McConnel PA 48 Operator's Manual page 23

* At this point check that the welded in pins between the jaws of the yoke are tightly against
the top of the mounting rail - If the welded in pins are not in contact with the rail the machine
must be lowered to the ground, the next hole on the yoke top link lug selected,the machine
raised again and contact checked. Repeat again in the third hole if necessary. On subsequent
fitting to the same tractor the hole selected is always used.
Secure the yoke with the locking pins and spring cotters provided ensuring that they engage in
matching holes in the mounting rails.
Lower the quadrant lever so that the machines weight is taken by the yoke - Adjust the top link
to bring the pillar upright.
* Reposition the eccentric collars in the holes immediately behind the yoke and adjust until
both collars each side abut against the face of the yoke plates. Tighten in position.These
collars act as stops for the yoke during subsequent fitting to the same tractor.lf the tractor
used is changed new collar positions will need to be worked out following the previous
procedure.
WARNING
The quadrant lever or machine controls must be operated from the tractor seat. During
this operation ensure no one is standing on or amongst the linkage arms or bars.
* Measure the PTO drive shaft length as shown in the diagram below and subtract 2 inches
(50mm).
* This measurement which is the fully closed final length of the PTO drive shaft measured
button to button should be taken carefully before the PTO drive shaft and guards are
shortened to suit by cutting off both the driving and driven members of the tube by an equal
amount. Accurate measurement is important on some close-coupled tractors to ensure
maximum engagement during operation.
Fit the P.T.O. shaft in position - ensure that the collar locking devices on the P.T.O, shaft are
-
fully engaged and wrap the torque chain around any convenient point to prevent the shaft
guard from rotating.
Check that the rotor control valve is in the stop position (T.i. models only).
* For electric controlled machines only engage the P.T.O. (see page 18) and select "Lift down"
until the lift ramrod together with its pin can be re-assembled in position. Simïlarly selecting
"Reach out" and "Angle down" will enable the respective ram rods and pins to be replaced.
Carry out final adjustment of the tractor lift arm-leveling box to bring the main frame horizontal.
This should be checked with the arms at approximately half reach with the flail head clear of
the ground.
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