1. Manuals
  2. Brands
  3. BMC Manuals
  4. Construction Equipment
  5. LD6
  6. Operator's manual

BMC LD6 Operator's Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

OPERATOR'S MANUAL for
LD6 & MD8 BACKHOES
Back Hoes
Front End Loaders
Front Blades
Power Steering
Trenchers

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the LD6 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for BMC LD6

Summary of Contents for BMC LD6

  • Page 1 OPERATOR’S MANUAL for LD6 & MD8 BACKHOES Back Hoes Front End Loaders Front Blades Power Steering Trenchers...

  • Page 2: Table Of Contents

    Table of Contents Page Safety Precautions General Information LD6 Backhoe MD8Backhoe LD6 and MD8 Backhoe Box Parts LD6 Backhoe Installation 6-12 MD8 Backhoe Installation 13-19 LD6 and MD8 Bucket Installation LD6 and MD8 Hose Installation 21-25 Controls 26-27 Operations 28-34...

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS The following precautions are suggested to help TRACTOR SAFETY PRECAUTIONS prevent accidents. A careful operator is the best Do not start the engine while standing beside the operator. tractor. Always sit in the tractor seat when starting the engine.

  • Page 4: General Information

    To mount either of the basic Backhoes to a tractor, a mounting kit (for a specific tractor model) is required. Also required is one of the three bucket options for the LD6 and one of the four for the MD8. Items unique to each tractor fit up (pressure / return hoses, seat assemblies, mounting bolts, etc.) are included in the mounting kit for each tractor.

  • Page 5: Ld6 Backhoe

    LD6 BACKHOE Fig. 1 SERIES LD6 BACKHOE 1. Main Frame 8. Crowd Cylinder 2. Main Boom 9. Bucket Cylinder 3. Dipper Arm 10. Control Valve 4. Bucket 11. Stabilizer Guard 5. Stabilizer Arm 12. Right Step 6. Stabilizer Cylinder 13. Stabilizer Foot 7.

  • Page 6: Md8Backhoe

    MD8 BACKHOE Fig. 2 SERIES MD8 BACKHOE 1. Main Frame 8. Crowd Cylinder 2. Main Boom 9. Bucket Cylinder 3. Dipper Arm 10. Control Valve 4. Bucket 11. Stabilizer Guard 5. Stabilizer Arm 12. Right Step 6. Stabilizer Cylinder 13. Stabilizer Foot 7.

  • Page 7: Ld6 And Md8 Backhoe Box Parts

    LD6 AND MD8 BACKHOE BOX PARTS The LD6 and MD8 box parts contains items needed to complete the assembling of the LD6 and MD8 Backhoe. Be sure to check the contents of the box against the packing list in the box or against the parts list in this manual.

  • Page 8: Ld6 Backhoe Installation

    LD6 MAIN FRAME ASSEMBLY Fig. 1 ITEM DESCRIPTION QUANTITY Main Frame *Step, Right *Step, Left *Grab Bar Arm, Stabilizer Pin, Stabilizer ¾” x 9 ½” *Guard, Stabilizer Pin, Stabilizer Guard ½” x 5” *Cylinder, Stabilizer *Pin, Cylinder 1” x 3”...
  • Page 9 LD6 MAIN FRAME INSTALLATION The LD6 main frame assembly, Fig 1, is shipped with plates and just above the top plate. Secure the grab bar some of the retaining pins and bolts installed. It will be with two (2) 3/16” x 1 ½” cotter pins (Item 11) as necessary to remove the pins as the different parts are shown in Fig.
  • Page 10 LD6 MAIN FRAME INSTALLATION Attach the right side stabilizer cylinder by repeating steps 7 and 8. (10) Attach the left stabilizer guard (Item 7) over the mounting receptacle, located on the upper portion of the main frame side plate, aligning the two holes in the...
  • Page 11 LD6 MAIN BOOM ASSEMBLY FIG. 1 ITEM DESCRIPTION QUANTITY Main Boom Cylinder, Main Boom Pin, Cylinder ¾” x 2 ¾” Cotter Pin 1/8” x 1” Cylinder, Crowd Pin, Cylinder 1” x 3” Clip, Bobby Pin Bolt, Machine G5P 1” x 6 ½”...
  • Page 12 LD6 MAIN BOOM INSTALLATION The LD6 main boom assembly, Fig. 1, is shipped with Mount the base end of the main boom cylinder the retaining pins and bolts installed. It will be (Item 2) with flat top end of the swing shaft between necessary to remove the pins and bolts as the main the ears of the cylinder clevis.
  • Page 13 LD6 DIPPER ARM ASSEMBLY FIG. 1 ITEM DESCRIPTION QUANTITY Dipper (Crowd) Arm Pin, Bucket Link 1” x 6 ¼” Spacer, Bucket Link 1” I.D. x 1 ¼” O.D. x 2” Cotter Pin 3/16” x 1 ½” Cylinder, Bucket...
  • Page 14 LD6 DIPPER ARM INSTALLATION The LD6 dipper arm (crowd) assembly, Fig. 1, is Raise rod end of dipper (crowd) cylinder and slide shipped assembled with the exception of the adaptor the cylinder clevis astraddle the top anchor lug on the fittings and the retaining pin and bolt.

