Lumag GF450 User manual

Distribution Limited
Petrol Trencher
Operator’s Manual
GF450
FOR YOUR SAFETY
READ AND UNDERSTAND THE ENTIRE MANUAL
BEFORE OPERATING THIS MACHINE

Warranty Registration Form
For the warranty to be valid the Warranty Registration Form must be completed and
returned to Lumag Distribution Limited within 14 days of the purchase, together
with a copy of the purchase invoice.
We will use your email to confirm that we have received the completed Warranty
Registration Form and contact you about any errors or omissions on the form. We
may occasionally use this email address to make you aware of news, technical advice
and special offers. If you do not wish to receive such emails please tick this box.
Unit 10, Hatchmoor Industrial Estate, Hatherleigh, Okehampton, Devon EX20 3LP
www.lumag-gb.co.uk 01837 811741
Lumag Distribution Limited Company Number: 09267547 VAT Number: GB154566788 Hatherleigh
Plant and Tool Hire is a trading name of Lumag Distribution LTD
Model:
Serial Number:
Type of Use: Business / Domesc
Name:
Business Name:
Address:
Email Address:
Phone Number:
Date of Purchase:
Place of Purchase:
Proof of Purchase
enclosed:

Lumag Servicing and
Maintenance Schedules
Engine Service & Maintenance Schedule
Machine Service & Maintenance Schedule
Item Checks/Work Each Use 20hrs
(1st Month)
50hrs
(2nd Month)
100hrs
(6th Month)
300hrs
(Yearly)
Engine Oil Check Level X
Change X (1) X
Air Filter Check X
Clean X (3)
Replace X (4)
Sediment Cup Clean X
Spark Plug Check/Clean X
Replace X
Idle Speed Check/Adjust X (2)
Valve Clearance Check/Adjust X (2)
Fuel Tank Strainer Check/Clean X (2)
Combuster Chamber Inspect/Clean X (2)
Fuel Lines Check X (2)
Item Checks/Work Each Use Weekly 20hrs
(1st Month)
50hrs
(2nd Month)
100hrs
(6th Month)
300hrs
(Yearly)
Grease Main Bearing Check Level X
Fasteners Tension Check X
Clean Machine Clean X
Inspect Clutch Check/Adjust X (2)
Drive Belt Check/Adjust X
Replace X (2)
All Other Moving Parts &
Cables
Lubricate X X (2)
Engine Oil 600ml Lumag Engine 1
1 – First service only, 2 = Should be carried out by your Lumag Dealer, 3 = May need to be done more oen in dusty areas &
4 = Replace paper element only
To maximise the life of your Lumag machine it needs to be serviced and maintained at every indicated month or
operang hour interval, whichever comes rst, in accordance with the below Schedules. Please note that failure to
service your machine on schedule or use genuine Lumag parts and consumables will result in your warranty being void.

Distribution Limited
Service & Maintenance Record
Product Details: Model: __________________________________
Serial number: ____________________________ Purchase Date: ____________________________
Date: Description of checks/work carried out: Parts Used?
Y/N
Parts Invoice Number:
Dealers Name:
Engineers Name:
Engineers Signature:
Please note that failure to service your machine on schedule or use genuine Lumag parts and consumables will result in your warranty being void

Distribution Limited
Service & Maintenance Record
Product Details: Model: __________________________________
Serial number: ____________________________ Purchase Date: ____________________________
Date: Description of checks/work carried out: Parts Used?
Y/N
Parts Invoice Number:
Dealers Name:
Engineers Name:
Engineers Signature:
Please note that failure to service your machine on schedule or use genuine Lumag parts and consumables will result in your warranty being void

Table of Contents
1
Table of Contents
PART I: General Safety Rules .......................................................................................................... 2
PART II: Familiar with Your Trencher .............................................................................................. 7
PART III: Operating the Trencher ..................................................................................................... 9
PART IV: Maintaining Your Trencher ............................................................................................. 15
PART V: Troubleshooting and Parts List ........................................................................................ 17
Conventions used in this manual
WARNING
This indicates a hazardous situation, which, if not avoided, could result in death or
serious injury.
CAUTION
This indicates a hazardous situation, which, if not avoided, could result in minor or
moderate injury.
NOTICE
This information is important in proper using of your machine. Failure to follow this
instruction could result in damage to your machine or property.
Additional Information and Potential Changes
We reserve the right to discontinue, change, and improve its products at any time
without notice or obligation to the purchaser. The descriptions and specifications
contained in this manual were in effect at printing. Equipment described within this
manual may be optional. Some illustrations may not be applicable to your machine.

