Onyx LX700 User manual

This Guide provides necessary instructions on machine operation and
maintenance. Before operation or use of this machine, please carefully
read and understand this Guide.
OPERATOR MANUAL
ONYX PROPANE ENGINE LX700
19HP 708cc PROPANE ENGINE

Website: https://www.onyxsolutions.store/
No further notice will be given for possible change of specication and parts.
Machine Information:
Please ll in when installing for future reference.
Model number: _____________________________________________________________________
Machine serial number: ____________________________________________________________
Sales representative: _______________________________________________________________
PO number: _________________________________________________________________________
Date PO placed: _____________________________________________________________________
Installation Date: ____________________________________________________________________
12605 Commerce Station Drive • Suite 700
Huntersville, NC 28078
704.827.9368
19HP 708cc PROPANE ENGINE

TABLE OF CONTENTS
Parts Ordering
Warranty Claims
Technical Support
Protect the Environment
Genral Information
Safety Symbols
General Safety Standards
Components and Controls
Engine Specications
Engine Dimensions
What You Need To Know
Standards of Use
Maintenance
Troubleshooting
Wiring Diagram
Notes
4
4
4
4
5
5
5-6
7
8
9
10-11
11-13
14-16
17
18
19

4
PARTS ORDERING
When ordering the replacement parts, please refer to the ONYX website at www.onyxsolutions.com. Use
of the published Illustrated Parts Lists (IPL’s) to identify the correct part number required is required to
support accuracy of parts ordering.
Machine IPL’s can be found at the top of the SHOP page of the ONYX website. Before matching parts
or accessories, please rstly determine your machine model and serial number. You can order parts and
accessories from any authorized service center or dealer by telephone at 704-827-9368, or email us at
[e-mail].
WARRANTY CLAIMS
ONYX Warranty Statement (policy) and Warranty Claim form can be found on the SUPPORT page of the
ONYX website, https://www.onyxsolutions.store/support.
TECHNICAL SUPPORT
Technical support is available by submitting a HELP TICKET on the CONTACT US page of the ONYX website,
https://onyxsolutions.odoo.com/contact.
PROTECT THE ENVIRONMENT
Please abandon the old machine components such as packaging material, battery,
etc. and toxic liquid such as anti-freezing agent and oil according to your local
regulations on waste disposal and on the premise of maintaining environmental
safety. Please ensure to carry out the recycling well.
12605 Commerce Station Drive • Suite 700
Huntersville, NC 28078
704.827.9368

5
GENERAL INFORMATION
READING AND UNDERSTANDING THE MANUAL
Your engine should be used with due care and attention. Symbols have therefore been placed on the
engine to remind you of the main precautions to be taken. Their full meaning is explained later on. You
are also asked to carefully read the safety regulations in the applicable chapter of this handbook.
Some paragraphs in the manual containing information of particular importance for safety and operation
are highlighted at various levels of emphasis, and signify the following:
SAFETY SYMBOLS
NOTE: or IMPORTANT:
These give details or further information on what has already been said, and aim to prevent damage
either to the engine or other damages.
WARNING: Non-observance will result in the risk of injury to oneself or others.
DANGER: Non-observance will result in the risk of injury to oneself or others.
NOTE: All indications, “front”, “rear”, “right” and “left”, are to be taken as referring to the engine positioned
with the spark plug facing forwards with respect to the observer.
WARNING: Read and follow Operating Instructions before running engine.
WARNING: Propane is ammable. Allow engine to cool at least 2 minutes before refuelling.
WARNING: Engines emit carbon monoxide. DO NOT run in enclosed area.
GENERAL SAFETY STANDARDS
TRAINING:
1) Carefully read the instructions contained in this manual and the instructions of the machine on
which this engine is installed. Learn how to stop the engine quickly.
2) Never allow people unfamiliar with these instructions to use the engine.
3) Never use the engine while people, especially children, or pets are nearby.
4) Remember that the operator or user is responsible for accidents or hazards occurring to other
people or their property.