  • Page 15: Md8 Backhoe Installation

    MD8 MAIN FRAME ASSEMBLY Fig. 1 ITEM DESCRIPTION QUANTITY Main Frame *Step, Right * Step, Left *Grab Bar Arm, Stabilizer Pin, Stabilizer Arm ¾” x 9 ½” *Guard, Stabilizer Pin, Stabilizer Guard ½” x 5” *Cylinder, Stabilizer *Pin, Cylinder 1” x 3” *Cotter Pin 3/16”...
  • Page 16 MD8 MAIN FRAME INSTALLATION The MD8 main frame assembly, Fig 1, is shipped with Install the grab bar (Item 4) in the grab bar some of the retaining pins and bolts installed. It will be mounting receptacle located on the inside of the side necessary to remove the pins as the different parts are plates and just above the top plate.
  • Page 17 MD8 MAIN FRAME INSTALLATION Attach base end of one (1) each stabilizer cylinder (Item 9) to left side of main frame cylinder anchor lug, located in the center and just above the base end of the stabilizer arm, using one each cylinder pin (Item 10) and two each 3/16”...
  • Page 18 MD8 MAIN BOOM ASSEMBLY FIG. 1 ITEM DESCRIPTION QUANTITY Main Boom Cylinder, Main Boom Pin, Cylinder ¾” x 2 ¾” Cotter Pin 1/8” x 1” Cylinder, Crowd Bolt, Machine 1” x 6 ½” Nut, Self-Locking 1” Clamp, Hose 4” Bolt, Machine ¼” x 1 ¼”...
  • Page 19 MD8 MAIN BOOM INSTALLATION The MD8 main boom assembly, Fig. 1, is shipped with the retaining pins and bolts installed. It will be necessary to remove the pins and bolts as the main boom is being assembled to the main frame. The main boom should be attached to the swing shaft as follows: Remove the 1”...
  • Page 20 MD8 DIPPER ARM ASSEMBLY 9, 10 FIG. 1 ITEM DESCRIPTION QUANTITY Dipper (Crowd) Arm Pin, Locking Arm 1” x 7 7/8” Plate, Locking Pin Bolt, Machine G5P ½” x 1 ½” Washer, Lock ½” Spacer, Locking Pin 1” I.D. x 1 ¾” O.D. x 1/8” Spacer, Locking Pin ½”...
  • Page 21 MD8 DIPPER ARM INSTALLATION The MD8 dipper arm (crowd) assembly, Fig. 1, is Raise rod end of crowd cylinder and position shipped assembled with the retaining pin and bolt pin-eye on end of cylinder rod between anchor lugs on installed in the dipper arm. It will be necessary to the dipper arm as shown in Fig.

  • Page 22: Ld6 And Md8 Bucket Installation

    LD6 AND MD8 BUCKET INSTALLATION A variety of bucket sizes are available for the LD6 and MD8 Backhoes. Mounting procedures are identical for all buckets, except the 8” bucket. The Backhoe is shipped with a toggle master link (Item A), toggle link...
  • Page 23 LD6 AND MD8 HOSE ASSEMBLY PRESSURE RETURN Fig. 1 ITEM DESCRIPTION (LD6) DESCRITION (MD8) POINT-TO-POINT QTY. Valve, Control Valve Control Dipper (Crowd) Arm Left Swing Hose 3/8” x 21” Left Swing Hose 3/8” x 21” C1-C2 Right Swing Hose 3/8” x 20”...