Part I: General Safety Rules
2
PART I: General Safety Rules
Safety Labels May Be Found on Your Unit

Part I: General Safety Rules
3
WARNING
This machine can cause serious injury to the operator and bystanders. The warning and
safety instructions in this manual must be followed to provide reasonable safety and
efficiency in using and storing. The operator is responsible for following the warnings and
instructions in this manual and the trencher. Read the entire Operator’s Manual before
using this trencher! Restrict the use of this trencher to persons who read, understand, and
follow the warnings and instructions in this manual and on the trencher. If you have not
read and understand the warnings and instructions in this manual and on the trencher, you
are not qualified to operate this trencher! Become familiar with the operation and service
recommendations to ensure the best performance of your machine.
Propose
CAUTION
This machine is designed solely to dig trench and must not be used for any other
purpose.
It should only be used by trained operators who are familiar with the content of this
manual. It is potentially hazardous to fit or use any parts other than your dealer parts.
We disclaim all liability for the consequences of such use, which in addition voids the
machine warranty.

Part I: General Safety Rules
4
Before using the Trencher
NOTICE
A．
．．． Operators must be fully trained before using this machine.
B．
．．． User Manual is read and understood.
C．
．．． Blades are in good condition and secure. All blades are sharpened or replaced in
sets.
D．
．．． All fasteners are checked for tightness.
When using the Trencher
WARNING
A. Maintain strict discipline at all times and service machine at specified periods.
B. Keep body parts, foreign objects and clothing clear of rotating auger and digging chain.
C. Coming into contact with buried utilities while digging can cause severe injuries or
DEATH.
D. Contact appropriate utility representatives to determine if/where electrical cables, gas
lines, water lines, etc. are buried BEFORE operation.
E. DO NOT operate the machine whilst under the influence of alcohol or drugs.
Protecting Yourself and Those around You
WARNING
This is a high-powered machine, with moving parts operating with high energy. You must
operate the machine safely. Unsafe operation can create a number of hazards for you, as
well as anyone else in the nearby area. Always take the following precautions when using
this machine:
A. Keep in mind that the operator or user is responsible for accidents or hazards occurring
to other people, their property, and themselves.
B. Always wear protective goggles or safety glasses with side shields while using the
Trencher to protect your eyes from possible thrown debris.
C. Avoid wearing loose clothing or jewelry, which can catch on moving parts.
D. Wear shoes with non-slip treads when using your Trencher. If you have safety shoes, we
recommend wearing them. Do not use the machine while barefoot or wearing open
sandals.
E. Keep bystanders at least 50 feet away from your work area at all times. Stop the engine
when another person or pet approaches.
Safety for Children and Pets
WARNING
Tragic accidents can occur if the operator is not alert to the presence of children and pets.
Children are often attracted to the machine and the digging activity. Never assume that

