Nautilus HYDRO-FORCE MX500HE User manual

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#LMANN13 Revised: 02-16-2018
Nautilus MX500HE
Operating Manual

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Nautilus MX500HE Operating Manual
TABLE OF CONTENTS
TOPIC PAGE #
•Intr ducti n 3
•Technical Specificati ns 4
•Opti nal Equipment 5
SECTION 1: Operati nal Safety
•Electrical Safety 6
•Mechanical Safety 7
SECTION 2: Operati n Pr cedures
•Vacuum C nnecti ns 8
•Electrical Supply 9
•Water Supply & Chemicals 10
•S luti n H se & Pump Priming 13
•Heater & Vacuum H se 14
•F am D wner 15
•Pump-Out System 16
•Pressure Adjustments 17
•Shutd wn Pr cedures 18
•Access ry St rage 19
•Tr ublesh ting 20
•S luti n Fl w Path 23
•Wiring Diagrams 24
SECTION 3: Maintenance/ Technical
•Maintenance 27
•Drawings & Parts Lists
oPump 36
oPressure Regulat r 37
oAut -Fill 38
oPump-Out Pump 40
oParts Pictures 41
oParts List 53
oH se List 56
•Warranty 57

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Introduction
Congratulations on your purchase of the Hydro-Force Nautilus MX500HE. The
MX500HE 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
MX500HE. We ta e a great deal of pride in the MX500HE; our goal is no less
than your complete satisfaction.
This manual will provide users with the nowledge required to operate the
Nautilus MX500HE 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 c mpletely bef re
perating the machine.
Always maintain this manual in legible condition adjacent to the Nautilus
MX500HE, 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 MX500HE 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
MX500HE High Pressure Extract r
Height: 42-1/4” (107.32cm)
Length: 34-3/8” (87.31cm)
Width: 23-3/8” (59.37cm)
Weight: 143 lbs. (64.86kg)
S luti n Tank Capacity: 12 gall n (45.4 Liters)
Rec very Tank Capacity: 12 gall n (45.4 Liters)
S luti n Pump: Pump-Tec #207 pump with 1/2 HP M t r - 0-500 psi
1.06 gpm / 4.01lpm
220V 50Hz – 3.4amps / 230V 60Hz – 2.8amps
Vacuum M t rs: Tw AMETEK Lamb 5.7” diameter 2-Stage – tangential discharge
Can be perated in series r parallel c nfigurati n
Pump- ut Pump: Fl Jet 230VAC 5.0 gpm (0.75amp)
(Opti nal)
P wer Draw: C rd #1 – 6.63Amp wide pen / 4.63amp full l ad
(Add 0.75amps t C rd #1 f r units with pti nal Pump-Out Pump)
C rd #2 – 11.35Amp wide pen / 10.75amp full l ad
Standard Equipment
Vacuum C nnecti n: 2” Barb r 2”Male Flash Cuff with 2” Male NPT
Vacuum H se: 25’ X 1-1/2” with 1-1/2” cuff & 2” cuff
2” Female Flash Cuff x 1-1/2” h se adapter
Carpet Wand: 1-1/2” SS Dual Jet S-Bend Wand – AW29
Access ry M unting Hardware: F ur 1/4-20 x 5/8” SS Screws & Washers
HP S luti n H se: 25’ x 1/4” with 1/4” male & female quick c nnects
Pump Priming H se: 12” x 1/4” with 1/4” male quick c nnect
P wer C rds: 2 – 15M Extensi n Leads with male & female plug ends
Electrical: 1750W Heater
5amp Pump Circuit Breaker
Internal C mp nent C ling Fan
Opti nal Features:
Aut Fill System with chemical draw:
Metering Tip Kit: 14 different tips f r changing chemical diluti n rate
Water Supply H se: 50’ x 3/8” with 1/4” female quick c nnect &
Female garden h se fitting
Aut Pump- ut System:
Pump- ut H se: 50’ x 3/4” with male & female garden h se fittings

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Additi nal / Opti nal Equipment
Wand Glide – Delrin AW529D
Wand Glide – Tefl n AW529T
18” B tt m Velcr Strap f r Wand H lder NM5841
Hy-Dry Deluxe Uph lstery T l: AW50D
Flash Xtract r II: AC002
Gekk Handle Assembly: AR51A
Gekk 4” T l Head: AR51D
SX-7 T l Head: AR51G
Gekk Hand T l: AR53
1-1/2” Vacuum H se: (S ld per f t – N cuffs) AH36
2” cuff f r 1-1/2” Vac H se: AH46
1-1/2” cuff f r 1-1/2” Vac H se: AH42
1-1/2” H se C nnect r PVC: AH74
HP S luti n H se 1/4” X 25’ w/M-F Quick C nnects AH79D
1/4” Male Quick C nnect: AH102B
1/4” Female Quick C nnect: AH101B
Pump- ut H se: AH65
Hydr Filter II: AC10
Replacement Screen f r Hydr -Filter II: AC10C
Metering Tip Kit: PDE001
Belt Pack AX108
AC10
AX108
AR51A
AW50
AR51G
AR51
AR53
AC002

