red roo HT912 Use and care manual

GT622
GARDEN TILLER
Commercial Environmental Equipment
Operation, Safety & Maintenance Instructions
™
GT622
Commercial Environmental Equipment
Online Demonstration Available at: www.redroo.com/products/trenchers
HT912
HYDRAULIC
TRENCHER

Dear Valued Customer
Congratulations! You are now the proud owner of the Red Roo Model
Hydraulic Trencher. Please take a moment of your time to look over the
method of operation. Pay particular attention to the
following information. Familiarise yourself with the trencher, its
characteristics and
safety and operating instructions.
If you have any questions or need any replacement parts in the future please
contact us at your convenience on our toll-free phone number 1300 133 767
or redroo.com
You alone know the operational demands and special conditions affecting
the equipment in your situation and therefore assume the responsibility
for developing, carrying out and enforcing the safety concepts which
apply to your own operation to effect the greatest safety for yourself and
the people around you.
THANK YOU for your patronage, confidence and support in
Red Roo Commercial Environmental Equipment.
INTRODUCTION
Machine Indentication Record:
Red Roo Customer number
Machine model number
Machine serial number
Engine manufacturer
Engine model number
Engine serial number
Dear Valued Customer
Congratulations! You are now the proud owner of the Red Roo Model
Hydraulic Trencher. Please take a moment of your time to look over the
method of operation. Pay particular attention to the
following information. Familiarise yourself with the trencher, its
characteristics and
safety and operating instructions.
If you have any questions or need any replacement parts in the future please
contact us at your convenience on our toll-free phone number 1300 133 767
or redroo.com
You alone know the operational demands and special conditions affecting
the equipment in your situation and therefore assume the responsibility
for developing, carrying out and enforcing the safety concepts which
apply to your own operation to effect the greatest safety for yourself and
the people around you.
THANK YOU for your patronage, confidence and support in
Red Roo Commercial Environmental Equipment.
INTRODUCTION
HT 912

3
™
Table of Contents
ABOUT THIS MANUAL 4
SAFETY FIRST 4
SAFETY PRECAUTIONS FOR DHS-5 USERS 5
OPERATING INSTRUCTIONS 6
SERVICE INFORMATION 8
WHEEL DRIVE VALVE CABLE ADJUSTMENT 9
WHEEL DRIVE NEUTRAL ADJUSTMENT 9
TROUBLESHOOTING 11
CHAIN VALVE ADJUSTMENT 10
LUBRICATION RERQUIREMENTS 10
PARTS LIST 13
WEB INFORMATION 30
WARRANTY POLICY 31
RED ROO SALES & SERVICE COMPANY PTY. LTD.
41-43 Keysborough Avenue, Keysborough, Victoria, Australia 3173
Tel.: [phone] Fax: [phone]
Outside Melbourne Metro: Tel.: [phone] Fax: [phone]
redroo.com

SAFETY FIRST – Stay Alert, Do Not Get Hurt
Read this section before use!
The HT912 Hydraulic Trencher is designed to dig trenches and therefore is potentially
dangerous. Careless or improper use may cause serious or even fatal injury.
It is important that you read and understand the contents of this manual and that you allow only
mature,adultindividuals to operate yourHT912 Hydraulic Trencher. It is yourresponsibility to
ensure that any individual who operates your Trencher have read and understood this manual.
Never use the Hydraulic Trencher for any other purpose than digging trenches. The machine is
designed for this purpose only. Any other use may cause serious or even fatal injury and/or damage
to the machine.
ABOUT THIS MANUAL
The information contained in this manual has been prepared to assist you in the safe operation, the routine
maintenanceandgeneralcare of yourRedRooproduct. By following theseguidelines,youmaylook
forward to years of reliableservice fromyourRedRoo. Information is categorisedanddenoted by the
following symbols and phrases:
SAFETY Identifies general safety practices.
FIRST
DANGER! An instruction which, if not followed, could result in serious or fatal injury.
WARNING! An instruction which, if not followed, could result in personal injury.
CAUTION! An instruction which, if not followed, could damage machine components.
4
HAZARD SYMBOLS & MEANINGS
Before operatingthisMachine read
andobserve all Warnings, Cautions
andInstructions on theMachineand
in theOperatorsManual. Although the
reading of information contained in
thismanualdoesnoteliminatethe
risk involved in operatingthis
machine,yourunderstanding of this
information will promotethe correct
andsafeuse of yourmachine.Failure
to followInstructionsandSafety
Informationcould result in serious
injury or death.
Read Hearing
Protection
Eye
Protection
Wear
Gloves
Cut Hand
No
Bystanders
High Pressure
Fluid
Moving
Parts
Hot
Surfaces
Don’t Refuel
Hot Engine
Check Before
Digging
Explosion
Electrical
Shock
Toxic
Fumes
Remove Spark
Plug Leads
Identifies general safety practices.
An instruction which, if not followed, could result in serious or fatal injury.
