Connect the Auto-Fill Water Supply Hose to a
faucet and turn on the water
Chemical
Feed Hose
Float Hanger Hook

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3. Connection of Solution Hose:
Connect the high pressure solution hose to the solution outlet (female quic connect on the front of the
machine). Connect the other end of the hose to the male quic connect on the cleaning tool. When you are
ready to start cleaning, turn the solution pump switch to the ON position
4. Priming the High-Pressure Pump:
Before priming the pump, make sure your solution hose and tool are connected to the machine.
Once water is in the solution tan , the high pressure pump must be primed:
•There is a prime valve located on the lower bac portion of the machine.
•Turn on both vacuums and the solution pump. Press the priming lever for a few seconds while you
bloc off the vacuum inlet with your hand. The vacuum will pull solution through the pump and
prime valve into the vacuum tan .
•Let off the prime valve and your pump is primed. As long as there is solution in the tan the pump
should remain primed. You can now proceed with cleaning or turn the pump off and continue your
set-up.
If the pump still does not prime, or if flow is low or unsteady, chec the hose from the solution tan to the
pump (as well as the filter) for clogging, in s, or restrictions. Clean or replace hose and/or filter and repeat
the priming procedure.
If you are having trouble with the pump, refer to the trouble shooting guide or contact your distributor for
advice or assistance.
Connect the male end of the HP Solution Hose
Assembly to the female solution outlet fitting on
the machine. Connect the female end to the
cleaning tool.
HP Solution Hose Assembly – AH79D
1/4” id X 25’ with M-F Quick Connects
PUMP PRIMING VALVE
PRESSING THE PUMP PRIMING VALVE

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5. Connection of Vacuum Hoses:
The vacuum connection port on the machine can be either a 2” hose barb or 2” male Flash Cuff. Both are
included with your MX3-500. The desired connector can be threaded into the vacuum port on the front of
the machine.
A 2” female Flash Cuff 1-1/2” hose adapter is also included to connect the 1-1/2” vacuum hose to the 2”
male Flash Cuff on the machine.
A 2” hose cuff for 1-1/2” vacuum hose is included to connect the 1-1/2” vacuum hose to the 2” hose barb
on the machine.
With the proper cuff attached to the 25’ Vacuum Hose, the 25’ vacuum hose is then connected to the vacuum
connection port on the MX3-500. The other end with the 1-1/2” cuff is connected to the cleaning tool.
When ready to begin cleaning, turn both vacuum switches to the ON position. If connected in series, the
MX3-500 can be operated with only one vacuum for cleaning delicate fabrics. (See Vacuum Connection
instructions on Page 8) In most situations you will turn both vacuum switches ON.
TO PRIME THE SOLUTION PUMP:
1. TURN ON BOTH VACUUMS
2. TURN ON THE SOLUTION
PUMP
3. BLOCK OFF THE VACUUM
PORT
4. PRESS THE PUMP PRIMING
VALVE
Vacuum Hose connection with standard barb
and vinyl cuff
Vacuum Hose connection with Flash Cuffs
BLOCKING THE VACUUM PO
RT TO PRIME PUMP

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Optional Foam Downer:
A ey problem with portable extractors is that they have small tan s where foam dissipates slowly. If you
have had issues with foam or are anticipating foaming problems, you will want to connect a Foam Downer.
Foam can be drawn into the vacuums before the vacuum shutoff closes. Foam and water blowing out the
vacuum ma es a big mess, can decrease vacuum lift and damage the vacuum motors.
The Foam Downer ills foam as waste water enters the machine. Place a container of liquid defoamer on the
top of your MX3-500. The vacuum air flow siphons the liquid defoamer through Foam Downer into the
vacuum tan , brea ing down the foam before it can cause any damage or ma e a mess.
•Mounts and is ready to use in seconds
•Uses defoamer very economically
•NO LABOR is involved to spray or spread defoamer – it’s all automatic
•Keeps silicone defoamers off the floor where they can cause resoiling problems
The Foam Downer is an attachment that allows the vacuum to draw a small amount of defoamer in a
constant slow flow into the waste tan of the Nautilus. We recommend using a diluted defoaming solution of
four ounces of defoamer to one gallon of water (1-32). Place the draw tube into the gallon of diluted
defoamer and open the needle valve one half turn as your starting point. If this is not sufficient to brea
down the foam you can open the valve more or add more defoamer to the water to ma e a stronger solution.
With the valve open one half turn it will ta e approximately one half hour to drain the gallon of diluted
defoaming solution.
FOAM
DOWNER
AH17
FOAM DOWNER cannot be used
with 2” Male Flash Cuff connector
on machine. Remove 2” Male Flash
Cuff and install 2” hose barb as
needed.
HOSE HOOK
AH95