Part I: General Safety Rules
5
children will remain where you last saw them. Always follow these precautions:
A. Keep children and pets at least 50 feet from the working area and ensure they are under
the watchful care of a responsible adult.
B. Be alert and turn the machine off if children or pets enter the work area.
C. Never allow children to operate the Trencher.
Safety with Gasoline - Powered Machines
WARNING
Gasoline is a highly flammable liquid. Gasoline also gives off flammable vapor that can be
easily ignited and cause a fire or explosion. Never overlook the hazards of gasoline. Always
follow these precautions:
A. Never run the engine in an enclosed area or without proper ventilation as the exhaust
from the engine contains carbon monoxide, which is an odorless, tasteless, and a deadly
poisonous gas.
B. Store all fuel and oil in containers specifically designed and approved for this purpose
and keep away from heat and open flame, and out of the reach of children.
C. Replace rubber fuel lines and grommets when worn or damaged and after 5 years of
use.
D. Fill the gasoline tank outdoors with the engine off and allow the engine to cool
completely. Don't handle gasoline if you or anyone nearby is smoking, or if you're near
anything that could cause it to ignite or explode. Reinstall the fuel tank cap and fuel
container cap securely.
E. If you spill gasoline, do not attempt to start the engine. Move the machine away from
the area of the spill and avoid creating any source of ignition until the gas vapors have
dissipated. Wipe up any spilled fuel to prevent a fire hazard and properly dispose of the
waste.
F. Allow the engine to cool completely before storing in any enclosure. Never store a
machine that has gasoline in the tank, or a fuel container, near an open flame or spark
such as a water heater, space heater, clothes dryer or furnace.
G. Never make adjustments or repairs with the engine running. Shut down the engine,
disconnect the spark plug wire, keeping it away from the spark plug to prevent
accidental starting, wait 5 minutes before making adjustments or repairs.
H. Never tamper with the engine’s governor setting. The governor controls the maximum
safe operation speed and protects the engine. Over-speeding the engine is dangerous
and will cause damage to the engine and to the other moving parts of the machine. If
required, see your authorized dealer for engine governor adjustments.
I. Keep combustible substances away from the engine when it is hot.
J. Never cover the machine while the muffler is still hot.
K. Do not operate the engine with the air cleaner or the carburetor air intake cover
removed. Removal of such parts could create a fire hazard. Do not use flammable
solutions to clean the air filter.

Part I: General Safety Rules
6
L. The muffler and engine become very hot and can cause a severe burn; do not touch.
General Safety
WARNING
Operating this Trencher safely is necessary to prevent or minimize the risk of death or
serious injury. Unsafe operation can create a number of hazards for you. Always take the
following precautions when operating:
A. Your Trencher is a powerful tool, not a plaything. Exercise extreme caution at all times.
The machine is designed to dig trench. Do not use it for any other purpose.
B. Know how to stop the Trencher quickly.
C. Exercise caution to avoid slipping or falling.
D. See manufacturer’s instructions for proper operation and installation of accessories.
E. Never use the machine without ensuring that all guards and shields are in place.
F. Never, under any conditions, remove, bend, cut, fit, weld, or otherwise alter standard
parts on the Trencher. This includes all shields and guards. Modifications to your
machine could cause personal injuries and property damage and will invalid your
warranty.
G. If the machine start to make an unusual noise or vibrate, shut down the engine,
disconnect the spark plug wire, keeping it away from the spark plug to prevent
accidental starting, wait 5 minutes for engine to cool down, then inspect for damage.
Vibration is generally a warning of trouble. Check damaged parts and clean, repair
and/or replace as necessary.
H. Never tamper with safety devices. Check their proper operation regularly.
I. Before performing any maintenance or inspection procedure, shut down the engine,
disconnect the spark plug wire keeping it away from the spark plug to prevent
accidental starting, wait 5 minutes for machine to cool down.
J. Never allow people who are unfamiliar with these instructions to use the Trencher.
Allow only responsible individuals who are familiar with these rules of safe operation to
use your machine.
K. Never overload or attempt to dig trenches beyond the manufacturer’s recommendation.
It could result in personal injury or damage to the machine.
L. While using, don't hurry or take things for granted. When in doubt about the
equipment or your surroundings stop the machine and take time to look things over.
M. Never operate the machine when under the influence of alcohol, drugs, or medication.
N. Use the machine only in daylight.
O. Stay alert for hidden hazards or traffic.
P. Keep all nuts and bolts tight and keep the equipment in good operating condition.
A Note to All Users
List of warnings and cautions cannot be all-inclusive. If situations occur that are not covered
by this manual, the operator must apply common sense and operate this TRENCHER in a
safe manner. Contact the dealers for assistance in your area.