An instruction which, if not followed, could result in personal injury.
An instruction which, if not followed, could damage machine components.

USE COMMON SENSE AND PLENTY OF IT
1) DO NOTallowanyperson to operate the hydraulictrencher withoutfirst readingand
understanding the safety precautionsandoperatinginstructions. KNOWTHECONTROLSAND
HOW TO STOPTHEHYDRAULICTRENCHER QUICKLY IN AN EMERGENCY.
RELEASE CONTROL LEVER TO STOP THE MACHINE.
2) NEVER allow children or untrained adults to operate the hydraulic trencher.
3) ALWAYSwearprotective clothingwhenoperating the hydraulictrencher. Thisincludes, but is not
limited to: safety glasses, hardhat, loose fittinggloves, steelcappedboots andhearingprotection.NEVER
wearloose fittingclothing or jewellery whenoperating the hydraulictrencher.
Keepallclothingawayfrommovingparts.Itemscouldbecomecaught in the
machine, resulting in injury.
4) ALWAYS use hydraulic trencher in a well lit area.
5) ALWAYSmake certain the hydraulic couplings are properly connected prior tostarting the engine.
6) NEVERoperate hydraulictrencher onaslopethatexceeds 15˚. Trenching on an incline is
dangerous and not recommended.
7) Police the area before trenching.Remove any foreignobjects in the trenching area eg bricks,
rocks,wire andsticks.Locate and mark any sprinklerheads, water pipes, gaslines, electrical
and telephone cables or any other hazard either below or above ground.
8) DO NOTallow otherpersonsnear the hydraulictrencher. It is up to the operator to keep
bystanders and animals aminimum of 6metres (18ft) away from the machine while in operation.
9) NEVERoperate the hydraulictrencher when fatigued.ALWAYS BE ALERT!If you gettiredwhile
operating the hydraulictrencher, take a break. If you have anytype of physical or mental conditionthat
may be aggravated by strenuouswork, check with yourphysicianbefore you operate thisequipment. NEVER
operate the hydraulic trencher under the influence of medication, alcohol or drugs.
11) DO NOT leave the machine unattended while the engine is running.
12) DO NOT overspeed the engine or alter the governor settings. Excessive speed is dangerous and will
shorten engine life.
13) WARNING: Keep away from exhaust muffler during or soon after operation.
14) NEVERoperate the hydraulic trencher in an enclosed area. Engine exhaust contains carbon monoxide,
an odourless and tasteless poison.
15) WARNING:Hydraulic oil is under extreme pressure and can get under skin and burn or poison.
Do not operate unit with leaking or faulty hose connections or worn, cut hydraulic lines.
16) STOPthe engineanddisconnect the sparkpluglead(s) andallowengine to coolbeforeinspecting or
performing maintenance on the hydraulic trencher.
17) REFUELLING
* Shut off engine. DO NOT REFUEL AN ENGINE WHILE OPERATING!
* Allow engine to cool. Minimum 5 minutes.
*USE UNLEADED FUEL ONLY. Use clean, fresh unleaded fuel.
*Do not mix oil with unleaded fuel.
* Do not over-fill fuel tank. Allow space for fuel expansion.
* Do not smoke near equipment.
* Allow no naked flame or hot material in refuelling area.
* Use only approved fuel containers and funnels. Remember, fuel is a potential hazard.
* Refer to engine owners manual for full details.
SAFETY PRECAUTIONS FOR HT912 USERS
Outdoor Power Equipment Institute Recommendations
WARNING TO PURCHASERS OF INTERNAL COMBUSTION
ENGINE EQUIPPED MACHINERY OR DEVICES:
The equipmentwhich you have purchases doesnothave a spark arrester muffler. If thisequipment
is to be used on any forest and brush covered land or grass covered unimproved land, the law may
requirethatasparkarrester muffler be installedand be in effectiveworkingorder. The spark
arrester must be attached tothe exhaust system and comply with local authorities by-laws.
5
10) ALWAYSKEEP YOUR HANDS,FEETAND BODY AWAY FROM THE TRENCHING
AREA WHILE ENGINE IS RUNNING.
USE COMMON SENSE AND PLENTY OF IT
1) DO NOTallowanyperson to operate the hydraulictrencher withoutfirst readingand
understanding the safety precautionsandoperatinginstructions. KNOWTHECONTROLSAND
HOW TO STOPTHEHYDRAULICTRENCHER QUICKLY IN AN EMERGENCY.
RELEASE CONTROL LEVER TO STOP THE MACHINE.
2) NEVER allow children or untrained adults to operate the hydraulic trencher.
3) ALWAYSwearprotective clothingwhenoperating the hydraulictrencher. Thisincludes, but is not
limited to: safety glasses, hardhat, loose fittinggloves, steelcappedboots andhearingprotection.NEVER
wearloose fittingclothing or jewellery whenoperating the hydraulictrencher.
Keepallclothingawayfrommovingparts.Itemscouldbecomecaught in the
machine, resulting in injury.
