Barreto E37SG CENTER PIVOT User manual

37SG OWNER’S MANUAL 9/05/19 Page 1 of 19
THE
MODEL E37SG CENTER PIVOT
HYDRAULIC TRACK STUMP GRINDER
OWNER’S MANUAL – ORIGINAL INSTRUCTIONS
CONGRATULATIONS!
You are now the proud owner of the BARRETO stump grinder. The OPERATOR’S MANUAL is
attached to the machine. Please study it and this manual to become familiar with the stump grinder, its
characteristics, and method of operation. Pay particular attention to the safety and operating instructions
to prevent personal injury or equipment damage.
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.
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: [email protected]
Web Site: http://www.barretomfg.com
U.S. Patent No. 10,260,567
Machine Identification Record
Machine model number ________________________
Machine serial number ________________________
Engine manufacturer ________________________
Engine model number ________________________
Engine serial number ________________________

37SG OWNER’S MANUAL 9/05/19 Page 2 of 19
TABLE OF CONTENTS
STUMP GRINDER INSTRUCTIONS UPON DELIVERY 3
SERVICE INFORMATION 3
HOUR METER 4
STUMP GRINDER INTENDED USE 5
LUBRICATION REQUIREMENTS 5
OPERATOR TRAINING 6
WARRANTY OF BARRETO MANUFACTURING EQUIPMENT 6
MAINTENANCE PREPARATION 6
ROUTINE MAINTENANCE 7
HYDRAULIC HOSE REPLACEMENT 8
CHANGING THE HYDRAULIC FLUID 8
BRIGGS/VANGUARD MAINTENANCE SCHEDULE 9
TRACK TENSION ADJUSTMENT 10
BATTERY MAINTENANCE 11
CUTTER WHEEL TORQUE SPECS 12
STUMP GRINDER ELECTRICAL SCHEMATIC WITH BRIGGS/VANGUARD 13
ELECTRICAL SCHEMATIC – BRIGGS/VANGUARD 14
HYDRAULIC SCHEMATIC 15
STUMP GRINDER TROUBLESHOOTING GUIDE 16
SPECIFICATIONS 18
INDEX 19

37SG OWNER’S MANUAL 9/05/19 Page 3 of 19
STUMP GRINDER INSTRUCTIONS UPON DELIVERY
Upon delivery, check for freight damage and any missing items. If there is damage, notify the carrier and
Barreto Manufacturing immediately and make sure to document there was damage on the delivery
receipt. Please take pictures of any damage immediately if possible before unpacking crate. Remove
machine from shipping crate.
When documentation refers to “right side” or “left side”, it is relative to the operator’s position with both
hands on the controls.
SERVICE INFORMATION
HYDRAULIC SYSTEM:
•Your stump grinder should arrive with approximately 14 U.S. gallons (53 liters) of tractor
transmission / hydraulic fluid in the tank. Shipping regulations may prohibit shipping with the
hydraulic fluid. Check the reservoir level using the sight gauge on the side of the tank. If required,
add tractor transmission / hydraulic fluid to the reservoir. For machine use in ambient temperatures
between +32°F (0°C) and +90°F (32°C) hydraulic fluid ISO 68 is recommended. If the machine is
operated at temperatures below +32°F (0°C) then hydraulic fluid ISO 46 is recommended.
•Recheck oil level after stump grinder has been run and oil has circulated through the components.
Routinely check level thereafter.
•Change hydraulic fluid filter after the first 50 hours of use. Change it every 200 hours thereafter.
•Add approximately one quart (1 liter) of hydraulic fluid to reservoir with each filter change.
•Discard the old filter according to environmental standards in your geographic area.
•Check all hydraulic fittings for leaks and tighten if necessary.
WARNING - Running the stump grinder without hydraulic fluid will cause serious damage to the
hydraulic pump. INSURE THAT THE RESERVOIR FLUID LEVEL IS VISIBLE IN THE SIGHT
GAUGE BEFORE STARTING THE MACHINE.
***IMPORTANT: If the couplers between the engine and the cutter head pump
are moved or removed for any reason, it is CRITICAL that they have a 1/16th
inch 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.
IMPORTANT - The engine on the Barreto stump grinder may or may not have been serviced prior to
shipping. Shipping regulations may prohibit shipping with fuel or oil in the engine. Check levels and add
oil and fuel as required before starting engine. Service the engine according to the engine owner’s manual
before starting.
NOTE: We recommend that the cutter teeth be tightened to 25 ft. lbs. after every use.

