Finn Bark Blower BB-200 User manual

LBBB200-SE
Model BB-200
Parts and Operator’s Manual
Model SE Serial No. ___________
9281 LeSaint Drive • Fairfield, Ohio 45014
Phone [phone] • Fax [phone]
Sales: 1-800-543-7166

INDEX
SAFETY FIRST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
BARK BLOWER SAFETY SUMMARY SECTION . . . . . . . . . . . . . . . . . 2-5
Current Set of Safety Decals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
OPERATION AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
The FINN Bark Blower and Its Function . . . . . . . . . . . . . . . . . . . . . . . 6
How the Bark Blower Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Towing Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Selecting a Mulching Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Pre-Start Equipment Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety Check To Insure Operator Safety . . . . . . . . . . . . . . . . . . . . . . . 7
Starting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Crew Members and their Duties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
The Material Feed System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10
Subsystem 1: Material Handling Group. . . . . . . . . . . . . . . . . . . 8-9
Subsystem 2: Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . 9
A. Rotary Air Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
B. Feed Rolls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10
Subsystem 3: Hydraulic Control System . . . . . . . . . . . . . . . . . . . 10
Mulching with the Bark Blower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12
Electronic Timer Range Programming Instructions . . . . . . . . . . . 12-14
Select Mode of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-13
Select Time Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14
Cleaning and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-19
After First 4-8 Hours of Operation . . . . . . . . . . . . . . . . . . . . . 14-15
Weekly After Every 50 Hours of Operation . . . . . . . . . . . . . . 15-16
After First 100 Hours of Operation . . . . . . . . . . . . . . . . . . . . . . . 16
Every 3 Months or 3000 Miles (4,800 KM) . . . . . . . . . . . . . . . . . 17
Every 12 Months or 12000 Miles (19,300 KM) . . . . . . . . . . . . . . 17
Winter Shutdown and Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Lubrication Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-19
Continued

INDEX CONTINUED
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
PARTS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-45
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Pictorial Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Trailer and Carriage Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . 24-25
Axle and Hub Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Brake Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Airlock Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-29
Feeder Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-31
Hopper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-33
Drive Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-35
Blower Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-37
Hydraulic Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38-39
Engine and Control Box Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 40-41
Trailer Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Tool Kit, Discharge Hose and Recommended Spare Parts. . . . . . . . 43
Decal and Plate Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-45
WARRANTY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
WARRANTY REGISTRATION CARDS . . . . . . . . . . . . . . . . . . . . . . . 47-48

1
SAFETY FIRST
With any piece of equipment, new or used, the most
important part of its operation is SAFETY!
Finn Corporation encourages you and your employees to
familiarize yourselves with your new equipment and to
stress safe operation.
The first six pages of this manual are a summary of all the
main safety aspects associated with this unit. Be sure to
read completely before operation of machine.
This symbol is used throughout the operation
and maintenance sections of this manual to
call attention to safety procedures.
- Pay Attention -
DANGER: Immediate hazards which WILL result in severe personal injury
or death.
WARNING: Hazards or unsafe practices which COULD result in severe per-
sonal injury or death.
CAUTION: Hazards or unsafe practices which COULD result in minor per-
sonal injury or product or property damage.
IMPORTANT: Indicates that equipment or property damage could result if instruc-
tions are not followed.
NOTE: Gives helpful information.
Finn Corporation
CALIFORNIA
Proposition 65 Warning
The engine exhaust and some of its
constituents are known to the State
of California to cause cancer, birth
defects, and other reproductive harm.
CALIFORNIA
Proposition 65 Warning
Battery posts, terminals and related
accessories contain lead and lead
compounds, chemicals known to the
State of California to cause cancer
and reproductive harm. Wash hands
after handling.

