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HYDRAULIC TRENCHER OWNER'S MANUAL
CONGRATULATIONS!
You are now the proud owner of the BARRETO trencher. The OPERATOR'S MANUAL is
attached to the machine. Please study it and this manual to become familiar with the trencher, 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
(800) 525-7348 (541) 963-7348
FAX (541) 963-6755
E-Mail:
info@barretomfg.com
Web Site:
http://www.barretomfg.com
Machine Identification Record
Machine model number ________________________
Machine serial number ________________________
Engine manufacturer
Engine model number ________________________
Engine serial number
912 Owner's Manual
MODEL 912HM
________________________
________________________
THE
8/31/21
Page 1 of 16

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Summary of Contents for Barreto 912HM

  • Page 1 HYDRAULIC TRENCHER OWNER’S MANUAL CONGRATULATIONS! You are now the proud owner of the BARRETO trencher. The OPERATOR’S MANUAL is attached to the machine. Please study it and this manual to become familiar with the trencher, its characteristics, and method of operation. Pay particular attention to the safety and operating instructions to prevent personal injury or equipment damage.
  • Page 2: Table Of Contents

    Upon delivery, check for freight damage and any missing items. Report any damage immediately to the carrier and Barreto Manufacturing and take pictures if possible. Remove trencher 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 handlebars.
  • Page 3: Trencher Delivery And Assembly Instructions

    (See page 10 for illustrations of lubrication points.) IMPORTANT: The engine on the Barreto trencher is normally serviced prior to shipping. However, shipping regulations may prohibit shipping with fuel or oil in the machine. Check levels and add oil and fuel as required before starting engine.
  • Page 4: Hour Meter

    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.
  • Page 5: Chain Installation

    CHAIN INSTALLATION 1. Slide chain under sprocket, with teeth in the 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). 2.
  • Page 6: Warranty Of Barreto Manufacturing Equipment

    Barreto Manufacturing, Inc. warrants all BARRETO equipment 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.
  • Page 7: Wheel Drive Valve Cable Adjustment

    WHEEL DRIVE VALVE CABLE ADJUSTMENT The clutch cable and lever must have some free play. The cable will stretch and occasionally needs adjustment. 1. 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. 2.
  • Page 8: Wheel Drive Neutral Adjustment

    WHEEL DRIVE NEUTRAL ADJUSTMENT 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.
  • Page 9: Chain Valve Adjustment

    CHAIN VALVE ADJUSTMENT The chain valve control should be adjusted to completely activate the chain valve when the dig chain control is in the ON' position. To check this adjustment, put the chain on/off control in ON position (with engine stopped). Pull the clutch lever on left handlebar up until it touches the handgrip.
  • Page 10: Lubrication Requirements

    DAILY LUBRICATION REQUIREMENTS Be sure to grease all lubrication points as outlined on page 3 of this manual. 912 Owner’s Manual 8/31/21 Page...
  • Page 11: Electrical Schematic - Honda Gx270

    ELECTRICAL SCHEMATIC - HONDA GX270 912 Owner’s Manual 8/31/21 Page...
  • Page 12: Hydraulic Schematic

    HYDRAULIC SCHEMATIC 912 Owner’s Manual 8/31/21 Page...
  • Page 13: Specifications

    SPECIFICATIONS MODEL NUMBER 912HM DIMENSIONS Weight 620 lb. (281.23kg) 43” (1.09m) Height 81” (2.06m) Length 28” (711.2mm) Width 30” (762.25mm) Wheel Base ENGINE Engine Options Honda GX270 Fuel Gasoline Power: hp (kW) at 3600 RPM 8.5 hp (6.34kW) Fuel Capacity 0.95 U.S.
  • Page 14: Troubleshooting Guide

    C. Chain fails to rotate, but wheel drive works. 1. Chain motor worn. Rebuild motor or replace. New motors are available from Barreto Manufacturing. 2. Chain Control Relief Valve Adjust Relief Valve to 2200 psi or replace relief spring malfunctioning.
  • Page 15 2. Worn or broken hoses. Replace damaged hoses. 3. Oil around chain motor or shaft. Inspect motor for leaking shaft seal. Rebuild or replace motor. New motors are available from Barreto Manufacturing. F. Foaming hydraulic oil coming from breather hose. 1. Improper oil used.
  • Page 16: Index

    INDEX ADJUSTMENTS, 5, 7, 8, 9, 14, 15 BOOM, 2, 3, 5, 6, 14, 15 CHAIN, 2, 3, 5, 6, 9, 13, 14, 15 CHAIN INSTALLATION, 5 CHAIN VALVE ADJUSTMENT, 2, 9 CLUTCH CABLE, 7, 14 DAILY LUBRICATION REQUIREMENTS, 10 ELECTRICAL SCHEMATIC - HONDA GX270, 2, 11 ENGINE, 3, 4, 5, 6, 9, 14, 15 GREASE, 3, 10...

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