37SG OWNER’S MANUAL 9/05/19 Page 4 of 19
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 other 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

37SG OWNER’S MANUAL 9/05/19 Page 5 of 19
STUMP GRINDER INTENDED USE
The Barreto Stump Grinder is designed to remove in-ground tree stumps and exposed roots. It should not
be used to cut any material other than wood stumps and the surface soil around the stumps or exposed
roots.
LUBRICATION REQUIREMENTS
Grease at the intervals indicated per the illustration of grease lubrication points. There is also a grease
diagram decal on the machine.

37SG OWNER’S MANUAL 9/05/19 Page 6 of 19
OPERATOR TRAINING
Rental companies should demonstrate all of the machine operations to each rental customer including:
•Starting up the engine.
•Loading the stump grinder onto the trailer and securing it for road transport.
•Unloading the stump grinder from the trailer.
•Grinding procedure - Operation of the stump grinder.
WARRANTY OF BARRETO MANUFACTURING EQUIPMENT
Barreto Manufacturing, Inc. warrants all BARRETOequipment to be free of defects in material and
workmanship for a period of one (1) year. All BARRETO fuel components, fuel tank, cap, lines &
fittings are warranted for two (2) years. Warranty period begins on date of 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 of 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 attached fuel tanks, engine accessories, batteries and tires are warranted by the
original manufacturer and are not covered by the Barreto Equipment Warranty.
Wear parts such as cutter wheels and teeth, holders and bolts, dig chains, dig teeth, sprockets,
chain rollers, bearings, bushings etc. are excluded unless it can be determined that a defect has
contributed to premature wear.
MAINTENANCE PREPARATION
Only trained & qualified personnel should perform maintenance or repairs of the stump grinder. Before
performing any service, maintenance, adjustments, repairs, or off-season long-term storage, follow the
SHUT DOWN PROCEDURE in the OPERATOR’S MANUAL.
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.
Read the BATTERY & ELECTRIC STARTER SAFETY INSTRUCTIONS. Disconnect the battery,
removing the negative terminal first by loosening the wing nut where the cable end is secured to a post on
the stump grinder frame. When ready to reattach the cables, reconnect the positive terminal first.

37SG OWNER’S MANUAL 9/05/19 Page 7 of 19
ROUTINE MAINTENANCE
Routinely check the condition, clean, tighten, repair, or replace as necessary the following:
•Muffler guard
•Hydraulic hoses and fittings
•Fuel lines
•Fasteners
•Safety decals
Barreto recommends using genuine Barreto spare parts to ensure not only quality but also the health
and safety of the operator.
Clean safety decals often using soap and water. Do not use abrasive cleaners or solvents such as
mineral spirits that may damage the decals. Replace any damaged (unreadable) or missing decals. If
you replace a machine part that has one or more decals affixed to it, replace the decals also.
Replacement parts and decals can be purchased from Barreto Manufacturing, Inc. When attaching
decals, the temperature of the mounting surface must be at least 40°F (5°C) and must be clean and
dry.
Service the engine according to the engine owner’s manual. Follow the directions for all aspects of
service including air filter change, oil level checking, filling, draining, disposal of engine oil, disposal
of petrol/gasoline, and off-season long-term storage.
Off-season long-term storage of the stump grinder can be at any ambient temperature.