4) ALWAYS use hydraulic trencher in a well lit area.
5) ALWAYSmake certain the hydraulic couplings are properly connected prior tostarting the engine.
6) NEVERoperate hydraulictrencher onaslopethatexceeds 15˚. Trenching on an incline is
dangerous and not recommended.
7) Police the area before trenching.Remove any foreignobjects in the trenching area eg bricks,
rocks,wire andsticks.Locate and mark any sprinklerheads, water pipes, gaslines, electrical
and telephone cables or any other hazard either below or above ground.
8) DO NOTallow otherpersonsnear the hydraulictrencher. It is up to the operator to keep
bystanders and animals aminimum of 6metres (18ft) away from the machine while in operation.
9) NEVERoperate the hydraulictrencher when fatigued.ALWAYS BE ALERT!If you gettiredwhile
operating the hydraulictrencher, take a break. If you have anytype of physical or mental conditionthat
may be aggravated by strenuouswork, check with yourphysicianbefore you operate thisequipment. NEVER
operate the hydraulic trencher under the influence of medication, alcohol or drugs.
11) DO NOT leave the machine unattended while the engine is running.
12) DO NOT overspeed the engine or alter the governor settings. Excessive speed is dangerous and will
shorten engine life.
13) WARNING: Keep away from exhaust muffler during or soon after operation.
14) NEVERoperate the hydraulic trencher in an enclosed area. Engine exhaust contains carbon monoxide,
an odourless and tasteless poison.
15) WARNING:Hydraulic oil is under extreme pressure and can get under skin and burn or poison.
Do not operate unit with leaking or faulty hose connections or worn, cut hydraulic lines.
16) STOPthe engineanddisconnect the sparkpluglead(s) andallowengine to coolbeforeinspecting or
performing maintenance on the hydraulic trencher.
17) REFUELLING
* Shut off engine. DO NOT REFUEL AN ENGINE WHILE OPERATING!
* Allow engine to cool. Minimum 5 minutes.
*USE UNLEADED FUEL ONLY. Use clean, fresh unleaded fuel.
*Do not mix oil with unleaded fuel.
* Do not over-fill fuel tank. Allow space for fuel expansion.
* Do not smoke near equipment.
* Allow no naked flame or hot material in refuelling area.
* Use only approved fuel containers and funnels. Remember, fuel is a potential hazard.
* Refer to engine owners manual for full details.
SAFETY PRECAUTIONS FOR HT912 USERS
Outdoor Power Equipment Institute Recommendations
WARNING TO PURCHASERS OF INTERNAL COMBUSTION
ENGINE EQUIPPED MACHINERY OR DEVICES:
The equipmentwhich you have purchases doesnothave a spark arrester muffler. If thisequipment
is to be used on any forest and brush covered land or grass covered unimproved land, the law may
requirethatasparkarrester muffler be installedand be in effectiveworkingorder. The spark
arrester must be attached tothe exhaust system and comply with local authorities by-laws.
5
10) ALWAYSKEEP YOUR HANDS,FEETAND BODY AWAY FROM THE TRENCHING
AREA WHILE ENGINE IS RUNNING.

OPERATING INSTRUCTIONS - HT912
BEFORE USE
1) Police the area. Remove any foreign objects from the area.
2) Identify and mark the location of sprinkler heads, gas pipes, telephone cables, etc.
OPERATION
1) Familiarize yourself with the hydraulic trencher and its controls.
2)
6
IGNITION: Must be in “ON” position to start. “OFF” to stop.
ENGINE: Throttle cable controls engine speed. Operate at full throttle (all the way forward).
WHEEL DRIVE CONTROL LEVER: Controls wheel speed forward or reverse after clutch lever is engaged.
DIGGING BOOM CONTROL LEVER: Raises and lowers the digging boom.
DIGGING CHAIN CONTROL LEVER: must be in “ON” position BEFORE clutch lever is depressed in order
to start chain in motion. Chain moves in a forward direction after clutch lever is engaged.
SAFETY CLUTCH LEVER/OPERATOR PRESENCE CONTROL:( At left handle grip) As the operator stands
DRIVE and DIGGING CHAIN controls when depressed. Stops all motion when released.
FORWARD/REVERSE DIGGING CHAIN CONTROL LEVER: Allows manual operation of chain in forward
or reverse rotation to dislodge objects or dig difficult terrain. (This control can be used with the clutch lever
released.) To reverse chain, DIGGING CHAIN control must be in “OFF” position.
FREE WHEEL HUB FEATURE - Operation: Pull one free wheeling pin slightly, using the
split ring. Rotate the pin until the 3mm (1/8”) diameter roll pin aligns with the slot in the
mounting plate. Allow the pin to slide through the slot. Repeat for the other wheel. Roll the
trencher until each pin drops into a hole in the hub. The wheel hubs are now locked.
Reverse the procedure to unlock the wheels.
