Barreto E622GT Owner's manual

622GT Owner’s/Operator’s Manual
8/29/18
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THE
MODEL E622GT
HYDRAULIC FRONT TINE TILLER
OWNER’S/OPERATOR’S MANUAL
CONGRATULATIONS!
You are now the proud owner of the BARRETO Model E622GT tiller. Please take a moment of your time to
look over the following information. Familiarize yourself with the tiller, its characteristics, and method of
operation. Pay particular attention to the safety and operating instructions.
If you have any questions or need any replacement parts in the future, please contact us at your
convenience. Our toll-free phone number, fax and email are listed below and parts may be ordered through
any of these methods.
THANK YOU for your patronage and confidence in BARRETO equipment.
Barreto Manufacturing, Inc.
Innovative Equipment Engineered to Last
66498 Hwy 203, La Grande, OR 97850
[phone] [phone]
FAX [phone]
E-Mail: [e-mail]
Web Site: http://www.barretomfg.com
Machine Identification Record
Barreto Customer number ________________________
Machine model number ________________________
Machine serial number ________________________
Engine manufacturer ________________________
Engine model number ________________________
Engine serial number ________________________

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TABLE OF CONTENTS
TILLER ASSEMBLY INSTRUCTIONS 2
SERVICE INFORMATION 3
BARRETO WARRANTY 3
HOUR METER 4
HONDA GX160 SCHEMATIC 5
SUBARU EX17 SCHEMATIC 6
HYDRAULIC SCHEMATIC 7
SPECIFICATIONS 8
TROUBLESHOOTING 9
OPERATING INSTRUCTIONS 10
ENGINE CONTROLS 11
SAFETY INSTRUCTIONS 12
SAFETY INSTRUCTIONS OVERVIEW 13
LOCATING UNDERGROUND UTILITIES 15
WORKSITE ASSESSMENT 15
CONTACT WITH UNDERGROUND UTILITIES 16
ASSEMBLY
INSTRUCTIONS
1. Remove the tiller from shipping crate. Please inspect immediately for any damage and
notify the shipping company and Barreto Manufacturing, Inc. right away if any is found.
2. Check reservoir according to instructions in service information on the following page.
3. Fill the engine with fuel and oil according to the engine manual.
4. When documentation refers to “right side” or “left side”, it is relative to the operator’s
position with both hands on the handlebars.

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SERVICE INFORMATION
1. Check the reservoir level using the sight glass on the top of the tank. If required, add to reservoir
with tractor transmission hydraulic oil (AW or ISO rating of 68 is recommended). Recheck oil level
after the tiller has been run and oil has been circulated through the tine motor. Routinely check
level thereafter. DO NOT OVERFILL THE TANK.
2. Change the hydraulic oil filter after the first 50 hours of use. Change it after every 200 hours
thereafter.
3. Check the tine bolts after each use and tighten as needed. Check all hydraulic fittings for leaks
and tighten if necessary.
4. Tines should be changed as often as needed for the machine to do a satisfactory and efficient tilling
job. Use Loctite stud and bearing adhesive/sealant on tine bolt threads to prevent loosening.
5. The grease zerk on the end of the tine frame should be greased after every 4 to 8 hours of use.
6. The grease zerks on the wheels should be greased monthly.
IMPORTANT: The engine is normally serviced prior to shipping. However, shipping regulations
may prohibit this. Check levels and add oil and fuel as required before starting. Service according to
the engine manual before starting.
IMPORTANT: If the couplers between the engine and the pump are moved or removed for
any reason, it is CRITICAL that they have a 1/16” gap between them when reinstalled. Failure
to have this gap will result in rapid wear and failure of your pump!
NOTE: It is very important to move the fuel shutoff lever to the closed position after
stopping the engine. Failure to do so could cause fuel to leak down into the cylinder and
crankcase. Damage resulting from this will void your engine warranty and not be covered.
WARNING: Running the tiller without hydraulic oil will cause serious damage to the hydraulic pump.
CHECK RESERVOIR LEVEL BEFORE STARTING THE MACHINE.
BARRETO MANUFACTURING, INC. EQUIPMENT WARRANTY
Barreto Manufacturing, Inc. warrants all BARRETO equipment to be free of defects in material and
workmanship for a period of one (1) year, dating from delivery to the original user.
This Warranty is in lieu of all other warranties, whether written or implied, and is limited to:
1. Replacement of parts returned to the dealer and/or factory and determined defective upon
inspection. (Replacement for parts to dealers shall be at dealer cost plus shipping charges.)
2. Time for pick-up and/or delivery, transportation or service calls by dealers is excluded.
Manufacturer reserves the right to determine reasonable time required for repair.
Warranty does not apply to damage caused by abuse or neglect. Time and materials required for normal
maintenance and service are also excluded from warranty coverage.
Engines, engine accessories, batteries and tires are warranted by the original manufacturers and
are not covered by the Barreto Equipment Warranty. Wear parts such as tiller tines, sprockets,
bearings, trencher chain parts including teeth, stump grinder cutting teeth & holders, etc. are also
excluded unless it can be determined that a defect has contributed to premature wear.