37SG OWNER’S MANUAL 9/05/19 Page 8 of 19
HYDRAULIC HOSE REPLACEMENT
•Make sure stump grinder is turned off and cooled down.
•Ensure the stump grinder is on a level and stable surface/ground.
•Identify the size of the tool needed for hose removal.
•Have shop rags/towels handy to absorb any fluid in the line.
•Make sure your replacement hose is the correct one.
•Once hose is replaced, make sure the fittings are tightened back up.
•Start machine and run all functions.
•Inspect hose(s) for leaks.
•Tighten fittings to spec as illustrated below.
•Make sure hydraulic fluid is filled to the top of the sight glass. (If low see page 3)
Thread
Size
Assembly Torque
(in-lb)
Assembly Torque
(ft-lb)
Tube Connection
FFFT
Swivel Nut or
Hose FFFT
2
35 - 45
2 - 4
N/A
N/A
3
65 - 75
5 - 7
N/A
N/A
4
130 - 150
11 - 13
2
2
5
165 - 195
14 - 16
2
2
6
235 - 265
20 - 22
1.5
1.25
8
525 - 575
43 - 47
1.5
1
10
650 - 750
55 - 65
1.5
1
12
950 - 1050
80 - 90
1.25
1
14
1200 - 1300
100 - 110
1
1
16
1400 - 1500
115 - 125
1
1
20
1900 - 2100
160 - 180
1
1
24
2250 - 2550
185 - 215
1
1
32
3000 - 3400
250 - 290
1
1
CHANGING THE HYDRAULIC FLUID
•Lift machine high enough to place a container large enough to hold at least 15 gallons.
•Remove the drain plug using a 5/16” hex key wrench and allow to drain.
•Replace drain plug.
•Remove the fill plug using a 9/16” hex key wrench.
•Fill to the top of the sight glass using a suitable hydraulic fluid. (See page 3)
•Replace fill plug.
•Dispose of the used fluid according to your local laws and regulations.

37SG OWNER’S MANUAL 9/05/19 Page 9 of 19
BRIGGS/VANGUARD MAINTENANCE SCHEDULE
Please see your engine owner’s manual for specific procedures and products to use for proper
maintenance of your engine, as well as proper disposal of used parts/fluids.

37SG OWNER’S MANUAL 9/05/19 Page 10 of 19
TRACK TENSION ADJUSTMENT
Track must be tensioned enough to prevent de-tracking. Too much tension will cause increased wear on
roller, sprockets and drive motor bearings. There are two methods of measuring correct tension: Measure
the compression of the springs, or measure track sag.
To measure spring compression:
Loosen tension adjuster nut and lock nut completely. Measure free length of springs. Then tighten
adjuster nut to compress tension spring pair to a length of 5/8” (16mm) less than free length. Tighten lock
nut.
To measure track sag:
Lift the machine and raise the track off the ground. Measure the distance between either one of the central
rollers and track metal core bars and adjust track tension to get 1/2” (13mm) track sag.
To remove/replace track:
1. Completely loosen tensioner nuts.
2. Retract idler completely.
3. Remove track from idler first, sprocket second and front roller last.
4. Reverse procedure to replace track.
Adjust track tension per instructions and illustration.

37SG OWNER’S MANUAL 9/05/19 Page 11 of 19
BATTERY MAINTENANCE
Follow the SHUT DOWN PROCEDURE in the OPERATOR’S MANUAL before doing any
battery maintenance. For your safety always abide by the following:
Shield entire face, especially your eyes, and wear rubber gloves to avoid acid burns whenever doing
anything with the battery. Battery caps must be tightly in place if the battery has removable caps.
WARNING: The battery contains sulfuric acid that can cause blindness and severe burns. Avoid
contact with eyes, skin, and clothing. If acid contacts eyes, call 911 immediately and flush eyes
with water for 15 minutes or until emergency medical help arrives. If acid contacts skin, flush area
with plenty of water. If acid is ingested, drink large quantities of water or milk then follow with
milk of magnesia, beaten egg, or vegetable oil, and get medical attention immediately.
Avoid contact with battery components. Wear rubber gloves and wash hands after handling any
battery components.
WARNING: Battery posts, terminals, and related accessories contain lead and lead compounds,
chemicals known to cause cancer and reproductive harm. Acid can cause blindness and severe
burns if leaked from the battery.
Do not charge or jump-start the battery near flames or sparks, or while smoking.
WARNING: Battery fumes are flammable and explosive. Avoid explosion hazard that could blind
and burn. Tools and jumper cable clamps can make sparks, so use them with care. Shield eyes
and face, and wear rubber gloves.
ELECTROLYTE LEVEL: Check the battery electrolyte level every 25 hours of machine use and
if necessary add distilled water following this procedure:
1. Disconnect the battery cables, removing the negative cable first.
2. Remove the battery from the machine.
3. Clean the battery exterior with paper towels.
4. If the battery posts and cable terminals are corroded, clean them with a wire brush cleaner
tool. A solution of four parts water and one part baking soda is helpful.
5. Remove the battery caps.
6. Slowly pour distilled water into each battery cell until the electrolyte level is up to the full line
indicated for each cell on the battery. Do not overfill. Overflow of electrolyte, which contains
sulfuric acid, can cause severe corrosion to the stump grinder.
7. Reinstall the battery caps tightly in place.
8. Apply a light coating of grease to the battery terminals to help prevent corrosion.
9. Reinstall the battery securely into the stump grinder.
10. Reconnect the cables. Attach the positive cable first, then the negative one.