Part II: Familiar with Your Trencher
7
PART II: Familiar with Your Trencher
It may be helpful to familiarize yourself with the controls and features of the Trencher.
If you have any question, please contact the dealers in your area.

Part II: Familiar with Your Trencher
8
TECHNICAL SPECIFICATIONS
PARAMETER SPECIFICATION
Model GF-450
Start Recoil Start
Engine LONCIN G200F 4,0 kW four strokes, 3600rpm
Power Gasoline/petrol
Trench Capacity 60 m/hour
Trench Width 100 mm
Trench Depth 150,250,340,450 mm
Blade 21 carbide alloy blades
Chain Length 1600mm
Chain Speed(Max) 550m/min
Tire 145/7.0-6
Overall Height 800 mm
Overall Length 1560 mm
Overall Width 700 mm
Weight 135 kgs
NOTICE
A. It is your responsibility as the operator of this piece of equipment to know what
specific requirements, precautions and work hazards exist. You must read and
understand all of the information contained in the user manual.
B. The trencher is a small, operator propelled, chain-type trencher designed for the
installation of lines that require a narrow shallow trench. It has more than enough
power to trench through the toughest soils, however, because of its small size, low
horse power and trench capacity, it is limited in what it is capable of doing. The
job site, soil conditions, job specifications and operator experience may dictate
that a different tool or method be used to do the job.
C. The digging chain has a tendency to pull the trencher in the opposite direction you
want to dig. For this reason, be sure that the digging teeth are not in contact with
the ground or other objects while starting the engine and that the wheel lock
device engages before lowering the digging bar into the ground. Be sure that you
have a firm grip on the machine and are ready to control it when the digging bar
comes in contact with the ground.
D. The trencher has a tendency to “hop” or “buck” under certain conditions. This can
be the result of certain soil conditions or buried objects that the trencher cannot
cut through or lift to the surface. The trencher must be stopped and the object
removed, or restarts the trench beyond the object.

Part III: Operating the Trencher
9
PART III: Operating the Trencher
It may be helpful to better familiarize yourself with the features of your Trencher before
beginning the steps outlined in this chapter.
CAUTION
A. Read and understand all instructions, safety precautions, and/or warnings listed
in “PART I: General Safety Rules” before operating the TRENCHER. If any doubt or
question arises about the correct or safe method of performing anything found in
this manual, please contact the dealers in your area.
B. Before loading and operating the Trencher, always wear protective gear,
including safety goggles, hearing protection, tight-fitting gloves without draw
strings or loose cuffs, and steel-toed shoes.
Assembling
Step 1: Assembling the handle system

Part III: Operating the Trencher
10
Ref.No. Description Ref.No. Description
1 main frame 49 lower handle
4 cotter pin 53 angle arm
39 shift handle and spring 67 M8*45 hexagon bolt
41 M8 bolt 68 M8*20 hexagon bolt
47 upper handle 69 Coil fixation
48 M16 bolt
a. Secure lower handle(49) to the main frame(1) tightly.
b. Assemble upper handle(47) to the lower handle(49), secure them with bolt(48) and angle
arm(53) tightly.
c. Plug shift arm(39) to the right place as figure shows and hold them with bolt(41) and
spring(39), then secure another side of spring with pin(4) to the arm(39).
d. Assemble Coil fixation(69) to the main frame(1) and secure with bolt(68) tightly.
Step 2: Assembling the blade system
Ref.No. Description Ref.No. Description
2 chain axle plate 14 Chain Cover
3 chain lock 55 M12 bolt
4 cotter pin 67 M8*45 hexagon bolt
6 chain 70 Chain cover fixation
13 chain adapter