2
BARK BLOWER SAFETY SUMMARY SECTION
It is important that all operators of this machine are familiar with all the safety aspects mentioned
below before operating the machine. Always keep a copy of this manual with the machine. It is the
responsibility of the operator of the machine to fully understand this safety section. Remember that YOU are
the key to safety. Good safety practices protect not only you but also the people working with and around
you. Keep in mind that this safety sheet is written for this type of machine only. Practice all other usual and
customary safe working precautions; and above all, remember that safety is up to you.
I. PRE-START EQUIPMENT CHECK (equipment
check is to be made with the engine off):
1. Check hitch and hitch
bolts, safety chains, lights,
brakes and breakaway
switch. Verify that the hitch
ball or pintle hook is the
correct size for the cou-
pler.
2. Verify that all guards are in
place.
3. By carefully looking into the blower hopper and tran-
sition, inspect for and remove any foreign objects.
Follow OSHA lockout/tagout procedure (29 CFR
1910.147)
4. Inspect all hydraulic hoses and tubes for cracks,
bulges or damage. If hose is bad, replace immedi-
ately.
5. Inspect the material discharge hose and connections
for cracks or damage. If damage is found, replace
affected part immediately.
II. MACHINE OPERATION:
1. Always wear safety gog-
gles when operating or
feeding the machine.
Other safety attire such
as safety shoes, ear pro-
tection, gloves, hard hats,
dust masks, etc., should
be worn as required
by warning decals on
machine, operator’s manuals, or job requirements.
Remove rings, watches, etc. Avoid loose fitting
clothing which may get caught in rotating machin-
ery.
2. Do not override or tamper with the safety shutdown
switches on the folding door or discharge. If switch-
es fail, use OSHA lockout/tagout procedure (29 CFR
1910.147) until switches are repaired or replaced.
3. Do not operate the machine
without all guards in place.
4. Never attempt to connect or disconnect the dis-
charge hose while the engine is running.
5. Make sure that no one is working in or on the
machine. Make sure the discharge area is clear of
all persons, animals, etc. Signal “All Clear” before
starting the engine. Keep unauthorized personnel
away from the machine and discharge hose at all
times.
6. The driver of the tow-
ing vehicle is responsi-
ble for the safety of the
operator(s) and feeder(s)
of the machine. Make sure
the driver is aware of and
avoids all possible haz-
ards, such as tree limbs,
low power lines, etc.
7. Do not allow anyone to ride on the trailer or any
other part of the blower for any reason.
8. Never operate machine in
an enclosed area without
venting the exhaust of both
the equipment and the tow
vehicle. Deadly carbon
monoxide fumes can accu-
mulate.
9. Never operate this or any other machinery when
fatigued, tired, under the influence of alcohol, ille-
gal drugs or medication. You must be in good
physical condition and mentally alert to operate this
machine.

3
10. Never modify the machine. Never remove any part
of the machine (except for service and then reinstall
before operating).
11. During application, high pressure can be exerted at
the end of the hose. Always establish and main-
tain good footing and hold the hose firmly. Extra
personnel may be required to help direct and hold
the hose, especially when working on slopes. The
proper technique for hose holding personnel is to
firmly grasp the hose under both arms. Never hold
the hose so it goes between the legs.
12. The blower discharges material at pressures and
velocities that can cause severe bodily injury. Do not
aim discharge at people, animals, etc. Only aim the
discharge at the intended discharge area. Unless
properly protected, do not place hand into the dis-
charge stream.
13. Do not open any doors
or access panels while
machine is in operation.
Severe injury may result
from rotating parts.
14. Do not attempt to pull
anything out of the blower
hopper when machine is
in operation. Shut down
the engine, using OSHA
lockout/tagout proce-
dure (29 CFR 1910.147)
before removing any for-
eign objects. Signal “All
Clear” before restarting
the machine.
15. When leaving the blower unattended for any reason,
be sure to:
A. Shut off conveyor drive.
B. Shut off vehicle engine and blower engine.
C. Place transmission of the vehicle in “neutral”
or “park”.
D. Set parking brake firmly.
E. Lock ignition and take keys with you.
F. Lock vehicle cab.
G. If on a steep grade, block the wheels.
These actions are recommended to avoid
unauthorized use, runaway, vandalism, theft
and unexpected operation when the equipment
is restarted.
16. Do not read, eat or otherwise lose or lessen your
attention in any manner while operating the blower.
Operating is a full time job.
17. Be careful in getting
on and off the blower,
especially in wet, icy,
snowy or muddy con-
ditions. Clean mud,
snow or ice from steps,
fenders and footwear.
18. All personnel operating and/or around the machine
must be aware that the blower can be controlled via
remote control. For safety reasons and to prevent
accidental starting, always keep the power switch on
the remote receiver in the “OFF” position when the
remote control is not being used.
20. Turn slowly and travel on rough surfaces and side
slopes carefully, especially with a loaded blower
body.
III. MAINTENANCE:
1. Before servicing the machine, turn off engine and
allow all moving parts
to stop. Disconnect the
battery cables to prevent
accidental starting of the
machine. Tag the engine
operating area to show
that the machine is being
serviced. Use lockout/
tagout procedure (29 CFR
1910.147).
2. Take extreme care when
adjusting or replacing
knives. Knife edge is
very sharp and can cause
severe bodily injury.
3. Radiator maintenance. Liquid cooling systems build
up pressure as the engine gets hot. Before remov-
ing the radiator cap, stop the engine and let the
system cool. Remove the radiator cap only after the
coolant is cool.
4. Battery maintenance. Lead-acid batteries contain
sulfuric acid which may damage eyes or skin on
contact. Always wear a face shield to avoid acid in
the eyes. If acid contacts eyes, flush immediately
with clean water and get medical attention. Wear
rubber gloves and protective clothing to keep acid
off skin. Lead-acid batteries produce flammable and
explosive gasses. Keep arcs, sparks, flames, and
lighted tobacco away.