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Safety
This machine is an electrical appliance.
Care must be taken t reduce the risk f electrical sh ck.
READ AND UNDERSTAND ALL INSTRUCTIONS BEFORE OPERATING THE MX500HE.
•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 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 240-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 with
an equal or greater load rating and grounded to assure
safe operation.
•The two power cords must be plugged into separate circuits during operation.
•Do not use the MX-500HE outdoors, in standing water or on wet surfaces. Do not store the MX-500HE 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 a machine on an overloaded circuit
will prevent components from operating properly.
Section
1
OUTLET

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This machine must be pr tected fr m c nditi ns which
may damage the pump, tank, h ses and ther c mp nents.
•Freezing f water in this machine will cause seri us damage. The Nautilus MX-500HE, 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 Nautilus MX-500HE 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 MX-500HE 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 or 54ºC.
•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 Nautilus MX-500HE with the recovery tan lid open.
•Keep Vacuum Inlet Filter clean and chec float for proper operation. Do not operate the Nautilus MX-500HE
without the Vacuum Inlet Filter in place. Use def amer t eliminate f am build-up during cleaning and
prevent f am/m isture fr m entering vacuums.
Use c mm n sense t pr tect y urself and thers 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
wor 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 MX500HE 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 machine handles designed &
designated for moving and lifting.
•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 MX500HE has a unique vacuum system which all ws y u t
c nnect y ur vacuums in either parallel r in series. Vacuum
c nnecti ns can be changed quickly, with nly a screw driver.
∗THIS MUST BE PERFORMED BY A QUALIFIED
TECHNICIAN
While there is debate n which vacuum alignment pr vides the best
extracti n, this much is true:
•Tw vacuums in series: The vacuum lift is increased by 1.6 times
the rating f a single vacuum, while the air fl w stays the same as
a single vacuum.
•Tw vacuums in parallel: The vacuum air fl w is increased by 2.0
times the rating f a single vacuum, while the lift says the same.
Air fl w is usually measured in cubic feet per minute, indicated as
CFM.
Lift is usually measured in inches f water c lumn, indicated as “H2O
r “WC.
T c nnect 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.
T c nnect 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.
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
Kn wledge f the pr per perati n f the MX500HE is required t
ensure user safety and efficient perf rmance f the extract r.
SET UP AND OPERATION
1. Electrical C rds:
Two 15m extension cords are supplied with the Nautilus MX500HE. The amperage required by each cord
requires that the two cords be plugged into separate circuits:
•Cord #1 (Left side) Powers vacuum #1, vacuum #2, cooling fan and the optional waste pump if so
equipped.
•Cord #2 (Right side) Powers solution pump and the 1750W heater.
An overloaded circuit will not always trip the circuit brea er immediately, but may not provide sufficient
voltage for proper operation and the brea er may trip eventually.
Plug the two power cords into two outlets from different circuits. Proceed with your set-up procedure.
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.
When perating the MX500HE with the 1750W heater DO
NOT turn the heater n until after the pump has been primed and s luti n h se and
t l c nnected
Cord #1 Cord #2
EXTENSION CORD:
#CSRCE1515
15M’ – 1.5M2 3-GAUGE
M-F PLUGS

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2A. Water Supply & Chemical Mixing– Manual Fill:
•Pour up to 12 gallons (45.4 liters) of hot water into the solution tan at the front of the machine. The
water temperature cann t exceed 130°
°°
°F r 54°C.
•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 c ntains en ugh water t c mplete each j b. If the water level is l w: st p cleaning,
turn ff the pump, and refill the tank. Running the pump dry will damage the pump and v id the
warranty.
2B. Opti nal Aut -Fill System - Water Supply & Chemical Diluti n:
•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. (125 ml per liter of water)
•The recommended tip for use with the MX500HE 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.
(3.91ml of chemical per liter of water)
•If a fresh water rinse with n chemical is desired, simply leave the chemical feed h se inside the
s luti n tank.
Proportioning V
alve
Chemical Feed Hose
Float Hanger
Float Valve
Pour appropriate amount of hot water into
solution tank
Add appropriate amount of chemical to water
in solution tank
Float

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H w t 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 (Hydr -F rce 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. (11.77ml of chemical per liter of water)
•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 Applicati n Chart:
Metering Tip Kit – PDE001
Turquoise Tip
Dilution 256 - 1
Red Tip
Dilution 85 - 1
TIP
COLOR
CHEMICAL DILUTION
RATES
OZ / GAL (RATIO)
RATES
ml / liter
TAN 0.30 (427:1) 2.34
ORANGE 0.40 (320:1) 3.13
TURQUOISE 0.50 (256:1) 3.91
PINK 0.75 (170:1) 5.88
LIGHT BLUE 1.00 (128:1) 7.81
BROWN 1.12 (114:1) 8.77
RED 1.50 (85:1) 11.77
WHITE 1.75 (73:1) 13.70
GREEN 2.00 (64:1) 15.63
BLUE 2.50 (51:1) 19.60
YELLOW 3.75 (34:1) 29.41
BLACK 5.00 (26:1) 38.46
PURPLE 8.50 (15:1) 66.67
GRAY 11.50 (11:1) 90.90
NO TIP 16.25 (8:1) 125.00
Proportioning Valve
Chemical Feed Hose