3.
a. Move the fuel valve lever to ON position.
b. To start a cold engine, move the choke lever or
choke rod (applicable types) to the CLOSED position.
To restart a warm engine, leave the choke lever or
choke rod in the OPEN position.
STARTING THE ENGINE:
c. Move the throttle lever away from the MIN position,
about 1/3 of the way toward the MAX position.
d. Turning the engine switch to the ON position.
RECOIL STARTER
Pull the starter grip lightly until you feel resistance, then pull briskly.
Return the starter grip gently.
1. Remove the hydraulic trencher from its trailer. Use caution.
READ SAFETY INSTRUCTIONS BEFORE OPERATING!
Be sure that the engine oil, fuel and hydraulic oil are at proper levels before starting the engine.
STUDY AND UNDERSTAND CONTROLS BEFORE BEGINNING OPERATION
TRANSPORT
OPERATING INSTRUCTIONS - HT912
BEFORE USE
1) Police the area. Remove any foreign objects from the area.
2) Identify and mark the location of sprinkler heads, gas pipes, telephone cables, etc.
OPERATION
1) Familiarize yourself with the hydraulic trencher and its controls.
2)
6
IGNITION: Must be in “ON” position to start. “OFF” to stop.
ENGINE: Throttle cable controls engine speed. Operate at full throttle (all the way forward).
WHEEL DRIVE CONTROL LEVER: Controls wheel speed forward or reverse after clutch lever is engaged.
DIGGING BOOM CONTROL LEVER: Raises and lowers the digging boom.
DIGGING CHAIN CONTROL LEVER: must be in “ON” position BEFORE clutch lever is depressed in order
to start chain in motion. Chain moves in a forward direction after clutch lever is engaged.
SAFETY CLUTCH LEVER/OPERATOR PRESENCE CONTROL:( At left handle grip) As the operator stands
DRIVE and DIGGING CHAIN controls when depressed. Stops all motion when released.
FORWARD/REVERSE DIGGING CHAIN CONTROL LEVER: Allows manual operation of chain in forward
or reverse rotation to dislodge objects or dig difficult terrain. (This control can be used with the clutch lever
released.) To reverse chain, DIGGING CHAIN control must be in “OFF” position.
FREE WHEEL HUB FEATURE - Operation: Pull one free wheeling pin slightly, using the
split ring. Rotate the pin until the 3mm (1/8”) diameter roll pin aligns with the slot in the
mounting plate. Allow the pin to slide through the slot. Repeat for the other wheel. Roll the
trencher until each pin drops into a hole in the hub. The wheel hubs are now locked.
Reverse the procedure to unlock the wheels.
3.
a. Move the fuel valve lever to ON position.
b. To start a cold engine, move the choke lever or
choke rod (applicable types) to the CLOSED position.
To restart a warm engine, leave the choke lever or
choke rod in the OPEN position.
STARTING THE ENGINE:
c. Move the throttle lever away from the MIN position,
about 1/3 of the way toward the MAX position.
d. Turning the engine switch to the ON position.
RECOIL STARTER
Pull the starter grip lightly until you feel resistance, then pull briskly.
Return the starter grip gently.
1. Remove the hydraulic trencher from its trailer. Use caution.
READ SAFETY INSTRUCTIONS BEFORE OPERATING!
Be sure that the engine oil, fuel and hydraulic oil are at proper levels before starting the engine.
STUDY AND UNDERSTAND CONTROLS BEFORE BEGINNING OPERATION
TRANSPORT
SAFETY CLUTCH LEVER/OPERATOR PRESENCE CONTROL: (At left handle grip as the operator
stands behind the machine) in the operator position. Activates WHEEL DRIVE and DIGGING CHAIN
controls when depressed. Stops all motion when released.
OPERATING INSTRUCTIONS - HT912
BEFORE USE
1) Police the area. Remove any foreign objects from the area.
2) Identify and mark the location of sprinkler heads, gas pipes, telephone cables, etc.
OPERATION
1) Familiarize yourself with the hydraulic trencher and its controls.
2)
6
IGNITION: Must be in “ON” position to start. “OFF” to stop.
ENGINE: Throttle cable controls engine speed. Operate at full throttle (all the way forward).
WHEEL DRIVE CONTROL LEVER: Controls wheel speed forward or reverse after clutch lever is engaged.
DIGGING BOOM CONTROL LEVER: Raises and lowers the digging boom.
DIGGING CHAIN CONTROL LEVER: must be in “ON” position BEFORE clutch lever is depressed in order
to start chain in motion. Chain moves in a forward direction after clutch lever is engaged.
SAFETY CLUTCH LEVER/OPERATOR PRESENCE CONTROL:( At left handle grip) As the operator stands
DRIVE and DIGGING CHAIN controls when depressed. Stops all motion when released.
FORWARD/REVERSE DIGGING CHAIN CONTROL LEVER: Allows manual operation of chain in forward
or reverse rotation to dislodge objects or dig difficult terrain. (This control can be used with the clutch lever
released.) To reverse chain, DIGGING CHAIN control must be in “OFF” position.
