Nautilus MX3-500RP User manual

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LMANN14 Revised: 06-04-2014
Nautilus MX3-500RP
Operating Manual

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Nautilus MX3-500RP Operating Manual
TABLE OF CONTENTS
TOPIC PA E #
•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 37
oPressure Unloader 39
oPump-out Pump Assembly 40
oParts Pictures 41
oPump-Out Connections 50
oParts Lists 51
oHose List 54
• Warranty 55

3
Introduction
Congratulations on your purchase of the Hydro-Force Nautilus MX3-500RP. he
MX3-500RP is designed to give truckmount-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
MX3-500RP. We take a great deal of pride in the MX3-500RP; our goal is no less
than your complete satisfaction.
The Hydro-Force Nautilus MX3-500RP is intended for commercial use
only.
his manual will provide users with the knowledge required to operate the
Nautilus MX3-500RP 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-
500RP, 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.
his manual is written specifically for the Nautilus MX3-500RP portable extractor
units manufactured by:
Hydro-Force
4282 South 590 West
Salt Lake City, U 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
MX3-500RP High Pressure Extractor
Height: 42-1/4”
Length: 34-3/8”
Width: 23-3/8”
Weight: 148 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: Little iant 120VAC 8-20 gpm
Maximum psi 11.4 – Maximum pumping height 26 ft.
Power Draw: Cord #1 – 15.93Amp wide open / 12.23amp full load
Cord #2 – 10.40Amp wide open / 6.70amp full load
(Add 5.00amps 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 Mounting 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
Auto Pump-out System:
Pump-out Hose: 50’ x 3/4” with male & female garden hose fittings
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

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Additional / Optional Equipment
Wand lide – Delrin AW529D
Wand lide – Teflon AW529T
18” Bottom Velcro Strap for Wand Holder NM5841
Hy-Dry Deluxe Upholstery Tool: AW50D
ekko Handle Assembly: AR51A
ekko 4” Tool Head: AR51D
SX-7 Tool Head: AR51
ekko Hand Tool: AR53
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’ FCI Power Cord: NM4407A
Belt Pack AX108
AC10
AX108
AR53
AR51A
AW50
NM4407A
AR51G
AR51

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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 OPERATIN THE MX3-500RP.
•o reduce the risk 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.
•his machine shall be grounded while in use to protect the operator from electric shock. he machine is
provided with a three-conductor cord and a three-contact grounding type attachment plug to fit the
proper grounding type receptacle. he 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.
•his machine is for use on a nominal 120-volt circuit and
has a grounding plug that resembles the plug illustrated in
the sketch to the right. Make 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.
•he 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.
•he two power cords must be plugged into separate circuits during operation. he Dual Circuit Indicator will
ensure that the two cords are operating on different circuits (see Page 9 for details.)
•Do not use the MX3-500RP outdoors, in standing water or on wet surfaces. Do not store the MX3-500RP in
wet conditions. If extractor is leaking, 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 breaker. Reduced voltage to machine on overloaded circuit will
prevent components from operating properly.
Section
1

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WARNIN ! 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. he MX3-500RP, 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 MX3-500RP 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. he machine is filled at the factory with anti-freeze to eliminate damage during
shipment in cold weather.
ohe anti-freeze solution must be completely flushed from the machine before it is returned to service.
•he MX3-500RP must not be used to pick 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 tank, 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 tank daily to keep pump-out filter and pump from becoming
clogged. Store the MX3-500RP with the recovery tank lid open.
•Keep Vacuum Inlet Filter clean and check float for proper operation. Do not operate the MX3-500RP 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 MX3-500RP up or down stairs when tanks are full of water. Drain solution and recovery
tanks, 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 MX3-500RP 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.
oAir flow is usually measured in cubic feet per minute,
indicated as CFM.
oLift 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 Gatekeeper 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 Gatekeeper 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
GA EKEEPER

