8999153EN: v1.0 18/12/2020
32
Original instructions (ENGLISH)
Website: www.spearheadmachinery.com
The shear bolt is located at the machine end of the P.T.O. shaft. The following procedure should be followed
when replacing or inspecting the shear bolt.
Disengage the P.T.O.
Raise the machine on the lift arms and move to an area with a firm, level surface.
Lower the machine and stop the tractor.
Apply the parking brake, and remove the starter key.
Release the guard restraining chains and disconnect the P.T.O. shaft from the tractor end first, and
then from the machine. This will give access to the shear bolt for inspection and replacement.
Inspect the machine, shaft and ground for possible causes of failure. Check that the blade rotates
freely and does not foul on the body.
Remove any bolt remains from the universal joint, and replace the shear bolt with the correct grade of
new bolt (four spare shear bolts and nuts are fitted to the top of the A-frame). Ensure the bolt is
correctly
tightened; see ‘Torque Settings’, Section 6.14.
CAUTION!
Only use the size and grade of shear bolt as supplied by Spearhead Machinery. For further
information refer to Section 8.
Connect the shaft to the machine and then the tractor and attach the guard restraining chains.
Re-start the machine as described in Section 4.3, and check that it operates correctly.