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8/29/18
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HOUR METER
The DGI®TACH/HOUR hour meter tracks the hours of machine operation in order for routine
maintenance to be performed on a timely basis.
Your DGI® hour meter is pre-set at the DGI® factory to go into Flash Alert mode at 25-hour intervals.
Although the engine manufacturer does not require changing engine oil this often, due to heavy-duty use
and extreme conditions inherent to tiller use, Barreto Manufacturing strongly recommends
frequent oil changes.
Refer to this manual for equipment service requirements and to the Engine Manual for engine service
requirements.
While Flash Alert is active, hold the tip of the RESET TOOL (Key Kancel Wand) against the meter as
shown. Within several seconds, the display will stop flashing indicating the Service Interval has been
reset. If the wand gets lost, a small mechanic’s pick-up magnet will work.
RESET TOOL

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8/29/18
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ELECTRICAL SCHEMATIC - HONDA GX160

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8/29/18
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ELECTRICAL SCHEMATIC - SUBARU EX17D

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8/29/18
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HYDRAULIC SCHEMATIC

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8/29/18
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SPECIFICATIONS
MODEL NUMBER 622GT
DIMENSIONS
Weight 211 lbs. (95.71kg)
Height 50” (1.27m)
Length 59” (1.5m)
Width 28” (71.12cm)
ENGINE
Engine Honda GX 160
Optional engine Subaru EX 17D
FUEL Gasoline
POWER: hp (kW) at 3600 RPM H-5.5 hp (4.0kW)
POWER: hp (kW) at 4000 RPM S-5.7 hp (4.2kW)
FUEL CAPACITY H-0.95 U.S. gallons (3.6 liters)
R-0.94 U.S. gallons (3.6 liters)
ENGINE OIL CAPACITY H-.63 quart (.60 liters)
R-.63 quart (.60 liters)
HOUR METER Standard
HYDRAULIC SYSTEM
Reservoir Capacity 1.4 U.S. gallons (5.3 liters)
Oil Cooler Standard
Hydraulic pump output 4 gpm (15.14 liters)

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8/29/18
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622GT TILLER TROUBLE SHOOTING GUIDE
CAUTION: ALWAYS USE EXTREME CARE WHEN TROUBLE SHOOTING OR MAKING
ADJUSTMENTS ON THE TILLER. STAY CLEAR OF TINES WHEN ENGINE IS
RUNNING. ALWAYS SHUT THE ENGINE OFF BEFORE DISASSEMBLING ANY
COMPONENT.
A. ENTIRE HYDRAULIC SYSTEM DOES NOT OPERATE AND THE ENGINE IS NOT
UNDER LOAD
1. Low hydraulic oil in tank.
2. Hydraulic pump-to-engine coupler has
slipped.
Fill to center of sight glass.
Check for wear and replace both coupler
halves and rubber spider as needed.
B. TINES FAIL TO ROTATE
1. Tine motor worn.
Rebuild or replace motor. New motors are
available from Barreto Manufacturing, Inc.
C. ENGINE LUGS DOWN OR DIES AND TINES DO NOT TURN.
1. Rocks or other obstruction blocking tines.
2. Tine shaft bound with wire, vines, or
grass.
3. Outboard tine shaft bearings binding.
4. Engine improperly tuned or maintained.
5. Low oil alert causes engine to shut down.
6. Engine losing power due to wear.
D. OIL LEAKS IN HYDRAULIC SYSTEM.
1. Fittings are loose.
2. Worn or broken hoses.
Shut OFF engine and remove obstruction or
reverse tines.
Shut OFF engine and remove debris,
especially at the ends.
Lubricate or replace bearings as needed.
See engine manual and correct as needed.
This may occur if tilling on hills, (not
advised). Level the tiller and check engine oil
level. Fill if required. Oil alert should reset.
See engine manual.
See engine manual.
Tighten as required.
Replace as necessary.