4
5. Filling of fuel. Never fill the fuel tank with the engine
running, or while smoking or when near an open
flame. Never smoke while handling fuel or working
on the fuel system. The fumes in an empty container
are explosive. Never cut or weld on fuel lines, tanks,
or containers. Move at least 10 feet (3 meters) away
from fueling point before starting engine. Wipe off
any spilled fuel and let dry before starting engine.
NOTE: Be careful not to allow fuel, lubricant, hydrau-
lic fluid, or cooling fluids to penetrate into the ground
or be discharged into the water system. Collect all
used fluids and dispose of them properly.
6. It is recommended that only authorized genuine
FINN replacement parts be used on this machine.
7. Do not use ether cold start fluid if engine is equipped
with glow plug type preheater or other intake mani-
fold type preheater. It could cause an explosion or
fire and severe injury or death.
8. Diesel fuel or hydraulic fluid under pressure can pen-
etrate the skin or eyes and
cause injury, blindness or
death. To check for such
leaks, use a piece of card-
board or wood instead of
your hand. Pressure may
build up in the hydrau-
lic system so use caution
when removing the cap.
9. Some parts and assemblies are quite heavy. Before
attempting to unfasten any heavy part or assembly,
arrange to support it by means of a hoist, by blocking
or by use of an adequate arrangement to prevent it
from falling, tipping, swinging or moving in any man-
ner which may damage it or injure someone.
10. If repairs require use of a torch or electric welder, be
sure that all flammable and combustible materials
are removed. Fuel or oil reservoirs must be emptied,
steam cleaned and filled with clean water before
any cutting or welding on them is attempted. Do
NOT weld or cut on any tank containing oil, gasoline
or their fumes or other flammable material, or any
container whose contents or previous contents are
unknown.

5
CURRENT SET OF SAFETY DECALS
P/N55219SEVERHAZARD!Keephandsandfeetout!Sharpkniveswillsever.Failuretocomplywillresultindeathorseriousinjury.DANGER
P/N55280WARNINGFLYINGOBJECTS!STAYBACK!Stayawayfromdischargeareaduringoperation.Keepbystandersaway.DONOTpointdischargetowardpeople,animalsorproperty.ALWAYSwearappropriateprotectivegear.Failuretocomplycouldresultindeathorseriousinjury.
Do not operate
without guards in
place.
P/N-12179
WARNING