FREE WHEEL HUB FEATURE - Operation: Pull one free wheeling pin slightly, using the
split ring. Rotate the pin until the 3mm (1/8”) diameter roll pin aligns with the slot in the
mounting plate. Allow the pin to slide through the slot. Repeat for the other wheel. Roll the
trencher until each pin drops into a hole in the hub. The wheel hubs are now locked.
Reverse the procedure to unlock the wheels.
3.
a. Move the fuel valve lever to ON position.
b. To start a cold engine, move the choke lever or
choke rod (applicable types) to the CLOSED position.
To restart a warm engine, leave the choke lever or
choke rod in the OPEN position.
STARTING THE ENGINE:
c. Move the throttle lever away from the MIN position,
about 1/3 of the way toward the MAX position.
d. Turning the engine switch to the ON position.
RECOIL STARTER
Pull the starter grip lightly until you feel resistance, then pull briskly.
Return the starter grip gently.
1. Remove the hydraulic trencher from its trailer. Use caution.
READ SAFETY INSTRUCTIONS BEFORE OPERATING!
Be sure that the engine oil, fuel and hydraulic oil are at proper levels before starting the engine.
STUDY AND UNDERSTAND CONTROLS BEFORE BEGINNING OPERATION
TRANSPORT

OPERATING INSTRUCTIONS - HT912
4. GETTING
5. TRENCHING PROCEDURE
STARTED
Start and warm up engine.
Put Wheel Drive Control Lever in neutral.
One wheel hub may be disengaged (free wheeling) for easier steering before driving machine to work.
location. (See Wheel Hub Feature)
Squeeze the Safety Clutch Lever/Operator Presence Control and change the Wheel Direction Control
to desired speed and direction.
e. Adjust the wheel speed and navigate the trencher to starting position. The trencher is designed to dig
toward the operator (with the Wheel Drive Control Lever in Reverse). With this in mind, position the
machine to start the trench.
NOTE When initially engaging the rotating chain into the ground, be aware that in hard or rocky ground
the rotating trencher chain may aggressively dig in and lurch forward. For this reason, make sure that there
is sufficient clearance from structures, objects or people in front of the machine
Make sure that there is sufficient clearance from structures, objects or people in front of the machine.
Put Wheel Drive Lever in neutral.
WARNING! –KEEP HANDS AND FEET CLEAR OF ALL MOVING PARTS AT ALL TIMES!
6. WARNING! –IN CASE OF DIFFICULTY, RELEASE THE SAFETY CLUTCH LEVER CONTROL/
OPERATOR PRESENCE CONTROL. ALL TRENCHING ACTION STOPS.
Turn the engine "STOP" button located either on the main control console or the engine.
7
7. STOPPING THE ENGINE:
a.
Be sure both hubs are engaged (turn hub lock handle clockwise). (See Free Wheel Hub Features)
Have engine at full throttle (forward).
Hold Digging Chain Control Lever in ON position.
Squeeze safety Clutch Lever/Operator Presence Control.
Slowly lower the digging boom until the desired trench depth is achieved, using the Digging Boom Control Lever.
Put Wheel Drive Control Lever in reverse. Start at slow speed.
Adjust the wheel speed until a workable speed is reached. Use a very slow speed for trenching and adjust for
soil conditions as necessary. If objects such as rocks or roots jam in the chain, release the Safety Clutch
Lever/Operator Presence Control, then reverse the chain to dislodge the debris. If necessary move the
trencher forward a few inches and trench the area again.
b.
c.
d.
e.
f.
g.
h.
a.
b.
c.
d.
a.
Shut off switch on console should be used, not shut off switch on engine.
b. Turn the engine switch to the OFF position.
c. Turn the fuel valve lever to the OFF position.
Move the throttle lever to the MIN position. Some engine applications use a
remote-mounted throttle control rather than the engine-mounted lever shown here.
AFTER USE
Wash mud and dirt off of the hydraulic trencher. Ensure no water enters the carburettor.
Remove any objects that may have wrapped around the trencher chain or assembly.
1) Turn fuel shut off valve to the "OFF" position.
2)
3)
4)
Allow machine to cool down.

SERVICE INFORMATION
8
1. Remove the trencher from shipping crate.
Install boom onto boom pivot/mount. Push boom on as far as it will go. Be sure adjuster screw is backed out.
TRENCHER ASSEMBLY INFORMATION
1.
2.
3.
4.
5.
6.
7.
8.
9.
Your trencher should arrive with 45 litres of hydraulic fluid in the tank. Check reservoir level using sight
glasss on the right side of the tank. If required, add to reserve with tractor transmission hydraulic oil.
(Shell Donax TD Fluid, Castrol Hyspin 68 or comparable).
Recheck oil level after trencher has been run and oil has circulated through wheel and chain motors.
Routinely check level thereafter.