Part III: Operating the Trencher
11
a. Plug chain adapter(13) to the chain axle(2);
b. Hold the chain(6) around chain adapter(13) and axle(2), then secure two head of the
chain with chain pin(4) and chain lock(3);
c. Secure bolt(55) until the chain is tight enough;
d. Assemble chain cover(14) to the fixation(70) and secure with bolt(67) tightly.
Starting
Be sure the depth control is in the “0” depth position and move both stop switches to the
“ON” position. Always stand to the rear of the trencher, away from the side delivery auger
and digging chain while starting the engine. Always start the trencher at the job site and
allow it to warm up. While the machine is running, check that all controls are working
properly before using.
Start the engine following the procedures:
1. Make sure the fuel shut-off valve is in the “ON” position.
2. Move the choke control lever to the “CHOKE” position (should only be needed if the
engine is cold).
3. Move the throttle control lever to the “FAST” position.
4. Recoil Start: Turn the Ignition Switch to the “On” position. Push the handle of flameout
switch and grasp the recoil starter handle and slowly pull until you feel resistance. Let
the cord retract a little bit then pull the cord rapidly to start the engine. One or two
pulls usually starts the engine.
5. Move the choke control lever (if used for cold engine) slowly back to the “RUN”
position when the engine is running well.
6. If the Trencher has not been running (cold engine), warm up the engine by running the
engine at half throttle for 3 to 4 minutes, then advance the engine throttle control to the
maximum speed.

Part III: Operating the Trencher
12
Trenching
Be sure the digging chain is not turning when the engine is at an idle. Be sure the engine is
off or at an idle before moving the trencher at the job site.
Figure 1
WORK POSITION TRENCH DEPTH
Depth “0” 0mm
Depth “1” 150mm
Depth “2” 250mm
Depth “3” 340mm
Depth “4” 450mm
NOTE: All depths are approximate. Actual depth may vary depending upon
soil conditions and trencher blade wear.
Also, soil conditions and operator experience will dictate actual trenching action and speed.
A general description on how to trench:
1. With the engine running and at an idle and the depth control in the depth “0”, apply
downward pressure on the handle to raise the digging chain.
2. Lift the depth control handle and slowly move the lever forward into the desired depth
notch.
3. Apply downward pressure to the handlebar so the digging chain is not in contact with
the ground. Increase the engine speed and hold on to the handlebar with both hands.
Slowly relieve the downward pressure on the handlebar allowing the digging chain to
penetrate the soil until the chosen depth is reached.

Part III: Operating the Trencher
13
4. Using an intermittent pulling action, pull the trencher toward you 4 to 6 inches then
relax your pull, allowing the trencher to again reach the chosen depth.
5. Repeat this action until you have finished the job. The wheel lock will aid you in this
operation by helping to hold the trencher in position until the next motion is started.
Stopping
There are two stop switches on the trencher; one on the handle bar and one on the engine.
Refer to the engine manual for the switch location on your trencher. The operator can turn
the trencher off at any time by switching either stop switch to the “OFF” position. Both
switches must be “ON” before the engine can start.
Stopping the engine following the procedures:
1. Switching stop switch on handle.
2. Move the Throttle Lever to IDLE.
3. Recoil Start: Turn the Ignition Switch to the OFF position.
4. Electric Start: Turn the Key to the OFF position.
When Blocked
If the Chain stops moving while digging trenches, the engine should be stopped, take out the
muds or anything which stuck the chain, then restart the engine, and start digging again.
Operator Safety
WARNING
A. All the rack and pinion should be greased before every use.
B. Always wear the proper clothing and protective gear. Eye and ear protection, hard hat,
boots, gloves and dust masks are that may be required.
C. Keep hair, fingers, and all other body parts away from openings and moving parts.
Always wear, long pants, boots, and gloves. Secure hair so it is above shoulder length.
D. Do not operate trencher indoors. Outdoor use only.
E. Do not operate trencher when tired, ill, or under the influence of alcohol, drugs, or
medication.
F. Always assume the digging location contains underground utilities. Contact appropriate
utility company to determine where electrical cables, gas lines, water lines, etc. are
buried before operation.
G. Always use extreme caution while operating tool. Be sure of your footing and physical
capabilities.
Tools Safety
CAUTION
A. Inspect entire trencher before each use. Replace damaged or worn parts.
B. Check for fuel leaks and make sure all fasteners are in place and securely fastened.
C. Replace digging blades that are severely worn. Be sure the digging chain and engine is
not moving.