P/N-22357
Turn engine off,
disconnect battery,
and allow all moving
parts to stop before
servicing equipment.
WARNING
P/N12278BURNHAZARD!Hotexhaust!Stayback!Failuretocomplycouldresultindeathorseriousinjury.WARNING
P/N-23423
BREAKAWAY SWITCH
Do not use for parking.
Attach cable to towing
vehicle with slack for
turning. Engine battery on
trailer must be charged
and hooked up for proper
breakaway function.
WARNING
P/N55735WARNINGCONTENTSUNDERHIGHPRESSURE!Topreventinjuryordeath:-Turnoffenginetorelieveairpressureonsystembeforeuncouplinganyhosesorlooseninganyclamps.-Wearpropereyeandhandprotectionwhenoperatingequipment.-Keepallhoses,couplingsandclampsingoodcondition.Failuretocomplycouldresultindeathorseriousinjury.
P/N-31228
Both the single and double chains must be crossed
under the tongue. They must be oriented in such a
manner as to prevent the tongue from dropping to
the ground in the event of failure to the hitch,
coupler or ball. The Chains must be connected to
the towing vehicle so that the slack for each length
of chain, between the trailer and the towing vehicle,
is the same and must have no more slack when in
use than is necessary to permit proper turning of
the vehicles. The forward end of the chain must be
attached to the towing vehicle, not to the ball, but
to the hitch or other frame member. The chain must
be looped around the member and hooked back
into itself.
SAFETY CHAIN INSTALLATION
P/N-31227
Always inspect tow
vehicle and equipment
hitch before towing.
Tighten all hitch
bolts and properly
connect wiring and
saftey chains.

6
OPERATION AND MAINTENANCE
OF THE
FINN MODEL BB-200 BARK BLOWER
THE FINN BB-200 BARK BLOWER AND ITS FUNCTION:
The FINN Model BB-200 Bark Blower is an apparatus for conveying and discharging bulk materials, such
as bark mulch, at a fast and uniform rate utilizing a minimum amount of manpower. The product to be used
is generally composted and processed and used as a soil amendment, a ground cover for erosion and weed
control, or for decorative purposes on landscaping (bark mulch).
This manual is intended to provide step-by-step instructions on the operation, care, and maintenance of
the Bark Blower. In addition, it contains illustrations and a complete list of parts and components for easy
identification.
HOW THE BARK BLOWER WORKS:
The bulk material is loaded into the hopper. Located at the bottom of the hopper are two feed rolls. The
feed rolls feed the bulk material into a rotary air valve. The rotary air valve is specifically designed and built
to handle tough, fibrous material. The function of the rotary air valve is to take the bulk material into open
pockets exposed to the outside air and to convey it to an area where the pocket is closed off. At that point
a high-pressure air stream, created by the blower, is channeled through the pocket carrying the material off
and through the hose for discharge.
IMPORTANT: For best results and to insure safe operation and long life of the
equipment, please read and follow all instructions carefully.
TOWING VEHICLE:
The truck used to tow the FINN Model BB-200 Bark Blower must be equipped with the appropriate ball
or pintle type hitch. This hitch should be mounted as near to the end of the truck bed as possible. The tow
vehicle should be fully wired for trailer marker, turn, and stop lights as well as electric brakes.
SELECTING A MULCHING MATERIAL:
Several factors must be considered when selecting material to convey through the Bark Blower. The variety
of the wood used, how it is processed, its moisture content, and the presence of foreign objects all effect the
ability of the Bark Blower to convey the mulch at a uniform and acceptable rate.