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TROUBLE SHOOTING GUIDE (continued)
E. EXCESSIVE FOAMING OF HYDRAULIC OIL FROM VENT HOSE.
1. Improper oil used.
2. Pump sucking air.
Verify that hydraulic oil used has anti-
foaming additives. *
Inspect and tighten fittings on intake side of
pump.
OPERATING INSTRUCTIONS
1. READ SAFETY
INSTRUCTIONS BEFORE O PER A T I N G !
2. Be sure engine oil and hydraulic oil are at proper levels before starting the tiller.
3. STUDY AND UNDERSTAND
CONTROLS BEFORE BEGINNING
O PER A T I O N!
4. OPERATE TILLER ON LEVEL GROUND ONLY!
5. VALVE LEVER activates tines when squeezed. Tines stop when the lever is released.
6. CAUTION!! Tines reverse at a reduced speed when the VALVE LEVER is pushed
forward. This should ONLY be done to dislodge an obstruction or back out of a corner.
7. Adjust handlebar to a comfortable position.
8. Wheels and drag bar can be adjusted to control speed and tilling depth.

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ENGINE CONTROLS
CHOKE: Use to aid starting the engine when it is cold.
IGNITION SWITCH: There are two ignition switches. One switch is located on the control panel for
your convenience. The other is located on the engine. Use these to start and stop the engine.
THROTTLE: Use this to adjust engine speed.
FUEL SHUT-OFF: Use this when starting or stopping machine.
FUEL SHUTOFF THROTTLE
CHOKE IGNITION
FUEL SHUT-OFF THROTTLE

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SAFETY INSTRUCTIONS
1. READ SAFETY AND OPERATING INSTRUCTIONS BEFORE OPERATING!
2. DO NOT LEAVE TILLER UNATTENDED WITH ENGINE RUNNING.
3. Always park on level surface, never on an incline.
4. USE EXTREME CAUTION IF TRANSPORTING TILLER DOWN ANY INCLINE,
ESPECIALLY IF USING RAMPS OFF A PICK-UP TR U C K .
5. The VALVE LEVER on the left handlebar is for operator protection. DO NOT TAPE
DOWN OR OTHERWISE BY-PASS THIS SAFETY FEATURE!
6. Objects may become airborne while operating tiller. Wear safety goggles, hard hat, protective
footwear and hearing protection while operating or observing!
7. Rotating tines can cause serious injury. KEEP HANDS AND FEET CLEAR!
8. KEEP MACHINE LEVEL while tines are operating.
9. Buried cables or gas lines can cause serious injury or death. Contact local agencies for location.
10. Fuel exhaust and fuel fumes can cause illness or death. Operate outdoors and avoid breathing
exhaust and fumes.
11. Fuel-fumes can catch fire or explode. Do not smoke or operate near flames or sparks.
12. Hydraulic oil is under extreme pressure and can get under skin and burn or poison.
Check for leaks with cardboard.
13. Muffler and engine get hot enough to cause serious burns. Do not touch until cool.