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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 130°F or 54°C.
•Faucet adapter its (Hydro-Force item #AX21 & AX22) are available that allow connection to different
types of faucets if needed.
T adjust the water level in the s luti n 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. Priming the High-Pressure Pump:
Once water is in the solution tan , the high pressure pump must be primed:
•There is a priming hose included with the machine. Connect the priming hose to the solution outlet –
female quic connect on the front of the machine.
•Turn on both vacuums and the solution pump. Insert the end of the priming hose into the vacuum
inlet port on the front of the machine and cup your hand around the hose to bloc off the vacuum
inlet with your hand. The vacuum will pull solution through the pump and priming hose into the
vacuum tan .
•Turn off the pump and then the vacuums. Disconnect the priming hose. You can now continue your
set-up. As long as there is solution in the tan , the pump should remain primed.
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.
4. C nnecti n f S luti n H se:
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. The pressure is preset; there is no
pressure adjustment to be made.
PUMP PRIMING HOSE
NM5080
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

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5. 1750W Heater Operati n:
T prevent damage t the heater, the heater must have water in it bef re it is
turned ON.
Fill s luti n tank, prime the pump and c nnect s luti n h ses bef re turning heater ON.
While the heater allows for maximum operating temperature of approximately 190ºF or 88°C, the
temperature of the cleaning water delivered to the tool is dependent on two factors:
•The starting temperature of the water: Starting with hotter water will require a smaller temperature
increase from the heater to reach the maximum temperature.
The water temperature in the s luti n tank cann t exceed 130°
°°
°F r 54°C.
•Flow rate: The lower the flow rate of the water through the heater, the more time the water will be inside
the heater. The water will have more time to be heated and can reach a higher temperature. High water
usage and flow rate will not allow the water enough time to be heated and the temperature of the water
delivered to the tool will be much lower.
The flow rate can be lowered by putting smaller jets in the cleaning tool and by reducing the amount of
time the wand is sprayed. Ta ing additional drying sto es without spraying water between spraying
stro es will help increase the potential temperature rise.
6. C nnecti n f Vacuum H ses:
The vacuum connection port on the machine can be either
a 2” hose barb or 2” male Flash Cuff. Both are included
with your MX500HE. 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 MX500HE. 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 MX500HE
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.
Vacuum connection with standard barb and
vinyl cuff
Vacuum connection with Flash Cuffs

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7. Opti nal F am D wner:
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 use 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 MX500HE. 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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8. C nnecti n f Opti nal Pump-Out H se:
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 def amer t prevent f am build-up in rec very tank during cleaning and t keep
f am/m isture fr m entering vacuums.
Use Hydr Filter II inline filter t trap and rem ve debris fr m the waste water bef re it
enters the rec very tank. Excess debris in rec very tank may cl g Pump-Out filter. Clean
Filter as needed during use.
D n t turn the Waste Pump switch ON unless pump- ut h se is c nnected and has been
r uted t a pr per drain.
The Waste Pump d es n t use a fl at switch and will run as s n as the Waste Pump switch
is turned ON. It is made t run c ntinu usly while cleaning, as this type diaphragm pump
can run dry with ut 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

17
9. Pressure Adjustment:
To ma e it easier to chec and adjust the pressure, the pressure gauge and the pressure regulator 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.
•To decrease the pressure, turn the brass nob on the pressure regulator to the left (counter-
cloc wise.)
•To increase the pressure, turn the brass nob on the pressure regulator to the right (cloc wise.)
•To adjust pressure to your tool and surface requirements:
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 knob clockwise.
To decrease the solution pressure, turn the
regulator 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
Shutd wn Pr cedures:
•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.
•If using the 1750W heater, turn the heater off before finishing each job. This will allow the water to cool
the heater as you finish the job.
•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
Access ry St rage Opti ns:
The MX500HE is designed to ma e it easier for the
operator to transport the machine and the most common
cleaning accessories.
Bucket & Sprayer St rage
The top of the MX500HE is sized and recessed to hold a
five gallon buc et or two one-gallon chemical bottles as
well as two 2QT sprayers.
P wer C rd St rage
The bac of the MX500HE has two sets of cord wraps to
hold two 12/3 x 25’ power cords.
Carpet Wand St rage
The front of the MX500HE is designed to hold a S-Bend
Carpet wand and has two straps to hold it securely.
Optional strap for larger wands available
Other T l & H se St rage
Each side of the MX500HE 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 MX500HE
Problem
Cause
Solution
Machine not Building circuit breaker tripped. Reset breakers or move cords to other outlets
turning on - Faulty power cord Replace cord
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
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
and/or Jets worn allowing too much flow Replace jets
Pulsation Solution inlet filter plugged Clean or replace filter
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 piston – PAGE 34
Pressure regulator faulty Repair or replace pressure regulator (PT021)
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
Prime Valve Stuck Open Repair or replace Prime Valve
Pump faulty Repair or replace pump (PT065 or AP52)
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