  • Page 24: Ld6 And Md8 Hose Installation

    LD6 AND MD8 HOSE INSTALLATION The control valve and hoses for the BMC Series LD6 and MD8 Backhoe are shipped loose, in hose kit carton except for the swing cross-over hoses which are installed. The hosing of the LD6 and MD8 Backhoe are...
  • Page 25 LD6 AND MD8 HOSE INSTALLATION Fig. 5 Fig. 7 Connect end of “boom down” hose (item 5) Connect end of “dipper open” hose (Item 7) equipped with long 90° fitting to upper port (Point F1) equipped with long 90° fitting to upper port (Point H1) on second valve section from right as shown in Fig.
  • Page 26 38” on LD6 and 37” on MD8 crowd cylinder as shown in Fig. 10. Route hose on the...
  • Page 27 LD6 AND MD8 HOSE INSTALLATION (13) Connect end of “right stabilizer up” hose (item (15) Connect end of “left stabilizer up” hose (Item 13) 11) equipped with short 90° fitting to lower Port (Point equipped with short 90° fitting to lower Port (Point N1) L1) on fifth valve section from right as shown in Fig.

  • Page 28: Controls

    CONTROLS The BMC LD6 and MD8 Series Backhoe are operated by two lever controls as shown in Fig. 1. Figure 1 Two Lever Control The easiest way to remember the various lever functions is to relate the various backhoe operations to the operator’s seat facing the rear.
  • Page 29 CONTROLS Stabilizer Levers Bucket Lever Moving the stabilizer lever(s) forward will move the Pushing the bucket lever to the left will “Fill” or curl stabilizer(s) “Down”. Moving the stabilizer lever(s) the bucket (move inward). Pushing the bucket lever to rearward will move the stabilizers “Up”. the right will “Dump”...

  • Page 30: Operations

    WEIGHTING AND COUNTERWEIGHTING The BMC LD6 and MD8 Series Backhoes are not to be used without a front loader or front blade which will lift front wheels. NOTE: Use hand signals shown on page 40 when operator is taking directions from others.
  • Page 31 OPERATION GENERAL Filling the Bucket Operate two or more controlled functions at the same time throughout the filling cycle for smooth action and maximum performance. To obtain a cleaner trench and avoid the buildup of material directly in front of the backhoe, crowd out and completely curl the bucket while starting to lift it from the excavation.
  • Page 32 OPERATION TRENCHING Continuous Trenching With Spaced Bellholes Trenching Trenching is the most basic backhoe dipping opera- tion. Other digging operations are merely variations of this basic function (i.e. filling the bucket, dumping the bucket, and moving the unit forward). Begin by digging the trench to the desired grade. Progress along the trench to the bellhole location and dig as much of the bellhole as possible without moving the backhoe from the trench line setting.
  • Page 33 OPERATION TRENCHING Level the backhoe on slopes with the stabilizers to dig plumb trenches, or use the backhoe or loader to cut a level slot for the uphill wheel and stabilizer. Pile the spoil from the slot on the low side. Position the unit so the backhoe swing post is over the centerline of the trench connection.
  • Page 34 OPERATION MISCELLANEOUS Trenching Close to Walls Back the unit in at an angle close to the wall. Deter- DIGGING UNDER A SIDEWALK OR CURB mine the width of the trench and position the swing post pin half the trench width from the wall. Turn the front wheels so they are parallel to the wall.
  • Page 35 OPERATION MISCELLANEOUS Locate the pipeline with a bellhole about six feet (1828.8 mm) wide and ten feet (3048 mm) long. Then, dig lengthwise along the pipeline to locate the leak. When the leak is located, position the unit to dig at grade level on both sides of the pipeline.
  • Page 36 OPERATION GRAVE DIGGING When a platform is not used, remove sod from under each stabilizer pad, as shown below. Grave Digging For the best grave digging position, back the tractor straight in toward the gravesite. Start digging in the middle of the grave. At first, take shallow bites around the edges to avoid damage to the surrounding sod.