7
The mulch material must be processed and/or screened so that a minimum of material is over 2 inches (5.1
cm) in any direction with no material exceeding 3 inches (7.62 cm) in length. The Bark Blower is not a wood
processor. It only reduces mulch fibers when they protrude above the rotary air valve vanes. As the vanes
rotate past the knife, the protruding fibers are sheared off. If the mulch contains long or large fibers, and if
the wood fibers are harder to cut, then the machine’s throughput is reduced. For example, if two mulches
have the same mix of material sizes that the Bark Blower rotor must cut, but one is softwood like pine, and
one is hardwood such as oak, the pine would go through at a higher rate because it is easier to cut.
Two characteristics must be considered when selecting a material: the “greenness” of the wood and the
moisture of the mulch as a whole. Wood that is well seasoned is easier to cut then “green” wood. It also
processes better, making a less stringy mulch. High moisture in the mulch may cause it to bridge in the
hopper.
Avoid using mulches that contain any hard foreign objects such as rocks, nails, steel, cans, glass, etc. These
objects could cause bodily injury as well as damage to machine components, especially the cutting knife in
the rotary air valve.
PRE-START EQUIPMENT CHECK:
CAUTION: Equipment check is made with the engine off and all rotating
parts stopped.
SAFETY CHECK TO INSURE OPERATOR SAFETY:
1. Check all trailer connections to the towing vehicle, as well as the condition of the safety chains, and
bolts connecting the ball coupler or pintle eye to the tongue.
2. Insure that all guards are in place.
3. Tool Kit - see that it contains all prescribed items (see tool kit list, page 43).
4. Lubrication Equipment - use hand gun only (see lube chart, pages 18-19).
5. Check engine oil - refer to engine operator’s manual.
6. Check fuel level. Check engine oil level . . . for oil type refer to the engine manual.
7. Inspect the engine air cleaner (refer to the engine operator’s manual) and the blower air cleaner for
dust and dirt.
9. Check hopper and transition for foreign objects that could injure workers, or damage equipment.
10. Check the fluid level in the hydraulic tank. Proper level is when the sight gauge is full to the upper
black line when unit is sitting on level ground. (See “Subsection 2: Hydraulic System” page 9 for
oil specification).
11. Install the discharge hose. Use clamps provided with the machine.

8
CAUTION: Do not use radiator type clamps. These clamps may not hold
under machine operating pressure.
STARTING PROCEDURE:
CAUTION: See safety section of the manual (pages 2-5) before operating
the machine.
1. Set throttle about 1/4 open.
2. Pull Choke Control out.
3. Turn the key clockwise until the starter catches and engine fires.
4. Push the Choke Control in for even running.
5. Verify that the “DOOR SWITCH” light is illuminated. If not, verify that the door is closed at the
rotary air valve.
6. Allow the engine to warm up for three to five minutes.
7. Prior to mulch application, move the throttle position to fully open, and allow the governor to con-
trol the engine speed. Governed engine speed on the FINN Bark Blower should be 3300 to 3600
RPM under load.
CREW MEMBERS AND THEIR DUTIES:
1. The Operator controls the placement of the mulch by moving and aiming the discharge hose.
2. The Loader(s) feed material to the machine by shoveling from the tow vehicle to the hopper.
THE MATERIAL FEED SYSTEM:
The material feed system on the Bark Blower has been designed to give fast, uniform, mechanical feed-
ing. The adjustable feeding rate and the automatic reverse control system allow the use of varied materials
while obtaining maximum production. The system is an integration of the following three subsystems, all of
which contribute to efficient material flow:
SUBSYSTEM 1: MATERIAL HANDLING GROUP
The three major components of the material handling group are the Blower, the Feed Rolls, and the Rotary
Air Valve.
The Blower is a rotary lobe, positive displacement type unit having two double lobe impellers. It is driven
off the engine by a drive belt; therefore whenever the engine is running, air is being pumped. The blower is
equipped with an inlet and outlet silencer for noise attenuation, and an inlet air filter.