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6. Connection of Optional Pump-Out Hose:
If your machine has the Optional Auto Pump-Out System you may want to connect the Pump-Out Hose.
The pump-out hose is a 50’ section of 3/4” garden hose. (Use of smaller diameter hose may reduce flow.)
•Remove the cap from the pump-out outlet fitting on the bac of the machine.
•Connect the pump-out hose to the outlet fitting.
•Place the other end of the hose in a commode or drain connected to the sanitary sewer system.
•Secure hose end to prevent movement during pumping.
Use defoamer to prevent foam build-up in recovery tank during cleaning and to keep
foam/moisture from entering vacuums.
Use Hydro Filter II inline filter to trap and remove debris from the waste water before it
enters the recovery tank. Excess debris in recovery tank may clog Pump-Out filter. Clean
Filter as needed during use.
Do not turn the Waste Pump switch ON unless pump-out hose is connected and has been
routed to a proper drain.
The Waste Pump does not use a float switch and will run as soon as the Waste Pump switch
is turned ON. It is made to run continuously while cleaning, as this type diaphragm pump
can run dry without damage.
When ready to begin cleaning, turn the Waste Pump switch to the ON position.
If not using the waste pump-out, the pump-out hose does not need to be connected. When the recovery tan
fills during cleaning, the float assembly in the vacuum inlet filter will rise and will automatically shut off the
vacuum air flow to prevent the recovery tan from overfilling and waste water from getting into the vacuums.
When this occurs:
•Immediately shut off the vacuum switches.
•Drain the recovery tan .
oTurn off the pump switch while draining the tan .
oTurn pump switch bac upon resumption of cleaning.
•Close the drain valve and turn the vacuum switches bac on when ready
to resume cleaning.
If the pump-out or vacuum shutoff is not wor ing properly, refer to the trouble
shooting guide or contact your distributor for advice or assistance.
Connect the Female
Garden Hose Fitting
end of the Pump-out
Hose to the outlet fitting
on the back of the
recovery tank. Place the
other end of the pump-
out hose in a sanitary
drain.
Float Shutoff Assembly
Draining the Recovery Tan
Pump-out Filter

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7. Pressure Adjustment:
To ma e it easier to chec and adjust the pressure, the pressure gauge and the pressure regulator/unloader are
mounted on the control panel on the front of the machine. When the high-pressure solution pump is on and
primed, pressure will show on the gauge only while the tool is being sprayed. When the tool is sprayed the
gauge will display the pressure being delivered to the tool. When the tool is not being sprayed the gauge will
return to zero.
•To decrease the pressure, turn the blac nob on the pressure regulator/unloader to the left (counter-
cloc wise.)
•To increase the pressure, turn the blac nob on the pressure regulator/unloader to the right
(cloc wise.)
•To adjust pressure to your tool and surface requirements:
oSpray the tool.
oChec the pressure on the gauge.
oRe-adjust as needed to set the machine at the desired pressure.
oChoose the pressure setting that best meets your type of cleaning.
Pressure gauge & Regulator/Unloader
To increase the solution pressure, turn the
regulator/unloader knob clockwise.
To decrease the solution pressure, turn the
regulator/unloader knob counter-clockwise.
The maximum pressure setting is 500psi; however,
the highest pressure attained is dependent on the
amount of water flow at the tool:
•Smaller jets and lower flow will allow for
higher pressure at the tool.
•Larger jets and higher flow will lower the
maximum pressure attained at the tool.
The desired setting will depend on the type of
cleaning and tool used. For example:
•Carpet Cleaning with 2-jet AW29 wand: 400psi
•Upholstery Cleaning with AW50D tool: 200psi
If adjusting or maintaining pressure becomes a
problem, refer to the trouble shooting guide or
contact your distributor for advice or assistance.