  • Page 37: Backhoe Removal And Storage

    BACKHOE REMOVAL AND STORAGE Position the tractor on a flat surface where the Place blocks under backhoe main frame for support backhoe will be stored. and raise stabilizers until backhoe is resting on blocks. Tilt the backhoe with the boom control until mounting blades clear underside of loader and tractor.
  • Page 38 Bucket Cylinder Base End 90° Zerk Required 1 Bucket Link Bucket End 90° Zerk Required 1 Cylinder End 90° Zerk Required 1 Dipper Arm Toggle Link St. Zerk Required 1 Bucket Pin St. Zerk Required 1 SERIES LD6 BACKHOE LUBRICATION FITTNGS...
  • Page 39 G E N E R A L M A I N T E N A N C E Swing Shaft Assembly Swing Cylinders Base End 90° Zerk Required 2 (1 ea. side) Rod End St. Zerk Required 2 (1 ea. side) Swing Shaft Lower Bearing 90°...

  • Page 40: General Maintenance

    GENERAL MAINTENANCE EVERY 40 HOURS OF OPERATION Note: Escaping hydraulic fluid, under pressure, can be dangerous. Hydraulic fluid escaping under pressure can have enough force to penetrate the skin or destroy eye-sight. Hydraulic fluid may also infect a minor cut or opening in the skin. If injured by hydraulic fluid, seek medical attention at once.

  • Page 41: Torque Charts

    TORQUE VALUES FOR BOLT TORQUE VALUES FOR O-RING BOSS PLUGS, JIC 37° SEAT, SWIVEL NUTS GRADE 5 TORQUE N m TORQUE Ft-lbs MIN. MAX. BOLT SIZE MIN. MIN. MAX. SIZE Ft-lbs Ft-lbs 13.6 13.6 20.3 5/16 20.3 27.1 33.9 40.7 7/16 47.5 54.2...

  • Page 42: Hand Signals And Decals

    For Parts & Service Manual Order No. PSM 68 DECALS Replace Decals when they become illegible Function Decal Part No. BMC 1038 Function Decal Part No. BMC 1037 Series Label Part No. BMC 1067 Brantly Logo Part No. BMC 1066 Series Label Part No.

  • Page 43: Specifications (Ld6 And Md8)

    3.0 sec. Boom Up: 6.0 sec. Mounting Date: Boom Down: 4.5 sec. Separate mounting kit Boom Right: 3.0 sec. required to mount LD6 Boom Left: 3.0 sec. to specific tractor model. BUCKET OPTIONS WIDTH NO. TEETH CAPACITY WEIGHT LD Series: 615-1 8”...
  • Page 44 Specifications MD8 Backhoe OPERATING CRITERIA HYDRAULIC SYSTEM DATA Digging Depth: (A) 8.0 Ft. (243.84 cm) Operating Pressure: 1800 P.S.I (2 Ft. Flat Bottom) Flow Requirements: 4.0 G.P.M Digging Radius: (B) 11 Ft. (340.36 cm) Fluid Type: Type “F” Bucket Clearance: System Capacity: 12 Qts.

  • Page 45: Pre-Delivery Checklist

    PRE–DELIVERY CHECKLIST (Check and Adjust as Required) Hydraulic system oil level. Lubricate backhoe. Remove paint from finished surfaces (backhoe cylinder rods and valve spools.) Backhoe control handles for proper operation. Cycle cylinders to purge air from system. Hydraulic connections for leaks and hoses for proper position to reduce chafing and binding. Control valve relief pressure.
  • Page 49 MOUNTING INSTRUCTIONS NOTE: (1) Right or left designations have reference to right or left side of tractor when seated facing forward. Remove 2” x 6” cross-pieces from shipping pad. Remove bolts holding 605 Backhoe to shipping pad. (Located inside mainframe, about the center of the pad.) Cut wire holding control handles into place, raise each one into place and insert pin, fastening with C-ring provided.
  • Page 50 The Brantly Backhoe should now be fully mounted and ready for use. Check all hoses, bolts pins to assure secure mounting. (Bolts, pins, etc. may vibrate loose during shipping.) NOTE: Hydraulic reservoir must be filled prior to operation. (1) If P.T.O pump is not used, hydraulic oil must be added to loader reservoir.

This manual is also suitable for:

Md8

Table of Contents