9
The Feed Rolls receive material from the hopper and meters it to the Rotary Air Valve. They insure a uni-
form feed of bulk material to the Rotary Air Valve, and are powered by a variable speed hydraulic motor
connected together by a chain drive.
The Rotary Air Valve receives the material from the Feed Rolls and pressurized air from the Blower. Its pri-
mary function is to convey the material from the atmospheric air to a sealed chamber where the Blower air
picks it up and blows it out of the hose. To enable the Bark Blower to convey fibrous material, the rotary air
valve housing is equipped with a cutting knife, and the vanes on the rotor are angled and hardened. If any
long material should protrude above a vane, it will be sheared off, before the vane enters the close tolerance
of the housing, by a scissor like action between the vane and cutting knife. The rotor of the Rotary Air Valve
is direct coupled and driven by a bi-rotational hydraulic motor.
SUBSYSTEM 2: HYDRAULIC SYSTEM
Hydraulic power for the Bark Blower is generated by a fixed displacement hydraulic pump driven off of
the engine. The pump receives AW46 hydraulic fluid from the 5 gallon (19 liter) reservoir through a suc-
tion hose, and delivers it to the solenoid control valves. Pressure driving the two hydraulic circuits can be
monitored on the gauges provided.
A. ROTARY AIR VALVE
The pump feeds oil to the rotary air valve motor through a solenoid valve. The solenoid valve is an open
center spool valve with built in relief set at 2100 psi (14500 kPa). The spool in the valve is spring centered,
and is moved by actuating a 12V DC solenoid on either end of the spool. Spool movement can be checked
manually by pushing the button located at either end. Energizing a solenoid produces high-pressure oil at
the work port away from that solenoid. Thus, energizing the top solenoid on the valve channels oil from
the pump to the bottom work port on the valve. This is “forward” position on the rotary air valve motor.
Energizing the bottom solenoid produces “reverse” rotation on the rotary air valve motor.
B. FEED ROLLS
Oil leaving the rotary air valve circuit feeds to the feed roll motor through a “dump” valve system. The
feed roll speed control valve, located on the top of the valve mounting plate is actually three valves in one
manifold; a relief valve set at 1850 psi (12800 kPa) to protect this circuit, a 12 VDC normally open solenoid
“dump” valve, and a flow control valve.
Oil entering this manifold flows back to the tank. Energizing the solenoid valve forces oil through the
flow control valve where a certain amount flows to the feed roll hydraulic motor causing the roll to rotate.
Turning the adjustment knob on top of the valve increases or decreases the amount of oil going to the feed
roll motor, and thus the speed. The two feed rolls are connected by a chain drive. Before entering the feed
roll drive motor, the oil passes through a manual reversing valve. If the rolls become stalled, pushing the
knob on this valve towards the hopper will cause the rolls to reverse. The rolls will return to forward rota-
tion as soon as the valve knob is released. Please note that this valve will only operate if the electric control
system for the valve is "ON".

10
Figure 1 - Flow Control Valve
SUBSYSTEM 3: HYDRAULIC CONTROL SYSTEM
The hydraulic control system is an electrical system that controls the on-off function of the feed roll motor
and the rotation direction of the rotary air valve motor. This 12-volt DC system runs off the engine electrical
system. It is a series of relays, located in the control box that controls the solenoid valves in the hydraulic
system.
When the material hopper switch is placed in the "ON" position (provided the door switch light is illumin-
sted), power is sent through the TR1 timer to activate the "forward" solenoid on the rotary air valve circuit.
Power is also sent to the TD1 relay. After TD1 times out, power is sent to the feed roll valve. As material
drops into the top of the rotary air valve, the pressure to turn the rotary air valve varies. If the pressure
reaches the relief valve setting in the solenoid control valve, the oil is channeled through the relief to the
hydraulic tank. Placed in the forward work line is a normally open pressure switch. When the pressure in
the work line exceeds the pressure switch setting, the switch then closes and activates timer TR1.
TR1 automatically reverses the rotary air valve for the set time on the timer (approximately 1 second).
While in reverse, it also cuts power to the feed rolls, shutting them off. At the end of TR1’s set time, power
is restored to the “forward” solenoid putting the rotary air valve back into forward. Power is also restored
to the time delay TD1.
TD1 is the time delay for the feed rolls. This delay keeps material from feeding into the rotary air valve
until the set time (approximately 1.5 seconds) has passed coming out of auto-reverse. In the case of multiple
auto-reverses, it keeps the transition area above the rotary air valve clear of any new material.
When the material hopper switch is placed in the "OFF" position, power is cut to the relays. This stops the
hydraulic motor on the feed rolls and the rotary air valve by shutting off power to the solenoids. Shutting
off the ignition key can also stop the hydraulics. Please note that the hydraulics will also stop if the transi-
tion door, between the feed rolls and the rotary air valve, is opened and cannot be restarted unless the door
is closed.
Black Cartridge with 1" (25mm) Diameter Knob:
Turn Counter-Clockwise to Increase Speed.
Turn Clockwise to Decrease Speed.
Increase
Decrease