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SAFETY INSTRUCTIONS OVERVIEW
USE COMMON SENSE AND PLENTY OF IT!
The VALVE LEVER on the left handlebar is for the operator’s protection. All motion stops when the
lever is released. DO NOT TAPE THE VALVE LEVER UP or otherwise by-pass this safety feature!
Call before you dig. If you do not call, you may cause an accident; suffer injuries or death; cause
interruption of services; damage the environment; and/or incur project delays. Expect to be held liable for
any damages caused, if you fail to call.
DANGER: Buried electric cables or gas lines can cause serious injury or death if struck with
tines. Always determine location of utilities before tilling.
WARNING: Fiber optic cables convey laser light that can injure your
eyesight.
STAY CLEAR of moving parts on the tiller.
Wear safety goggles and a hard hat while operating or observing!
WARNING: The tines may throw stones and debris.
Wear adequate hearing protection while operating or observing.
WARNING: Exposure to loud noise is cumulative and may
permanently damage your hearing.
Wear safety boots and gloves. Wear close-fitting clothing. Contain long
hair. Do not wear jewelry. Wear reflective clothing if working near
traffic.
Only operate outdoors and avoid breathing engine exhaust and fumes.
WARNING: Engine exhaust contains carbon monoxide gas that is toxic.
Breathing it can cause unconsciousness and death.
Adequate lighting is required, daylight or artificial, for safe operation of the tiller.
Allow adequate side and overhead clearances between tiller and buildings, fences, and trees.
WARNING: Contact with the tines while in operation will cause serious injury or even death.
Keep away from tires to avoid getting crushed.
WARNING: Getting run over by the tiller will cause injury.
Always leave tiller parked on a level surface.
WARNING: Do not park on incline. Move the tiller to a level surface.
Do not leave tiller unattended with the engine running.

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SAFETY INSTRUCTIONS OVERVIEW (continued)
Avoid inclines if at all possible.
WARNING: Navigating on any incline increases the danger of the tiller losing traction or rolling
over, especially if the surface is wet. If you lose control, get out of the way immediately to avoid
personal injury. Navigation on inclines should be especially slow and turns very gradual.
A 20° maximum incline is allowed. Honda engines have an Oil Alert system that will automatically stop
the engine if tipped more than 20°.
Do not operate tiller near any source of flammable dust or vapors.
WARNING: Sparks from the engine exhaust can cause an explosion or fire in a flammable or
explosive atmosphere. Fuel fumes can catch fire or explode.
Do not operate tiller near flames or sparks.
WARNING: Fuel fumes can catch fire or explode.
Shut off engine and allow it to cool before refueling.
WARNING: Fuel fumes can catch fire or explode. Do not smoke when refueling. Do not refuel
near a source of flames or sparks.
Do not touch the engine, muffler, or any of the hydraulic components until cool.
WARNING: Muffler and engine get hot enough to cause serious burns. For the safety of yourself
and others, allow enough time for the engine, muffler, and the hydraulic fluid to cool completely
before performing any cleaning or maintenance.
Avoid contact with hydraulic fluid.
WARNING: When machine is operating, hydraulic fluid is under extreme pressure and can get
under skin and burn or poison.
Keep others away. If the job site is near a road or pedestrian path, warn and divert both motorized traffic
and pedestrians. As appropriate, use traffic flag personnel, signs, cones, and lighting devices to insure
safety.
Never allow anybody to ride on the tiller.
Never lift the tiller over any person at any time.
WARNING: If tiller should fall it would crush anybody under it.
We recommend having a fire extinguisher suitable for petrol fires in the operating area.