6
GENERAL SAFETY STANDARDS
PREPERATION:
1) Do not wear loose-tting clothing, dangling drawstrings, jewels or items that could become caught;
tie up long hair and keep at safe distance while starting the lawnmower.
2) Turn engine OFF and let it cool before removing gas cap.
3) WARNING: DANGER! Fuel is highly ammable:
– store the fuel in special containers;
– refuel only outdoors by using a funnel;
never smoke while refueling and/or handling fuel;
– add fuel before starting the engine. Never remove the cap of the fuel tank or add fuel while the engine
is running or when the engine is hot;
– if you have split some fuel, do not attempt to start the engine but move the machine away from the
area of spillage and avoid creating any source of ignition until the fuel has evaporated and fuel vapours
have dissipated.
– always put the tank and fuel container caps
back on and tighten well.
4) Replace faulty silencers and the guard, if damaged.
OPERATION:
1) Do not operate the engine in a conned space where dangerous carbon monoxide fumes can collect.
2) Do not use starting uids or similar products.
3) Do not change the engine governor settings or overspeed the engine.
4) Do not tilt the machine onto its side to prevent fuel leaks from the fuel tank cap.
5) Do not touch the cylinder ns and/or the silencer guard until the engine has cooled down.
6) Stop the engine and disconnect the spark plug cable before checking, cleaning or servicing the machine
or the engine.
7) Do not crank the engine with spark plug removed.
8) Transport the machine with empty tank.
MAINTENANCE AND STORAGE:
1) A routine maintenance is essential for safety and for keeping a high performance level.
2) Do not store the machine with fuel in the tank in an area where the fuel vapours could reach an open
ame, a spark or a strong heat source.
3) Allow the engine to cool before storing in any enclosure.
4) To reduce the re hazard, keep the engine, the silencer and the fuel storage area free of grass, leaves, or
excessive grease.
5) If the fuel tank has to be drained, this should be done outdoors once the engine has cooled down.
6)On safety ground, never use the engine with either worn or damaged parts. Parts are to be replaced and
not repaired. Use genuine spare parts. Parts that are not of the same quality can damage the engine and
impair your safety.

7
COMPONENTS AND CONTROLS
ENGINE COMPONENTS:
1. Oil llercap with dipstick
2. Oil drain plug
3. Air cleaner cover
4. Fuel stopcock
5. Spark plug cap
6. Engine code
ENGINE COMPONENTS:
The throttle trigger (generally a lever), tted to the machine, is connected to the engine by a cable.
Consult the machine’s Instructions Manual to identify the throttle trigger and its positions, usually
marked by symbols, corresponding to:
CHOKE: To be used for starting from cold.
FAST: Corresponds to maximum revs; to be used when working.
SLOW: Corresponds to minimum revs.

8
LX700 19HP PROPANE ENGINE
ONYX LX700 engines operate on clean burning propane fuel signicantly reducing emissions while increasing
safety and reliability.
CLEANEST EMISSIONS IN CLASS
LEHR Propane Fuel Systems on the LX700 are certied 53% cleaner emissions than the closest engine in its class
according to the Environmental Protection Agency. Standard low tone catalytic muers reduce carbon monoxide
emissions well below OSHA permissible exposure limits. SAM Safe Air Monitor further increases safety by
alerting operators should carbon monoxide levels climb to unsafe levels and will automatically shut engines down
to prevent injury.
RELIABILITY
DESIGNED FOR PROPANE DURABILITY
LEHR Propane Fuel Systems use a patented variable venturi and fuel jet design which never comes out of
calibration and requires no eld adjustments. LEHR systems utilize a threestage pressure regulator that
vaporizes any liquid propane caused by overlled cylinders or use of liquid cylinders making the LX700 the
safest and most reliable engine in its class.
Heavy-duty piston rings, a cast iron cylinder liner, and hardened heads designed for propane fuel resist wear and
ensure precise timing for long engine life in commercial and industrial applications. Our heavy duty, low tone
catalytic muer is supported back to the engine block with two brackets and lasts the life of the engine.
Type:
Power:
Size:
Bore x Stroke:
Fuel System:
Fuel Type:
Starter:
Oil Capacity:
Dry Weight:
Air Cleaner:
Muer:
Cylinder:
Crankshaft:
Air-cooled, V-Twin OHV
19hp (14.0 kW)
708cc Vertical Shaft
77mm x 76mm
Fixed Venturi & Jet with
Buttery Throttle
Vapor Propane
Electric 12v
2.4 Liters
93lbs.
Canister, Top Mount
Low Tone Catalytic
V-Twin, Hardened
1” Keyed PTO
SPECIFICATIONS POWER CURVE
14
16
18
20
22
24
26
28
30
32
34
36
2600
2800
3000
3200
3400
360
3800
4000
Engine Speed, RPM
Gross Power, HP