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MULCHING WITH THE BARK BLOWER:
1. Check all areas listed under “Pre-Start Equipment Check” (pages 7).
2. Start the engine following all the steps listed under “Starting Procedure” (page 8).
3. Set the floor speed control to ½ to 1 turn from minimum.
4. Increase the throttle to full.
5. With a firm grip on the end of the hose, place the material hopper switch in the “on” position.
6. Adjust the feed roll speed for smooth flow. Watch for auto-reversing of the air lock as well as shock
waves through the hose.
7. At the end of the load, switch the material hopper switch to "off" and shut down engine.
NOTE: Laboring of the engine indicates excessive feed roll speed.
TROUBLE SHOOTING CHART:
Symptom Probable Cause Remedy
No material discharge. Feed Rolls not turning. Turn material hopper
switch on. Reset speed
control. Momentarily
reverse feed rolls.
Electrical control system off. Check door light/switch.
Reverse interval too long. Reset time (1 sec.)
on TR1.
Feed roll jammed. Clear jam, reset speed
control.
Air valve auto-reverses Feed rate too high. Slow speed control.
excessively.
Dull air valve knife. Sharpen and reset
knife.
Poor material. Change material.
TD1 time set too low. Reset timer (1.5 sec.)
Air valve motor stalls Over-feeding. Slow speed control.
in reverse, cycling
forward-reverse. Foreign object in transition Shut-off engine and
or hose outlet. remove object.

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TROUBLE SHOOTING CHART CONT'D:
Symptom Probable Cause Remedy
Air valve motor stalls Reverse time interval too Reset timer (1 sec.)
in forward, no auto short. (TR1)
reverse.
Knives dulled or chipped: Sharpen blades,
Knife clearance too large. reset knife clearance.
Relief pressure on solenoid Reset to 2100 psi.
valve is set too low.
Feed roll stops. Speed control set too low. Reset speed control ½-1
turns from minimum.
Foreign object in material. Stop engine-remove
object.
Relief too low on roll. Reset relief to 1850 psi.
ELECTRONIC TIMER RANGE PROGRAMING INSTRUCTIONS
The following instructions present all of the
necessary steps to program the Electronic
Timer. Turn selectors securely with use of a
flat screwdriver (4mm maximum wide blade).
Note that an incomplete setting may cause a
malfunction. Be careful to not turn the selec-
tors beyond their limits. Since changing a
setting during timer operation may cause a
malfunction, always turn off the power before
changing any settings.
SELECT MODE OF OPERATION
Select the operation mode by turning the selector with use of a flat screwdriver (4mm wide maximum)
until the appropriate node designation appears in the window directly above the selector. See Figure 3.
Figure 2 - Electronic Timer

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SELECT THE TIME RANGE
Select the time range by turning the scale selector
until the appropriate dial settings appear on the timer
faceplate. Refer to Figure 4.
Next, turn the range selector until the appropriate
range designator appears in the window directly
above the selector. Refer to Figure 5.
SELECTOR
A = Delay
B = Interval
C = Not Used
D = Not Used FLAT
SCREWDRIVER
ELECTRONIC TIMER
MODE
DESIGNATOR
Figure 3 - Set Mode of Operation
DIAL SETTINGS
SCALE SELECTOR
Figure 4 - Scale Setting

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CLEANING AND MAINTENANCE:
CAUTION: Turn off engine and disconnect battery before servicing equip-
ment.
AFTER FIRST 4-8 HOURS OF OPERATION:
1. Check and adjust belt. Proper tension is obtained when 5/8" (1.6 cm) of belt deflection is obtained
at the center of the belt span when a force of 8 lbs (3.6 kg) for a used belt to 10 lbs (4.5 kg) for a new
belt is applied.
RANGE
DESIGNATOR
FLAT
SCREWDRIVER
RANGE
SELECTOR
ELECTRONIC TIMER
Range DIAL SETTINGS
Designator 0-1 0-3 0-10 0-30 0-60
S 0.1 Sec. - 1 Sec. 0.1 Sec. - 3 Sec. 0.2 Sec. - 10 Sec. 0.6 Sec. - 30 Sec. 1.2 Sec. - 60 Sec.
min 1.2 Sec. - 1 Min. 3.6 Sec. - 30 Min. 12 Sec. - 10 Min. 3.6 Sec. - 30 Min. 1.2 Min - 60 Min.
h 1.2 Min. - 1 Hr. 3.6 Min. - 3 Hr. 12 Min. - 10 Hr. 3.6 Min. - 30 Hr. 1.2 Hr. - 60 Hr.
10h 12 Min. - 10 Hr. 36 Min. - 30 Hr.. 2 Hr. - 100 Hr. 6 Hr. - 30 Hr. 12 Hr. - 600 Hr.
Figure 5 - Set Range
NOTE: Refer to Page 40 for the Engine and Control Box Wiring Diagram
and specific factory settings for the Electronic Timer.