Change hydraulic oil filter after the first 50 hours of use. Change it every 200 hours thereafter.
Add 1 quart of hydraulic oil to reservoir with each filter change.
Check all hydraulic fittings for leaks and tighten if necessary.
The grease zerk on the chain shaft housing should be greased after every 4 to 8 hours of use. The grease
zerk in the front wheel should be greased after every 8 hours of use.
Grease zerks on cylinder rod end and boom pivot should be greased daily.
Grease zerks on each side of the boom cylinder and on front wheel hub should be greased once a week.
Grease zerks on the wheel hubs and hub lock screws should be greased and freewheeled once a week
or so, depending upon free wheel use.
(See page 10 for illustrations of lubrication point).
1.
2.
3.
4.
5.
After break in, stop engine. Slide chain under sprocket, with teeth in correct cutting direction.
Properly installed, the cutting edges of the chain will face forward on the top of the boom and rearward
on the bottom of the boom. (see diagram below).
Push digging boom control lever forward to lower boom onto the chain.
Wrap chain around boom and sprocket.
Install chain master link or link pin.
Use boom adjuster screw to tighten
chain. Chain should have enough slack
to allow approximately 1” to 2” of space
between middle of boom and chain
when boom and chain are straight out
in a horizontal position.
Tighten adjuster screw locknut.
SERVICE INFORMATION
CHAIN INSTALLATION
IMPORTANT: The engine on ther RED ROO trencher may or may not have been serviced prior to shipping.
Shipping regulations may prohibit shipping with fuel or oil in the machine. Check levels and add oil and fuel
as required before starting. Service accordingly to the engine manual before starting.
WARNING: Running the trencher without hydraulic oil will cause seriuous damage to the hydraulic pump.
MAKE SURE THAT THE RESERVOIR OIL LEVEL IS TO THE SIGHT GLASS BEFORE STARTING THE MACHINE.
Forward Cutting Edge
RearwardCutting Edge
MAKE SURE THAT THE RESERVOIR OIL LEVEL IS TO THE SIGHT GLASS BEFORE
STARTING THE MACHINE
SERVICE INFORMATION
8
1. Remove the trencher from shipping crate.
Install boom onto boom pivot/mount. Push boom on as far as it will go. Be sure adjuster screw is backed out.
TRENCHER ASSEMBLY INFORMATION
1.
2.
3.
4.
5.
6.
7.
8.
9.
Your trencher should arrive with 45 litres of hydraulic fluid in the tank. Check reservoir level using sight
glasss on the right side of the tank. If required, add to reserve with tractor transmission hydraulic oil.
(Shell Donax TD Fluid, Castrol Hyspin 68 or comparable).
Recheck oil level after trencher has been run and oil has circulated through wheel and chain motors.
Routinely check level thereafter.
Change hydraulic oil filter after the first 50 hours of use. Change it every 200 hours thereafter.
Add 1 quart of hydraulic oil to reservoir with each filter change.
Check all hydraulic fittings for leaks and tighten if necessary.
The grease zerk on the chain shaft housing should be greased after every 4 to 8 hours of use. The grease
zerk in the front wheel should be greased after every 8 hours of use.
Grease zerks on cylinder rod end and boom pivot should be greased daily.
Grease zerks on each side of the boom cylinder and on front wheel hub should be greased once a week.
Grease zerks on the wheel hubs and hub lock screws should be greased and freewheeled once a week
or so, depending upon free wheel use.
(See page 10 for illustrations of lubrication point).
1.
2.
3.
4.
5.
After break in, stop engine. Slide chain under sprocket, with teeth in correct cutting direction.
Properly installed, the cutting edges of the chain will face forward on the top of the boom and rearward
on the bottom of the boom. (see diagram below).
Push digging boom control lever forward to lower boom onto the chain.
Wrap chain around boom and sprocket.
Install chain master link or link pin.
Use boom adjuster screw to tighten
chain. Chain should have enough slack
to allow approximately 1” to 2” of space
between middle of boom and chain
when boom and chain are straight out
in a horizontal position.
Tighten adjuster screw locknut.
SERVICE INFORMATION
CHAIN INSTALLATION
IMPORTANT: The engine on ther RED ROO trencher may or may not have been serviced prior to shipping.
Shipping regulations may prohibit shipping with fuel or oil in the machine. Check levels and add oil and fuel
as required before starting. Service accordingly to the engine manual before starting.
WARNING: Running the trencher without hydraulic oil will cause seriuous damage to the hydraulic pump.
MAKE SURE THAT THE RESERVOIR OIL LEVEL IS TO THE SIGHT GLASS BEFORE STARTING THE MACHINE.
Forward Cutting Edge
RearwardCutting Edge

9
The clutch cable and lever must have some free play. The cable will stretch andoccasionally needs adjustment.
WHEEL DRIVE VALVE CABLE ADJUSTMENT
1.
2.
3.