9
LX700 19HP PROPANE ENGINE
DIMENSIONS (mm)
430.95
17.0
206.83
8.1
454.50
17.9
553.48
21.8
9.49
.4
76.20
3.0
6.35
.3
80.50
3.2
115.69
4.6
25.40
1.0
374.47
14.7
291
11.5
225.16
8.9
487.96
19.2
7/16-20 UNF
1.65" Depth
254
10.0
498.37
19.6
185.43
7.3
165.68
6.5
268.57
10.6
266.34
10.5
100.77
4.0
132.35
5.2
45° 45°
35°
35°
254
10.0
3/8"-1/16 UNC
(TYP 4 PLCS)

10
WHAT YOU NEED TO KNOW
The engine performance, reliability and life are inuenced by many factors, some external and some
strictly associated with the quality of the products used and with the scheduled maintenance.
The following information allow a better understanding and use of your engine.
ENVIRONMENTAL CONDITIONS:
The operation of a four-stroke endothermic engine is aected by:
a) Temperature:
– Working in low temperatures could lead to a dicult cold starting.
– Working in very high temperatures could lead to a dicult hot starting due to the evaporation
of the fuel either in the carburetor oat chamber or in the pump.
– In any case, the right kind of oil must be used, according to the operating temperatures.
b) Altitude:
– The higher the altitude (above sea level), the lower the max power developed by an endothermic
engine.
– When there is a considerable increase in altitude, the load on the machine should be reduced and
particularly heavy work avoided.
OIL:
Use always high quality oils, choosing their viscosity grade according to the operating temperature.
a) Use only detergent oil classied SJ,SL or higher are acceptable.
b) Choose the SAE viscosity grade of oil from this chart:
– from 5 to 35 °C = SAE 30
– from -25 to + 5 °C = 5W-20 or 5W-30 (Multi-viscosity)
– from -7 to + 35 °C = Synthetic oils 10W-30 or 15W-40 (Multi-viscosity)
c) The use of multi-viscosity oils in hot temperatures will result in higher than normal oil consumption;
therefore, check oil level more frequently.
d) Do not mix oils of dierent brands and features.
e) SAE 30 oil, if used below 5°C, could result in possible engine damage due to inadequate lubrication.
f) Oil should be at “MAX” mark do not overll. Overlling with oil may cause:
– Smoking;
– Spark plug or air lter fouling, which will cause hard starting.
AIR FILTER:
A good quality fuel is the major issue for the engine reliability of operation. The air lter must always
be in perfect working order, to prevent debris and dust from getting sucked into the engine, reducing
the eciency and life of the machine.
a) Always keep the ltering element free of debris and in perfect working order.
b) If necessary, replace the ltering element with an original spare part. Incompatible ltering ele-
ments can impair the eciency and life of the engine.
c) Never start the engine without mounting the ltering element properly.

11
WHAT YOU NEED TO KNOW
SPARK PLUG:
Not all the spark plugs for endothermic engines are the same!
a) Use only spark plugs of the recommended type, with the right heat range.
b) Check the length of the thread, because – if too long – it will damage the engine beyond repair.
c) Make sure that the electrodes are clean and their gap is correct.
STANDARDS OF USE
BEFORE EVERY USE:
Before every use, perform the following checking procedures in order to assurea regular operation.
CHECK THE OIL LEVEL:
See the specic chapter for the oil to be used.
a) Place the engine level.
b) Clean around oil ll.
c) Unscrew the cap, clean the end of the dipstick and insert it, as illustrated, without screwing it down.
d) Remove the cap with the dipstick and check the oil level that must be between “MIN” and “MAX”
marks.
e) If oil is required, add oil of the same kind up to the “MAX” mark, being careful not to spill any outside
the oil ll.
f) Fully tighten the llercap and wipe o any spilled oil.
CHECK THE AIR CLEANER:
The eciency of the air lter is fundamental for the engine to work properly. Do not start the engine if
the ltering element is missing or broken.
a) Clean around the lter cover.
b) Open the clips of the two sides of the air lter cover.
c) Check the condition of the ltering element. It must be intact, clean and in pefect working order; if
not, either carry out maintenance or replace it.
d) Put the cover back.
SPARK PLUG CAP:
Firmly connect the cable cap to the spark plug, making sure that there are not traces of dirt inside the
cap and on the spark plug terminal.