37SG OWNER’S MANUAL 9/05/19 Page 12 of 19
BATTERY MAINTENANCE (continued)
BATTERY VOLTAGE LEVEL: Check the voltage level using an appropriate meter. Always keep the
battery fully charged and clean to help prolong battery life expectancy, especially when the temperature is
below 32°F (0°C). For off-season long-term storage, we recommend removing the battery from the stump
grinder and storing where the ambient temperature remains above freezing.
TO CHARGE THE BATTERY follow this procedure:
1. Disconnect the battery cables, removing the negative cable first.
2. Remove the battery from the machine.
3. Clean the battery exterior with paper towels.
4. If the battery posts and cable terminals are corroded, clean them with a wire brush cleaner tool. A
solution of four parts water and one part baking soda is helpful.
5. Apply a light coating of grease to the battery terminals to prevent corrosion.
6. Check the battery electrolyte level (see procedure above).
7. Insure that the battery caps tightly in place.
Do not charge the battery near flames or sparks, or while smoking.
WARNING: Battery fumes are flammable and explosive. Avoid explosion hazard that could blind
and burn. Tools and jumper cable clamps can make sparks, so use them with care. Shield eyes and
face, and wear rubber gloves.
8. Connect a 12-volt DC battery charger and charge at 3 to 4 amperes for 4 to 8 hours. Do not
overcharge.
9. When the battery is fully charged, turn off and unplug the charger from the electrical outlet, then
disconnect the charger leads from the battery posts.
10. Reinstall the battery securely into the stump grinder.
11. Reconnect the cables. Attach the positive cable first, then the negative one.
CUTTER WHEEL TORQUE SPECS
We recommend that the teeth and holders be inspected after every use to maximize the usable life
of these high wear items.
•Cutter teeth have three sides and we recommend rotating them frequently to keep the cutting
edges sharp. A torque wrench should be used to torque these down to 25 ft. lbs. A worn and
unsharpened tooth will cause the holders to wear prematurely, resulting in poorer performance and
increased maintenance costs.
•The holders should be inspected and torqued to 180 ft. lbs. using a torque wrench as well.
•The nuts that fasten the axle and drive stubs on the cutter wheel together should be torqued to 55
ft. lbs. using a torque wrench.

37SG OWNER’S MANUAL 9/05/19 Page 13 of 19
STUMP GRINDER ELECTRICAL SCHEMATIC WITH BRIGGS ENGINE

37SG OWNER’S MANUAL 9/05/19 Page 14 of 19
37 HP BRIGGS/VANGUARD ELECTRICAL SCHEMATIC

37SG OWNER’S MANUAL 9/05/19 Page 15 of 19
HYDRAULIC SCHEMATIC

37SG OWNER’S MANUAL 9/05/19 Page 16 of 19
STUMP GRINDER TROUBLESHOOTING GUIDE
CAUTION!! Always use extreme care when troubleshooting or making adjustments on stump grinder.
Stay clear of cutter wheel when engine is running. Stop engine before disassembling any component.
A. Entire hydraulic system does not operate and the engine is not under load.
1. Low hydraulic fluid in tank.
2. Hydraulic pump-to-engine coupler has
slipped.
3. Main pump suction leaking air into pump
intake.
Add hydraulic fluid until it shows in sight
gauge.
Check for wear and replace both coupler
halves and rubber spider, as needed.
Check main suction hoses and fittings for
leaks and tighten fitting nuts
B. Engine lugs down or dies and tracks and cutter wheel do not turn.
1. Rocks or other obstructions jammed in
cutter wheel housing.
2. Cut depth or swing speed too great.
3. Engine improperly tuned or maintained.
4. Low oil alert causes engine to shut down.
5. Engine losing power due to wear.
Raise cutter head. See if obstruction can be
removed from cutter housing.
Decrease sweep speed or cutting depth.
See engine manual and correct as needed.
This may occur when grinding on hills. Level
grinder, check oil and allow oil alert to reset.
See engine manual.
C. Cutter fails to rotate, but track drive works.
1. Cutter motor worn.
2. Cutter Relief Valve malfunctioning.
3. Cutter drive pump worn.
Rebuild or replace motor. New motors are
available from Barreto Manufacturing.
Adjust Relief Valve to 3500 PSI or replace
relief spring if needed.
Replace pump.