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Operation Procedures
Knowledge of the proper operation of the MX3-500RP is required to
ensure user safety and efficient performance of the extractor.
SET UP AND OPERATION
1. Electrical Cords:
wo 25’ power cords are supplied with the Nautilus MX3-500RP. he 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.
his machine should be able to run when both cords are connected to separate 15amp circuits. 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 breaker immediately, but may not provide sufficient voltage for proper operation and the breaker will
trip eventually.
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 breaker trips or the pump circuit breaker trips during operation, reset the breakers and move the
cord to another outlet as needed.
Power Cord – AX32
25’ – 12 gauge M-F Plugs
Cord #1
Cord #2
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 tank 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 tank.
he amount of chemical will vary depending on the type of chemical used, the amount of water in the
tank, and the material being cleaned; consult the chemical packaging for specific mixture ratios.
•Powdered chemicals should be dissolved in water before adding to the water in the solution tank.
DO NOT RUN OUT OF WATER WHILE USIN 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:
•he 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 ip” on Page 11 for instructions.)
Chemical Feed Setup:
•Remove the chemical feed hose from the solution tank. Make sure float is attached to valve and hanging
freely, above the bottom of the solution tank. 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.)
•he recommended tip for use with the MX3-500RP is the turquoise tip with a dilution rate of 256:1. his
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 Valve
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 back 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.
•he dilution rates are based on chemicals with water-like viscosity. hicker (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
IP
COLOR
CHEMICAL DILU ION RA ES
OZ / GAL (RA IO)
AN 0.30 (427:1)
ORANGE 0.40 (320:1)
TURQUOISE 0.50 (256:1)
PINK 0.75 (170:1)
LIGH BLUE 1.00 (128:1)
BROWN 1.12 (114:1)
RED 1.50 (85:1)
WHI E 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 IP 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 quick-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 kits (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:
•urn off the water supply.
•Adjust the length of the chain connecting the float bottle to
the float valve. Unhook the float from the beaded chain on
the valve. Unsnap the hook 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 back onto the float chain & hook the float back
onto the valve chain.
•urn the water supply back on.
If the chemical is not drawing, or if the tank 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 quick connect on the front of the
machine). Connect the other end of the hose to the male quick 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 tank, the high pressure pump must be primed:
•here is a prime valve located on the lower back portion of the machine.
•urn on both vacuums and the solution pump. Press the priming lever for a few seconds while you
block off the vacuum inlet with your hand. he vacuum will pull solution through the pump and
prime valve into the vacuum tank.
•Let off the prime valve and your pump is primed. As long as there is solution in the tank 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, check the hose from the solution tank to the
pump (as well as the filter) for clogging, kinks, 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 HE PUMP PRIMING VALVE

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5. Connection of Vacuum Hoses:
he vacuum connection port on the machine can be either a 2” hose barb or 2” male Flash Cuff. Both are
included with your MX3-500RP. he 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 MX3-500RP. he 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
MX3-500RP 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 PRIMIN
VALVE
Vacuum Hose connection with standard barb
and vinyl cuff
Vacuum Hose connection with Flash Cuffs
BLOCKING HE VACUUM POR O PRIME PUMP

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Optional Foam Downer:
A key problem with portable extractors is that they have small tanks 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 makes a big mess, can decrease vacuum lift and damage the vacuum motors.
he Foam Downer kills foam as waste water enters the machine. Place a container of liquid defoamer on the
top of your MX3-500RP. he vacuum air flow siphons the liquid defoamer through Foam Downer into the
vacuum tank, breaking down the foam before it can cause any damage or make 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
he Foam Downer is an attachment that allows the vacuum to draw a small amount of defoamer in a
constant slow flow into the waste tank 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 break
down the foam you can open the valve more or add more defoamer to the water to make a stronger solution.
With the valve open one half turn it will take 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 Pump-Out Hose:
he 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 back 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 uses a float switch and does not start pumping until the water level in the
tank is high enough to lift the float switch. The pump will turn ON & OFF during normal
operation. Pump will be damaged if allowed to run dry.
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 tank
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 tank from overfilling and waste water from getting into the vacuums.
When this occurs:
•Immediately shut off the vacuum switches.
•Drain the recovery tank.
ourn off the pump switch while draining the tank.
ourn pump switch back upon resumption of cleaning.
•Close the drain valve and turn the vacuum switches back on
when ready to resume cleaning.
If the pump-out or vacuum shutoff is not working 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 ank

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7. Pressure Adjustment:
o make it easier to check 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.
•o decrease the pressure, turn the black knob on the pressure regulator/unloader to the left (counter-
clockwise.)
•o increase the pressure, turn the black knob on the pressure regulator/unloader to the right
(clockwise.)
•o adjust pressure to your tool and surface requirements:
oSpray the tool.
oCheck 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.
he 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.
he 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. his will allow
use of the water and chemical already in the tank, 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 tank, 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 quick-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 tank, use the vacuum hose and
vacuum the excess water from the tank.
•If the optional auto-fill system was utilized, place the chemical feed
hose back into the solution tank.
•If the optional Auto waste pump-out system was used:
ourn the waste pump switch “on” & lift the float switch to pump out any remaining water from
the recovery tank.
ourn 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 tank and clean
vacuum shutoff filter as needed.
•Clean Pump-Out Pump and Float Switch.
Replace shutoff assembly and tank lid.
•Drain any remaining water from the recovery tank
and dispose in sanitary drain. Do not use the same
bucket to drain the tank that you use to fill the tank.
•Roll up all hoses and cords.
Collect and store extractor, all tools, and accessories.

19
Accessory Storage Options:
he MX3-500RP is designed to make it easier for the
operator to transport the machine and the most common
cleaning accessories.
Bucket & Sprayer Storage
he top of the MX3-500RP is sized and recessed to hold a
five gallon bucket or two one-gallon chemical bottles as
well as two 2Q sprayers.
Power Cord Storage
he back of the MX3-500RP has two sets of cord wraps
to hold two 12/3 x 25’ power cords.
Carpet Wand Storage
he front of the MX3-500RP 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 MX3-500RP has a set of molded in
threaded inserts to which holders can be attached to hold
other accessories or supplies making it much easier to
move around. Four 1/4-20 x 5/8” mounting screws &
washers included
Molded in hreaded Inserts
for Side Mount Holders
Wand Holder Straps

20
Troubleshooting –
Nautilus MX3-500RP
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 34
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