15
2. Retorque wheel lugs 85-98 ft. lbs. (12-13 kg-m) after 7 days. (Trailer option only).
3. Change the engine oil and filter.
CAUTION: Adjust only while the engine is off.
WEEKLY - AFTER EVERY 50 HOURS OF OPERATION:
1. Lubricate the bearings on the blower and on each end of the feed roll shaft. Wipe each bearing
before lubrication to remove dirt and prevent overheating.
2. Remove and clean air cleaner elements on the engine and blower using dry, clean compressed air.
3. Check the oil in the rotary air valve gearbox.
4. Check the gear case on the blower (see Lube Chart on pages 18 and 19).
5. Check rotary air valve knife for wear, chips, and clearance. To change:
DANGER: Knives have very sharp edges that can cause serious injury.
Handle with care.
a) Remove five bolts holding knife and transition door to rotary air valve knife shelf.
b) Remove door and knife.
c) Clean all dirt or debris from shelf.
d) Back out the two center jacking screws on the shelf.
e) Compare replacement knife to the one removed. If the new knife is wider, back the two
outside jacking screws out at least this amount. Count the turns, and back both screws out
evenly.
f) Lay the knife on the knife shelf. Insure the knife is installed with the cutting angle edge fac-
ing down as shown in Figure 6. Install loosely the two outer, and the middle knife mounting
bolts. Tighten the mounting bolts just enough to hold the knife in position while still allow-
ing it to be moved.
g) Install a block of wood (approximately 2” x 4” x 6” long (5x10x15 cm)) in between the knife
and the closest vane at the center of the rotor length. Pinch the wood between the knife and
the vane by turning the rotor shaft with a pipe wrench.
h) While keeping pressure on the knife, tighten the three mounting bolts.

16
i) Remove the wood block, and check the clearance between the knife and the rotor vane using
a feeler gauge at the three mounting bolts.
NOTE: If the knife touches the vane at any point, loosen the three mounting
bolts, back off the jacking screws evenly, and repeat steps g, h, and
i until clearance is obtained.
j) Loosen the three mounting bolts, and use the jacking screws to close the gap. One full turn
of the screw moves the knife 0.070 inches (1.8 mm).
k) Tighten mounting bolts as in step g and h.
l) Repeat steps, g, h, i, and j until a knife to vane clearance of no more than 0.006 inches (0.15
mm) is obtained at the closest point(s).
m) Once set, install the other two mounting bolts and tighten.
n) Run two center jacking screws in to contact the knife. Lock all jacking screws in place with
the jam nuts.
o) Remove three mounting bolts for transition door, and install the door.
p) Immediately have removed knife sharpened. Do not attempt to grind the knife by hand.
They must be ground straight and true on a surface grinder by an experienced knife sharp-
ener. Grind the knife to the profile shown below in Figure 6.
Figure 6 - Knife Profile
When dimension “A” has been reduced to 2- 3/8 inches (6 cm) the knife must be discarded.
AFTER FIRST 100 HOURS OF OPERATION:
1. Change engine oil and filter after 100 hours, every 250 hours after that following engine manufactur-
er’s recommendations.
2. Change the gear box oil on the blower, use Mobil SHC 630 synthetic oil only. Change oil every
1000 hours thereafter.
3. Change the gearbox oil on the rotary air valve using SAE 80W90 oil, filling to the side plug. Change
every 1000 hours thereafter.
"A" 3/8"
(.95 cm)
59°
48° Max.
5/8" (1.6 cm)
27/64" (1.07 cm)
Min.