37SG OWNER’S MANUAL 9/05/19 Page 17 of 19
STUMP GRINDER TROUBLESHOOTING GUIDE (continued)
D. Tracks fail to turn, but cutter rotates.
1. Sprocket key sheared.
2. Pump control linkage loose.
Replace key and other parts as needed.
Tighten or replace bolts.
E. Hydraulic fluid leaks in hydraulic system.
1. Fittings are loose.
2. Worn or broken hoses.
3. Hydraulic fluid around cutter motor or
shaft.
Tighten fittings on hoses and adapters.
Replace damaged hoses.
Inspect motor for leaking shaft seal. Rebuild or
replace motor. New motors are available from
Barreto Manufacturing.
F. Foaming hydraulic fluid coming from breather hose.
1. Improper fluid used.
2. Air leaking into fluid.
Verify that hydraulic fluid used had
antifoaming additives. Tractor transmission /
hydraulic fluid ISO 68 is recommended for use
in temperatures above +32°F.
Inspect and tighten fittings and clamps on
pump intake hoses.
G. Cutter does not lift.
1. Lift relief valve malfunctioning.
2. Lift cylinder piston seal damaged or rod
bent.
Adjust relief to 1000 PSI. This may require a
replacement spring in valve.
Disassemble & replace parts as required.

37SG OWNER’S MANUAL 9/05/19 Page 18 of 19
SPECIFICATIONS
MODEL NUMBER E37SGB
DIMENSIONS BRIGGS/VANGUARD
Weight 1950 lb (884.5 kg)
Height 52.2” (1.32 m)
Length 92.5” (2.35 mm)
Width 35.5” (901.7 mm)
ENGINE
Engines Briggs/Vanguard
Fuel Gasoline
Power: hp (kW) at 3600 RPM 37 hp (27.6 kW)
Fuel Capacity 4.6 U.S. gallons (17.4 liters)
Engine Oil Capacity 1.8 quarts (1.7 liters)
Electric Start Standard
Hour Meter Standard
HYDRAULIC SYSTEM
Reservoir Capacity 14 U.S. gallons (53 liters)
Oil Cooler Standard
TRACK SYSTEM
Track Width 7.1” (180 mm)
Total Ground Contact 482.8” (.312 sq/m)
OPERATIONS
Ground Drive, Forward 190 feet per minute (57.9 m/m)
Ground Drive, Reverse 90 feet per minute (27.4 m/m)

37SG OWNER’S MANUAL 9/05/19 Page 19 of 19
INDEX
BATTERY, 2, 6, 11, 12
BATTERY CHARGING, 12
BATTERY ELECTROLYTE LEVEL, 11
BATTERY MAINTENANCE, 11
BATTERY VOLTAGE LEVEL, 12
CHANGING THE HYDRAULIC FLUID, 2, 8
DECALS, 7
ELECTRICAL SCHEMATIC WITH BRIGGS ENGINE, 13
ELECTRICAL SCHEMATICS, 2, 13, 14
ENGINE, 1, 4, 16, 18
GREASE, 5, 11, 12
HOUR METER, 4
HYDRAULIC FLUID, 3, 6, 8, 16, 17
HYDRAULIC HOSE REPLACEMENT, 2, 8
HYDRAULIC SCHEMATIC, 15
HYDRAULIC SYSTEM, 3, 18
INSTRUCTIONS UPON DELIVERY, 2, 3
INTENDED USE, 2, 5
LUBRICATION, 5
MAINTENANCE, 2, 6, 7, 9, 12
OPERATOR TRAINING, 6
SERVICE, 3
SPARE PARTS, 7
SPECIFICATIONS, 18
TRACK TENSION ADJUSTMENT, 10
TROUBLE SHOOTING, 16
WARRANTY, 6