18
Shutdown Procedures:
•If using the optional auto-fill system, turn the water supply off before finishing each job. This will allow
use of the water and chemical already in the tan , and will reduce the amount of excess water to be
disposed of later.
•When finished cleaning, turn off all switches.
•If the optional auto-fill system was used and there is still water in the solution tan , push the float down
to release the water inlet hose pressure before disconnecting the hose from the faucet. Disconnect the
water inlet hose from the quic -connect on the front of the machine.
•Disconnect the solution hose and vacuum hose from the cleaning tool. Pull valve trigger to release
pressure from the hose before disconnecting solution hose from cleaning tool.
•If a Hydro Filter II inline filter was used, disconnect the Hydro-Filter II from the vacuum hoses and clean
the filter as needed. Replacement filter screens are available
(AC10C.)
•Disconnect the vacuum hose and solution hose from the machine.
•If water remains in the solution tan , use the vacuum hose and
vacuum the excess water from the tan .
•If the optional auto-fill system was utilized, place the chemical feed
hose bac into the solution tan .
•If the optional Auto waste pump-out system was used:
oTurn the waste pump switch “on” to pump out any remaining water from the recovery tan .
oTurn switch off, remove the pump-out hose from the outlet fitting and replace the cap.
oRoll up hose toward drain to remove remaining water from hose.
oConnect ends of hose together to prevent dirty water from dripping from hose during transport.
•Disconnect the power cords from the outlets and from the machine.
•Remove the float shutoff assembly from
the recovery tan and clean vacuum shutoff filter as needed.
Clean Pump-Out filter screen.
Replace shutoff assembly and tan lid.
•Drain any remaining water from the recovery tan
and dispose in sanitary drain. Do not use the same
buc et to drain the tan that you use to fill the tan .
•Roll up all hoses and cords.
Collect and store extractor, all tools, and accessories.

19
Accessory Storage Options:
The MX3-500 is designed to ma e it easier for the
operator to transport the machine and the most common
cleaning accessories.
Bucket & Sprayer Storage
The top of the MX3-500 is sized and recessed to hold a
five gallon buc et or two one-gallon chemical bottles as
well as two 2QT sprayers.
Power Cord Storage
The bac of the MX3-500 has two sets of cord wraps to
hold two 12/3 x 25’ power cords.
Carpet Wand Storage
The front of the MX3-500 is designed to hold a S-Bend
Carpet wand and has two straps to hold it securely.
Optional strap for larger wands available
Other Tool & Hose Storage
Each side of the MX3-500 has a set of molded in threaded
inserts to which holders can be attached to hold other
accessories or supplies ma ing it much easier to move
around. Four 1/4-20 x 5/8” mounting screws & washers
included.
Molded in Threaded Inserts
for Side Mount Holders
Wand Holder Straps

20
Troubleshooting –
Nautilus MX3-500
Problem
Cause
Solution
Machine not Building circuit breaker tripped. Reset breakers or move cords to other outlets
turning on - Faulty power cord Replace cord (AX33)
No power Faulty switches or internal wiring Check wiring & test switches - Repair as needed *
Solution
Pump Building circuit breaker tripped. Reset breakers or move cords to other outlets
not running Pump circuit breaker tripped Reset breaker – Check available circuit power & pump
Faulty power cord Replace cord (AX33)
Faulty switches or internal wiring Check wiring & test switches - Repair as needed *
Pump motor breaker tripped Push in reset button on pump motor &/or external breaker
Pump motor faulty Replace pump motor (PT066)
Pump seized - trips breaker
Repair or replace pump head & bearing (PT065) - Check
motor and/or replace complete pump & motor assy. (AP52)
Low Solution Jets too large for pressure desired
Check jets size & flow rates use smaller jets or lower
pressure
Pressure Jets worn allowing too much flow Replace jets
And / or Solution inlet filter plugged Clean or replace filter
Pulsation Hose from solution tank restricted Repair or replace hose
Pump intake hose or fittings
leaking Repair or replace hose. Tighten clamps or replace fittings
Pressure regulator sticking Lube o-rings on regulator shaft – PAGE 33
Pressure regulator faulty Repair or replace pressure regulator / unloader (PT017)
Filter screen or jets plugged on
tool Clean out filter or jets
Solution tank empty Add water to tank - Check & repair auto fill assembly
Pump not primed Perform pump priming procedure
Priming Valve Stuck Open Repair or replace the Priming Valve
Pump faulty Repair or replace pump (PT065 or AP52)
Pressure Gauge faulty Replace gauge (PT063)
Tool valve faulty Repair or replace valve
Quick connects or hoses restricted Clean out or replace quick connects and/or hoses
Can't connect Pressure in lines Release pressure
solution hose Quick connects faulty Replace quick connects (AH101B, AH102B)
to machine Wrong style/size quick connects Replace quick connects to match connects on machine
* To reduce the risk of fire electrical shock or injury repairs to wiring should only be performed by
experienced service technicians.
If you are not experienced in checking electrical wiring contact your nearest authorized service
center to perform tests and repairs to wiring and switches.
Section
2
Troubleshooting