Rotate the actuator arm clockwise, by hand, to take up any free play. Measure the distance from the pin
of the actuator arm to the end of the cable housing.
Pull the clutch level all the way up until it touches the handle bar grip. With the lever pulled up, again measure
the distance from the pin of the lever to the cable housing. Calculate the difference.
Adjust the cable for 7/16” to 1/2” movement of the actuator arm at the pin. Do not include any level free play
in the measurements.
The speed control cables may need to be adjusted after some use. If the machine creeps while the speed
control is in neutral, the speed cables will need adjustment. Adjust the cables to bring the pump cable arm
to the neutral position (vertical) when the speed control also is in neutral. Adjust the cables to eliminate
slack, but do not over tighten them so they are extremely tight against each other.
WHEEL DRIVE NEUTRAL ADJUSTMENT

10
The clutch valve control should be adjusted
to completely activate the chain valve when
the dig chain control is in ‘ON’ position. To
check this adjustment, put the chain on/off
control in ON position. Pull the clutch lever
on left handle bar up until it touches the
handgrip. While holding clutch lever up, push
on the chain forward/neutral/reverse lever.
It should be at the end of its stroke, thus not
move down anymore. If the chain F/N/R lever
can be pushed down more, the valve spool
lever should be adjusted. To adjust, remove
back cover from the control panel. Loosen
the 2 bolts on the valve lever and rotate the
lever plate down about 1/16”. Re-tighten the
bolts and check the lever stroke. Adjust so
the valve lever comes to the end of its stroke
just as the clutch lever touches the handgrip
when chain valve control is in ON position.
CHAIN VALVE ADJUSTMENT
Be sure to grease all lubrication points as
outlined in this manual.
LUBRICATION
REQUIREMENTS
10
The clutch valve control should be adjusted
to completely activate the chain valve when
the dig chain control is in ‘ON’ position. To
check this adjustment, put the chain on/off
control in ON position. Pull the clutch lever
on left handle bar up until it touches the
handgrip. While holding clutch lever up, push
on the chain forward/neutral/reverse lever.
It should be at the end of its stroke, thus not
move down anymore. If the chain F/N/R lever
can be pushed down more, the valve spool
lever should be adjusted. To adjust, remove
back cover from the control panel. Loosen
the 2 bolts on the valve lever and rotate the
lever plate down about 1/16”. Re-tighten the
bolts and check the lever stroke. Adjust so
the valve lever comes to the end of its stroke
just as the clutch lever touches the handgrip
when chain valve control is in ON position.
CHAIN VALVE ADJUSTMENT
Be sure to grease all lubrication points as
outlined in this manual.
LUBRICATION
REQUIREMENTS
10
The clutch valve control should be adjusted
to completely activate the chain valve when
the dig chain control is in ‘ON’ position. To
check this adjustment, put the chain on/off
control in ON position. Pull the clutch lever
on left handle bar up until it touches the
handgrip. While holding clutch lever up, push
on the chain forward/neutral/reverse lever.
It should be at the end of its stroke, thus not
move down anymore. If the chain F/N/R lever
can be pushed down more, the valve spool
lever should be adjusted. To adjust, remove
back cover from the control panel. Loosen
the 2 bolts on the valve lever and rotate the
lever plate down about 1/16”. Re-tighten the
bolts and check the lever stroke. Adjust so
the valve lever comes to the end of its stroke
just as the clutch lever touches the handgrip
when chain valve control is in ON position.
CHAIN VALVE ADJUSTMENT
Be sure to grease all lubrication points as
outlined in this manual.
LUBRICATION
REQUIREMENTS
10
The clutch valve control should be adjusted
to completely activate the chain valve when
the dig chain control is in ‘ON’ position. To
check this adjustment, put the chain on/off
control in ON position. Pull the clutch lever
on left handle bar up until it touches the
handgrip. While holding clutch lever up, push
on the chain forward/neutral/reverse lever.
It should be at the end of its stroke, thus not
move down anymore. If the chain F/N/R lever
can be pushed down more, the valve spool
lever should be adjusted. To adjust, remove
back cover from the control panel. Loosen
the 2 bolts on the valve lever and rotate the
lever plate down about 1/16”. Re-tighten the
bolts and check the lever stroke. Adjust so
the valve lever comes to the end of its stroke
just as the clutch lever touches the handgrip
when chain valve control is in ON position.
CHAIN VALVE ADJUSTMENT
Be sure to grease all lubrication points as
outlined in this manual.
LUBRICATION
REQUIREMENTS
DAILY

1.
2
3.
.
RH912 TRENCHER TROUBLE SHOOTING GUIDE
A. Entire hydraulic system does not operate and the engine is not under load.
Broken or improperly adjusted clutch
(actuator) cable.
CAUTION!! Always use extreme care when trouble shooting or making adjustments on trencher.
Stay clear of chain and auger when engine is running. Stop engine before disassembling any component.
Hydraulic pump-to-engine coupler has
slipped
Low hydraulic oil in tank
See clutch cable and actuator arm adjustment.