12
STANDARDS OF USE
STARTING THE ENGINE (HOT STARTING):
Follow the whole cold-starting procedure with the throttle control in “FAST” position.
USE OF ENGINE IN OPERATION:
Maximum revs must be used to optimize the engine’s yield and performace, by setting the throttle trigger
to “FAST”.
WARNING: Keep your hands away from the silencer and surrounding areas that can become
extremely hot. With the engine running, do not get loose-tting clothing (ties, scarves, etc.)
or hair closer to the top part of the engine.
IMPORTANT: Do not operate on over 20° inclines to prevent malfunctioning of the engine.
STOPPING THE ENGINE DURING MOWING:
a) Move the throttle to “SLOW”.
b) Allow the engine to run at minimum speed for at least 15-20 seconds.
c) Stop the engine following the instructions contained in the machine’s Instructions manual.
STOPPING THE ENGINE AFTER MOWING:
a) Move the throttle to “SLOW”.
b) Allow the engine to run at minimum speed for at least 15-20 seconds.
c) Stop the engine following the instructions contained in the machine’s Instructions manual.
d) When the engine is cold, disconnect the spark plug and remove the starter key (if present).
e) Close the fuel stopcock.
f) Remove any debris from the engine and especially around the exhaust silencer to reduce the risk of re.
CLEANING AND STORAGE:
a) Do not spray with water or use hydraulic lances to clean the exterior of the engine.
b) Use a compressed air gun (max. 6 bars) for preference, thus preventing debris and dust
from penetrating inside.
c) Store the lawnmower (and the engine) in a dry place, sheltered from severe weather conditions and
suciently ventilated.
STARTING THE ENGINE (COLD):
The engine must be started in the way describing in the machine’s instruction manual, always making sure
that any device (if present) that could cause the machine to advance or engine to stop is disengaged.
a) Open the fuel stopcock.
b) Move the throttle to “CHOKE”.
c) Turn the starter key as described in the machine’s instruction manual.
After a few seconds, slowly move the throttle from “CHOKE” to either “FAST” or “SLOW”.
NOTE: If the engine starts but does not keep running, repeat the above steps with the throttle on “FAST”.

13
STANDARDS OF USE
LONG STORAGE (OVER 30 DAYS):
In case the engine has to be stored for a long time (for example at the end of the season), a few precautions
are needed to help the future start-up.
a) To prevent the formation of deposits inside the tank, empty it of fuel by unscrewing the carburettor
oat chamber plug and collecting all the fuel in a suitable container. At the end of the operation remember
to screw the plug back on and fully tighten it.
b) Remove the spark plug and pour about 3 cl of clean engine oil into the spark plug hole, then, having
blocked the hole with a rag, run the starter motor briey to turn the engine for a few revs and distribute the
oil over the inner surface of the cylinder. Finally replace the spark plug without connecting the cable cap.

14
MAINTENANCE
WARNING: Remove the spark plug cap and read instructions before carrying out any cleaning,
replair, or maintenance operation. Wear proper clothing and working gloves whenever your
hands are at risk. Do not perform maintenance or repair operation without the necessary
tools and technical knowledge.
IMPORTANT: Never get rid of used oil, fuel or other pollutants in unauthorized places.
MAINTENANCE SCHEDULE:
Follow the hourly or calendar - whichever occurs rst - maintenance schedule shown in the following table.
Operation After
First 5
hours
Every 5
hours or
Daily
Every 50
hours or
every
season
Every
100
hours
Every
200
hours
Every
500
hours
Check oil level
Check or clean air
inlet screen2
Change oil 1
Clean silencer
and engine
Air lter clearing2 and check
Change oil lter
Check spark plug
Replace spark plug
Fuel lter check3
Replace air cleaner
primary element2
Replace air cleaner
secondary element2
1) Change oil every 25 hours if the engine is operating under heavy load or in hot weather.
2 ) Clean air lter more frequently if the machine is operating in dusty areas.
3) To be carried out by a specialized center.

