is filled with hydraulic oil using the sight gauge on the lefthand side of the tank.Open the guard on the front left hand side of the machineand check that the tank isolation valve is open allowing oilto flow into the pump. The valve is open when the lever isin line with the pipe.8. PREPARATION OF THE TRACTORFor good visibility down both sides of the machine whenworking and reversing, the tractor should be fitted withmirrors.The minimum PTO power required to drive a Tomahawkvaries with model as shown in Table 1.Table 1. Minimum tractor horsepowerHowever, the suitability of any particular tractor willdepend upon:a) The size and weight of the bale to be milledb) The moisture content on the material to be milledc) Bale chamber rotation speedThe machine is supplied with a PTO shaft with 13/8”diameter 6 spline yoke. The tractor should be capable ofoperating at a PTO speed of 1000 rpm.To raise and lower the conveyor the tractor will require 2double acting hydraulic valves.As the machine will be used in a static position the controldesk can be operated in either the preferred optionloading vehicle or the tractor powering the mill.An auxiliary 3 pin socket electrical connection or cigarettesocket in the loading vehicle will be required to operatethe control desk. Should a power socket not be availablethen an additional power supply cable with a 3 pin femaleconnector is available (part number EC2001) which canbe wired directly to the battery. The brown wire is to beconnected to the positive (+) battery terminal and the bluewire to the negative terminal (-).A 2nd auxiliary 3 pin socket electrical connection on thetractor will be required to operate electrical componentson the junction box (supplied with the machine). Thispower supply should have a rating exceeding 15 amps.Should the tractor power supply rating not be sufficientthen an additional power supply cable with a 3 pin femaleconnector is available (part number EC2001) which canbe wired directly to the battery. The brown wire is to beconnected to the positive (+) battery terminal and the bluewire to the negative terminal (-).8.1 Solenoid Valve, Control Desk & Junction BoxThe control desk for the solenoid valve is supplied with asuction cup attachment. This should be fitted in the cabin a suitable position that is convenient for the operatoron a smooth, clean flat dust free surface.If the power supply is connected incorrectly with thewrong polarity the control desk and junction box will notpower up and the Bluetooth connection LED will notilluminate.If the fuse on the power lead to the machine should blowit will be indicated by the red LED illuminating on the inline fuse holder.There is a 15 amp fuse fitted in the electric power supplycable to the machine to protect against electricaloverload. Under no circumstances should the electricaloverload protection be bypassed or fuses with a ratingexceeding 15 amps be used. Warranty will beinvalidated if this occurs.9. FITTING THE MACHINE ONTO THE TRACTOR9.1 Fitting The PTO ShaftHitch the machine to the tractor on the drawbar.Proceed as follows:9.1.1 Measure the distance between the annular grooveon the tractor output shaft to the annular groove on themachine input shaft.9.1.2 Measure approximately the distance between theretaining balls of each sliding yoke at either end of thePTO shaft with it fully collapsed.9.1.3 If the distance between the grooves is over 150mm(6”) more than the distance between the locking balls thenthe PTO shaft will not require shortening.If the distance is less than 150mm the PTO shaft willneed to be shortened. Calculate the difference betweenthe two measured values and add 150mm (6”). Theanswer is the amount to be removed from each half of thePTO shaft.For example:Distance measured between grooves 1100mmLength of shaft between locking balls 1200mmLength to reduce shaft by = (1200 - 1100 ) +150Length to reduce shaft by = 100 +150Length to reduce shaft by = 250 mm9.1.4 Separate the 2 halves of the PTO shaft and removethe amount calculated from each half guard and each halftube. Deburr the drive tubes after cutting. Remove theguards to facilitate cutting if required.Hitch the machine drawbar to the tractor and turn off thetractor engine. Fit the PTO shaft with the shear bolt end ofthe PTO shaft attached to the machine.Check that the lower links are at a height such that theywill not contact the PTO shaft, drawbar or hydraulic hoseswhen the tractor is turning. If they are not used regularly,it is recommended that they be removed.Gradually turn the tractor until maximum turning lock isachieved, and drive over undulating ground, checking thatthe PTO shaft does not come to within 100 mm (4 inches)of bottoming. If necessary, cut the PTO shaft to thecorrect length. With the shaft in its most extendedposition, there should not be less than half of the originaloverlap between the sliding members.It is essential to get the relationship between the tractorPTO shaft and the machine input shaft correct to give asatisfactory PTO shaft life. The correct geometry existswhen the machine is horizontal, see Figure 1.7Model Minimum Tractor PowerC12 90 kW (120 Hp)