Add oil until it shows in sight gauge
Check for wear and replace both coupler
halves and rubber spider, as needed.
1.
2
3.
.
B. Engine lugs down or dies and wheels and chain do not turn.
Rocks or other obstructions stopping chain.
Engine improperly tuned or maintained.
Trenching depth or speed too great for
soil conditions.
Reverse chain momentarily to free from obstruction.
Raise boom and stop chain. See if obstruction can
be removed from trench.
Decrease ground speed or trenching depth.
See engine manual and correct as needed.
5. Engine losing power due to wear. See engine manual.
4.
Low oil alert causes engine to shut down. This may occur when trenching on hills. Level
trencher, check oil and allow oil alert to reset.
1.
2.
C. Chain fails to rotate, but wheel drive works.
Chain motor worn.
Chain Control Relief Valve Malfunctioning
Rebuild motor or replace with exchange motor
Adjust Relief Valve to 2200psi or replace relief
spring if needed.
11
1.
2
3.
.
RH912 TRENCHER TROUBLE SHOOTING GUIDE
A. Entire hydraulic system does not operate and the engine is not under load.
Broken or improperly adjusted clutch
(actuator) cable.
CAUTION!! Always use extreme care when trouble shooting or making adjustments on trencher.
Stay clear of chain and auger when engine is running. Stop engine before disassembling any component.
Hydraulic pump-to-engine coupler has
slipped
Low hydraulic oil in tank
See clutch cable and actuator arm adjustment.
Add oil until it shows in sight gauge
Check for wear and replace both coupler
halves and rubber spider, as needed.
1.
2
3.
.
B. Engine lugs down or dies and wheels and chain do not turn.
Rocks or other obstructions stopping chain.
Engine improperly tuned or maintained.
Trenching depth or speed too great for
soil conditions.
Reverse chain momentarily to free from obstruction.
Raise boom and stop chain. See if obstruction can
be removed from trench.
Decrease ground speed or trenching depth.
See engine manual and correct as needed.
5. Engine losing power due to wear. See engine manual.
4.
Low oil alert causes engine to shut down. This may occur when trenching on hills. Level
trencher, check oil and allow oil alert to reset.
1.
2.
C. Chain fails to rotate, but wheel drive works.
Chain motor worn.
Chain Control Relief Valve Malfunctioning
Rebuild motor or replace with exchange motor
Adjust Relief Valve to 2200psi or replace relief
spring if needed.
11
HT912 TRENCHER TROUBLE SHOOTING GUIDE

1.
2
3.
.
D. Wheel fails to turn, but chain rotates.
Hub unlocked
Wheel Drive Valve not fully activated
Wheel axle key sheared
Lock the hubs.
Replace key and other parts as needed
Adjust valve cable
4.
5.
Pump Cable Lever loose on shaft
Speed cable broken or disconnected Replace or re-connect cable
Tighten setscrew on Pump Lever
1.
2.
E. Oil leaks in hydraulic system.
Fittings are loose
Worn or broken hoses
Tighten fittings on hoses and adapters
Replace damaged hoses
3. Oil around chain motor or shaft Inspect motor for leaking shaft seal.
Rebuild motor or replace with exchange motor.
1.
G. Boom does not lift, or does not lower into ground.
Boom lift relief valve malfunctioning Adjust relief to 500 psi. This may require a
replacement spring in valve
1.
F. Foaming hydraulic oil coming from breather hose.
Improper oil used. Verify that hydraulic oil used had antifoaming
additives. Recommended oil is tractor hydraulic.
(Shell Donax TD or comparable)
RH912 TRENCHER TROUBLE SHOOTING GUIDE (CONT.)
12
1.
2
3.
.
D. Wheel fails to turn, but chain rotates.
Hub unlocked
Wheel Drive Valve not fully activated
Wheel axle key sheared
Lock the hubs.
Replace key and other parts as needed
Adjust valve cable
4.
5.
Pump Cable Lever loose on shaft
Speed cable broken or disconnected Replace or re-connect cable
Tighten setscrew on Pump Lever
1.
2.
E. Oil leaks in hydraulic system.
Fittings are loose
Worn or broken hoses
Tighten fittings on hoses and adapters
Replace damaged hoses
3. Oil around chain motor or shaft Inspect motor for leaking shaft seal.
Rebuild motor or replace with exchange motor.
1.
G. Boom does not lift, or does not lower into ground.
Boom lift relief valve malfunctioning Adjust relief to 500 psi. This may require a
replacement spring in valve
1.
F. Foaming hydraulic oil coming from breather hose.
Improper oil used. Verify that hydraulic oil used had antifoaming
additives. Recommended oil is tractor hydraulic.
(Shell Donax TD or comparable)
RH912 TRENCHER TROUBLE SHOOTING GUIDE (CONT.)
12
HT912 TRENCHER TROUBLE SHOOTING GUIDE (CONT.)

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