15
MAINTENANCE
CHANGE OIL:
See sepcic chapter for the oil to be used.
WARNING: Drain oil while the engine is warm, being careful not to touch the hot engine nor
the drained oil.
a) Place the machine on a at surface.
b) Clean the area around the ller cap and unscrew the cap with dipstick.
c) Provide a suitable container for collecting the oil and unscrew the drain plug.
d) Ret the drain plug and fully tighten it having made sure that the gasket is in the right position.
e) Fill up with fresh oil.
f) Check that the oil level has reached the “MAX” notch on the dipstick.
g) Close the cap again and clean up any traces of oil that was possibly spilt.
NOTE: The oil capacity is about 2.0 Liter
WARNING: The length of time that Propane can be left in your fuel tank and carburetor with-
out causing functional problems will vary with such factors as Propane blend, your storage
temeratures, and whether the fuel tank is partially or completely lled. The air in a partially
lled fuel tank promotes fuel deterioration. Very warm storage temperatures accelerate fuel
deterioration. Propane will oxidize and deteriorate in storage. Deteriorated Propane will
cause hard starting, and it leaves gum deposits that clog the fuel system. As a result, if the
engine is not used for more than one month, the fuel oil shall be drained thoroughly to prevent
from deterioration of the fuel in the fuel system and carburetor. The failure of the fuel system
or engine performance arising from improper storage are beyond the scope of the warranty.
CLEAN SILENCER AND ENGINE:
Silencer must be cleaned when the engine is cold.
a) Use a jet of compressed air to remove any debris and dirt that could cause a re from the silencer and its
protective cover.
b) Make sure that the cooling air intakes are not blocked.
c) Clean the plastic components with a sponge soaked in water and detergent.
AIR FILTER MAINTENANCE:
a) Clean debris in the air lter cap and rain cover.
b) Open the clips on the two sides of air lter cover.
c) Gently shake element up and down, take out air cleaner primary element and secondary element.
d) Tap the cartridge on a solid surface and blow it from the inside with compressed air to remove dust and
debris.
IMPORTANT: Do not use water, petrol, detergents or any other products to clean the cartridge.
e) Clean the inside of the lter housing, making sure to block the inlet duct with a rag to prevent dust and
debris from entering the engine.
f) Remove the rag blocking the air inlet duct. Reinstall the primary and secondary air lter elements.
g) Reinstall the air lter cover and secure it to the lter housing with the holding clips.

16
MAINTENANCE
SPARK PLUG SERVICE:
a) Remove the spark plug using a spark plug socket wrench.
b) Clean the electrodes with a metal brush and remove any carbonaceous build-up.
c) Using a thickness gauge, check for the right gap (0.6-0.8mm) between the electrodes.
d) Install the spark plug and tighten with a socket wrench.
Replace the spark plug if the electrodes are burnt or if the porcelain is broken or damaged.
WARNING: Fire hazard! Do not check the ignition system with spark plug removed.
IMPORTANT: Use only spark plugs of the recommended type.
TUNING THE THROTTLE CABLE AND THE CARBURETOR:
Should the engine not reach maximum revs with the throttle trigger set to “FAST”, it could be due to the
throttle trigger and speed control lever being out of phase or to a carburetion problem. Go to a specialised
center or contact your dealer to restore normal operation.

17
TROUBLESHOOTING
Hard starting
No fuel
Stale fuel or build-ups in tank
Incorrect starting procedure
Spark plug disconnected
Check and refuel
Empty fuel tank and rell with fresh fuel
Perform the starting procedure correctly
Problem Reason Solution
Dirty electrodes or incorrect gap
The spark plug cap is inserted incorrectly
Air lter clogged
Throttle trigger in “CHOKE” position
Fault in carburation
Fault in ignition
Check
Check that the cap is tted correctly
Check and Clean
Move the lever to the “FAST” position
Contact a Licensed Service Center
Contact a Licensed Service Center
Inconsistent
working
Check that the spark plug cap ts
well over the plug terminals
The spark plug is wet or the spark plug electrodes are
dirty or placed inadequately
Check
Air lter clogged
Incorrect oil for the season
Check and clean
Replace with proper oil
Fuel evaporation in the carburetor
(vapor lock) due to high temperatures
Wait for a few minutes then start
again
Fault in carburation
Hard starting
Contact a Licensed Service Center
Contact a Licensed Service Center
Air lter clogged
Fault in carburation
Governor out of phase with respect to the accelerator
Check and clean
Contact a Licensed Service Center
Adjust the cable
Loss of power
whilst operating
REFILLLING AND OPERATION MATERIALS:
Fuel
Engine Oil: From 5° to 35° C
From -25° to 5° C
From -7° to 35° C
Oil Capacity
Spark Plug
Spark Plug gap
Propane
SAE 30
5W-20 or 5W30
Synthetic 10W-30 or 15W-40
2.0 Liter
F7TRC (NHSP) or equivalent
0.6-0.8mm

18
9
WIRING DIAGRAM/SCHEMATIC
Link to Wiring Schematic PDF le on ONYX Website Support Page:
https://www.onyxsolutions.store/support

19
NOTES

monyxsolutions.co