Bush Hog PT5 manual Sharpening the Knife

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MAINTENANCE

MAINTENANCE

Sharpening the Knife

After five to twenty operating hours, depending on the work involved the knives require re-sharpening. It is recommended that knives are removed from the cutterbar for re-sharpening.

Switch off tractor, disconnect the con rod, remove the three setscrews securing the knife heel to the knife and withdraw the knife from the cutterbar.

Clean the knife and ensure that neither the back nor the knife sections are bent. Straighten as necessary. A cutting angle of 35-40 degrees is required.

A high speed hand grinder should be used with ideally, a pot shaped pencil grinder of approximately 25 MM (1”) dia by 35 MM (13/8) long. Grinding is carried out with the end face of the grinder moving from the base of the knife section to the points.

It is possible to re-sharpen the knives in place. Position the cutterbar on or parallel to the ground. Switch off the tractor engine and disconnect the con-rod. Manually position the knives so that they cover the fingers and clamp together in this position.

Sharpening with files is not recommended as the process tends to leave small burrs on the edge which when the knife is replaced, will curl under impeding the free movement of the knife and leave a blunt cutting edge.

PT5 09/10

Maintenance Section 5-4

© 2010 Alamo Group Inc.

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Contents PT5 To the Owner/Operator/Dealer Page Bush Hog Division is willing to provide Table of Contents Maintenance Section Safety Section Safety PT5 09/10 Safety Section Safety Safety Safety Safety SGM-06 Stop Mowing if Passersby are Within 300 Feet Unless Wait a minute...Save a life See Your Bush HOG Dealer Decal Location QTY Type Description Decal Description Safety Safety Safety Federal Laws and Regulations Introduction Section Introduction Introduction Before Operating this Machine Assembly Section Ballast Weight Tractor SelectionAttachment to Tractor Coupling UP Hydraulics Removal from the TractorStorage Page Operation Section Operation Operation Operator Requirements Personal Protective Equipment PPETractor Requirements Rops and Seat BeltOperator Thrown Object Protection Tractor Horsepower Tractor Lighting and SMV Emblem3-Point Hitch Front End Weight Power Take Off PTOHydraulics Getting on and OFF the Tractor Boarding the TractorDismounting the Tractor Starting the Tractor Operation Connecting the Implement to Tractor PRE-OPERATION Inspection and ServiceTractor Pre-Operation Inspection/Service Boom Unit Pre-Operation Inspection and Service Frame Assembly OPS-B- 0023G Operation Do not Operate an Unsafe Tractor or Mower Do not Operate an Unsafe Tractor or Implement Operating the Implement Machine ControlsArm Controls Unclogging Cutterbar, Checks or Adjustments Forward SpeedHighway Working BreakawayDriving the Tractor and Implement Starting the Tractor Brake and Differential Lock Setting Driving the Tractor and Boom Operating the Tractor and Implement Foreign Debris Hazards/Overhead Obstructions Operating Speed and Ground SpeedOperating the Attached Head TRACTOR, BOOM, and Attached Head Storage Shutting Down the ImplementDisconnecting the Implement Transporting the Tractor and ImplementTransporting on Public Roadways Operation Operation Hauling the Tractor and Implement Troubleshooting Guide Page Maintenance Section Lubrication FastenersAdjusting the Knife Guides CutterbarSharpening the Knife Ram Seal Replacement- General Information Filtration MaintenanceHydraulic Rams To Change Seals on Angle, Reach and 40 MM Dia Lift RamControl Valve Non Return ValveHose Replacement Hydraulic HosesReplacing Spool O Rings Main Relief ValveHose Warranty Hose Connections StorageProper Torque Values for Fasteners Maintenance Limited Warranty To the OWNER/OPERATOR/DEALER PT5 Powertrim Sickle BAR Boom Mower