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DETERMINE LOCATION OF UNDERGROUND UTILITIES
OSHA CFR 29 1926.651 requires that the estimated location of underground utilities be determined
before beginning excavation or an underground drilling operation. When the actual excavation or bore
approaches an estimated utility location, the exact location of the underground installation must be
determined by a safe, acceptable and dependable method. If any utility cannot be precisely located, the
appropriate utility company must shut it off.
Call before you dig. If you do not call, you may cause an accident; suffer injuries or death; cause
interruption of services; damage the environment; and/or incur project delays. Expect to be held liable for
any damages caused, if you fail to call.
DANGER: Buried electric cables or gas lines can cause serious injury or death if struck with tiller
tines. Always determine location of utilities before tilling.
WARNING: Fiber optic cables convey laser light that can injure your eyesight.
CALL 811 TO LOCATE UTILITIES BEFORE TILLING (US. OR CANADA).This free service
will provide a “One-Call” number for the geographic area that you select. Before you start any digging
project, be sure to call the local One-Call system in your area and any utility company that does not
subscribe to the One-Call system. The One-Call representative will notify participating utility companies
of your proposed digging activities. Utilities will then mark their underground facilities by using the
following international marking codes:
Red Electric
Yellow Gas, oil, or petroleum
Orange Communication, telephone, television
Blue Potable water
Green/brown Sewer
White Proposed excavation
Pink Surveying
For areas not represented by One-Call Systems International, contact the appropriate utility companies to
locate and mark the underground installations. Do not rely on visual evidence of underground utilities
such as manhole covers or electrical drop boxes…CALL!
WORK SITE ASSESSMENT
Examine the work area for any conditions or obstructions that may inhibit tilling or create a safety hazard
for the operator or others. Use the information in this manual combined with good judgment to identify
any hazards to avoid.
In addition to calling to DETERMINE LOCATION OF UNDERGROUND UTILITIES (see previous
section for details), the operator and/or job foreman should visually inspect the work site. Look for
electrical drop boxes, notices of underground placements, manhole covers, recent trenching or tilling
activity, any evidence of possible underground placements, banks, drop-offs, rocks, wire, uneven terrain,
any existing holes and toxic ground conditions.
Only operate tiller outdoors and avoid breathing engine exhaust and fumes.
WARNING: Engine exhaust contains carbon monoxide gas that is toxic. Breathing it can cause
unconsciousness and death. Do not operate tiller near any source of flammable dust or vapors.

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WORK SITE ASSESSMENT (continued)
WARNING: Sparks from the engine exhaust can cause an explosion or fire in a flammable or
explosive atmosphere. Fuel fumes can catch fire or explode.
Allow adequate side and overhead clearances between tiller and any objects such as buildings,
fences, and trees.
Adequate lighting is required, daylight or artificial, for safe operation of the tiller.
Keep others away. If the job site is near a road or pedestrian path, warn and divert both motorized
traffic and pedestrians. As appropriate, erect barriers, use traffic flag personnel, signs, cones, and
lighting devices to insure safety.
WARNING: Someone could step into the tilled area by accident. Walking near the edge of the
tilled area could cause loss of balance and possibly cause someone to fall into the rotating tines.
Contact with the rotating tines while in operation will cause serious injury or even death.
MACHINE FUNCTION CHECK: If the operator releases the VALVE LEVER, the rotating tines should
stop. This is intended for your safety and must be maintained in good functional condition. Contact your
dealer or the factory if anything on the tiller does not function properly.
CONTACT WITH UNDERGROUND UTILITIES
After LOCATING UNDERGROUND UTILITIES and performing the WORK SITE ASSESSMENT,
accidental tine contact with a buried utility might still occur. If it does, stop tilling and call 911 for help.
If you cut a wire or cable, assume that you do not know what kind it is. It may be electrical or any one of
several communication lines: telephone, television, or fiber optic. In any case, do not touch it or even
look at the ends of it. Stop tilling and call 911 for help. Do not till any more until the appropriate utility
company has assessed the situation, taken appropriate action, and informed you that is safe to proceed.
If you strike a pipe, it could be gas, oil, petroleum, water or sewer. In any case, stop tilling, shut off the
engine, and evacuate the area immediately. Call 911 for help.
Electrical wires or cables: If you think that you may have severed electrical wires, stop tilling and call
911 for help. Keep yourself and other people away from the area.
DANGER: An electric shock could kill you. Assume that any severed wire or cable is HOT with
voltage and do not touch it!
Gas lines: If you think that you may have struck a gas line, shut off the engine and evacuate the area
immediately. Call 911 for help.
DANGER: A gas explosion could kill you. Sparks will likely occur from the tines scraping the
metal pipe. If gas leaks out an explosion could easily occur.
Fiber optic cables: If you think that you may have severed a fiber optic cable, do not touch or even look
at the ends of it.
WARNING: Fiber optic cables convey laser light that can injure your eyesight. Call 911 for help.