Alamo T 7740 manual Eleminate Erratic Boom movement

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TECHNICAL INFORMATION BULLETIN No. 041398

Alamo Industrial ™ Technical Services Department

1502 East Walnut

Seguin, Texas 78155

830-372-2708

Models: All Machete Boom , MB21 & MB24 All Slope Mowers

Bulletin No:

041398

Date:

Apr. 13, 1998

Eleminate Erratic Boom movement:

(which utilize the joystick operated proportional valve system)

Procedures to eliminate erratic boom operation caused by microwave interference from customer installed two-way radios.

There have been some scattered reports in regards to erratic or unexpected movement of one or more of the proportionally controlled boom functions of the joystick control system during the operation of the customer installed two-way radios.

Specifically, the Swing , Lift or Dipper functions may operate at a speed of one foot of movement every 10 to 20 seconds, depending on the function and direction, when the radio microphone is keyed.

Research and experiments with machines in the field has revealed that this phenomenon is the reception of the signal transmitted by the radio passing through the variable controls of the boom control system. Specifically, the wire harness of the control system acts much like a receiving antenna and receives the radio signal which sends a false signal through harness.

Elimination of the interference may be obtained with the use of at least of three possible options:

1.Remove the radio from the tractor completely.

2.Install a reflecting plate under the Antenna. A reflecting plate is simply a thin, flat piece of metal which provides the proper amount of impedance to essentialy reflect the signal emanating down from the antenna and prevent interference with the valve electronics and tractor functions. Since the installation requires a fairly large (at least 36" square) area, the specially designed reflecting or "ground plane tape" can be used in place of the metal sheet for easier installation. this tape is available at most electronics or radio equipment sources.

3.Utilize a ground plane antenna. These specially designed antenna utilize the standard central radial element and at least two other radials set at 45° angles to the central one. These radials must be cut to specific lengths depending on the frequency of the system. Only a professional radio installer or retailer should be consulted in regard to the avaialbility and proper installation of these antenna.

The installation, operation, and resulting effects to the tractor or any attachment due to the addition of a radio system to any machine is the responsibility of the machine owner and the radio installer. Only trained, profesional radio installers should be utilized.

This document does not authorize the repair or replacement of parts under warranty

MACHETE

© 2005 Alamo Group Inc.

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Contents Information Service Bulletins EditionPage Information & Service Bulletins Introduction Index Machete Section Service Bulletins Alamo Group Inc Section Pulley Fastening to Cutter Shaft of Flail Axe Head SubjectMachete Failures of the mower push-pull switch ModelsTechnical Information Bulletin Information Bulletin 092895 from previousWelding Procedure Parts NeededInformation Bulletin 121495 from previous Corrective Action New Piston Pump used on Machete New Parts Old PartsNew Seal Protector Added to Blade Bar Assembly Information Bulletin 032596 from previous Oil Leaking from new single Acting Hydraulic Cylinders Dead Batteries on New tractors Cracks in Main Frame Information Bulletin 010397 from previous Interference between Tube Clamps and Main Frame Valve Block O-Ring Replacement Kit available King Pin and Boom Pin Bushing Drivers Available Machete Repair Procedures Hitch Post Replacement KitsHitch Post Replacement Kits Information Bulletin 041797-1 from previous Flanges to prevent rustCylinder & Linkage Pin Replacement Kits Kit NumbersInformation Bulletin 041797-2 from previous Tilt Link Arm Stop New Thick Blade Bar & Larger Bolts Parts needed Joystick Power Cut Off SwitchProcedure Cylinder, Link Arm, Turning Arm & Hitch Post Pin Update Kit Parts RequiredUpdate Kits Combined Kit P/N Machete Lock Valve Installation Instructions Following parts are required to make this modificationTo Valve Information Bulletin 120697 from previousElectrical connection Eleminate Erratic Boom movement Hood to Frame Interference on TS Series Tractors Part Numbers requiredNew Holland TS Series Fuel Filter New Oil Filter Kit P/N Spindle Oil Filler Kit P/N Element Service Procedure Filter Maintenance ProcedureWhen to Change Filter Control Valve Relocation Change in the availability of rebuilt components Filter Kit to Update Control Valve System Kit P/N Filter Maintenance Procedure Buzz Bar Drive Coupling Design change Spindle Bearing Lubrication Update ConversionRecommended Brands of Hydraulic Oil Warranty Repairs Effective February 18Factory Spoke Cast Pulley Information Bulletin 041503 from previous Protection of Lexan Sheets Installation ProcedureRecommended Tools Information Bulletin 102103 from previous Driveline Update Kit KIts AvailableInformation Bulletin 011304 from previous Pulley SpacerMachete Service Bulletins Parts Labor Old Parts Disposition Termination Date Joystick ReplacementService Required Motor to Spindle Bolt Replacement King Post Pin Replacement Longer Pins Machete Rear Flap Bracket, Machete Rotary Head Service Bulletin Service Bulletin 962503-1 from previousLower Crossmember Kit Installation Frame Rail Reinforcement, LH Frame Rail Joystick Control of Boom Movement Restrictor Installation Tilt Cylinder Function Next Turning Arm King Pin UpgradesParts Required Turning Arm King Pin Replacement Kits Service Bulletin 971903 from previous Boom Hinge Point Pin Upgrades Service Bulletin 972103 from previous Restrictor Installation Lift & Dipper Cylinder Function Upper King Pin Bushing Slipping Blade Bolt Inspection / Recall Lower Cross Member Reinforcement Kit P/N Model T6640 New Holland T7740 & T6640 A/C Drier CampaignUnits Serial Numbers Model T Special NoteNew Holland TS Tractor Inspection Campaign Units Serial NumbersTurning Arm Pin Update Kit P/N Service Bulletin 991012 from previous Dipper Boom Reinforcement Plates Repair PlatesValve Pressure Filter Kit Buzz Bar Head Motor Coupler Re-Design Buzz Bar Head Motor Coupler Coupler Update Kit Blade Bolt Inspection 222 Blade Carrier Retaining BoltsAll Brahmas Port Plug Update SubjectService Instructions Parts RequiredPage Alamo Group Inc